NEET Full-Length Mock Test 19

NEET Mock Test - 2026

Test 19

Number Of Questions: 180

Time: 3 hours

Correct answer Carries: 4.

Wrong Answer Carries: -1.

3:00:00

Physics

A coil of 300 turns rotates at 70 rad/s in a 0.07 T field. If the area is 0.012 m², what is the maximum emf?

\( \varepsilon_0 = N B A \omega = 300 \times 0.07 \times 0.012 \times 70 = 17.64 \, \text{V} \).

16 V
16.5 V
17 V
17.64 V
4

A transformer has \( N_p = 250 \), \( N_s = 500 \). If \( V_s = 440 \, \text{V} \) (rms), what is the primary voltage?

\( \frac{V_s}{V_p} = \frac{N_s}{N_p} \).

\( V_p = V_s \times \frac{N_p}{N_s} = 440 \times \frac{250}{500} = 220 \, \text{V} \).

200 V
210 V
230 V
220 V
4

What happens to the volume of an ideal gas if its pressure is doubled while the temperature remains constant?

According to Boyle’s Law (Section 10.4), for an ideal gas at constant temperature, \( P V = \text{constant} \). If pressure doubles (\( P_2 = 2P_1 \)), then \( V_2 = V_1 / 2 \), so the volume halves.

It doubles
It halves
It remains the same
It triples
1

A spring of \( k = 250 \, \text{N/m} \) has a \( 2.5 \, \text{kg} \) mass. If \( E = 1.25 \, \text{J} \), what is the amplitude?

Total energy: \( E = \frac{1}{2} k A^2 \).

\( 1.25 = 0.5 \times 250 \times A^2 \Rightarrow 1.25 = 125 A^2 \Rightarrow A^2 = 0.01 \Rightarrow A = 0.1 \, \text{m} \).

0.05 m
0.08 m
0.1 m
0.12 m
3

A \( 1 \, \text{kg} \) pendulum bob completes a vertical circle of radius \( 2.2 \, \text{m} \). What is the speed at the bottom? (Take \( g = 10 \, \text{m/s}^2 \))

At top, \( v_C = \sqrt{gL} \), energy conservation: \( \frac{1}{2} m v_0^2 = \frac{1}{2} m (gL) + 2mgL \).

\( v_0^2 = 5gL = 5 \times 10 \times 2.2 = 110 \Rightarrow v_0 = \sqrt{110} \approx 10.49 \, \text{m/s} \).

10 m/s
10.5 m/s
11 m/s
11.5 m/s
2

A double convex lens of refractive index \( 1.55 \) has radii of curvature \( 22 \, \text{cm} \) and \( -22 \, \text{cm} \). What is its focal length?

Lens maker’s formula: \( \frac{1}{f} = (n - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \).

\( n = 1.55 \), \( R_1 = 22 \, \text{cm} \), \( R_2 = -22 \, \text{cm} \).

\( \frac{1}{f} = (1.55 - 1) \left( \frac{1}{22} - \frac{1}{-22} \right) = 0.55 \left( \frac{1}{22} + \frac{1}{22} \right) = 0.55 \times \frac{2}{22} = \frac{1.1}{22} = \frac{1}{20} \).

\( f = 20 \, \text{cm} \).

18 cm
20 cm
25 cm
30 cm
2

What is the primary source of energy for photoelectrons in the photoelectric effect?

In the photoelectric effect, photoelectrons gain energy from incident light photons, which transfer their energy to the electrons.

Heat energy
Light energy
Electric field
Magnetic field
1

A magnetic dipole in a uniform field is in unstable equilibrium when:

The potential energy \( U = -m B \cos\theta \) is maximized when \( \theta = 180^\circ \) (anti-parallel), making it an unstable equilibrium position. Any small perturbation causes the dipole to rotate toward the stable position (\( \theta = 0^\circ \)), as the energy decreases in that direction.

It is perpendicular to the field
It is parallel to the field
It is anti-parallel to the field
The field strength is zero
3

Which of the following cannot produce electromagnetic waves?

Electromagnetic waves are produced by accelerated charges. Stationary charges produce only electrostatic fields, not time-varying fields required for EM waves.

An oscillating charge
A charge moving with uniform velocity
A charge undergoing acceleration
A charge in circular motion
2

What is the orbital period of an electron in the \( n = 4 \) orbit if \( v_1 = 2.2 \times 10^6 \, \text{m/s} \) and \( r_1 = 5.3 \times 10^{-11} \, \text{m} \)?

\( v_4 = \frac{2.2 \times 10^6}{4} = 5.5 \times 10^5 \, \text{m/s} \).

\( r_4 = 16 \times 5.3 \times 10^{-11} = 8.48 \times 10^{-10} \, \text{m} \).

\( T = \frac{2\pi r_4}{v_4} = \frac{2 \times 3.14 \times 8.48 \times 10^{-10}}{5.5 \times 10^5} \approx 9.68 \times 10^{-15} \, \text{s} \).

\( 1.21 \times 10^{-15} \, \text{s} \)
\( 4.09 \times 10^{-15} \, \text{s} \)
\( 6.05 \times 10^{-16} \, \text{s} \)
\( 9.68 \times 10^{-15} \, \text{s} \)
4

A bubble of radius \( 5.5 \, \text{mm} \) is blown at \( 45 \, \text{cm} \) depth in water (\( \rho = 1000 \, \text{kg/m}^3 \), \( S = 0.0727 \, \text{N/m} \)). What is the total pressure inside? (Take \( P_a = 1.01 \times 10^5 \, \text{Pa} \), \( g = 10 \, \text{m/s}^2 \))

\( P_i = P_a + \rho g h + \frac{2 S}{r} \).

\( P_a = 1.01 \times 10^5 \, \text{Pa} \), \( \rho g h = 1000 \times 10 \times 0.45 = 4500 \, \text{Pa} \).

\( \frac{2 S}{r} = \frac{2 \times 0.0727}{5.5 \times 10^{-3}} = 26.44 \, \text{Pa} \).

\( P_i = 1.01 \times 10^5 + 4500 + 26.44 = 1.05526 \times 10^5 \, \text{Pa} \).

1.04 × 10⁵ Pa
1.05 × 10⁵ Pa
1.055 × 10⁵ Pa
1.06 × 10⁵ Pa
3

A ball is thrown vertically upwards with an initial speed of \( 28 \, \text{m/s} \). What is the total time of flight? (Take \( g = 10 \, \text{m/s}^2 \))

Time to max height: \( v = v_0 + a t \), \( 0 = 28 - 10 t \Rightarrow t = 2.8 \, \text{s} \).

Total time = time up + time down = \( 2.8 \, \text{s} + 2.8 \, \text{s} = 5.6 \, \text{s} \).

The total time is \( 5.6 \, \text{s} \).

5.6 s
2.8 s
4 s
6 s
1

A solenoid produces \( B = 1.2 \, \text{T} \) with a core of \( \mu_r = 400 \) and \( n = 1500 \, \text{m}^{-1} \). What is the current \( I \)? (Take \( \mu_0 = 4\pi \times 10^{-7} \, \text{T m A}^{-1} \)).

\( B = \mu_0 \mu_r n I \), so \( I = \frac{B}{\mu_0 \mu_r n} \).

Given: \( B = 1.2 \, \text{T} \), \( \mu_r = 400 \), \( n = 1500 \, \text{m}^{-1} \), \( \mu_0 = 4\pi \times 10^{-7} \).

\( I = \frac{1.2}{4\pi \times 10^{-7} \times 400 \times 1500} = \frac{1.2}{7.539 \times 10^{-1}} \approx 1.592 \, \text{A} \approx 1.6 \, \text{A} \).

1.4 A
1.5 A
1.6 A
1.7 A
3

What is the energy equivalent of \( 0.05 \, \text{g} \) of matter in Joules? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

\( E = m c^2 \).

\( m = 0.05 \times 10^{-3} \, \text{kg} = 5 \times 10^{-5} \, \text{kg} \), \( c^2 = 9 \times 10^{16} \, \text{m}^2/\text{s}^2 \).

\( E = 5 \times 10^{-5} \times 9 \times 10^{16} = 4.5 \times 10^{12} \, \text{J} \).

4.0 × 10¹² J
4.5 × 10¹² J
5.0 × 10¹² J
5.5 × 10¹² J
2

A truck moving at \( 15 \, \text{m/s} \) decelerates uniformly and stops after \( 30 \, \text{m} \). How long does it take to stop?

Use \( v^2 = v_0^2 + 2 a x \) to find \( a \): \( 0 = (15)^2 + 2 a (30) \Rightarrow 0 = 225 + 60 a \Rightarrow a = -3.75 \, \text{m/s}^2 \).

Then, \( v = v_0 + a t \): \( 0 = 15 - 3.75 t \Rightarrow t = \frac{15}{3.75} = 4 \, \text{s} \).

The time taken is \( 4 \, \text{s} \).

2 s
6 s
4 s
8 s
3

What is the physical significance of the temperature coefficient of resistivity being positive for metals?

A positive temperature coefficient (\( \alpha \)) means resistivity (\( \rho_t = \rho_0 [1 + \alpha (T - T_0)] \)) increases with temperature, as increased lattice vibrations reduce the mean free time between collisions, raising resistance.

Resistance decreases with temperature
Conductivity increases
Resistance increases with temperature
Charge carriers multiply
3

What is the condition for total internal reflection to occur?

Total internal reflection occurs when the angle of incidence exceeds the critical angle, and light travels from a denser to a rarer medium.

Angle of incidence < Critical angle
Angle of incidence = 90°
Light travels from rarer to denser medium
Angle of incidence > Critical angle
4

An electron is accelerated through \( 50 \, \text{V} \). What is its de Broglie wavelength? (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \), \( m_e = 9.11 \times 10^{-31} \, \text{kg} \), \( e = 1.6 \times 10^{-19} \, \text{C} \))

\( K = e V = 1.6 \times 10^{-19} \times 50 = 8.0 \times 10^{-18} \, \text{J} \).

\( p = \sqrt{2 m K} = \sqrt{2 \times 9.11 \times 10^{-31} \times 8.0 \times 10^{-18}} \approx 3.816 \times 10^{-24} \, \text{kg m/s} \).

\( \lambda = \frac{h}{p} = \frac{6.63 \times 10^{-34}}{3.816 \times 10^{-24}} \approx 1.737 \times 10^{-10} \, \text{m} = 0.1737 \, \text{nm} \).

0.1737 nm
0.18 nm
0.2 nm
0.22 nm
1

A conductor has a surface charge density of \( 1.5 \times 10^{-6} \, \text{C/m}^2 \). What is the electric field just outside it? (Take \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2 \text{N}^{-1} \text{m}^{-2} \)).

\( E = \frac{\sigma}{\varepsilon_0} = \frac{1.5 \times 10^{-6}}{8.85 \times 10^{-12}} \approx 1.695 \times 10^5 \, \text{N/C} \).

1.5 × 10⁵ N/C
1.695 × 10⁵ N/C
1.8 × 10⁵ N/C
2 × 10⁵ N/C
2

What is the primary reason a battery’s terminal voltage is less than its emf when supplying current?

Terminal voltage \( V = \varepsilon - I r \). When current flows, the voltage drop across the internal resistance (\( I r \)) reduces the voltage available at the terminals below the emf (\( \varepsilon \)).

Voltage drop across internal resistance
Decrease in emf
Increase in external resistance
Loss of charge carriers
1

In an isolated system of two capacitors initially charged and then connected in parallel with opposite polarities, what happens to the final energy of the system compared to the initial energy?

When two capacitors are connected in parallel with opposite polarities, charges redistribute such that the net charge on the positive plates (and negative plates) adjusts to a new equilibrium. The initial energy stored in the capacitors (\( U_i = \frac{1}{2} C_1 V_1^2 + \frac{1}{2} C_2 V_2^2 \)) is greater than the final energy after connection due to energy losses during charge redistribution. Some energy is lost as heat or electromagnetic radiation during the transient current flow, so the final energy is less than the initial energy.

Final energy is less than initial energy due to heat loss
Final energy equals initial energy as charge is conserved
Final energy is greater due to increased potential
Final energy becomes zero as charges cancel out
1

Three charges \( +q, +q, -q \) are at the vertices of an equilateral triangle of side 3 m. What is the net force magnitude on \( +q \) at one vertex?

Force between \( +q \) and \( +q \): \( F = \frac{k q^2}{(3)^2} = \frac{k q^2}{9} \) (repulsive).

Force between \( +q \) and \( -q \): \( F = \frac{k q^2}{9} \) (attractive).

Angle between forces is 60°. Resultant: \( F_{\text{net}} = \sqrt{F^2 + F^2 + 2F^2 \cos 60^\circ} = \sqrt{3} F = \frac{\sqrt{3} k q^2}{9} \).

\( \frac{k q^2}{9} \)
\( \frac{\sqrt{3} k q^2}{9} \)
\( \frac{2 k q^2}{9} \)
\( \frac{k q^2}{3} \)
2

Why does the reflected wavefront from a plane surface maintain the same angle as the incident wavefront?

The wave model shows that secondary wavelets from the surface form a reflected wavefront where the angle of incidence equals the angle of reflection due to geometric symmetry.

Frequency doubles
Amplitude decreases
Geometric symmetry of wavelets
Wavelength changes
3

A \( 1700 \, \text{kg} \) truck accelerates at \( 1.5 \, \text{m/s}^2 \) for \( 4 \, \text{s} \), then a \( 1.8 \, \text{kg} \) stone is dropped. What is the horizontal distance traveled by the stone in \( 2.5 \, \text{s} \)? (Neglect air resistance)

Truck’s velocity after \( 4 \, \text{s} \): \( v = u + at = 0 + 1.5 \times 4 = 6 \, \text{m/s} \).

Stone inherits this horizontal velocity upon drop.

No horizontal forces act after drop (air resistance neglected).

Distance: \( s = v \times t = 6 \times 2.5 = 15 \, \text{m} \).

12 m
15 m
18 m
20 m
2

The forward bias current in a diode is typically measured in:

In forward bias, the current due to majority carrier diffusion is large, typically in the milliampere (mA) range, requiring a milliammeter for measurement.

Microampere (\( \mu \text{A} \))
Nanoampere (nA)
Milliampere (mA)
Ampere (A)
3

An object is at a depth of \( 19.95 \, \text{cm} \) in a medium with refractive index \( 1.5 \). What is the apparent depth?

Apparent depth = \( \frac{\text{real depth}}{n} \).

Real depth = \( 19.95 \, \text{cm} \), \( n = 1.5 \).

Apparent depth = \( \frac{19.95}{1.5} = 13.3 \, \text{cm} \).

13.3 cm
15 cm
20 cm
25 cm
1

What causes the resistivity of a conductor to deviate from Ohm’s law at very high electric fields?

At high fields, resistivity (\( \rho = m / (n e^2 \tau) \)) may change as \( \tau \) or \( n \) varies (e.g., due to electron saturation or heating), making the \( I \)-versus-\( V \) relationship non-linear and violating Ohm’s law.

Current stops flowing
Voltage becomes zero
Resistivity becomes field-dependent
Charge carriers vanish
3

Which of the following is a trivalent dopant used in p-type semiconductors?

Trivalent dopants (valency 3) like Boron (B), Aluminium (Al), and Indium (In) are used in p-type semiconductors to create holes. Phosphorus (P) is pentavalent.

Phosphorus
Aluminium
Arsenic
Antimony
2

A gas occupies 5.6 litres at STP. How many moles of the gas are present? (Molar volume at STP = 22.4 litres)

Number of moles (\(\mu\)) = \(\frac{\text{Volume}}{\text{Molar volume}}\).

\(\mu = \frac{5.6}{22.4} = 0.25 \, \text{mol}\).

0.15 mol
0.25 mol
0.50 mol
1.00 mol
2

A ball is thrown horizontally at \( 6 \, \text{m/s} \) from a height of \( 4.9 \, \text{m} \). What is its horizontal range? (Take \( g = 9.8 \, \text{m/s}^2 \))

Time to fall: \( h = \frac{1}{2} g t^2 \Rightarrow 4.9 = \frac{1}{2} \times 9.8 \times t^2 \Rightarrow 4.9 = 4.9 t^2 \Rightarrow t^2 = 1 \Rightarrow t = 1 \, \text{s} \).

Horizontal range \( R = v_x t = 6 \times 1 = 6 \, \text{m} \).

3 m
9 m
12 m
6 m
4

A square loop of side 26 cm rotates at 12 rad/s in a 0.3 T field. What is the maximum emf induced?

\( A = (0.26)^2 = 0.0676 \, \text{m}^2 \).

\( \varepsilon_0 = N B A \omega = 1 \times 0.3 \times 0.0676 \times 12 = 0.24336 \, \text{V} \approx 0.243 \, \text{V} \).

0.2 V
0.243 V
0.28 V
0.3 V
2

An aluminium block of dimensions \( 0.3 \, \text{m} \times 0.2 \, \text{m} \times 0.05 \, \text{m} \) is subjected to a shearing force of \( 1.5 \times 10^4 \, \text{N} \). If the shear modulus of aluminium is \( 2.5 \times 10^{10} \, \text{N/m}^2 \), what is the shear strain?

Shear modulus: \( G = \frac{\text{Shear stress}}{\text{Shear strain}} \).

Shear stress: \( \text{Shear stress} = \frac{F}{A} \), \( A = 0.3 \times 0.2 = 0.06 \, \text{m}^2 \).

Shear stress: \( \frac{1.5 \times 10^4}{0.06} = 2.5 \times 10^5 \, \text{N/m}^2 \).

Shear strain: \( \text{Shear strain} = \frac{\text{Shear stress}}{G} = \frac{2.5 \times 10^5}{2.5 \times 10^{10}} = 1 \times 10^{-5} \).

\( 5 \times 10^{-6} \)
\( 1.5 \times 10^{-5} \)
\( 2 \times 10^{-5} \)
\( 1 \times 10^{-5} \)
4

A moon orbits a planet with a period of 7 days and radius \( 5 \times 10^8 \, \text{m} \). What is the planet’s mass? (\( G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2, 1 \, \text{day} = 86400 \, \text{s} \))

\( M = \frac{4\pi^2 r^3}{G T^2} \).

\( T = 7 \times 86400 = 6.048 \times 10^5 \, \text{s} \).

\( T^2 = 3.658 \times 10^{11} \, \text{s}^2 \).

\( r^3 = (5 \times 10^8)^3 = 1.25 \times 10^{25} \, \text{m}^3 \).

\( M = \frac{4 \times (3.14)^2 \times 1.25 \times 10^{25}}{6.67 \times 10^{-11} \times 3.658 \times 10^{11}} \).

\( M = \frac{4.93 \times 10^{25}}{2.44 \times 10^1} \approx 2.02 \times 10^{24} \, \text{kg} \).

1.9 × 10²⁴ kg
2.0 × 10²⁴ kg
2.1 × 10²⁴ kg
2.2 × 10²⁴ kg
2

A force of \( 10 \, \text{N} \) acts on a body of mass \( 2 \, \text{kg} \) initially at rest. What is the velocity of the body after \( 5 \, \text{s} \)?

First, calculate acceleration using Newton’s Second Law: \( a = \frac{F}{m} \).

Substitute: \( F = 10 \, \text{N} \), \( m = 2 \, \text{kg} \).

So, \( a = \frac{10}{2} = 5 \, \text{m/s}^2 \).

Use the equation \( v = u + at \), where initial velocity \( u = 0 \), \( t = 5 \, \text{s} \).

Substitute: \( v = 0 + 5 \times 5 = 25 \, \text{m/s} \).

10 m/s
15 m/s
20 m/s
25 m/s
4

A uniform rod of mass \( 5 \, \text{kg} \) and length \( 2 \, \text{m} \) is pivoted at its center. What is its moment of inertia about the pivot?

For a rod pivoted at its center: \( I = \frac{1}{12} M L^2 \).

\( M = 5 \, \text{kg} \), \( L = 2 \, \text{m} \).

\( I = \frac{1}{12} \times 5 \times (2)^2 = \frac{20}{12} = \frac{5}{3} \approx 1.67 \, \text{kg m}^2 \).

1.5 kg m²
1.67 kg m²
2.0 kg m²
2.5 kg m²
2

What is the phase change when a longitudinal wave reflects off a rigid boundary?

For a longitudinal wave, a rigid boundary (fixed end) causes a compression to reflect as a compression, resulting in no phase change (0 radians), unlike transverse waves which invert.

\( \pi/2 \) radians
\( \pi \) radians
\( 2\pi \) radians
0 radians
4

The work done \( W \) depends on force \( F \) and displacement \( s \) as \( W = k F^a s^b \). Given \( [W] = [M L^2 T^{-2}] \), find \( a \) and \( b \).

\( [F] = [M L T^{-2}] \), \( [s] = [L] \).

\( [M L^2 T^{-2}] = [M L T^{-2}]^a [L]^b = [M^a L^{a+b} T^{-2a}] \).

Equate: \( a = 1 \), \( a + b = 2 \), \( -2a = -2 \Rightarrow a = 1 \).

\( 1 + b = 2 \Rightarrow b = 1 \).

\( a = 1, b = 1 \).

a = 1, b = 1
a = -1, b = 2
a = 2, b = -1
a = 1, b = -1
1

The dimensional formula of energy density is \( [M L^{-1} T^{-2}] \). What is the dimensional formula of energy flux (energy per unit area per unit time)?

Energy flux = Energy / Area / Time.

\( [M L^2 T^{-2}] / [L^2] / [T] = [M L^2 T^{-2}] [L^{-2}] [T^{-1}] = [M T^{-3}] \).

[M L T⁻³]
[M L⁻¹ T⁻³]
[M T⁻³]
[M L² T⁻³]
3

Why can’t the gravitational force on a point mass outside a spherical shell be zero?

Outside a spherical shell, the gravitational force acts as if all the mass is concentrated at the center. Since the mass is non-zero and the distance is finite, the force (\( F = \frac{G M m}{r^2} \)) cannot be zero.

The shell has no mass
The force acts as if from the center
The shell’s thickness cancels the force
The force is repulsive
2

Which of the following has the highest energy gap?

Energy gaps: C (diamond) = 5.4 eV, Si = 1.1 eV, Ge = 0.7 eV, Sn = 0 eV (metal). Carbon has the highest energy gap among these, making it an insulator.

Si
Ge
Sn
C
4

A wire of length \( 2.2 \, \text{m} \) carrying \( 3.5 \, \text{A} \) is at \( 60^\circ \) to a magnetic field of \( 0.2 \, \text{T} \). What is the force on the wire?

Force \( F = I l B \sin \theta \).

\( F = 3.5 \times 2.2 \times 0.2 \times \sin 60^\circ = 7.7 \times 0.2 \times 0.866 = 1.3336 \approx 1.33 \, \text{N} \).

0.77 N
1.33 N
2.66 N
1.54 N
2

Three particles of masses \( 2 \, \text{kg} \), \( 4 \, \text{kg} \), and \( 6 \, \text{kg} \) are at \( (0, 2) \), \( (3, 0) \), and \( (1, 4) \) respectively. What is the x-coordinate of their center of mass?

Formula: \( X = \frac{m_1 x_1 + m_2 x_2 + m_3 x_3}{m_1 + m_2 + m_3} \).

Masses: \( 2, 4, 6 \, \text{kg} \); x-coordinates: \( 0, 3, 1 \).

\( X = \frac{(2 \times 0) + (4 \times 3) + (6 \times 1)}{2 + 4 + 6} = \frac{0 + 12 + 6}{12} = \frac{18}{12} = 1.5 \, \text{m} \).

1.2 m
1.5 m
1.8 m
2.0 m
2

An electron moves at \( 6.5 \times 10^6 \, \text{m/s} \) perpendicular to a field of \( 0.2 \, \text{T} \). What is the radius of its path? (Mass = \( 9.1 \times 10^{-31} \, \text{kg} \), charge = \( 1.6 \times 10^{-19} \, \text{C} \))

\( r = \frac{mv}{qB} \).

\( r = \frac{9.1 \times 10^{-31} \times 6.5 \times 10^6}{1.6 \times 10^{-19} \times 0.2} = \frac{5.915 \times 10^{-24}}{3.2 \times 10^{-20}} = 1.848 \times 10^{-4} \, \text{m} \approx 0.0185 \, \text{cm} \).

0.0092 cm
0.0370 cm
0.0185 cm
0.0278 cm
3

A \( 6 \, \text{kg} \) mass at \( 10 \, \text{m/s} \) collides elastically with an identical stationary mass. What is the speed of the second mass after collision?

For equal masses in elastic collision, \( v_{2f} = v_{1i} = 10 \, \text{m/s} \).

8 m/s
9 m/s
10 m/s
11 m/s
3

What is the change in internal energy for \( 0.5 \, \text{moles} \) of an ideal gas heated from \( 260 \, \text{K} \) to \( 310 \, \text{K} \) at constant volume? (\( C_v = 20.8 \, \text{J mol}^{-1} \text{K}^{-1} \))

\( \Delta U = \mu C_v \Delta T \).

\( \mu = 0.5 \), \( C_v = 20.8 \), \( \Delta T = 310 - 260 = 50 \).

\( \Delta U = 0.5 \times 20.8 \times 50 = 520 \, \text{J} \).

480 J
520 J
550 J
600 J
2

Chemistry

Why is carbon tetrachloride not used as a solvent for polar substances?

Carbon tetrachloride (\( \ce{CCl4} \)) is a non-polar solvent and does not dissolve polar substances well.

High reactivity
Non-polar nature
High boiling point
Low density
2

Which of the following is a metalloid?

Metalloids lie along the metal-non-metal boundary. Silicon (Si) exhibits properties of both metals and non-metals.

Na
Mg
Cl
Si
4

How many electrons are involved in the reduction of 1 mol of Cu²⁺ to Cu(s)?

Reaction: \( \ce{Cu^2+ + 2e- -> Cu(s)} \).

2 electrons are required per mole of Cu²⁺.

1
3
2
4
3

Which of the following compounds will not undergo hydrolysis easily?

Aryl halides resist hydrolysis due to partial double bond character in the C–X bond.

\( \ce{C6H5Cl} \)
\( \ce{CH3CH2Cl} \)
\( \ce{CH3CHClCH3} \)
\( \ce{CH3CH2CH2Br} \)
1

What is the equilibrium constant for the reaction Sn(s) + Cu²⁺(aq) → Sn²⁺(aq) + Cu(s) if \( E_{\text{cell}}^0 = 0.48 \, \text{V} \) at 298 K?

\( E_{\text{cell}}^0 = \frac{0.059}{n} \log K_c \), \( n = 2 \).

\( 0.48 = \frac{0.059}{2} \log K_c \), \( \log K_c = \frac{0.48 \times 2}{0.059} = 16.271 \).

\( K_c = 10^{16.271} \approx 1.87 \times 10^{16} \).

9.35 × 10¹⁵
1.87 × 10¹⁶
2.81 × 10¹⁶
3.74 × 10¹⁶
2

For \( \ce{N2(g) + 2O2(g) <=> 2NO2(g)} \), \( K_c = 0.01 \) at 500 K. What is \( K_c \) for the reverse reaction?

For reverse reaction \( \ce{2NO2(g) <=> N2(g) + 2O2(g)} \), \( K_c' = \frac{1}{K_c} = \frac{1}{0.01} = 100 \).

0.01
100
0.1
10
2

For the reaction \(\ce{CH4(g) + H2O(g) -> CO(g) + 3H2(g)}\), if \(\Delta H = 206 kJ/mol\) at 298 K, what is \(\Delta U\) (R = 8.314 J/mol·K)?

\(\Delta n_g = (1 + 3) - (1 + 1) = 2\), \(RT = 8.314 \times 298 / 1000 = 2.48 kJ\). \(\Delta H = \Delta U + \Delta n_g RT\). \(\Delta U = 206 - 2 \times 2.48 = 201.04 kJ/mol\).

201.04 kJ/mol
206 kJ/mol
208.48 kJ/mol
198.56 kJ/mol
1

What is the total number of sigma (\( \sigma \)) bonds in \( \ce{CH3CH2CH2NH2} \)?

In \( \ce{CH3CH2CH2NH2} \), there are 10 single bonds: 8 C-H, 2 C-C, 1 C-N, and 2 N-H. Each is a sigma bond, totaling 10.

9
10
11
8
2

In the reaction \( \ce{Fe2O3 + 3CO -> 2Fe + 3CO2} \), how many grams of CO₂ are produced from 80 g of Fe₂O₃ with excess CO? (Atomic masses: Fe = 56, O = 16, C = 12)

Molar mass of Fe₂O₃ = (2 × 56) + (3 × 16) = 160 g/mol.

Moles of Fe₂O₃ = 80 / 160 = 0.5 mol.

1 mol Fe₂O₃ produces 3 mol CO₂. Moles of CO₂ = 0.5 × 3 = 1.5 mol.

Mass = 1.5 × 44 = 66 g.

44 g
66 g
88 g
60 g
1

What is the hybridization of the carbon atom in the \( \ce{CO2} \) molecule?

In \( \ce{CO2} \), carbon forms 2 double bonds, requiring 2 hybrid orbitals, achieved by \( sp \) hybridization.

\( sp^2 \)
\( sp \)
\( sp^3 \)
\( sp^3d \)
2

Which complex shows optical isomerism?

\( \ce{[PtCl2(en)2]^{2+}} \) (cis isomer) with two bidentate \( \ce{en} \) ligands in a square planar geometry is chiral, showing optical isomerism (d and l forms).

\( \ce{[Pt(NH3)2Cl2]} \)
\( \ce{[NiCl4]^{2-}} \)
\( \ce{[Co(NH3)4Cl2]+} \)
\( \ce{[PtCl2(en)2]^{2+}} \)
4

Which of the following hydrocarbons is used as an anti-knocking agent in petrol?

Iso-octane is used as an anti-knocking agent in petrol to improve its octane rating.

Methane
Iso-octane
Benzene
Ethyne
2

In Kjeldahl’s method, which acid is used to digest the organic compound?

\( \ce{H2SO4} \) is used to digest the organic compound, converting nitrogen to \( \ce{(NH4)2SO4} \) in Kjeldahl’s method.

\( \ce{HCl} \)
\( \ce{H2SO4} \)
\( \ce{HNO3} \)
\( \ce{CH3COOH} \)
2

What is the oxidation number of Mn in \( \ce{KMnO4} \)?

K is +1, O is -2. Sum is zero: \( +1 + x + 4(-2) = 0 \), \( 1 + x - 8 = 0 \), \( x = +7 \).

+6
+7
+5
+4
2

Which of the following lanthanoids has an atomic number of 58?

Cerium (Ce, Z = 58) is the first lanthanoid after lanthanum, with \( 4f^1 5d^1 6s^2 \).

Ce
Gd
Eu
Tb
1

The atomic radius of lanthanum (La) compared to lutetium (Lu) is:

Lanthanoid contraction causes a decrease in atomic radius from La to Lu, making La’s radius larger.

Smaller
Equal
Smaller than Gd
Larger
4

Which compound is formed when anisole undergoes bromination in ethanoic acid medium?

Anisole undergoes electrophilic substitution, forming p-Bromoanisole as the major product.

o-Bromoanisole
p-Bromoanisole
2,4,6-Tribromoanisole
Methyl bromide
2

Which of the following amines has a lone pair that participates in resonance?

In aniline (\( \ce{C6H5NH2} \)), the nitrogen lone pair is delocalized into the benzene ring via resonance, unlike aliphatic amines.

\( \ce{C6H5NH2} \)
\( \ce{CH3CH2NH2} \)
\( \ce{(CH3)2NH} \)
\( \ce{(CH3)3N} \)
1

The \( K_{sp} \) of \( \ce{Hg2Cl2} \) is \( 1.3 \times 10^{-18} \). What is its solubility in water?

\( \ce{Hg2Cl2(s) <=> Hg2^2+ + 2Cl-} \), \( K_{sp} = S \cdot (2S)^2 = 4S^3 \).

\( 4S^3 = 1.3 \times 10^{-18} \), \( S^3 = 3.25 \times 10^{-19} \), \( S \approx 6.88 \times 10^{-7} \) M.

\( 1.3 \times 10^{-18} \) M
\( 6.9 \times 10^{-7} \) M
\( 3.6 \times 10^{-6} \) M
\( 8.2 \times 10^{-8} \) M
2

Calculate the energy of a photon with a frequency of \(8.0 \times 10^{14} \, \text{Hz}\). (\(h = 6.626 \times 10^{-34} \, \text{J s}\))

Energy \(E = h\nu = 6.626 \times 10^{-34} \times 8.0 \times 10^{14} = 5.3008 \times 10^{-19} \, \text{J}\).

\(4.0 \times 10^{-19} \, \text{J}\)
\(6.0 \times 10^{-19} \, \text{J}\)
\(5.3008 \times 10^{-19} \, \text{J}\)
\(3.0 \times 10^{-19} \, \text{J}\)
3

For the reaction \( \ce{2A -> 3B} \), the concentration of A decreases from 0.24 M to 0.20 M in 40 seconds. What is the average rate of formation of B in \( \ce{mol L^{-1} s^{-1}} \)?

Rate = \( -\frac{1}{2} \frac{\Delta[\ce{A}]}{\Delta t} = \frac{1}{3} \frac{\Delta[\ce{B}]}{\Delta t} \).

\( \Delta[\ce{A}] = 0.20 - 0.24 = -0.04 \, \ce{mol L^{-1}} \), \( \Delta t = 40 \, \ce{s} \).

\( -\frac{\Delta[\ce{A}]}{\Delta t} = 0.001 \), so \( \frac{\Delta[\ce{B}]}{\Delta t} = \frac{3}{2} \times 0.001 = 1.5 \times 10^{-3} \).

\( 1.5 \times 10^{-3} \)
\( 1.0 \times 10^{-3} \)
\( 2.0 \times 10^{-3} \)
\( 3.0 \times 10^{-3} \)
1

The rate constant of a reaction is \( 1.0 \times 10^{-4} \, \ce{s^{-1}} \) at 298 K and \( 3.0 \times 10^{-4} \, \ce{s^{-1}} \) at 308 K. What is the activation energy in \( \ce{kJ mol^{-1}} \)? (R = 8.314 J/mol·K)

\( \log \frac{k_2}{k_1} = \frac{E_a}{2.303R} \left( \frac{T_2 - T_1}{T_1 T_2} \right) \).

\( \log \frac{3.0 \times 10^{-4}}{1.0 \times 10^{-4}} = \log 3 = 0.477 \).

\( 0.477 = \frac{E_a}{2.303 \times 8.314} \left( \frac{10}{298 \times 308} \right) \), \( E_a \approx 55.1 \, \ce{kJ mol^{-1}} \).

48.5
55.1
61.8
68.3
2

Which ligand is weakest in the spectrochemical series among the following?

The spectrochemical series is \( \ce{I^-} < \ce{Br^-} < \ce{Cl^-} < \ce{NH3} \). \( \ce{I^-} \) is the weakest field ligand here.

\( \ce{Cl^-} \)
\( \ce{Br^-} \)
\( \ce{NH3} \)
\( \ce{I^-} \)
4

What is the major organic product when benzene undergoes Friedel-Crafts acylation with acetyl chloride?

Friedel-Crafts acylation of benzene with acetyl chloride in the presence of \( \ce{AlCl3} \) produces acetophenone.

Benzophenone
Acetophenone
Toluene
Benzaldehyde
2

Which of the following reagents is used in the Hell-Volhard-Zelinsky reaction?

In the Hell-Volhard-Zelinsky reaction, carboxylic acids with α-hydrogens react with bromine in the presence of red phosphorus to form α-bromo carboxylic acids.

Zn-Hg/HCl
PBr3 and Br2
LiAlH4
KMnO4
2

The atomic radius of elements increases down a group due to:

Adding new electron shells down a group increases the distance between the nucleus and valence electrons, increasing radius.

Decrease in nuclear charge
Increase in electronegativity
Decrease in shielding effect
Addition of new shells
4

For the reaction \(\ce{CO(g) + 2H2(g) -> CH3OH(l)}\), if \(\Delta H = -128.1 kJ/mol\) at 298 K, what is \(\Delta U\) (R = 8.314 J/mol·K)?

\(\Delta n_g = 0 - (1 + 2) = -2\), \(RT = 8.314 \times 298 / 1000 = 2.48 kJ\). \(\Delta H = \Delta U + \Delta n_g RT\). \(\Delta U = -128.1 - (-2 \times 2.48) = -123.14 kJ/mol\).

-123.14 kJ/mol
-128.1 kJ/mol
-130.58 kJ/mol
-120.66 kJ/mol
1

What is the mass percentage of a solution made by dissolving 30 g of \( \ce{K2SO4} \) in 170 g of water?

Total mass of solution = 30 g + 170 g = 200 g.

Mass % = \( \frac{\text{Mass of K2SO4}}{\text{Total mass}} \times 100 = \frac{30}{200} \times 100 = 15\% \).

15%
17.65%
12.5%
20%
1

What is the formal charge on the carbon atom in the \( \ce{CO} \) molecule?

In \( \ce{CO} \), carbon has 1 triple bond (6 electrons) and 1 lone pair (2 electrons). Formal charge = 4 - 2 - \( \frac{1}{2} \times 6 \) = -1.

0
-1
+1
-2
2

The maximum oxidation state of chromium (Cr, Z = 24) corresponds to its:

Cr in Group 6 has a maximum oxidation state of +6 (e.g., \( \ce{CrO4^{2-}} \)), equal to its group number.

Atomic number
Period number
d electron count
Group number
4

What is the bond angle around the nitrogen atom in \( \ce{CH3NH2} \)?

The nitrogen in \( \ce{CH3NH2} \) is \( sp^3 \) hybridized (3 bonds, 1 lone pair), resulting in a tetrahedral electron geometry, but a bond angle of approximately 107° due to lone pair repulsion.

120°
180°
109.5°
107°
4

What is the pH of a solution with \( [\ce{H+}] = 3.2 \times 10^{-3} \) M?

\( \text{pH} = -\log(3.2 \times 10^{-3}) \approx 2.5 \).

3.0
2.0
3.2
2.5
4

Which of the following compounds undergoes the Haloform reaction?

The Haloform reaction occurs in compounds containing the \(\ce{-COCH3}\) group, such as acetophenone.

Benzaldehyde
Acetophenone
Benzoic acid
Formic acid
2

Which complex shows ionization isomerism with \( \ce{[Co(NH3)5NO2]Cl2} \)?

\( \ce{[Co(NH3)5Cl]NO2Cl} \) swaps \( \ce{Cl^-} \) and \( \ce{NO2^-} \) with \( \ce{[Co(NH3)5NO2]Cl2} \), exhibiting ionization isomerism.

\( \ce{[Co(NH3)6]Cl3} \)
\( \ce{[Co(NH3)5Br]SO4} \)
\( \ce{[Co(NH3)5SO4]Cl} \)
\( \ce{[Co(NH3)5Cl]NO2Cl} \)
4

Which of the following does not undergo Aldol condensation?

Benzaldehyde does not undergo Aldol condensation because it lacks α-hydrogen atoms.

Acetaldehyde
Acetone
Benzaldehyde
Propanal
3

A reaction has the rate law \( \ce{Rate = k[A][B]^0} \). If [A] is increased by a factor of 4, what happens to the rate?

Rate = \( k[\ce{A}] \), new rate = \( k(4[\ce{A}]) = 4k[\ce{A}] \).

Rate increases by a factor of 4.

Increases 4 times
Increases 2 times
Remains unchanged
Increases 8 times
1

What is the mass percentage of a solution formed by mixing 120 g of a 20% (w/w) solution with 180 g of a 10% (w/w) solution?

Mass of solute from first = \( 0.20 \times 120 = 24 \, \text{g} \).

Mass of solute from second = \( 0.10 \times 180 = 18 \, \text{g} \).

Total solute = 24 + 18 = 42 g.

Total mass = 120 + 180 = 300 g.

Mass % = \( \frac{42}{300} \times 100 = 14\% \).

12%
15%
16%
14%
4

Calculate the wavelength of radiation with a frequency of \(4.0 \times 10^{14} \, \text{Hz}\). (\(c = 3.0 \times 10^8 \, \text{m s}^{-1}\))

Wavelength \(\lambda = \frac{c}{\nu} = \frac{3.0 \times 10^8}{4.0 \times 10^{14}} = 7.5 \times 10^{-7} \, \text{m} = 750 \, \text{nm}\).

\(600 \, \text{nm}\)
\(750 \, \text{nm}\)
\(500 \, \text{nm}\)
\(800 \, \text{nm}\)
2

For an exothermic reaction at constant pressure, what is the relationship between \(\Delta H\) and \(\Delta U\)?

For an exothermic reaction, \(\Delta H < 0\). If \(\Delta n_g < 0\) (fewer gas moles in products), \(\Delta H < \Delta U\) because \(\Delta H = \Delta U + \Delta n_g RT\) and \(\Delta n_g RT < 0\).

\(\Delta H = \Delta U\)
\(\Delta H < \Delta U\) if \(\Delta n_g < 0\)
\(\Delta H > \Delta U\) if \(\Delta n_g < 0\)
\(\Delta H > \Delta U\) if \(\Delta n_g > 0\)
2

How many grams of O₂ are required to react with 14 g of N₂ to form N₂O₅? (Atomic masses: N = 14, O = 16)

Reaction: \( \ce{2N2 + 5O2 -> 2N2O5} \).

Moles of N₂ = 14 / 28 = 0.5 mol.

2 mol N₂ require 5 mol O₂. Moles of O₂ = (5 / 2) × 0.5 = 1.25 mol.

Mass = 1.25 × 32 = 40 g.

32 g
40 g
48 g
56 g
2

Which molecule has a central atom with an expanded octet exceeding eight electrons?

In \( \ce{PF5} \), phosphorus has 10 electrons around it (5 bonds), exceeding the octet due to available 3d orbitals.

\( \ce{PF5} \)
\( \ce{BF3} \)
\( \ce{NH3} \)
\( \ce{BeH2} \)
1

The deficiency of which vitamin causes scurvy?

Vitamin C (ascorbic acid) deficiency leads to scurvy, characterized by bleeding gums, due to its role in collagen synthesis.

Vitamin B1
Vitamin D
Vitamin C
Vitamin E
3

How many grams of NH₃ are produced from 7 g of N₂ in the reaction \( \ce{N2 + 3H2 -> 2NH3} \) with excess H₂? (Atomic masses: N = 14, H = 1)

Moles of N₂ = 7 / 28 = 0.25 mol.

1 mol N₂ produces 2 mol NH₃. Moles of NH₃ = 0.25 × 2 = 0.5 mol.

Molar mass of NH₃ = 17 g/mol. Mass = 0.5 × 17 = 8.5 g.

7 g
8 g
8.5 g
9 g
3

What is the maximum number of hydrogen bonds that one molecule of \( \ce{CH3NH2} \) can form with water?

Methylamine (\( \ce{CH3NH2} \)) has two N-H bonds (each donating one H-bond) and one lone pair (accepting one H-bond), allowing a maximum of three hydrogen bonds with water.

2
3
1
4
1

What is the major product of Friedel-Crafts alkylation of anisole with ethyl chloride?

The ethyl group gets attached at the ortho and para positions due to the +M effect of the -OCH3 group.

o-Ethylanisole
p-Ethylanisole
m-Ethylanisole
Both o- and p-Ethylanisole
4

Botany

What is the term for stamens attached to the petals?

Polyandrous
Epiphyllous
Epipetalous
Monadelphous
3

When stamens are attached to the petals, they are called epipetalous, as seen in brinjal.

Which of the following statements about molecular taxonomy is correct?

Molecular taxonomy classifies organisms based on genetic material.
It only relies on physical characteristics.
It ignores evolutionary relationships.
It is not useful for identifying microorganisms.
1

Molecular taxonomy classifies organisms by comparing DNA, RNA, and protein sequences, revealing evolutionary relationships.

Which plant growth regulator is known to promote female flowers in cucumbers, increasing yield?

Auxin
Cytokinin
Ethylene
Gibberellin
3

Ethylene promotes the formation of female flowers in cucumbers, thereby increasing yield.

Which of the following statements about lichens is correct?

Lichens are formed by a symbiotic association of fungi and algae.
Lichens grow well in highly polluted environments.
Lichens cannot survive in extreme conditions.
Fungi in lichens perform photosynthesis.
1

Lichens are formed by a symbiotic association between fungi and algae, where algae perform photosynthesis.

Which of the following statements about ecosystem services is incorrect?

Ecosystem services include climate regulation and water purification.
Ecosystem services provide economic benefits to humans.
Ecosystem services are not influenced by biodiversity loss.
Pollination by insects is an example of an ecosystem service.
3

Ecosystem services are directly influenced by biodiversity, and biodiversity loss can disrupt these essential functions.

Which of the following pteridophytes produces both microspores and megaspores?

Dryopteris
Pteris
Salvinia
Adiantum
3

Salvinia is a heterosporous pteridophyte that produces both microspores (male) and megaspores (female).

Which type of phosphorylation occurs in the Electron Transport Chain?

Substrate-level phosphorylation
Oxidative phosphorylation
Photophosphorylation
Fermentative phosphorylation
2

Oxidative phosphorylation occurs in the Electron Transport Chain, where ATP is produced using a proton gradient.

Which of the following correctly describes the function of the thylakoid membrane?

It stores glucose.
It captures light energy for the light reactions.
It performs carbon fixation.
It synthesizes starch.
2

The thylakoid membrane contains chlorophyll and other pigments responsible for capturing light energy.

Which structure of the chloroplast is responsible for trapping light energy?

Stroma
Grana
Inner membrane
Plasmodesmata
2

Grana are stacks of thylakoids that contain chlorophyll, which traps light energy for photosynthesis.

Which of the following statements about trophic levels is correct?

Energy increases at higher trophic levels
Producers form the first trophic level
Herbivores belong to the third trophic level
Carnivores belong to the second trophic level
2

Producers occupy the first trophic level, as they convert solar energy into chemical energy through photosynthesis.

Which of the following statements about metaphase I is incorrect?

Homologous chromosomes align at the metaphase plate
Spindle fibers attach to kinetochores
Sister chromatids separate
Independent assortment occurs
3

In metaphase I, homologous chromosomes separate, but sister chromatids remain together.

Which type of age pyramid indicates a declining population?

Triangular age pyramid
Bell-shaped age pyramid
Inverted age pyramid
Pyramid with a broad base
3

An inverted age pyramid indicates a declining population, with a higher number of post-reproductive individuals and fewer young individuals.

What is the function of peroxisomes in cells?

Photosynthesis
Protein synthesis
Lipid synthesis
Breakdown of hydrogen peroxide
4

Peroxisomes contain enzymes such as catalase, which break down hydrogen peroxide into water and oxygen.

Which of the following correctly describes aneuploidy?

It refers to the complete extra sets of chromosomes.
It is caused by nondisjunction during cell division.
It always results in viable offspring.
It only occurs in sex chromosomes.
2

Aneuploidy is caused by nondisjunction, where chromosomes fail to separate properly during meiosis.

Which of the following statements about stomata is correct?

Each stoma is surrounded by guard cells.
Stomata are absent in leaves and present only in stems.
The outer walls of guard cells are thick, and the inner walls are thin.
Guard cells lack chloroplasts.
1

Each stoma is surrounded by two guard cells, which regulate its opening and closing. The outer walls are thin, and the inner walls are thick.

Which of the following statements about the formation of the pollen exine is correct?

The pollen exine is formed by the deposition of sporopollenin during pollen development.
The pollen exine is derived from the tapetum through cell fusion.
The pollen exine is composed mainly of cellulose and pectin.
The pollen exine forms only after the pollen reaches the stigma.
1

The exine is the highly resistant outer wall of the pollen grain, primarily composed of sporopollenin deposited during pollen development.

Which of the following is NOT an essential property of genetic material?

Ability to replicate
Structural stability
Ability to change (mutation)
Ability to directly catalyze biochemical reactions
4

Genetic material does not directly catalyze biochemical reactions; instead, proteins and ribozymes perform catalytic functions.

Which of the following statements about medullary rays in dicot stems is correct?

Medullary rays are made of parenchyma and help in lateral conduction.
Medullary rays are absent in dicot stems.
Medullary rays are made of sclerenchyma and provide mechanical strength.
Medullary rays are found only in monocot stems.
1

Medullary rays are parenchymatous cells between vascular bundles that facilitate lateral conduction in dicot stems.

Which scientist is credited with discovering the X-chromosome?

Thomas Hunt Morgan
Walter Sutton
Gregor Mendel
Henking
4

Henking discovered the X-chromosome while studying insect spermatogenesis.

Which of the following statements correctly defines a dominant allele?

An allele that is expressed only in the homozygous state
An allele that is always recessive
An allele that is expressed even in the heterozygous state
An allele that does not contribute to the phenotype
3

A dominant allele is expressed in both homozygous (AA) and heterozygous (Aa) conditions.

What is the primary role of the XIST gene in female mammals?

Determines male characteristics
Initiates X chromosome inactivation
Controls blood clotting
Regulates eye color
2

The XIST gene is responsible for X chromosome inactivation in female mammals.

Which component of the ribosome catalyzes peptide bond formation during translation?

mRNA
tRNA
rRNA
Peptidyl transferase
4

Peptidyl transferase, an enzymatic function of rRNA, catalyzes peptide bond formation during translation.

Which phase of meiosis is responsible for the formation of chiasmata?

Leptotene
Zygotene
Pachytene
Diplotene
4

During diplotene, homologous chromosomes begin to separate except at chiasmata, where crossing over has occurred.

Which of the following statements about genetic mutations is incorrect?

Frameshift mutations can be caused by insertions or deletions.
Silent mutations change the amino acid sequence of a protein.
Missense mutations result in a single amino acid change.
Nonsense mutations introduce a premature stop codon.
2

Silent mutations do not change the amino acid sequence, as the altered codon still codes for the same amino acid.

Which of the following correctly describes free central placentation?

Ovules are attached along the margins of the ovary
Ovules are attached to a central axis without septa
Ovules are attached to the inner wall of a unilocular ovary
Ovules are attached to the basal region of the ovary
2

In free central placentation, as seen in Dianthus, ovules are attached to a central axis, and the ovary lacks septa.

Which scientist first demonstrated that plants release oxygen during photosynthesis?

Joseph Priestley
Jan Ingenhousz
Melvin Calvin
Julius von Sachs
2

Jan Ingenhousz showed that green plants release oxygen in the presence of sunlight.

Which term describes a relationship where one species harms another but is unaffected itself?

Mutualism
Commensalism
Parasitism
Amensalism
4

Amensalism occurs when one species is harmed while the other remains unaffected, such as when a tree releases chemicals that inhibit the growth of nearby plants.

Which of the following pathways is considered amphibolic?

Glycolysis
Krebs cycle
Fermentation
Electron Transport Chain
2

The Krebs cycle is considered amphibolic because it involves both catabolic (breakdown of molecules) and anabolic (synthesis of precursors) processes.

Which type of bacteria plays a crucial role in the nitrogen cycle by oxidizing ammonia to nitrites?

Cyanobacteria
Nitrosomonas
Rhizobium
Clostridium
2

Nitrosomonas is a nitrifying bacterium that converts ammonia into nitrites, playing a key role in the nitrogen cycle.

Which of the following is an example of a species-rich ecosystem?

Temperate forests
Coral reefs
Grasslands
Deserts
2

Coral reefs are among the most species-rich ecosystems, supporting a high diversity of marine life.

Which of the following statements about seeds is correct?

The radicle develops into the root
The plumule gives rise to the root
Dicot seeds always contain endosperm
Monocot seeds have two cotyledons
1

The radicle develops into the root, while the plumule forms the shoot.

Which of the following codons serves as the start codon in most organisms?

UAA
AUG
UGA
UAG
2

AUG is the start codon, coding for methionine, and serves as the initiation signal for translation.

Which of the following statements about enhancers is correct?

Enhancers decrease transcription efficiency.
Enhancers function only in prokaryotes.
Enhancers increase transcription by binding activator proteins.
Enhancers are part of the ribosome.
3

**Enhancers are DNA sequences that increase transcription efficiency** by binding activator proteins.

Which of the following statements about Photosystem II (PSII) is correct?

PSII absorbs light at 700 nm wavelength.
Photolysis of water occurs in PSII.
PSII transfers electrons directly to NADP+.
Oxygen is not released in PSII.
2

PSII splits water molecules (photolysis), releasing oxygen and electrons.

Which of the following is NOT a function of the stem?

Conducting water
Performing photosynthesis
Providing anchorage
Storing food
3

Anchorage is a function of the root system, not the stem.

Which of the following statements about stem modifications is correct?

Rhizomes are aerial stems
Tendrils in cucurbits are modified stems
Thorns in bougainvillea are modified leaves
Tubers do not store food
2

Tendrils in cucurbits, such as pumpkin, are modified stems that help in climbing.

Which bacteria are primarily responsible for nitrogen fixation in leguminous plants?

Azotobacter
Rhizobium
Pseudomonas
Bacillus
2

Rhizobium forms symbiotic relationships with leguminous plants and helps in nitrogen fixation.

Which bacterial structure stores reserve materials like glycogen and phosphate?

Ribosomes
Plasmids
Inclusion bodies
Fimbriae
3

Inclusion bodies in prokaryotic cells store reserve materials such as glycogen granules, phosphate granules, and cyanophycean granules.

Which of the following is NOT a reason for greater biodiversity in tropical regions?

Long evolutionary time
Less seasonal variations
Higher solar energy input
Frequent glaciations
4

Unlike temperate regions, tropical regions have remained relatively undisturbed by glaciations, which allows for higher biodiversity.

Which of the following is NOT a function of RNA polymerase in eukaryotes?

Transcribing mRNA
Synthesizing DNA
Synthesizing rRNA
Catalyzing transcription
2

RNA polymerase is responsible for transcribing RNA from DNA but does not synthesize DNA itself.

Which of the following groups has the highest species diversity?

Fungi
Mammals
Birds
Reptiles
1

The Fungi group has more species than the combined total of fishes, amphibians, reptiles, and mammals.

Which of the following is correct about G2 phase?

G2 phase occurs before the S phase
The cell checks for DNA replication errors in G2 phase
G2 phase is longer than G1 phase
DNA replication takes place in G2 phase
2

The G2 phase is a checkpoint where the cell ensures that DNA replication was completed correctly before mitosis begins.

Which of the following is a function of DNA ligase?

Joins Okazaki fragments.
Synthesizes RNA primers.
Separates DNA strands.
Removes nucleotides from DNA strands.
1

DNA ligase **joins Okazaki fragments** on the lagging strand by forming phosphodiester bonds.

Which plant growth regulator is used to promote parthenocarpy in fruits like tomatoes?

Cytokinin
Gibberellin
Auxin
Ethylene
3

Auxin is commonly used to induce parthenocarpy, which results in seedless fruit development.

Which structure represents the female reproductive organ in a flower?

Stamen
Pistil (Carpel)
Petal
Sepal
2

The pistil or carpel, composed of the stigma, style, and ovary, is the female reproductive part of a flower.

Zoology

During spermatogenesis, which stage directly produces spermatids?

Spermatogonia
Primary spermatocytes
Secondary spermatocytes
Sertoli cells
3

Secondary spermatocytes undergo meiosis II to form spermatids, which later mature into spermatozoa.

Which of the following statements about histamine is incorrect?

Histamine is involved in allergic reactions.
Histamine is released by mast cells.
Histamine reduces inflammation.
Histamine causes vasodilation.
3

Histamine does not reduce inflammation; instead, it promotes inflammation by causing blood vessels to dilate.

Which of the following is a major symptom of elephantiasis?

Skin rashes
Severe swelling of limbs
High fever
Severe diarrhea
2

Elephantiasis, caused by filarial worms, leads to severe swelling of limbs due to blockage of lymphatic vessels.

Which part of the neuron contains the nucleus and most of the organelles?

Axon
Dendrite
Cell body
Synaptic knob
3

The cell body (or soma) contains the nucleus and most of the neuron's organelles.

What is the primary purpose of molecular diagnostics in disease management?

Crop improvement
Early detection of diseases
Production of transgenic animals
Enhancing drug metabolism
2

Molecular diagnostics enable early detection and management of diseases by identifying pathogens or genetic mutations.

Which of the following statements about somatic hybridization is true?

Somatic hybridization involves the fusion of whole plant cells.
Somatic hybridization is used for producing genetically identical clones.
Somatic hybridization involves the fusion of protoplasts from different species.
Somatic hybridization is the same as gene cloning.
3

Somatic hybridization involves the fusion of protoplasts from different species to form hybrid plants with combined traits.

Which of the following is correct about the function of the lymphatic system?

It carries oxygen to tissues.
It helps in the absorption of fats from the intestine.
It transports carbon dioxide to the lungs.
It is responsible for the production of RBCs.
2

The **lymphatic system absorbs fats** through lacteals present in the small intestine.

Which of the following is an advantage of PCR over traditional cloning methods?

It requires living cells
It amplifies DNA within hours
It does not require a DNA template
It does not use enzymes
2

PCR is a rapid method that can amplify DNA sequences within hours, unlike traditional cloning, which takes days or weeks.

Which molecule is produced during Bt toxin activation in the insect gut?

Inactive protoxin
Active toxin
DNA polymerase
mRNA
2

Bt toxin is activated in the alkaline environment of the insect gut, converting it from an inactive protoxin to an active toxin.

Which of the following is a hormone-based contraceptive method?

Condoms
Diaphragm
Oral contraceptive pills
Copper-T
3

Oral contraceptive pills contain hormones like estrogen and progestogen that prevent ovulation.

Which of the following is an example of a physiological barrier in innate immunity?

Skin
Tears
Macrophages
Lymph nodes
2

Tears contain lysozyme, which acts as a physiological barrier by breaking down bacterial cell walls.

Which of the following bonds holds nucleotides together in a DNA strand?

Peptide bond
Glycosidic bond
Phosphodiester bond
Hydrogen bond
3

Phosphodiester bonds link nucleotides in a DNA strand by joining the phosphate group of one nucleotide to the sugar of another.

Which mosquito-borne disease is characterized by recurring fever and chills?

Filariasis
Malaria
Dengue
Chikungunya
2

Malaria, caused by Plasmodium species, is characterized by recurring fever and chills due to the release of haemozoin toxin.

Which type of evolution is represented by the development of similar adaptations in unrelated species?

Divergent Evolution
Convergent Evolution
Parallel Evolution
Co-evolution
2

Convergent evolution occurs when unrelated species develop similar adaptations due to similar environmental pressures.

Which endocrine gland in frogs plays a key role in metamorphosis?

Adrenal gland
Thyroid gland
Pituitary gland
Thymus gland
2

The thyroid gland in frogs releases hormones that regulate metamorphosis from the tadpole stage to adulthood.

Which of the following statements is correct about proteins?

Proteins are composed of nucleotides.
Proteins are formed by peptide bonds between amino acids.
Proteins store genetic information.
Proteins do not play a role in enzyme activity.
2

Proteins are formed by peptide bonds between amino acids. They do not store genetic information; that function belongs to nucleic acids.

Which of the following is incorrect?

Natural selection favors individuals with traits that increase survival and reproduction.
Analogous organs have similar functions but different evolutionary origins.
Panspermia proposes that life originated from non-living organic molecules.
Mutation introduces genetic variation into populations.
3

Panspermia proposes that life came from outer space, not from non-living organic molecules.

Which of the following is a characteristic of enzymes?

They are consumed in reactions
They lower activation energy
They function only at high temperatures
They catalyze all chemical reactions
2

Enzymes function by lowering the activation energy required for biochemical reactions.

Which of the following has the highest solubility in blood?

Oxygen
Nitrogen
Carbon dioxide
Argon
3

Carbon dioxide is 20-25 times more soluble in blood than oxygen, making it easier to transport.

Which of the following is incorrect?

Natural selection results in the survival of individuals with advantageous traits.
Fossil evidence provides insights into extinct species.
Analogous organs have different functions but similar structures.
Mutations introduce genetic variation into a population.
3

Analogous organs have similar functions but different structures and evolutionary origins.

Which of the following is incorrect about molecular diagnostics?

Molecular diagnostics uses PCR for pathogen detection.
Molecular diagnostics is used for identifying genetic mutations.
Molecular diagnostics relies solely on light microscopy.
Molecular diagnostics helps in early disease detection.
3

Molecular diagnostics does not rely solely on light microscopy; it uses advanced techniques like PCR and hybridization for accurate detection.

Which of the following is incorrect?

Darwin’s theory is based on the concept of natural selection.
Hugo de Vries proposed that mutations cause evolution.
Adaptive radiation is also known as divergent evolution.
The Hardy-Weinberg Principle states that allele frequencies change continuously in a stable population.
4

The Hardy-Weinberg Principle states that allele frequencies remain constant in a population unless disturbed by evolutionary forces.

Which assisted reproductive technique involves transferring a fertilized embryo directly into the uterine cavity?

Intracytoplasmic sperm injection (ICSI)
Gamete intrafallopian transfer (GIFT)
Zygote intrafallopian transfer (ZIFT)
Embryo transfer (ET) following in vitro fertilization (IVF)
4

Embryo transfer (ET) is the final step in IVF where the cultured embryo is placed into the uterine cavity for implantation.

Which structure is primarily responsible for early fetal nutrition before placental circulation is fully established?

Chorionic villi
Yolk sac
Amnion
Umbilical cord
2

The yolk sac provides early nutrition to the developing embryo before the placenta takes over nutrient exchange.

Which type of fertilization occurs in reptiles?

External fertilization
Internal fertilization
Parthenogenesis
Viviparous fertilization
2

Reptiles exhibit internal fertilization, where fertilization occurs inside the female’s body before laying eggs.

Which excretory structure is found in earthworms?

Malpighian tubules
Flame cells
Nephridia
Green glands
3

Earthworms possess nephridia, which help in excretion and osmoregulation.

Which bone articulates with the occipital condyles of the skull to form the atlanto-occipital joint?

Axis
Atlas
Mandible
Clavicle
2

The atlas (first cervical vertebra) articulates with the occipital condyles of the skull, allowing nodding movements.

Which of the following is an example of a selectable marker used in recombinant DNA technology?

Ori site
Antibiotic resistance gene
Promoter region
Shine-Dalgarno sequence
2

Antibiotic resistance genes help in selecting transformed cells by allowing only recombinant cells to survive in antibiotic-containing media.

What is the primary driving force for oxygen diffusion in the lungs?

Temperature gradient
Partial pressure gradient
pH gradient
Hemoglobin concentration
2

The primary driving force for oxygen diffusion in the lungs is the partial pressure gradient between alveolar air and blood.

Which of the following statements about the role of ADH is correct?

ADH increases water reabsorption in the collecting ducts.
ADH promotes sodium excretion in urine.
ADH reduces the permeability of the collecting ducts to water.
ADH is secreted by the adrenal cortex.
1

ADH increases the permeability of the collecting ducts, allowing more water reabsorption and reducing urine volume.

Which chamber of the heart pumps deoxygenated blood into the pulmonary circulation?

Left atrium
Right atrium
Left ventricle
Right ventricle
4

The right ventricle pumps deoxygenated blood into the pulmonary artery, which carries it to the lungs for oxygenation.

Which of the following best describes fetal circulation during pregnancy?

Fetal blood oxygenation occurs entirely in the lungs
The placenta is the primary organ for gas exchange
The ductus arteriosus directs oxygenated blood away from the heart
The foramen ovale is a permanent structure in the fetal heart
2

In fetal circulation, the placenta serves as the main organ for oxygenation and gas exchange since the lungs are non-functional.

Which of the following statements about the nervous system of frogs is incorrect?

Frogs have a well-developed brain with forebrain, midbrain, and hindbrain.
Frogs have 10 pairs of cranial nerves.
The spinal cord extends throughout the length of the body.
Frog brains contain optic lobes responsible for vision.
2

Frogs have 10 pairs of cranial nerves, not 12 as seen in mammals.

Which statement about muscles is incorrect?

Cardiac muscles are involuntary.
Skeletal muscles are striated and voluntary.
Visceral muscles are voluntary in nature.
Smooth muscles are found in the walls of internal organs.
3

Visceral muscles are involuntary, not voluntary.

Which of the following statements about action potentials is incorrect?

Action potentials occur due to ion movement across the neuron's membrane.
Sodium (Na⁺) ions enter the neuron during depolarization.
Potassium (K⁺) ions leave the neuron during repolarization.
Action potentials can travel in both directions along an axon.
4

Action potentials travel in only one direction due to the refractory period, which prevents backflow.

Which of the following is a major cause of infertility in both males and females?

Lack of exercise
Immunological and congenital disorders
Excess protein intake
Use of herbal medicines
2

Infertility can be caused by congenital, immunological, and physiological factors affecting reproductive health.

Which of the following statements about lipids is incorrect?

Lipids are insoluble in water.
Lipids function as a primary energy source.
Lipids form structural components of cell membranes.
Lipids contain peptide bonds.
4

Lipids do not contain peptide bonds; these are found in proteins.

Which of the following statements about osteoporosis is incorrect?

It leads to decreased bone mass.
It is caused by increased calcium absorption.
It increases fracture risk.
It is common in elderly individuals.
2

Osteoporosis is caused by decreased calcium absorption, not increased absorption​.

Which of the following is an incorrect statement about the pituitary gland?

The pituitary gland is located at the base of the brain.
The anterior pituitary secretes growth hormone.
The posterior pituitary produces oxytocin and ADH.
The pituitary gland is also called the master gland.
3

The posterior pituitary stores and releases oxytocin and ADH, but these hormones are produced by the hypothalamus.

Which of the following statements about restriction enzymes is incorrect?

They cut DNA at specific recognition sites.
They always produce blunt ends.
They are derived from bacteria.
They recognize palindromic sequences in DNA.
2

Restriction enzymes can produce either sticky or blunt ends when cutting DNA, depending on the enzyme type.

Which of the following is NOT a feature of a good cloning vector?

Selectable marker
Multiple cloning sites
Lack of origin of replication
Ability to replicate independently
3

A good cloning vector must have an origin of replication to ensure its multiplication inside the host cell.

Which of the following statements about the posterior pituitary is incorrect?

The posterior pituitary stores and releases ADH and oxytocin.
The posterior pituitary synthesizes its own hormones.
The posterior pituitary is connected to the hypothalamus.
The posterior pituitary releases hormones into the bloodstream.
2

The posterior pituitary does not synthesize hormones; it only stores and releases ADH and oxytocin, which are produced by the hypothalamus.

Which of the following is a correct characteristic of reptiles?

They are warm-blooded animals
They have an exoskeleton made of calcium carbonate
They excrete uric acid as their primary nitrogenous waste
They undergo external fertilization
3

Reptiles are uricotelic, meaning they excrete uric acid to conserve water.

Which of the following groups has a closed circulatory system?

Arthropods
Molluscs
Annelids
Echinoderms
3

Annelids have a closed circulatory system with blood confined to vessels.

Which phylum is characterized by animals with a body wall containing ostia and a spongocoel?

Cnidaria
Porifera
Platyhelminthes
Annelida
2

Members of phylum Porifera (sponges) have a body wall with ostia (tiny pores) leading to the spongocoel, allowing water circulation.

Performance Summary

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Answers		 Incorrect
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Physics
Chemistry
Botany
Zoology

Overall Score

Score: / 720

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Total Attempts: / 180
Total Skipped: / 180
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180