NEET Full-Length Mock Test 8

NEET Mock Test - 2026

Test 8

Number Of Questions: 180

Time: 3 hours

Correct answer Carries: 4.

Wrong Answer Carries: -1.

3:00:00

Physics

A \( 4 \, \text{kg} \) block on a horizontal surface (\( \mu_k = 0.25 \)) is connected to a \( 2 \, \text{kg} \) mass over a pulley. A \( 10 \, \text{N} \) horizontal force opposes the motion. What is the acceleration? (Take \( g = 10 \, \text{m/s}^2 \))

For \( 2 \, \text{kg} \): \( 2g - T = 2a \Rightarrow 20 - T = 2a \).

For \( 4 \, \text{kg} \): \( T - f_k - 10 = 4a \), \( f_k = 0.25 \times 4 \times 10 = 10 \, \text{N} \).

\( T - 10 - 10 = 4a \Rightarrow T - 20 = 4a \).

Solve: \( 20 - T = 2a \), \( T - 20 = 4a \).

Substitute \( T = 20 - 2a \) into \( 20 - 2a - 20 = 4a \Rightarrow -2a = 4a - 20 \).

\( 6a = 20 \Rightarrow a = \frac{20}{6} \approx 3.33 \, \text{m/s}^2 \).

2 m/s²
2.5 m/s²
3.33 m/s²
4 m/s²
3

In Bohr’s model, what is the state of a hydrogen atom when its electron is in the \( n = \infty \) orbit?

At \( n = \infty \), the energy is zero, meaning the electron is ionized and no longer bound to the nucleus.

Ground state
First excited state
Ionized state
Unstable state
3

What is the angular position of the first minimum in a single-slit diffraction pattern if the slit width is \( 10.0 \, \mu\text{m} \) and the wavelength is \( 500 \, \text{nm} \)?

First minimum occurs at \( \sin \theta = \frac{\lambda}{a} \).

\( \lambda = 5.0 \times 10^{-7} \, \text{m} \), \( a = 1.0 \times 10^{-5} \, \text{m} \).

\( \sin \theta = \frac{5.0 \times 10^{-7}}{1.0 \times 10^{-5}} = 0.05 \), \( \theta = \sin^{-1}(0.05) \approx 2.9^\circ \).

4.6°
2.9°
5.7°
8.6°
2

A light ray passes from water (\( n = 1.33 \)) to glass (\( n = 1.5 \)) at an angle of incidence of \( 30^\circ \). What is the angle of refraction?

Snell’s law: \( n_1 \sin i = n_2 \sin r \).

\( 1.33 \sin 30^\circ = 1.5 \sin r \).

\( \sin 30^\circ = 0.5 \Rightarrow 1.33 \times 0.5 = 1.5 \sin r \Rightarrow 0.665 = 1.5 \sin r \).

\( \sin r = \frac{0.665}{1.5} \approx 0.443 \Rightarrow r = \sin^{-1}(0.443) \approx 26.3^\circ \).

20°
26°
30°
35°
2

What is the SI unit of a quantity with dimensional formula \( [M L^2 T^{-3} A^{-1}] \)?

\( [M] = \text{kg}, [L] = \text{m}, [T] = \text{s}, [A] = \text{A} \).

\( [M L^2 T^{-3} A^{-1}] = \text{kg m}^2 \text{s}^{-3} \text{A}^{-1} \).

(Matches electric potential: Volt = \( \text{W/A} = \text{kg m}^2 \text{s}^{-3} \text{A}^{-1} \)).

kg m² s⁻² A⁻¹
kg m s⁻³ A⁻¹
kg m² s⁻³ A⁻¹
kg m² s⁻³ A
3

A gas mixture contains 4 g of helium and 32 g of oxygen. What is the total pressure if the volume is 22.4 litres at 273 K? (\(R = 8.31 \, \text{J mol}^{-1} \text{K}^{-1}\))

\(\mu_{\text{He}} = \frac{4}{4} = 1 \, \text{mol}\), \(\mu_{\text{O}_2} = \frac{32}{32} = 1 \, \text{mol}\).

Total moles = \(1 + 1 = 2 \, \text{mol}\), \(V = 22.4 \times 10^{-3} \, \text{m}^3\).

\(P = \frac{\mu R T}{V} = \frac{2 \times 8.31 \times 273}{22.4 \times 10^{-3}} = 2.02 \times 10^5 \, \text{Pa} \approx 2 \, \text{atm} \).

1 atm
2 atm
3 atm
4 atm
2

In dimensional analysis, what is true about the arguments of functions like sine or logarithm?

From Section 1.6.1: Arguments of trigonometric, logarithmic, and exponential functions must be dimensionless (e.g., angle as \( [L]/[L] \)).

They must have units
They must have dimensions of time
They can have any dimensions
They must be dimensionless
4

An electron moves with a speed of \( 2 \times 10^6 \, \text{m/s} \) perpendicular to a magnetic field of \( 0.7 \, \text{T} \). What is the radius of its path? (Mass = \( 9.1 \times 10^{-31} \, \text{kg} \), charge = \( 1.6 \times 10^{-19} \, \text{C} \))

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

\( r = \frac{9.1 \times 10^{-31} \times 2 \times 10^6}{1.6 \times 10^{-19} \times 0.7} = \frac{1.82 \times 10^{-24}}{1.12 \times 10^{-19}} = 1.625 \times 10^{-5} \, \text{m} = 1.625 \times 10^{-3} \, \text{cm} \).

1.625 × 10⁻³ cm
3.25 × 10⁻³ cm
8.13 × 10⁻⁴ cm
2.44 × 10⁻³ cm
1

The maximum speed of photoelectrons is \( 7.0 \times 10^5 \, \text{m/s} \). What is the maximum kinetic energy in joules? (Take \( m_e = 9.11 \times 10^{-31} \, \text{kg} \))

\( K_{\max} = \frac{1}{2} m v_{\max}^2 = \frac{1}{2} \times 9.11 \times 10^{-31} \times (7.0 \times 10^5)^2 \).

\( K_{\max} = \frac{1}{2} \times 9.11 \times 10^{-31} \times 4.9 \times 10^{11} \approx 2.231 \times 10^{-19} \, \text{J} \).

2.0 × 10⁻¹⁹ J
2.231 × 10⁻¹⁹ J
2.5 × 10⁻¹⁹ J
3.0 × 10⁻¹⁹ J
2

A steel rod has a length of \( 1 \, \text{m} \) at \( 20^\circ \text{C} \). What will be its length at \( 120^\circ \text{C} \) if the coefficient of linear expansion of steel is \( 1.2 \times 10^{-5} \, \text{K}^{-1} \)?

Given: \( L_0 = 1 \, \text{m} \), \( T_1 = 20^\circ \text{C} \), \( T_2 = 120^\circ \text{C} \), \( \alpha_l = 1.2 \times 10^{-5} \, \text{K}^{-1} \).

\( \Delta T = 120 - 20 = 100^\circ \text{C} \).

Linear expansion: \( \Delta L = L_0 \alpha_l \Delta T = 1 \times 1.2 \times 10^{-5} \times 100 = 1.2 \times 10^{-3} \, \text{m} \).

New length: \( L = L_0 + \Delta L = 1 + 0.0012 = 1.0012 \, \text{m} \).

1.00012 m
1.0012 m
1.012 m
1.002 m
2

A torque of \( 9 \, \text{Nm} \) is applied to a wheel with moment of inertia \( 3 \, \text{kg m}^2 \). What is its angular acceleration?

\( \tau = I \alpha \).

\( \tau = 9 \, \text{Nm} \), \( I = 3 \, \text{kg m}^2 \).

\( \alpha = \frac{\tau}{I} = \frac{9}{3} = 3 \, \text{rad/s}^2 \).

2 rad/s²
3 rad/s²
4 rad/s²
5 rad/s²
2

At what height above Earth’s surface is \( g \) reduced to \( 7.84 \, \text{m/s}^2 \)? (\( g_0 = 9.8 \, \text{m/s}^2, R_E = 6.4 \times 10^6 \, \text{m} \))

\( g(h) = \frac{g_0}{(1 + h/R_E)^2} \).

\( 7.84 = \frac{9.8}{(1 + h/R_E)^2} \).

\( (1 + h/R_E)^2 = 1.25 \).

\( 1 + h/R_E = \sqrt{1.25} \approx 1.118 \).

\( h/R_E = 0.118 \).

\( h = 0.118 \times 6.4 \times 10^6 \approx 7.55 \times 10^5 \, \text{m} \).

7.4 × 10⁵ m
7.5 × 10⁵ m
7.6 × 10⁵ m
7.7 × 10⁵ m
3

In a full-wave rectifier with centre-tap transformer, the output frequency for a 50 Hz input is:

A full-wave rectifier doubles the input frequency by using both half-cycles, so for a 50 Hz input, the output frequency is \( 50 \times 2 = 100 \, \text{Hz} \).

50 Hz
25 Hz
150 Hz
100 Hz
4

What is the gravitational force on a \( 11 \, \text{kg} \) mass \( 9 \, \text{m} \) from the center of a spherical shell of mass \( 500 \, \text{kg} \) and radius \( 7 \, \text{m} \)? (\( G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \))

Outside shell: \( F = \frac{G M m}{r^2} \).

\( F = \frac{6.67 \times 10^{-11} \times 500 \times 11}{9^2} \).

\( F = \frac{3.6685 \times 10^{-8}}{81} \approx 4.53 \times 10^{-10} \, \text{N} \).

4.4 × 10⁻¹⁰ N
4.5 × 10⁻¹⁰ N
4.6 × 10⁻¹⁰ N
4.7 × 10⁻¹⁰ N
2

A material with susceptibility \( \chi = -3 \times 10^{-5} \) has a relative permeability \( \mu_r \) of:

\( \mu_r = 1 + \chi \).

Given: \( \chi = -3 \times 10^{-5} \).

Substitute: \( \mu_r = 1 - 3 \times 10^{-5} = 0.99997 \).

0.99997
1.00003
0.99995
1.00005
1

What is the path difference for the second bright fringe in a double-slit experiment?

Constructive interference occurs at \( \Delta = n\lambda \). For the second bright fringe, \( n = 2 \), so \( \Delta = 2\lambda \).

\( \lambda \)
\( 2\lambda \)
\( \frac{\lambda}{2} \)
\( 3\lambda \)
2

A train accelerates uniformly from \( 15 \, \text{m/s} \) to \( 35 \, \text{m/s} \) in \( 8 \, \text{s} \). What is the distance covered?

Find \( a = \frac{v - v_0}{t} = \frac{35 - 15}{8} = 2.5 \, \text{m/s}^2 \).

Use \( x = v_0 t + \frac{1}{2} a t^2 = 15 \cdot 8 + \frac{1}{2} \cdot 2.5 \cdot (8)^2 = 120 + 80 = 200 \, \text{m} \).

The distance covered is \( 200 \, \text{m} \).

180 m
220 m
150 m
200 m
4

What is the binding energy of a nucleus if its mass defect is \( 0.15 \, \text{u} \)? (Given \( 1 \, \text{u} = 931.5 \, \text{MeV/c}^2 \))

\( E_b = \Delta M \cdot c^2 \).

\( \Delta M = 0.15 \, \text{u} \).

\( E_b = 0.15 \times 931.5 = 139.725 \, \text{MeV} \approx 139.73 \, \text{MeV} \).

130.0 MeV
135.0 MeV
139.73 MeV
145.0 MeV
3

A bike moving at \( 126 \, \text{km/h} \) decelerates uniformly and stops in \( 7 \, \text{s} \). What is the magnitude of deceleration?

Convert speed: \( 126 \, \text{km/h} = 126 \cdot \frac{1000}{3600} = 35 \, \text{m/s} \).

Use \( a = \frac{v - v_0}{t} \). Here, \( v = 0 \), \( v_0 = 35 \, \text{m/s} \), \( t = 7 \, \text{s} \).

Substitute: \( a = \frac{0 - 35}{7} = -5 \, \text{m/s}^2 \).

Magnitude of deceleration is \( 5 \, \text{m/s}^2 \).

5 m/s²
4 m/s²
6 m/s²
3 m/s²
1

In reverse bias, the width of the depletion region:

In reverse bias, the applied voltage increases the barrier height and electric field, widening the depletion region as more immobile charges are exposed due to reduced carrier diffusion.

Decreases
Remains unchanged
Increases
Becomes zero
3

Why does the height of a mercury column in a barometer decrease during a storm?

The barometer measures atmospheric pressure (\( P_a = \rho g h \)). During a storm, atmospheric pressure drops, reducing the force supporting the mercury column, causing its height to decrease, as noted in the chapter.

Mercury’s viscosity increases
Surface tension changes
Density of mercury decreases
Atmospheric pressure decreases
4

What is the primary factor affecting the maximum height of a projectile launched from level ground?

The maximum height \( h_m = \frac{(v_0 \sin \theta_0)^2}{2g} \) depends on the initial vertical velocity component (\( v_0 \sin \theta_0 \)). This component, influenced by both speed and angle, determines how high the projectile rises against gravity.

Horizontal velocity
Total speed alone
Launch angle alone
Initial vertical velocity component
4

A photon’s energy is \( 3.0 \, \text{eV} \). What is its momentum? (Take \( c = 3 \times 10^8 \, \text{m/s} \), \( 1 \, \text{eV} = 1.6 \times 10^{-19} \, \text{J} \))

\( E = 3.0 \times 1.6 \times 10^{-19} = 4.8 \times 10^{-19} \, \text{J} \).

For a photon, \( p = \frac{E}{c} = \frac{4.8 \times 10^{-19}}{3 \times 10^8} = 1.6 \times 10^{-27} \, \text{kg m/s} \).

1.4 × 10⁻²⁷ kg m/s
1.5 × 10⁻²⁷ kg m/s
1.6 × 10⁻²⁷ kg m/s
1.8 × 10⁻²⁷ kg m/s
3

Two particles of masses \( 4 \, \text{kg} \) and \( 6 \, \text{kg} \) are at \( (0, 7) \) and \( (8, 3) \) respectively. What is the distance of their center of mass from the origin?

\( X = \frac{(4 \times 0) + (6 \times 8)}{4 + 6} = \frac{48}{10} = 4.8 \).

\( Y = \frac{(4 \times 7) + (6 \times 3)}{4 + 6} = \frac{28 + 18}{10} = 4.6 \).

Distance = \( \sqrt{(4.8)^2 + (4.6)^2} = \sqrt{23.04 + 21.16} = \sqrt{44.2} \approx 6.65 \, \text{m} \).

6.4 m
6.65 m
6.8 m
7.0 m
2

A \( 6 \, \text{kg} \) block slides down a frictionless incline from \( 10 \, \text{m} \) height. What is its speed at the bottom? (Take \( g = 10 \, \text{m/s}^2 \))

Potential energy \( mgh = 6 \times 10 \times 10 = 600 \, \text{J} \).

Kinetic energy \( \frac{1}{2} m v^2 = 600 \Rightarrow v^2 = 200 \Rightarrow v = \sqrt{200} \approx 14.14 \, \text{m/s} \).

13.5 m/s
14 m/s
14.5 m/s
15 m/s
2

A wire of length \( 6 \, \text{m} \) and cross-sectional area \( 5 \times 10^{-6} \, \text{m}^2 \) has a resistance of \( 12 \, \Omega \). What is the resistivity of the material?

Resistance: \( R = \frac{\rho l}{A} \).

Rearrange: \( \rho = \frac{R A}{l} \).

Substitute: \( \rho = \frac{12 \times 5 \times 10^{-6}}{6} = 10 \times 10^{-6} = 1.0 \times 10^{-5} \, \Omega \text{m} \).

\( 1.0 \times 10^{-5} \, \Omega \text{m} \)
\( 1.2 \times 10^{-5} \, \Omega \text{m} \)
\( 1.5 \times 10^{-5} \, \Omega \text{m} \)
\( 1.8 \times 10^{-5} \, \Omega \text{m} \)
1

A coil of 80 turns is placed in a magnetic field that increases from 0 to 0.03 Wb/m² in 0.2 s. If the coil area is 0.05 m², what is the induced emf?

Flux change: \( \Delta \Phi = B A = 0.03 \times 0.05 = 0.0015 \, \text{Wb} \).

\( \varepsilon = N \frac{\Delta \Phi}{\Delta t} = 80 \times \frac{0.0015}{0.2} = 80 \times 0.0075 = 0.6 \, \text{V} \).

0.6 V
0.8 V
1.0 V
1.2 V
1

In a system of two parallel plate capacitors with different dielectrics connected in parallel, why does the capacitor with a higher dielectric constant store more energy for the same applied voltage?

In parallel, both capacitors have the same voltage \( V \). Capacitance is \( C = \frac{K \varepsilon_0 A}{d} \), where \( K \) is the dielectric constant. A higher \( K \) increases \( C \). Energy stored is \( U = \frac{1}{2} C V^2 \), so a larger \( C \) (due to higher \( K \)) leads to more energy stored for the same \( V \). The higher \( K \) allows more charge (\( Q = C V \)) to be stored, increasing energy without changing \( V \).

It has a smaller capacitance
It stores more energy due to larger capacitance
The electric field is stronger
The voltage across it is higher
2

What is the change in internal energy when \( 0.1 \, \text{kg} \) of lead is heated from \( 20^\circ \text{C} \) to \( 40^\circ \text{C} \)? (Specific heat of lead = \( 127.7 \, \text{J kg}^{-1} \text{K}^{-1} \))

\( \Delta U = m s \Delta T \) (no work in constant volume or solid).

\( m = 0.1 \), \( s = 127.7 \), \( \Delta T = 40 - 20 = 20 \).

\( \Delta U = 0.1 \times 127.7 \times 20 = 255.4 \, \text{J} \).

200 J
255 J
300 J
350 J
2

A circular coil of radius 8 cm and 150 turns rotates at 25 rad/s in a 0.06 T field. What is the maximum emf induced?

\( A = \pi r^2 = 3.14 \times (0.08)^2 = 0.0201 \, \text{m}^2 \).

\( \varepsilon_0 = N B A \omega = 150 \times 0.06 \times 0.0201 \times 25 = 4.5225 \, \text{V} \approx 4.52 \, \text{V} \).

4.52 V
5.0 V
5.5 V
6.0 V
1

A brass wire of length \( 1.9 \, \text{m} \) and cross-sectional area \( 2 \times 10^{-6} \, \text{m}^2 \) is stretched by a force producing a strain of \( 2 \times 10^{-4} \). If the Young's modulus of brass is \( 9 \times 10^{10} \, \text{N/m}^2 \), what is the force applied?

Young's modulus: \( Y = \frac{\text{Stress}}{\text{Strain}} \).

Stress: \( \text{Stress} = Y \times \text{Strain} = 9 \times 10^{10} \times 2 \times 10^{-4} = 1.8 \times 10^7 \, \text{N/m}^2 \).

Force: \( F = \text{Stress} \times A = 1.8 \times 10^7 \times 2 \times 10^{-6} = 36 \, \text{N} \).

\( 30 \, \text{N} \)
\( 36 \, \text{N} \)
\( 40 \, \text{N} \)
\( 45 \, \text{N} \)
2

A pipe closed at one end has a length of 0.8 m and resonates at its third harmonic with a speed of sound of 360 m/s. What is the frequency?

For closed pipe: \( v_n = (n + \frac{1}{2}) \frac{v}{2L} \), \( n = 2 \) for third harmonic.

\( v_2 = (2 + \frac{1}{2}) \frac{360}{2 \times 0.8} = 2.5 \times \frac{360}{1.6} = 2.5 \times 225 = 562.5 \, \text{Hz} \).

500 Hz
550 Hz
562.5 Hz
575 Hz
3

In electromagnetic wave propagation, what ensures energy conservation during wave travel?

The energy in an electromagnetic wave is carried by both electric and magnetic fields, with the total energy flux described by the Poynting vector, ensuring conservation during propagation.

Static fields
Medium interactions
Poynting vector
Frequency variation
3

A \( 10 \, \text{kg} \) mass at \( 8 \, \text{m/s} \) collides inelastically with a stationary \( 5 \, \text{kg} \) mass. What is the final speed?

Momentum conservation: \( 10 \times 8 = (10 + 5) v_f \Rightarrow 80 = 15 v_f \Rightarrow v_f = \frac{80}{15} \approx 5.33 \, \text{m/s} \).

5 m/s
5.3 m/s
5.6 m/s
6 m/s
2

A magnetic dipole experiences a torque of \( 0.02 \, \text{N m} \) in a field of \( 0.4 \, \text{T} \) at \( 90^\circ \). What is its magnetic moment?

\( \tau = m B \sin\theta \), so \( m = \frac{\tau}{B \sin\theta} \).

Given: \( \tau = 0.02 \, \text{N m} \), \( B = 0.4 \, \text{T} \), \( \theta = 90^\circ \), \( \sin 90^\circ = 1 \).

\( m = \frac{0.02}{0.4 \times 1} = 0.05 \, \text{A m}^2 \).

0.02 A m²
0.05 A m²
0.08 A m²
0.1 A m²
2

A transformer has \( N_p = 800 \), \( N_s = 400 \). If \( V_s = 110 \, \text{V} \) (rms), what is the primary voltage?

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

\( V_p = V_s \times \frac{N_p}{N_s} = 110 \times \frac{800}{400} = 220 \, \text{V} \).

200 V
210 V
230 V
220 V
4

Why is high voltage used in power transmission lines to reduce energy loss?

Power loss in lines is \( P_{\text{loss}} = I^2 R \). For a given power (\( P = V I \)), increasing \( V \) reduces \( I \) (\( I = P / V \)), significantly lowering \( I^2 R \) losses.

Increases conductor resistance
Reduces line length
Increases current efficiency
Reduces current and thus resistive losses
4

A dipole \( p = 6 \times 10^{-9} \, \text{C m} \) is rotated from \( \theta = 0^\circ \) to \( 90^\circ \) in a field \( E = 3 \times 10^5 \, \text{N/C} \). What is the work done?

Work done: \( W = p E (\cos \theta_0 - \cos \theta_1) = 6 \times 10^{-9} \times 3 \times 10^5 \times (\cos 0^\circ - \cos 90^\circ) \).

\( W = 6 \times 10^{-9} \times 3 \times 10^5 \times (1 - 0) = 1.8 \times 10^{-3} \, \text{J} \).

1.5 × 10⁻³ J
2 × 10⁻³ J
1.6 × 10⁻³ J
1.8 × 10⁻³ J
4

A wire of length \( 0.6 \, \text{m} \) carrying \( 9 \, \text{A} \) is at \( 60^\circ \) to a magnetic field of \( 0.4 \, \text{T} \). What is the force on the wire?

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

\( F = 9 \times 0.6 \times 0.4 \times \sin 60^\circ = 2.16 \times 0.866 = 1.8706 \approx 1.87 \, \text{N} \).

1.08 N
2.16 N
1.5 N
1.87 N
4

A \( 7 \, \text{kg} \) block on a horizontal surface (\( \mu_k = 0.3 \)) is pulled by a \( 4 \, \text{kg} \) mass over a pulley. A \( 14 \, \text{N} \) force opposes the \( 7 \, \text{kg} \) block. What is the acceleration? (Take \( g = 10 \, \text{m/s}^2 \))

For \( 4 \, \text{kg} \): \( 4g - T = 4a \Rightarrow 40 - T = 4a \).

For \( 7 \, \text{kg} \): \( T - f_k - 14 = 7a \).

Normal: \( N = mg = 7 \times 10 = 70 \, \text{N} \).

Friction: \( f_k = 0.3 \times 70 = 21 \, \text{N} \).

Net force: \( T - 21 - 14 = 7a \Rightarrow T - 35 = 7a \).

Solve: \( 40 - T = 4a \), \( T - 35 = 7a \).

Substitute: \( 40 - (7a + 35) = 4a \Rightarrow 40 - 35 - 7a = 4a \Rightarrow 5 = 11a \).

\( a = \frac{5}{11} \approx 0.45 \, \text{m/s}^2 \).

0.4 m/s²
0.45 m/s²
0.5 m/s²
0.6 m/s²
2

A spring of \( k = 180 \, \text{N/m} \) has a \( 0.9 \, \text{kg} \) mass. If \( E = 0.9 \, \text{J} \), what is the amplitude?

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

\( 0.9 = 0.5 \times 180 \times A^2 \Rightarrow 0.9 = 90 A^2 \Rightarrow A^2 = 0.01 \Rightarrow A = 0.1 \, \text{m} \).

0.05 m
0.08 m
0.1 m
0.12 m
3

What is the primary reason a concave lens cannot form a real image?

A concave lens diverges light rays, preventing them from converging to a point on the opposite side. The rays appear to diverge from a virtual focal point on the same side as the object, resulting in a virtual image that cannot be projected, regardless of object position.

It has a positive focal length
It reflects light instead of refracting
It diverges light rays
It absorbs most incident light
3

What ensures that the total current entering a junction equals the total current leaving it in a complex circuit?

Kirchhoff’s junction rule, based on charge conservation, ensures that charge does not accumulate at a junction in steady state, so the sum of currents in equals the sum out.

Voltage balance
Resistance equality
Field cancellation
Charge conservation
4

Why does the electric field inside a charged conducting shell remain zero even when an external field is applied?

Charges on the conductor’s surface redistribute to cancel any external field inside, creating an electrostatic shield. This shielding effect ensures the internal field is zero, as charges adjust to maintain equilibrium within the conductor.

Charge quantization
Field symmetry
Electrostatic shielding
Charge density
3

The electrical conductivity of a semiconductor is:

Semiconductors have intermediate conductivity (\( 10^5 \) to \( 10^{-6} \, \text{S} \, \text{m}^{-1} \)), between metals (\( 10^2 \) to \( 10^8 \, \text{S} \, \text{m}^{-1} \)) and insulators (\( 10^{-11} \) to \( 10^{-19} \, \text{S} \, \text{m}^{-1} \)).

Higher than metals
Intermediate to metals and insulators
Lower than insulators
Equal to metals
2

Chemistry

Which method is used to detect phosphorus in an organic compound by converting it to phosphate?

In the Carius method, phosphorus is oxidized with \( \ce{HNO3} \) to form \( \ce{H3PO4} \), which is precipitated as ammonium phosphomolybdate.

Carius method
Lassaigne’s test
Kjeldahl’s method
Dumas method
1

In which molecule does the central atom use \( sp^2 \) hybridization with three bonds?

In \( \ce{SO3} \), sulfur forms 3 double bonds, requiring 3 hybrid orbitals, achieved by \( sp^2 \) hybridization.

\( \ce{CH4} \)
\( \ce{NH3} \)
\( \ce{SO3} \)
\( \ce{PF5} \)
3

The vapor pressure of pure water at 300 K is 25 mm Hg. What is the vapor pressure of a solution containing 18 g of glucose (\( \ce{C6H12O6} \)) in 162 g of water? (Molar mass: \( \ce{C6H12O6} = 180 \, \text{g/mol} \))

Moles of glucose = \( \frac{18}{180} = 0.1 \, \text{mol} \).

Moles of water = \( \frac{162}{18} = 9 \, \text{mol} \).

Mole fraction of water = \( \frac{9}{9 + 0.1} = 0.989 \).

Vapor pressure = \( 0.989 \times 25 = 24.73 \, \text{mm Hg} \).

25.00 mm Hg
24.73 mm Hg
23.50 mm Hg
22.00 mm Hg
2

Which type of halide is more resistant to nucleophilic substitution?

Aryl halides resist nucleophilic substitution due to resonance stabilization of the C-X bond.

Alkyl halides
Allyl halides
Aryl halides
Benzylic halides
3

What is the product of the reaction between benzophenone and hydrazine in basic medium?

Wolff-Kishner reduction of benzophenone using hydrazine in a basic medium converts the ketone to diphenylmethane.

Benzyl alcohol
Diphenylmethane
Benzophenone oxime
Benzyl chloride
2

In the Carius method, 0.25 g of a compound gave 0.574 g of \( \ce{AgBr} \). What is the percentage of bromine? (Atomic masses: Ag = 108, Br = 80)

Molar mass of \( \ce{AgBr} = 108 + 80 = 188 \) g/mol. Mass of Br = \( \frac{80 \times 0.574}{188} = 0.244 \) g. Percentage = \( \frac{0.244 \times 100}{0.25} = 97.6\% \).

95.0%
96.0%
97.0%
97.6%
4

How many grams of CO are produced from 28 g of C reacting with 32 g of O₂? (Atomic masses: C = 12, O = 16)

Reaction: \( \ce{2C + O2 -> 2CO} \).

Moles: C = 28 / 12 = 2.333, O₂ = 32 / 32 = 1.

2 mol C require 1 mol O₂. Limiting reagent = O₂.

Mass of CO = 1 × (2 × 28) / 1 = 56 g.

28 g
56 g
44 g
60 g
2

For \( \ce{CH4(g) + H2O(g) <=> CO(g) + 3H2(g)} \), how will increasing pressure affect the equilibrium?

\( \Delta n = (1 + 3) - (1 + 1) = 2 \). Increasing pressure favors the side with fewer moles (reactants), shifting left.

Shift to products
No effect
Increase \( K_p \)
Shift to reactants
4

Calculate \(\Delta_r H\) for \(\ce{CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l)}\) using \(\Delta_f H^\circ\): CH₄(g) = -74.8 kJ/mol, CO₂(g) = -393.5 kJ/mol, H₂O(l) = -285.8 kJ/mol.

\(\Delta_r H = [(-393.5) + 2(-285.8)] - [(-74.8) + 0] = -964.1 + 74.8 = -889.3 kJ/mol\).

-814.5 kJ/mol
-964.1 kJ/mol
-74.8 kJ/mol
-889.3 kJ/mol
4

Which reagent is used to test for primary and secondary alcohols?

Chromic acid (H2CrO4) oxidizes primary alcohols to aldehydes and secondary alcohols to ketones, producing a color change.

Tollens’ reagent
Lucas reagent
Chromic acid
Brady’s reagent
3

The second ionization enthalpy is always higher than the first because:

Removing an electron from a positive ion (X⁺) requires more energy due to increased effective nuclear charge and reduced electron repulsion.

It involves removing an electron from a cation
The atomic radius increases
The nuclear charge decreases
Shielding effect increases
1

What is the pH of a 0.003 M \( \ce{NaOH} \) solution, assuming complete dissociation?

\( [\ce{OH-}] = 0.003 \) M, \( \text{pOH} = -\log(0.003) \approx 2.52 \).

\( \text{pH} = 14 - 2.52 = 11.48 \approx 11.5 \).

12.0
11.5
2.5
10.0
2

Which of the following statements about alkanes is correct?

Alkanes are also called paraffins because they are chemically less reactive under normal conditions.

They are highly reactive
They contain multiple bonds
They are also called paraffins
They are soluble in water
3

A reaction’s rate increases by a factor of 16 when [A] is doubled and [B] is doubled. If the order with respect to A is 2, what is the order with respect to B?

Rate = \( k[\ce{A}]^n[\ce{B}]^m \), \( n = 2 \), \( 16 = 2^2 \times 2^m \).

\( 16 = 4 \times 2^m \), \( 2^m = 4 \), \( m = 2 \).

1
3
2
4
3

Which of the following has a resonance structure with two equivalent oxygen-nitrogen bonds?

\( \ce{NO2^-} \) has two equivalent resonance structures, each with one double and one single N-O bond, averaging to equivalent bonds.

\( \ce{H2O} \)
\( \ce{NH3} \)
\( \ce{CH4} \)
\( \ce{NO2^-} \)
4

Which amine produces a yellow oily compound on reaction with \( \ce{HNO2} \)?

Secondary amines like \( \ce{(CH3CH2)2NH} \) react with \( \ce{HNO2} \) to form yellow oily N-nitrosoamines (\( \ce{(CH3CH2)2N-N=O} \)), unlike primary or tertiary amines.

\( \ce{CH3CH2NH2} \)
\( \ce{(CH3)3N} \)
\( \ce{C6H5NH2} \)
\( \ce{(CH3CH2)2NH} \)
4

Which of the following compounds can undergo decarboxylation most easily?

β-Keto acids undergo decarboxylation easily due to the stability of the enolate intermediate.

Acetic acid
Benzoic acid
Oxalic acid
β-Keto acid
4

Which of the following actinoids exhibits a +5 oxidation state?

Protactinium (Pa, Z = 91) shows +5 (e.g., \( \ce{PaO2^+} \)), common among early actinoids.

Th
Pa
Am
Lr
2

For \( \ce{NH3(g) + HCl(g) <=> NH4Cl(s)} \), increasing temperature will:

This is an exothermic reaction (solid formation). Increasing temperature shifts equilibrium to reactants (dissociation).

Shift to reactants
Shift to products
Increase \( K_p \)
No effect
1

How many valence electrons are contributed by nitrogen in the \( \ce{NH3} \) molecule?

Nitrogen has 5 valence electrons (\( 2s^2 2p^3 \)), which it contributes to \( \ce{NH3} \) for bonding and lone pairs.

5
3
7
2
1

What is \(\Delta H\) for \(\ce{CH3COCH3(l) + 4O2(g) -> 3CO2(g) + 3H2O(l)}\) if \(\Delta_f H^\circ\): CH₃COCH₃(l) = -248 kJ/mol, CO₂(g) = -393.5 kJ/mol, H₂O(l) = -285.8 kJ/mol?

\(\Delta_r H = [3(-393.5) + 3(-285.8)] - [-248 + 0] = -1180.5 - 857.4 + 248 = -1789.9 kJ/mol\).

-1541.9 kJ/mol
-1789.9 kJ/mol
-2037.9 kJ/mol
-1293.9 kJ/mol
2

Which of the following 3d series elements is used in dry battery cells?

Manganese (Mn) in \( \ce{MnO2} \) is used in dry battery cells as a cathode material.

Fe
Cu
Ni
Mn
4

What volume of 1.5 M HNO₃ is required to react with 4 g of NaOH? (Molar mass of NaOH = 40 g/mol)

Reaction: \( \ce{HNO3 + NaOH -> NaNO3 + H2O} \).

Moles of NaOH = 4 / 40 = 0.1 mol.

1 mol NaOH requires 1 mol HNO₃. Volume = 0.1 / 1.5 ≈ 0.0667 L ≈ 66.7 mL.

50 mL
66.7 mL
75 mL
100 mL
2

Which of the following compounds is least soluble in water?

The solubility of alcohols in water decreases as the size of the alkyl group increases due to increased hydrophobic interactions.

Methanol
Ethanol
Butanol
Pentanol
4

Which complex produces 2 moles of \( \ce{AgCl} \) per mole when treated with excess \( \ce{AgNO3} \)?

\( \ce{[Co(NH3)5Cl]Cl2} \) has 2 ionizable \( \ce{Cl^-} \) ions outside the coordination sphere, yielding 2 moles of \( \ce{AgCl} \), while the inner \( \ce{Cl} \) is non-ionizable.

\( \ce{[Co(NH3)5Cl]Cl2} \)
\( \ce{[Co(NH3)6]Cl3} \)
\( \ce{[CoCl2(NH3)4]Cl} \)
\( \ce{[PtCl2(NH3)2]} \)
1

Which element has 4 electrons in its \(3d\) subshell?

Configuration \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^2\) has 24 electrons (chromium, Z = 24, but typically \(3d^5 4s^1\)). Titanium (Z = 22) has \(3d^2 4s^2\), so we consider an excited state or ion context, but ground state \(3d^4\) aligns with Cr before exception: Z = 24.

Scandium
Titanium
Chromium
Vanadium
3

A gas dissolves in water with a solubility of 0.005 mol/L at a partial pressure of 0.5 bar at 298 K. What is the Henry's law constant (\( K_H \)) in bar?

Henry's law: \( p = K_H \cdot \text{solubility (in molarity)} \).

\( K_H = \frac{p}{\text{solubility}} = \frac{0.5}{0.005} = 100 \, \text{bar} \).

100 bar
50 bar
200 bar
25 bar
1

Bond enthalpy of N–H is 389 kJ/mol. Calculate \(\Delta H\) for \(\ce{NH3(g) -> NH2(g) + H(g)}\).

\(\ce{NH3}\) has 3 N–H bonds; \(\ce{NH2}\) has 2 N–H. \(\Delta H = [389] - [0] = 389 kJ/mol\).

778 kJ/mol
1167 kJ/mol
194.5 kJ/mol
389 kJ/mol
4

In a lead storage battery during charging, what is the product formed at the cathode?

During charging, the reaction is reversed: \( \ce{PbSO4 + 2e- -> Pb + SO4^2-} \) at the cathode.

Product: Pb(s).

Pb(s)
PbO₂(s)
PbSO₄(s)
H₂SO₄
1

Which lanthanoid has a melting point of 1623 K, higher than the typical range?

Samarium (Sm, Z = 62) melts at 1623 K, exceeding the usual 1000-1200 K range for lanthanoids.

Ce
Gd
Sm
Lu
3

The deficiency of which vitamin causes night blindness?

Vitamin A is essential for rhodopsin formation in the retina; its deficiency leads to night blindness.

Vitamin C
Vitamin A
Vitamin D
Vitamin K
2

Which complex is diamagnetic?

\( \ce{[Ni(CN)4]^{2-}} \) has Ni²⁺ (\( d^8 \)), and with strong field \( \ce{CN^-} \) ligands in a square planar geometry (\( dsp^2 \)), all electrons pair up, resulting in 0 unpaired electrons, making it diamagnetic.

\( \ce{[Fe(H2O)6]^{2+}} \)
\( \ce{[Ni(CN)4]^{2-}} \)
\( \ce{[CoF6]^{3-}} \)
\( \ce{[MnCl6]^{3-}} \)
2

A first-order reaction has a half-life of 20 minutes. What is the time required for 75% decomposition?

\( k = \frac{0.693}{20} = 0.03465 \, \ce{min^{-1}} \).

75% decomposed, 25% remains: \( t = \frac{2.303}{0.03465} \log 4 = 40 \, \ce{min} \).

40 min
30 min
60 min
20 min
1

The reaction \( \ce{2X -> Y} \) has an average rate of formation of Y as \( 4.0 \times 10^{-4} \, \ce{mol L^{-1} min^{-1}} \). What is the rate of disappearance of X in the same units?

Rate = \( -\frac{1}{2} \frac{\Delta[\ce{X}]}{\Delta t} = \frac{\Delta[\ce{Y}]}{\Delta t} \).

\( \frac{\Delta[\ce{Y}]}{\Delta t} = 4.0 \times 10^{-4} \), so \( -\frac{\Delta[\ce{X}]}{\Delta t} = 2 \times 4.0 \times 10^{-4} = 8.0 \times 10^{-4} \).

\( 8.0 \times 10^{-4} \)
\( 4.0 \times 10^{-4} \)
\( 2.0 \times 10^{-4} \)
\( 1.0 \times 10^{-4} \)
1

In the reaction \( \ce{2Na + 2H2O -> 2NaOH + H2} \), what is the oxidation state change for Na?

Na goes from 0 in elemental form to +1 in \( \ce{NaOH} \), an increase of +1, indicating oxidation.

0 to -1
-1 to +1
0 to +1
+1 to 0
3

Which reaction is used for the conversion of alkyl halides to alkanes?

Wurtz reaction involves the reaction of alkyl halides with sodium metal in dry ether to form alkanes.

Wurtz reaction
Kolbe’s reaction
Cannizzaro reaction
Aldol condensation
1

Which of the following reagents is used for the decarboxylation of carboxylic acids?

Soda lime (\(\ce{NaOH + CaO}\)) is commonly used to remove the carboxyl group from carboxylic acids, forming hydrocarbons.

Zn-Hg/HCl
NaBH4
Soda lime
DIBAL-H
3

What is the main product when ethene reacts with \( \ce{Br2} \) in \( \ce{CCl4} \)?

Ethene reacts with bromine in \( \ce{CCl4} \) to form 1,2-dibromoethane.

\( \ce{CH2Br-CH2Br} \)
\( \ce{CH3CH2Br} \)
\( \ce{CH2=CHBr} \)
Bromoform
1

How many grams of O₂ are produced from 49 g of H₂O₂ in the reaction \( \ce{2H2O2 -> 2H2O + O2} \)? (Atomic masses: H = 1, O = 16)

Molar mass of H₂O₂ = 34 g/mol.

Moles of H₂O₂ = 49 / 34 ≈ 1.441 mol.

2 mol H₂O₂ produce 1 mol O₂. Moles of O₂ = 1.441 / 2 ≈ 0.7205 mol.

Mass = 0.7205 × 32 ≈ 23.06 g ≈ 23 g.

16 g
20 g
23 g
24 g
3

What is the product when \( \ce{(CH3)2CHNH2} \) reacts with excess \( \ce{CH3I} \) followed by \( \ce{AgOH} \)?

Propan-2-amine with excess \( \ce{CH3I} \) forms a quaternary salt (\( \ce{(CH3)2CHN(CH3)3+I-} \)), which with \( \ce{AgOH} \) undergoes elimination to yield \( \ce{(CH3)2CHN(CH3)2} \).

\( \ce{(CH3)2CHNHCH3} \)
\( \ce{(CH3)3N} \)
\( \ce{(CH3)2CHNH2} \)
\( \ce{(CH3)2CHN(CH3)2} \)
4

What is the number of unpaired electrons in \( \ce{[Mn(H2O)6]^{2+}} \)?

Mn²⁺ (\( d^5 \)) with weak field \( \ce{H2O} \) in an octahedral field is high spin (\( t_{2g}^3 e_g^2 \)), with 5 unpaired electrons.

2
3
4
5
4

What is the atomic number of an element with 3 electrons in its \(2p\) subshell?

Configuration up to \(2p\) with 3 electrons: \(1s^2 2s^2 2p^3\). Total electrons = \(2 + 2 + 3 = 7\), so \(Z = 7\) (nitrogen).

6
7
8
5
2

What is the mass of nickel deposited at the cathode when a 5 A current flows through Ni(NO₃)₂ solution for 20 minutes? (Molar mass of Ni = 58.7 g/mol, F = 96500 C/mol)

\( Q = 5 \times 1200 = 6000 \, \text{C} \).

For Ni²⁺ + 2e⁻ → Ni(s), 2F (193000 C) deposits 58.7 g.

Mass = \( \frac{58.7 \times 6000}{193000} \approx 1.824 \, \text{g} \).

0.912 g
3.648 g
1.467 g
1.824 g
4

What is the total number of sigma (\( \sigma \)) bonds in \( \ce{CH3CH2OCH3} \)?

In \( \ce{CH3CH2OCH3} \), there are 9 single bonds: 8 C-H, 1 C-C, and 2 C-O. Each single bond is a sigma bond, totaling 9.

8
9
10
7
2

Which element in the third period has the smallest atomic radius?

Atomic radius decreases across a period. In the third period (Na to Ar), Cl has the smallest radius due to highest nuclear charge.

Na
Mg
Cl
Si
3

Botany

Pollination in flowering plants is defined as:

The fusion of gametes
Transfer of pollen from the anther to the stigma
Development of the ovule into an embryo
Seed dispersal by wind
2

Pollination is the process of transferring pollen from the anther (male part) to the stigma (female part) of a flower.

Which component of xylem is responsible for the conduction of water?

Phloem fibers
Tracheids
Sieve tubes
Companion cells
2

Tracheids are elongated cells in xylem responsible for conducting water in vascular plants.

Which of the following is an example of secondary succession?

Lichen colonizing bare rocks
Regrowth of a forest after a wildfire
Coral reef formation in deep waters
Bacteria colonizing a new volcanic island
2

Secondary succession occurs when an existing ecosystem is disturbed but soil remains, such as after a wildfire.

Which plant hormone was discovered by observing the effect of a volatile substance from ripened oranges on bananas?

Auxin
Cytokinin
Ethylene
Gibberellin
3

Ethylene was identified when H.H. Cousins observed that a volatile compound from ripened oranges accelerated the ripening of bananas.

Which of the following is an incorrect statement about species richness?

Species richness is highest in tropical rainforests.
Species richness increases toward the poles.
Higher species richness improves ecosystem resilience.
Species richness is an important measure of biodiversity.
2

Species richness is highest in tropical regions and decreases toward the poles due to harsher climatic conditions.

Which plant hormone is used to promote root formation in stem cuttings?

Gibberellin
Auxin
Cytokinin
Abscisic acid
2

Auxins, such as IAA and IBA, are used to promote root formation in stem cuttings for plant propagation.

What is the role of crossing over during meiosis?

Prevents genetic variation
Increases genetic diversity
Ensures mitosis occurs properly
Maintains identical copies of genes
2

Crossing over during meiosis increases genetic diversity by exchanging genetic material between homologous chromosomes.

What happens during the regeneration phase of the Calvin cycle?

RuBP is synthesized
ATP and NADPH are used to fix CO₂
Oxygen is released
Glucose is formed
1

During the regeneration phase, RuBP is regenerated using ATP, allowing the Calvin cycle to continue.

Which of the following statements about phyllotaxy is incorrect?

Alternate phyllotaxy is found in sunflower
Whorled phyllotaxy is seen in Alstonia
Opposite phyllotaxy is observed in guava
All plants exhibit opposite phyllotaxy
4

Not all plants exhibit opposite phyllotaxy; different plants exhibit different types such as alternate, opposite, or whorled.

Which molecule is regenerated at the end of the Krebs cycle?

Citrate
Acetyl-CoA
Oxaloacetate
Pyruvate
3

Oxaloacetate is regenerated at the end of the Krebs cycle to continue the cycle.

What is the function of bundle sheath cells in vascular bundles?

Water absorption
Mechanical support
Regulation of water loss
Storage of starch
2

Bundle sheath cells in vascular bundles provide mechanical support to vascular tissues.

In which type of placentation are ovules attached to the central axis of a multilocular ovary?

Marginal
Axile
Parietal
Basal
2

Axile placentation occurs when ovules are attached to the central axis, as seen in tomato and china rose.

Which of the following statements about diatoms is correct?

Diatoms lack a nucleus.
Diatoms have silica-embedded cell walls.
Diatoms reproduce only sexually.
Diatoms do not contribute to oxygen production.
2

Diatoms have silica-embedded cell walls, making them ecologically significant in aquatic environments.

Which scientist proposed the Chromosomal Theory of Inheritance?

Gregor Mendel
Thomas Hunt Morgan
Sutton and Boveri
Watson and Crick
3

Sutton and Boveri proposed the Chromosomal Theory of Inheritance, linking Mendel’s principles to chromosome behavior.

Which feature of the genetic code ensures that an amino acid can be coded by more than one codon?

Universality
Non-overlapping nature
Degeneracy
Specificity
3

Degeneracy of the genetic code means that multiple codons can specify the same amino acid.

Which of the following statements about stem modifications is incorrect?

Rhizomes store food and help in vegetative propagation
Thorns in citrus plants are modified leaves
Tubers are underground modified stems
Tendrils in pumpkins are modified stems
2

Thorns in citrus plants are modified stems, not leaves. They protect the plant from herbivores.

Which of the following is an example of intraspecific competition?

Lions and hyenas competing for food
Two male deer fighting for a mate
A shark hunting a seal
Barnacles and mussels competing for space
2

Intraspecific competition occurs between members of the same species, such as two male deer competing for a mate.

Which of the following statements about meiosis is incorrect?

Meiosis results in four haploid cells
Meiosis increases genetic variation
Meiosis is a type of asexual reproduction
Crossing over occurs during meiosis
3

Meiosis is a type of sexual reproduction, not asexual reproduction.

Which of the following proteins helps in the unwinding of supercoiled DNA?

Helicase
Topoisomerase
DNA polymerase
Ligase
2

Topoisomerase relieves supercoiling tension in DNA by cutting and rejoining strands.

Why do monocot plants typically lack secondary growth?

They do not have a vascular cambium
They lack phloem and xylem
Their roots do not develop
They do not require additional support
1

Monocot plants lack vascular cambium, which is responsible for secondary growth in dicots.

Which of the following is NOT a reason for conserving biodiversity?

Narrowly utilitarian values
Broadly utilitarian values
Ethical values
Monetary inflation
4

Monetary inflation is unrelated to biodiversity conservation, whereas utilitarian and ethical values justify conservation efforts.

Which of the following statements about mitochondria is correct?

Mitochondria are present only in plant cells.
Mitochondria have a single membrane.
Mitochondria are known as the powerhouse of the cell.
Mitochondria contain 80S ribosomes.
3

Mitochondria are known as the powerhouse of the cell because they produce ATP through aerobic respiration.

Which of the following is an incorrect statement about the light-independent reactions?

They occur in the stroma of the chloroplast.
ATP and NADPH from light reactions are used.
Carbon dioxide is fixed into organic molecules.
Oxygen is released as a by-product.
4

Oxygen is released during the light-dependent reactions, not the light-independent reactions.

Which of the following statements about nectaries in flowers is correct?

Nectaries secrete nectar to attract pollinators, thus playing a key role in cross-pollination.
Nectaries produce pollen grains.
Nectaries are found exclusively in wind-pollinated flowers.
Nectaries inhibit pollinator visits by emitting repulsive chemicals.
1

Nectaries are specialized structures that produce nectar, which attracts pollinators and facilitates effective cross-pollination.

Which of the following taxonomic categories includes the maximum number of species?

Order
Genus
Class
Kingdom
4

Kingdom is the highest taxonomic rank and includes the maximum number of species.

What is the first stable product formed in the Calvin cycle?

RuBP
3-PGA (3-phosphoglyceric acid)
G3P (Glyceraldehyde-3-phosphate)
Oxaloacetic acid
2

3-PGA is the first stable product of carbon fixation in the Calvin cycle.

Which protein binds to the operator region to prevent transcription in the lac operon?

RNA polymerase
Repressor protein
Activator protein
Sigma factor
2

The repressor protein binds to the operator region in the lac operon to block transcription in the absence of lactose.

Which of the following statements about species richness is true?

It remains constant across latitudes
It is higher in temperate regions
It is highest in tropical regions
It is independent of climate
3

Species richness is highest in the tropics due to stable climate and higher availability of resources.

What is a key difference between meiosis I and meiosis II?

DNA replication occurs in meiosis I but not in meiosis II
Homologous chromosomes separate in meiosis II, not in meiosis I
Meiosis I produces haploid cells, while meiosis II produces diploid cells
Cytokinesis occurs only in meiosis I
1

DNA replication occurs only in meiosis I during the S phase, not in meiosis II, which is similar to mitosis.

Which of the following is a correct statement about biological magnification?

Toxins decrease at higher trophic levels
Toxins accumulate and increase in concentration at higher trophic levels
Biological magnification does not affect top predators
It has no relation to human activities
2

Biological magnification causes toxins to accumulate and increase in concentration at higher trophic levels, affecting top predators.

What is the genetic cause of sickle-cell anemia?

Trisomy of chromosome 21
Substitution of glutamic acid by valine in hemoglobin
Deletion of X chromosome
Duplication of the HBB gene
2

Sickle-cell anemia is caused by a single base substitution in the β-globin gene, leading to the replacement of glutamic acid with valine.

Which of the following correctly describes a nonsense mutation?

It results in an amino acid substitution.
It leads to a premature stop codon.
It does not affect protein function.
It causes a frameshift in the reading frame.
2

A **nonsense mutation introduces a premature stop codon**, leading to an incomplete protein.

Which microorganism is responsible for the production of lactic acid in dairy products?

Saccharomyces cerevisiae
Lactobacillus
Clostridium butylicum
Aspergillus niger
2

Lactobacillus bacteria ferment lactose into lactic acid, aiding in curd and yogurt formation.

Which biome is expected to have the lowest primary productivity?

Tropical rainforest
Coral reefs
Tundra
Mangroves
3

The tundra biome has the lowest primary productivity due to low temperatures and short growing seasons.

Which of the following intermediates of respiration is involved in amino acid synthesis?

Pyruvate
Citrate
α-Ketoglutaric acid
Fumarate
3

α-Ketoglutaric acid is an intermediate of the Krebs cycle that serves as a precursor for amino acid synthesis.

Which type of root modification provides mechanical support in maize and sugarcane?

Tuberous roots
Prop roots
Pneumatophores
Stilt roots
4

Stilt roots arise from lower nodes and provide mechanical support in plants like maize and sugarcane.

Which component of the cytoskeleton is responsible for intracellular transport?

Microfilaments
Intermediate filaments
Microtubules
Centrioles
3

Microtubules form tracks along which organelles and vesicles move within the cell, facilitating intracellular transport.

Which of the following statements about lichens is incorrect?

Lichens are a symbiotic association of fungi and algae.
Lichens are highly sensitive to air pollution.
Lichens grow well in highly polluted areas.
Lichens contribute to soil formation by breaking down rocks.
3

Lichens are highly sensitive to air pollution and do not grow in highly polluted areas.

Which of the following is incorrect about histones?

Histones help in DNA packaging.
Histones are positively charged proteins.
Histones are found in both prokaryotic and eukaryotic cells.
Histones form nucleosomes by wrapping DNA.
3

Histones are **only found in eukaryotic cells**, as **prokaryotic DNA lacks histones**.

What marks the transition from metaphase to anaphase in mitosis?

Condensation of chromosomes
Spindle fiber formation
Separation of sister chromatids
Disintegration of nucleolus
3

During the transition from metaphase to anaphase, sister chromatids separate and begin moving to opposite poles.

Which of the following statements about the plasma membrane is correct?

The plasma membrane is permeable to all molecules.
The plasma membrane is made of a phospholipid bilayer with embedded proteins.
The plasma membrane produces enzymes for digestion.
The plasma membrane is composed of only proteins.
2

The plasma membrane is composed of a phospholipid bilayer with embedded proteins, making it selectively permeable.

Which term describes the process of inserting foreign DNA into a host organism using a vector?

Gene therapy
Recombinant DNA technology
Mutation
Genetic drift
2

Recombinant DNA technology involves inserting foreign DNA into a host using a vector for genetic modification.

Which of the following is a correct statement about sex-linked inheritance?

Y-linked traits can be passed to both male and female offspring.
X-linked recessive disorders are more common in males.
Females can never be carriers of X-linked disorders.
X-linked dominant traits only affect males.
2

Since males have only one X chromosome, X-linked recessive disorders are more common in them.

Which of the following correctly describes a test cross?

A cross between two dominant individuals.
A cross between an individual of unknown genotype and a homozygous recessive individual.
A cross between two heterozygous individuals.
A cross between two recessive individuals.
2

A test cross helps determine an organism’s genotype by crossing it with a homozygous recessive individual.

Which of the following statements about Phaeophyceae is correct?

Phaeophyceae lack chlorophyll and rely on carotenoids alone.
Their color varies from olive green to brown due to fucoxanthin.
Phaeophyceae store food as starch in pyrenoids.
They reproduce asexually only by non-motile spores.
2

The color of Phaeophyceae varies from olive green to brown due to the presence of fucoxanthin.

Zoology

Which protein produced by transgenic animals is used to treat cystic fibrosis?

Interferon
Alpha-1-antitrypsin
Insulin
Growth hormone
2

Alpha-1-antitrypsin produced by transgenic animals is used in the treatment of cystic fibrosis.

Which component in tissue culture media provides energy to growing plant cells?

Vitamins
Amino acids
Sucrose
Mineral salts
3

Sucrose provides the energy required for the growth and development of plant cells in tissue culture media.

What type of immune response is responsible for graft rejection?

Humoral immunity
Cell-mediated immunity
Innate immunity
Passive immunity
2

Graft rejection is mediated by cell-mediated immunity, which involves T-lymphocytes recognizing and attacking foreign tissues.

Which of the following is incorrect?

Industrial melanism is an example of natural selection.
Coelacanth is an extinct species.
Mutations can be beneficial, harmful, or neutral.
Fossils provide evidence for evolutionary relationships.
2

Coelacanth is not extinct; it is considered a living fossil, showing minimal evolutionary change.

Which of the following is correct about Golden Rice?

Golden Rice is genetically modified to produce high protein content.
Golden Rice is genetically modified to produce beta-carotene.
Golden Rice is used for nitrogen fixation in soil.
Golden Rice is resistant to fungal infections.
2

Golden Rice is genetically modified to produce beta-carotene, which helps combat vitamin A deficiency.

Which of the following statements about Phylum Porifera is correct?

They have a tissue-level organization
They exhibit intracellular digestion
They have a complete digestive system
They possess cnidoblasts
2

Sponges (Phylum Porifera) exhibit intracellular digestion as they lack a digestive cavity.

Which of the following statements about lung function is correct?

Lung expansion is caused by contraction of the pleura.
Air moves into the lungs when intrapulmonary pressure is lower than atmospheric pressure.
Gas exchange occurs primarily in the bronchi.
Expiration is caused by contraction of the diaphragm.
2

Inhalation occurs when intrapulmonary pressure falls below atmospheric pressure, allowing air to flow into the lungs.

Which type of cancer is characterized by the uncontrolled proliferation of white blood cells?

Carcinoma
Sarcoma
Leukemia
Lymphoma
3

Leukemia is a type of blood cancer in which abnormal white blood cells multiply uncontrollably.

Which of the following is the causative agent of filariasis?

Ascaris lumbricoides
Plasmodium vivax
Wuchereria bancrofti
Entamoeba histolytica
3

Filariasis is caused by the filarial worm Wuchereria bancrofti, which affects the lymphatic system.

Which of the following statements about transformation is correct?

Transformation is the uptake of foreign DNA by bacterial cells.
Transformation requires viral infection.
Transformation cannot occur naturally.
Transformation does not involve recombinant DNA technology.
1

Transformation is the process of introducing foreign DNA into bacterial cells, either naturally or artificially.

Which structure in male frogs produces sperm?

Kidney
Testes
Oviduct
Ureter
2

The testes in male frogs produce sperm, which is transported through the urinogenital ducts.

Which feature allows plasmids to be used as vectors in genetic engineering?

They are single-stranded
They integrate into the host genome
They replicate independently
They always carry antibiotic resistance genes
3

Plasmids are widely used as vectors because they replicate independently of the host chromosome, allowing gene cloning.

Which of the following statements about birds is incorrect?

They have pneumatic (hollow) bones
They excrete urea as their primary nitrogenous waste
They have a four-chambered heart
They are oviparous
2

Birds are uricotelic, meaning they excrete uric acid, not urea.

What is the role of competitive inhibitors in enzyme activity?

They increase enzyme activity
They bind to the active site of the enzyme
They permanently disable the enzyme
They bind to a site other than the active site
2

Competitive inhibitors compete with the substrate for the enzyme’s active site, reducing enzyme activity.

What is the primary function of cerebrospinal fluid (CSF)?

Facilitates nerve impulse conduction
Provides cushioning and removes metabolic waste
Acts as a neurotransmitter
Transmits signals between neurons
2

Cerebrospinal fluid (CSF) cushions the brain and spinal cord while also removing metabolic waste.

Which principle is based on the binomial expansion (p + q)² = 1?

Law of Independent Assortment
Hardy-Weinberg Principle
Law of Segregation
Mutation Theory
2

Hardy-Weinberg Principle is based on the binomial expansion (p + q)² = 1, representing allele frequency stability in a population.

Which of the following is incorrect?

Gene flow can introduce new alleles into a population.
Adaptive radiation results in species diversity from a common ancestor.
Coelacanth is considered a living fossil.
Hardy-Weinberg equilibrium describes continuous changes in allele frequencies.
4

Hardy-Weinberg equilibrium describes the stability of allele frequencies in the absence of evolutionary forces.

What is the function of the parasympathetic nervous system?

Prepares the body for stress and emergencies
Regulates voluntary muscle movements
Promotes relaxation and energy conservation
Stimulates the release of adrenaline
3

The parasympathetic nervous system promotes relaxation, digestion, and energy conservation.

Which of the following statements is correct?

Genetic recombination decreases genetic diversity in populations.
Mutation is the only source of genetic variation.
Homo erectus was the first hominid to use fire.
Hardy-Weinberg equilibrium describes continuous allele frequency changes.
3

Homo erectus is known as the first hominid to use fire, marking an important stage in human evolution.

Which part of the respiratory system is the common passage for food and air?

Larynx
Trachea
Pharynx
Bronchi
3

The pharynx serves as a common passage for both air (to the lungs) and food (to the esophagus).

Which of the following statements about muscle contraction is correct?

Calcium ions play no role in contraction.
ATP is not required for contraction.
Myosin heads form cross-bridges with actin.
Actin filaments shorten during contraction.
3

Myosin heads bind to actin filaments to facilitate contraction​.

Which of the following is incorrect regarding white blood cells?

Neutrophils are the most abundant type of WBCs.
Lymphocytes produce antibodies.
Basophils play a role in allergic reactions.
Erythrocytes are a type of WBC.
4

Erythrocytes (RBCs) are **not WBCs**; they are responsible for **oxygen transport**.

Which of the following elements is a major component of nucleic acids but is not found in carbohydrates?

Carbon
Oxygen
Nitrogen
Hydrogen
3

Nitrogen is a key component of nucleic acids (DNA & RNA) but is absent in carbohydrates.

Which disorder is incorrectly matched with its cause?

Myasthenia gravis - Autoimmune disorder
Osteoporosis - Low estrogen levels
Gout - Uric acid accumulation
Muscular dystrophy - Bacterial infection
4

Muscular dystrophy is a genetic disorder, not caused by bacterial infection​.

Which of the following sexually transmitted infections (STIs) is caused by a bacterial pathogen?

HIV/AIDS
Genital herpes
Gonorrhea
Hepatitis B
3

Gonorrhea is caused by the bacterium *Neisseria gonorrhoeae*, whereas HIV/AIDS, genital herpes, and Hepatitis B are caused by viruses.

Which of the following statements about genetically modified organisms (GMOs) is incorrect?

GMOs are created using recombinant DNA technology.
GMOs can be used in agriculture for pest resistance.
GMOs have no applications in medicine.
GMOs can be used to produce recombinant proteins.
3

GMOs have significant applications in medicine, including the production of insulin and vaccines.

Which class of vertebrates is exclusively viviparous?

Aves
Reptilia
Amphibia
Mammalia
4

Mammals are distinguished by their viviparous nature, meaning they give birth to live young.

In which region of the uterus does implantation most commonly occur?

Uterine fundus
Uterine body
Uterine isthmus
Cervix
1

The uterine fundus, being rich in blood supply, is the most common site for implantation of the blastocyst.

The descending limb of Henle’s loop is:

Permeable to water, impermeable to electrolytes
Impermeable to water, permeable to electrolytes
Permeable to both water and electrolytes
Impermeable to both water and electrolytes
1

The descending limb of Henle’s loop allows water reabsorption but is impermeable to electrolytes.

Which of the following statements about nephron function is correct?

The glomerular filtrate contains blood cells and proteins.
The Loop of Henle is responsible for the ultrafiltration process.
The distal convoluted tubule actively secretes potassium and hydrogen ions.
The collecting duct is involved in glucose reabsorption.
3

The distal convoluted tubule plays a role in acid-base balance by actively secreting potassium and hydrogen ions.

Which of the following conditions is associated with maternal hyperglycemia during pregnancy?

Gestational diabetes
Preeclampsia
Placenta previa
Hyperemesis gravidarum
1

Gestational diabetes is characterized by maternal hyperglycemia and can affect both maternal and fetal outcomes if not managed properly.

Which of the following is an example of a reducing sugar?

Sucrose
Glucose
Starch
Cellulose
2

Glucose is a reducing sugar as it has a free aldehyde or ketone group that can donate electrons.

Which of the following is incorrect about tissue culture in plants?

Tissue culture can regenerate whole plants from a single cell.
Tissue culture produces genetically identical plants.
Tissue culture is limited to flowering plants only.
Tissue culture is performed under sterile conditions.
3

Tissue culture is not limited to flowering plants; it is used for a wide variety of plant species.

Which of the following characteristics is common to both reptiles and birds?

Presence of mammary glands
Possession of scales
Excretion of urea
Cold-blooded nature in all members
2

Both reptiles and birds possess scales, which indicate their evolutionary relationship.

Which of the following is the primary purpose of embryo cryopreservation in assisted reproductive technology?

To allow delayed embryo transfer for future cycles
To increase the fertilization rate
To enhance sperm motility
To induce ovarian hyperstimulation
1

Embryo cryopreservation enables the storage of embryos for future use, allowing flexibility in timing embryo transfer and reducing repeated ovarian stimulation.

Which hormone deficiency leads to excessive urination and dehydration?

Aldosterone
Insulin
Vasopressin
Cortisol
3

A deficiency of vasopressin (ADH) leads to diabetes insipidus, causing excessive urination and dehydration.

Which hormone secreted by the adrenal cortex regulates glucose metabolism?

Aldosterone
Cortisol
Adrenaline
Noradrenaline
2

Cortisol is a glucocorticoid that regulates glucose metabolism by stimulating gluconeogenesis.

Which of the following statements about phospholipids is incorrect?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophobic tails and hydrophilic heads.
Phospholipids store genetic information.
Phospholipids form bilayers in aqueous solutions.
3

Phospholipids are structural components of membranes but do not store genetic information.

Where does the exchange of gases primarily occur in a frog when it is submerged in water?

Buccal cavity
Lungs
Skin
Cloaca
3

When submerged in water, frogs rely on cutaneous respiration, where gas exchange occurs through their moist skin.

Which method is used for large-scale production of recombinant proteins?

Microinjection
Southern blotting
Bioreactors
Northern blotting
3

Bioreactors are used for large-scale production of recombinant proteins under controlled conditions.

Which hormone from the anterior pituitary is essential for stimulating testosterone production in males?

Follicle-stimulating hormone (FSH)
Luteinizing hormone (LH)
Prolactin
GnRH
2

Luteinizing hormone (LH) stimulates Leydig cells in the testes to produce testosterone.

Which type of joint allows movement in multiple directions?

Hinge joint
Ball and socket joint
Pivot joint
Fibrous joint
2

Ball and socket joints, such as the hip and shoulder joints, allow movement in multiple planes.

What is the primary function of the pulmonary artery?

Transport oxygenated blood to the body
Carry deoxygenated blood to the lungs
Supply oxygen to the heart muscle
Return blood from the lungs to the heart
2

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation.

What is the main cause of infertility in many couples?

Lack of physical activity
Congenital and hormonal disorders
Use of oral contraceptives
Excessive carbohydrate intake
2

Congenital disorders, hormonal imbalances, and diseases are common causes of infertility in many couples.

Which of the following statements about lymph nodes is correct?

Lymph nodes produce red blood cells.
Lymph nodes filter pathogens from lymph.
Lymph nodes transport oxygen in the body.
Lymph nodes have no role in the immune system.
2

Lymph nodes filter pathogens and foreign particles from lymph, helping in immune defense.

Performance Summary

Subject Correct
Answers		 Incorrect
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Physics
Chemistry
Botany
Zoology

Overall Score

Score: / 720

Category Details
Total Attempts: / 180
Total Skipped: / 180
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
0
180