NEET Full-Length Mock Test 14

NEET Mock Test - 2026

Test 14

Number Of Questions: 180

Time: 3 hours

Correct answer Carries: 4.

Wrong Answer Carries: -1.

3:00:00

Physics

What happens to the temperature of an ideal gas if its volume doubles at constant pressure?

Charles’ Law states that at constant pressure, \( V / T = \text{constant} \). If volume doubles (\( V_2 = 2V_1 \)), the absolute temperature doubles (\( T_2 = 2T_1 \)).

It halves
It remains the same
It doubles
It triples
3

What is the critical angle for a glass (\( n = 1.52 \)) to air interface?

Critical angle: \( \sin i_c = \frac{n_2}{n_1} \).

Glass (\( n_1 = 1.52 \)), air (\コンパクト n_2 = 1 \)).

\( \sin i_c = \frac{1}{1.52} \approx 0.658 \).

\( i_c = \sin^{-1}(0.658) \approx 41.1^\circ \).

41°
45°
50°
55°
1

A \( 400 \, \text{kg} \) satellite orbits Earth at \( 5 R_E \) from the center. What is its total energy? (\( M_E = 6 \times 10^{24} \, \text{kg}, R_E = 6.4 \times 10^6 \, \text{m}, G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \))

\( E = -\frac{G M_E m}{2 r} \).

\( r = 5 R_E = 3.2 \times 10^7 \, \text{m} \).

\( E = -\frac{6.67 \times 10^{-11} \times 6 \times 10^{24} \times 400}{2 \times 3.2 \times 10^7} \).

\( E = -\frac{1.601 \times 10^{17}}{6.4 \times 10^7} \approx -2.5 \times 10^9 \, \text{J} \).

-2.3 × 10⁹ J
-2.5 × 10⁹ J
-2.7 × 10⁹ J
-2.9 × 10⁹ J
2

What type of charges cannot produce electromagnetic waves?

The document states that neither stationary charges nor charges in uniform motion (steady currents) can produce electromagnetic waves; only accelerated charges can.

Stationary charges
Accelerated charges
Oscillating charges
Charges in circular motion
1

A hydraulic system applies \( 150 \, \text{N} \) on a small piston of area \( 0.015 \, \text{m}^2 \). What force is exerted by a large piston of area \( 0.075 \, \text{m}^2 \)?

Pascal’s law: \( P = \frac{F_1}{A_1} = \frac{F_2}{A_2} \).

\( F_2 = F_1 \times \frac{A_2}{A_1} \).

\( F_1 = 150 \, \text{N} \), \( A_1 = 0.015 \, \text{m}^2 \), \( A_2 = 0.075 \, \text{m}^2 \).

\( F_2 = 150 \times \frac{0.075}{0.015} = 150 \times 5 = 750 \, \text{N} \).

600 N
700 N
750 N
800 N
3

The electric field in the depletion region of a p-n junction is directed from:

The electric field arises from positive ionized donors on the n-side and negative ionized acceptors on the p-side, directed from the n-side (positive) to the p-side (negative).

P-side to n-side
Negative to positive charge
N-side to p-side
Neutral region to junction
3

According to Bohr’s model, what happens when an electron in a hydrogen atom transitions from a higher orbit to a lower orbit?

Bohr’s third postulate states that a photon is emitted with energy equal to the difference between the initial and final energy states.

Electron absorbs energy
Photon is emitted
Electron spirals inward
No energy change occurs
2

The power \( P \) depends on energy \( E \) and time \( t \) as \( P = k E^a t^b \). Given \( [P] = [M L^2 T^{-3}] \), find \( a \) and \( b \).

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

\( [M L^2 T^{-3}] = [M L^2 T^{-2}]^a [T]^b = [M^a L^{2a} T^{-2a+b}] \).

Equate: \( a = 1 \), \( 2a = 2 \Rightarrow a = 1 \), \( -2a + b = -3 \).

\( -2(1) + b = -3 \Rightarrow b = -1 \).

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

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

A wire of length \( 0.8 \, \text{m} \) carrying \( 3 \, \text{A} \) makes an angle of \( 30^\circ \) with a magnetic field of \( 0.6 \, \text{T} \). What is the force on the wire?

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

\( F = 3 \times 0.8 \times 0.6 \times \sin 30^\circ = 2.4 \times 0.6 \times 0.5 = 0.72 \, \text{N} \).

1.44 N
0.72 N
0.36 N
1.08 N
2

Light of wavelength \( 300 \, \text{nm} \) produces a stopping potential of \( 1.5 \, \text{V} \). What is the work function of the metal in eV? (Take \( h c = 1240 \, \text{eV nm} \))

\( E = \frac{h c}{\lambda} = \frac{1240}{300} \approx 4.13 \, \text{eV} \).

\( K_{\max} = e V_0 = 1.5 \, \text{eV} \).

\( \phi_0 = E - K_{\max} = 4.13 - 1.5 = 2.63 \, \text{eV} \).

2.5 eV
2.63 eV
2.7 eV
3.0 eV
2

A spring (\( k = 800 \, \text{N/m} \)) is compressed from \( 0.2 \, \text{m} \) to \( 0.3 \, \text{m} \). What is the work done by the spring force?

Work \( W_s = \frac{1}{2} k (x_i^2 - x_f^2) = \frac{1}{2} \times 800 \times (0.2^2 - 0.3^2) = 400 \times (0.04 - 0.09) = -20 \, \text{J} \).

-25 J
-20 J
-15 J
-10 J
2

What is the wavelength of light in water if its wavelength in air is \( 600 \, \text{nm} \) and the refractive index of water is 1.33?

Wavelength in a medium \( \lambda_m = \frac{\lambda_{\text{air}}}{n} \).

Given \( \lambda_{\text{air}} = 600 \, \text{nm} \), \( n = 1.33 \), \( \lambda_m = \frac{600}{1.33} \approx 451 \, \text{nm} \).

451 nm
500 nm
600 nm
800 nm
1

A platinum wire has a resistance of \( 6 \, \Omega \) at \( 0^\circ \text{C} \) and \( 6.48 \, \Omega \) at \( 100^\circ \text{C} \). What is the temperature coefficient of resistivity?

Use: \( R_t = R_0 [1 + \alpha (T - T_0)] \).

Substitute: \( 6.48 = 6 [1 + \alpha (100 - 0)] \).

Solve: \( 6.48 = 6 + 600\alpha \Rightarrow 600\alpha = 0.48 \Rightarrow \alpha = \frac{0.48}{600} = 8 \times 10^{-4} \, ^\circ\text{C}^{-1} \).

\( 8.0 \times 10^{-4} \, ^\circ\text{C}^{-1} \)
\( 9.0 \times 10^{-4} \, ^\circ\text{C}^{-1} \)
\( 1.0 \times 10^{-3} \, ^\circ\text{C}^{-1} \)
\( 1.2 \times 10^{-3} \, ^\circ\text{C}^{-1} \)
1

A \( 1350 \, \text{kg} \) car turns on a banked road (\( \theta = 25^\circ \)) with radius \( 50 \, \text{m} \) at the optimum speed to avoid friction. What is the speed? (Take \( g = 10 \, \text{m/s}^2 \), \( \tan 25^\circ \approx 0.466 \))

Optimum speed: \( v_0 = \sqrt{rg \tan\theta} \) (no friction contribution).

Substitute: \( r = 50 \, \text{m} \), \( g = 10 \, \text{m/s}^2 \), \( \tan 25^\circ = 0.466 \).

\( v_0^2 = 50 \times 10 \times 0.466 = 500 \times 0.466 = 233 \).

\( v_0 = \sqrt{233} \approx 15.26 \, \text{m/s} \).

14 m/s
15.3 m/s
16.5 m/s
18 m/s
2

Why does the wave theory struggle to explain the propagation of light through a vacuum?

Traditionally, waves require a medium to propagate, and the absence of a medium in a vacuum posed a challenge until the electromagnetic theory showed light as self-sustaining electric and magnetic fields.

Light has no frequency in vacuum
Waves typically need a medium
Light’s amplitude decreases
Vacuum increases light’s speed
2

In an isolated system undergoing an adiabatic process, what remains constant?

In an isolated adiabatic system (\( \Delta Q = 0 \)), no heat or matter is exchanged. The First Law (\( \Delta U = -\Delta W \)) applies, but total energy (internal energy) is conserved if no external work is done (\( \Delta W = 0 \)), making total energy constant.

Temperature
Pressure
Volume
Total energy
4

The forward current in a p-n junction diode increases significantly beyond:

The forward current rises exponentially after the applied voltage exceeds the threshold (cut-in) voltage, reducing the barrier height significantly.

Threshold voltage
Breakdown voltage
Reverse saturation point
Equilibrium potential
1

In an intrinsic semiconductor, the total current is the sum of:

The total current (\( I \)) in an intrinsic semiconductor is the sum of electron current (\( I_e \)) and hole current (\( I_h \)), i.e., \( I = I_e + I_h \).

Diffusion and recombination currents
Drift and recombination currents
Electron and hole currents
Diffusion and drift currents
3

A rod of length 0.8 m moves at 1.5 m/s in a 0.4 T field perpendicular to its length. What is the induced emf?

\( \varepsilon = B l v = 0.4 \times 0.8 \times 1.5 = 0.48 \, \text{V} \).

0.48 V
0.5 V
0.55 V
0.6 V
1

A \( 40 \, \text{V} \) battery with negligible internal resistance is connected to a cubical network of 12 resistors, each \( 4 \, \Omega \). What is the total current?

Equivalent resistance: \( R_{\text{eq}} = \frac{5}{6} R = \frac{5}{6} \times 4 = \frac{20}{6} \approx 3.33 \, \Omega \).

Total current: \( I = \frac{V}{R_{\text{eq}}} = \frac{40}{\frac{20}{6}} = 40 \times \frac{6}{20} = 12 \, \text{A} \).

\( 10.0 \, \text{A} \)
\( 11.0 \, \text{A} \)
\( 12.0 \, \text{A} \)
\( 13.0 \, \text{A} \)
3

A \( 24 \, \text{V} \) battery with negligible internal resistance is connected to a cubical network of 12 resistors, each \( 4 \, \Omega \). What is the total current?

Equivalent resistance: \( R_{\text{eq}} = \frac{5}{6} R = \frac{5}{6} \times 4 = \frac{20}{6} = \frac{10}{3} \approx 3.33 \, \Omega \).

Total current: \( I = \frac{V}{R_{\text{eq}}} = \frac{24}{\frac{10}{3}} = 24 \times \frac{3}{10} = 7.2 \, \text{A} \).

\( 6.0 \, \text{A} \)
\( 6.5 \, \text{A} \)
\( 7.2 \, \text{A} \)
\( 8.0 \, \text{A} \)
3

A cyclist accelerates from \( 6 \, \text{m/s} \) at \( 1.5 \, \text{m/s}^2 \) for \( 5 \, \text{s} \), then decelerates at \( 2 \, \text{m/s}^2 \) until its speed is \( 8 \, \text{m/s} \). What is the total distance covered?

Phase 1: \( v = 6 + 1.5 \cdot 5 = 13.5 \, \text{m/s} \), \( x_1 = 6 \cdot 5 + \frac{1}{2} \cdot 1.5 \cdot (5)^2 = 30 + 18.75 = 48.75 \, \text{m} \).

Phase 2: \( 8 = 13.5 - 2 t \Rightarrow t = 2.75 \, \text{s} \), \( x_2 = 13.5 \cdot 2.75 - \frac{1}{2} \cdot 2 \cdot (2.75)^2 = 37.125 - 7.5625 = 29.5625 \, \text{m} \).

Total = \( 48.75 + 29.5625 = 78.3125 \, \text{m} \approx 78.31 \, \text{m} \).

75 m
78.31 m
80 m
76 m
2

A solid sphere of mass \( 2 \, \text{kg} \) and radius \( 0.1 \, \text{m} \) has an angular momentum of \( 4 \, \text{kg m}^2/\text{s} \) about its axis. What is its angular velocity?

\( L = I \omega \).

For a sphere: \( I = \frac{2}{5} M R^2 = \frac{2}{5} \times 2 \times (0.1)^2 = 0.008 \, \text{kg m}^2 \).

\( \omega = \frac{L}{I} = \frac{4}{0.008} = 500 \, \text{rad/s} \).

400 rad/s
450 rad/s
500 rad/s
550 rad/s
3

Why does an AC circuit with only an inductor exhibit a "wattless" current?

In a purely inductive AC circuit, the current lags the voltage by 90°. The power factor (\( \cos 90^\circ = 0 \)) is zero, meaning no average power is dissipated; the current is "wattless" because it only stores and releases energy without consuming it.

Because the inductor has high resistance
Because the phase difference is 90°
Because the current is constant
Because the voltage is zero
2

The magnetic potential energy of a dipole with \( m = 0.9 \, \text{A m}^2 \) in a field \( B = 0.2 \, \text{T} \) at \( 90^\circ \) is:

\( U_m = -m B \cos\theta \).

Given: \( m = 0.9 \, \text{A m}^2 \), \( B = 0.2 \, \text{T} \), \( \theta = 90^\circ \), \( \cos 90^\circ = 0 \).

Substitute: \( U_m = -0.9 \times 0.2 \times 0 = 0 \, \text{J} \).

0 J
-0.18 J
0.18 J
-0.09 J
1

A light source emits \( 6.0 \times 10^{15} \) photons per second with a power of \( 3.0 \, \text{mW} \). What is the energy of each photon in joules?

\( E = \frac{P}{N} = \frac{3.0 \times 10^{-3}}{6.0 \times 10^{15}} = 5.0 \times 10^{-19} \, \text{J} \).

5.0 × 10⁻¹⁹ J
5.5 × 10⁻¹⁹ J
6.0 × 10⁻¹⁹ J
6.5 × 10⁻¹⁹ J
1

What is the nuclear density of a nucleus with mass \( 2.33 \times 10^{-27} \, \text{kg} \) and radius \( 1.7 \times 10^{-15} \, \text{m} \)? (Use \( \pi = 3.14 \))

Density = \( \frac{\text{mass}}{\text{volume}} \), Volume = \( \frac{4}{3} \pi R^3 \).

\( R^3 = (1.7 \times 10^{-15})^3 = 4.913 \times 10^{-45} \, \text{m}^3 \).

Volume = \( \frac{4}{3} \times 3.14 \times 4.913 \times 10^{-45} \approx 2.06 \times 10^{-44} \, \text{m}^3 \).

Density = \( \frac{2.33 \times 10^{-27}}{2.06 \times 10^{-44}} \approx 1.13 \times 10^{17} \, \text{kg/m}^3 \).

1.13 × 10¹⁷ kg/m³
1.29 × 10¹⁷ kg/m³
1.50 × 10¹⁷ kg/m³
2.00 × 10¹⁷ kg/m³
1

A force \( \mathbf{F} = 7 \, \hat{\mathbf{i}} + 3 \, \hat{\mathbf{j}} \, \text{N} \) acts at \( \mathbf{r} = -2 \, \hat{\mathbf{i}} + 1 \, \hat{\mathbf{j}} \, \text{m} \). What is the magnitude of the torque about the origin?

\( \mathbf{\tau} = \mathbf{r} \times \mathbf{F} = \begin{vmatrix} \hat{\mathbf{i}} & \hat{\mathbf{j}} & \hat{\mathbf{k}} \\ -2 & 1 & 0 \\ 7 & 3 & 0 \end{vmatrix} = \hat{\mathbf{k}} ((-2) \times 3 - 1 \times 7) = \hat{\mathbf{k}} (-6 - 7) = -13 \, \hat{\mathbf{k}} \, \text{Nm} \).

Magnitude = \( 13 \, \text{Nm} \).

12 Nm
13 Nm
14 Nm
15 Nm
2

A uniform electric field \( E = 5 \times 10^3 \, \text{N/C} \) is along the y-axis. What is the flux through a square of side 40 cm in the xz-plane?

Area vector \( \Delta \mathbf{S} = (0.4)^2 = 0.16 \, \text{m}^2 \) along y-axis.

Flux: \( \phi = \mathbf{E} \cdot \Delta \mathbf{S} = 5 \times 10^3 \times 0.16 = 800 \, \text{Nm}^2/\text{C} \).

\( 800 \, \text{Nm}^2/\text{C} \)
\( 850 \, \text{Nm}^2/\text{C} \)
\( 900 \, \text{Nm}^2/\text{C} \)
\( 950 \, \text{Nm}^2/\text{C} \)
1

What is the magnetic field at a point on the equatorial line of a bar magnet with magnetic moment \( 2 \, \text{A m}^2 \) at a distance of \( 10 \, \text{cm} \) from its center? (Take \( \mu_0 = 4\pi \times 10^{-7} \, \text{T m A}^{-1} \)).

The magnetic field on the equatorial line is \( B = \frac{\mu_0}{4\pi} \frac{m}{r^3} \).

Given: \( m = 2 \, \text{A m}^2 \), \( r = 0.1 \, \text{m} \), \( \frac{\mu_0}{4\pi} = 10^{-7} \, \text{T m A}^{-1} \).

Substitute: \( B = 10^{-7} \times \frac{2}{(0.1)^3} = 10^{-7} \times \frac{2}{0.001} = 2 \times 10^{-4} \, \text{T} \).

1 × 10⁻⁴ T
2 × 10⁻⁴ T
3 × 10⁻⁴ T
4 × 10⁻⁴ T
2

A \( 0.3 \, \text{kg} \) stone is whirled in a horizontal circle of radius \( 1.6 \, \text{m} \) at \( 45 \, \text{rev/min} \). What is the tension? (Take \( g = 10 \, \text{m/s}^2 \))

Angular speed: \( \omega = 45 \times \frac{2\pi}{60} = \frac{3\pi}{2} \, \text{rad/s} \).

\( \omega^2 = \left(\frac{3\pi}{2}\right)^2 = \frac{9\pi^2}{4} \approx 22.21 \).

Tension: \( T = m \omega^2 r = 0.3 \times 22.21 \times 1.6 \).

\( T \approx 0.3 \times 22.21 \times 1.6 \approx 10.66 \, \text{N} \).

9 N
10.7 N
12 N
14 N
2

A train accelerates uniformly from \( 10 \, \text{m/s} \) to \( 30 \, \text{m/s} \) in \( 5 \, \text{s} \). What is its acceleration?

Use \( a = \frac{v - v_0}{t} \). Here, \( v = 30 \, \text{m/s} \), \( v_0 = 10 \, \text{m/s} \), \( t = 5 \, \text{s} \).

Substitute: \( a = \frac{30 - 10}{5} = \frac{20}{5} = 4 \, \text{m/s}^2 \).

The acceleration is \( 4 \, \text{m/s}^2 \).

4 m/s²
6 m/s²
2 m/s²
8 m/s²
1

A charged conductor is surrounded by a thin concentric hollow conducting shell. If the shell is grounded, what happens to the charge on the inner conductor?

When the outer shell is grounded (potential \( V = 0 \)), the potential on the inner conductor adjusts due to charge redistribution. If the inner conductor has charge \( Q \), the inner surface of the shell induces \( -Q \), and since the shell's potential is zero, the outer surface of the shell acquires \( +Q \). The charge on the inner conductor remains \( Q \), as grounding the shell does not change the charge on the inner conductor but affects the potential and charge distribution on the shell.

It becomes zero
It induces an equal charge on the shell
It remains unchanged
It transfers entirely to the shell
3

In SHM, which quantity is maximized when the particle’s acceleration is at its peak?

Acceleration peaks at \( a_{\text{max}} = \omega^2 A \) when \( x = \pm A \) (extreme positions), where potential energy (\( U = \frac{1}{2} k A^2 \)) is maximum.

Kinetic energy
Velocity
Displacement
Potential energy
4

In a plane mirror, why does the image distance equal the object distance?

In a plane mirror, light reflects such that the angle of incidence equals the angle of reflection. This symmetry ensures that the perpendicular distance from the object to the mirror equals the apparent distance of the image behind it, as the image forms along the normal extended backward.

Due to light converging behind the mirror
Due to the mirror’s curvature
Due to light dispersion
Due to equal angles of incidence and reflection
4

A coil of 40 turns experiences a magnetic flux change from 0 to 0.01 Wb in 0.05 s. What is the induced emf?

\( \varepsilon = N \frac{\Delta \Phi}{\Delta t} \).

\( \Delta \Phi = 0.01 \, \text{Wb} \), \( \Delta t = 0.05 \, \text{s} \), \( N = 40 \).

\( \varepsilon = 40 \times \frac{0.01}{0.05} = 40 \times 0.2 = 8 \, \text{V} \).

8 V
10 V
12 V
14 V
1

A \( 3.5 \, \text{kg} \) mass falls from \( 7 \, \text{m} \) onto a spring (\( k = 1200 \, \text{N/m} \)). What is the maximum compression? (Take \( g = 10 \, \text{m/s}^2 \))

Potential energy \( mgh = 3.5 \times 10 \times 7 = 245 \, \text{J} \).

Spring energy \( \frac{1}{2} k x_m^2 = 245 \Rightarrow 600 x_m^2 = 245 \Rightarrow x_m = \sqrt{0.4083} \approx 0.639 \, \text{m} \).

0.6 m
0.64 m
0.7 m
0.75 m
2

The frequency \( f \) of a wave depends on velocity \( v \) and wavelength \( \lambda \) as \( f = k v^a \lambda^b \). Find \( a \) and \( b \).

\( [f] = [T^{-1}] \), \( [v] = [L T^{-1}] \), \( [\lambda] = [L] \).

\( [T^{-1}] = [L T^{-1}]^a [L]^b = [L^{a+b} T^{-a}] \).

Equate: \( a + b = 0 \), \( -a = -1 \).

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

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

A copper rod of length \( 2.0 \, \text{m} \) and cross-sectional area \( 2.5 \times 10^{-6} \, \text{m}^2 \) is subjected to a tensile force of \( 500 \, \text{N} \). If the Young's modulus of copper is \( 1.1 \times 10^{11} \, \text{N/m}^2 \), what is the strain produced?

Stress: \( \text{Stress} = \frac{F}{A} = \frac{500}{2.5 \times 10^{-6}} = 2 \times 10^8 \, \text{N/m}^2 \).

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

Strain: \( \text{Strain} = \frac{\text{Stress}}{Y} = \frac{2 \times 10^8}{1.1 \times 10^{11}} \approx 1.82 \times 10^{-3} \).

\( 1.82 \times 10^{-3} \)
\( 2 \times 10^{-3} \)
\( 1.5 \times 10^{-3} \)
\( 1 \times 10^{-3} \)
1

The mean free path of a gas molecule is \(8 \times 10^{-7} \, \text{m}\) at 1 atm. What will it be at 0.25 atm if temperature remains constant?

\(l \propto \frac{1}{n}\), \(n \propto P\). If \(P\) reduces to \(\frac{1}{4}\), \(n\) reduces to \(\frac{1}{4}\), \(l\) increases 4 times.

New \(l = 8 \times 10^{-7} \times 4 = 3.2 \times 10^{-6} \, \text{m}\).

\(4.0 \times 10^{-7} \, \text{m}\)
\(8.0 \times 10^{-7} \, \text{m}\)
\(1.6 \times 10^{-6} \, \text{m}\)
\(3.2 \times 10^{-6} \, \text{m}\)
4

A \( 6 \, \mu\text{F} \) capacitor charged to \( 150 \, \text{V} \) is connected to an uncharged \( 9 \, \mu\text{F} \) capacitor. What is the energy lost?

Initial energy: \( U_i = \frac{1}{2} \times 6 \times 10^{-6} \times (150)^2 = 0.0675 \, \text{J} \).

Charge: \( Q = 6 \times 10^{-6} \times 150 = 9 \times 10^{-4} \, \text{C} \).

Total \( C = 6 + 9 = 15 \, \mu\text{F} \), \( V = \frac{9 \times 10^{-4}}{15 \times 10^{-6}} = 60 \, \text{V} \).

Final energy: \( U_f = \frac{1}{2} \times 15 \times 10^{-6} \times (60)^2 = 0.027 \, \text{J} \).

Loss: \( U_i - U_f = 0.0675 - 0.027 = 0.0405 \, \text{J} \).

0.03 J
0.035 J
0.045 J
0.0405 J
4

What is the minimum speed to escape from \( 8 R_E \) from Earth’s center? (\( g = 9.8 \, \text{m/s}^2, R_E = 6.4 \times 10^6 \, \text{m} \))

\( v_e = \sqrt{\frac{2 g R_E^2}{8 R_E}} = \sqrt{\frac{2 \times 9.8 \times 6.4 \times 10^6}{8}} \).

\( v_e = \sqrt{1.568 \times 10^7} \approx 3.96 \times 10^3 \, \text{m/s} \approx 4.0 \, \text{km/s} \).

3.9 km/s
4.0 km/s
4.1 km/s
4.2 km/s
2

A pipe open at both ends has a length of 0.51 m and a speed of sound of 340 m/s. What is the frequency of its third harmonic?

For open pipe: \( v_n = \frac{n v}{2L} \).

Third harmonic (\( n = 3 \)): \( v_3 = \frac{3 \times 340}{2 \times 0.51} = \frac{1020}{1.02} = 1000 \, \text{Hz} \).

900 Hz
950 Hz
1000 Hz
1050 Hz
3

What is true about the angular speed in uniform circular motion if the period of revolution increases?

Angular speed is \( \omega = \frac{2\pi}{T} \), where \( T \) is the period. If the period increases, \( \omega \) decreases because they are inversely proportional; a longer period means fewer revolutions per unit time.

It increases
It remains constant
It becomes zero
It decreases
4

A solenoid has 600 turns per meter and carries a current of \( 3 \, \text{A} \). What is the magnetic field inside it? (\( \mu_0 = 4 \pi \times 10^{-7} \, \text{T m/A} \))

Magnetic field \( B = \mu_0 n I \).

\( B = 4 \pi \times 10^{-7} \times 600 \times 3 = 7.2 \pi \times 10^{-4} \approx 2.26 \times 10^{-3} \, \text{T} \).

1.13 × 10⁻³ T
2.26 × 10⁻³ T
4.52 × 10⁻³ T
3.39 × 10⁻³ T
2

Chemistry

What is the oxidation state of iron in \( \ce{K4[Fe(CN)6]} \)?

Each \( \ce{CN^-} \) is -1, 6 ligands = -6. The complex \( \ce{[Fe(CN)6]^{4-}} \) is balanced by 4 K⁺, so Fe’s oxidation state is \( x - 6 = -4 \), \( x = +2 \).

+2
+3
+4
+1
1

In the Dumas method, 0.35 g of a compound gave 67.2 mL of \( \ce{N2} \) at STP. What is the percentage of nitrogen? (Atomic mass: N = 14)

Mass of \( \ce{N2} = \frac{28 \times 67.2}{22400} = 0.084 \) g. Mass of N = 0.084 g. Percentage = \( \frac{0.084 \times 100}{0.35} = 24\% \).

23.0%
23.5%
24.5%
24.0%
3

For the reaction \(\ce{1/2N2(g) + 3/2H2(g) -> NH3(g)}\), if \(\Delta_f H^\circ\) of NH₃(g) is -46.11 kJ/mol, what is \(\Delta_r H\)?

\(\Delta_r H = [-46.11] - [0 + 0] = -46.11 kJ/mol\).

46.11 kJ/mol
-92.22 kJ/mol
-46.11 kJ/mol
0 kJ/mol
3

Which of the following statements is true about benzene?

Benzene has delocalized \( \pi \)-electrons and shows resonance, making it more stable.

It contains three localized double bonds
It undergoes addition reactions easily
It has delocalized \( \pi \)-electrons
It follows Markovnikov’s rule
3

How many pi bonds are present in the \( \ce{HNO3} \) molecule?

In \( \ce{HNO3} \), there is 1 double bond (N=O) with 1 pi bond (plus 3 sigma bonds: N-O, N-OH, O-H), totaling 1 pi bond.

2
3
0
1
4

What happens when ethane is treated with excess chlorine in sunlight?

Ethane undergoes free radical substitution, leading to the formation of hexachloroethane.

Ethyl chloride
Dichloroethane
Tetrachloroethane
Hexachloroethane
4

In the reaction \( \ce{C3H6 + 4.5O2 -> 3CO2 + 3H2O} \), how many grams of CO₂ are produced from 21 g of C₃H₆ with excess O₂? (Atomic masses: C = 12, H = 1, O = 16)

Molar mass of C₃H₆ = (3 × 12) + (6 × 1) = 42 g/mol.

Moles of C₃H₆ = 21 / 42 = 0.5 mol.

1 mol C₃H₆ 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
33 g
1

What is the mass percentage of magnesium in Mg(NO₃)₂? (Atomic masses: Mg = 24, N = 14, O = 16)

Molar mass = 24 + (2 × 14) + (6 × 16) = 24 + 28 + 96 = 148 g/mol.

Mass of Mg = 24 g.

% Mg = (24 / 148) × 100 ≈ 16.22%.

16.22%
15%
18%
20%
1

How many grams of H₂O are produced from 10 g of H₂SO₄ in the reaction \( \ce{H2SO4 + 2NaOH -> Na2SO4 + 2H2O} \)? (Atomic masses: H = 1, S = 32, O = 16)

Moles of H₂SO₄ = 10 / 98 ≈ 0.102 mol.

1 mol H₂SO₄ produces 2 mol H₂O. Moles of H₂O = 0.102 × 2 ≈ 0.204 mol.

Mass = 0.204 × 18 ≈ 3.67 g.

1.8 g
3 g
3.67 g
4.5 g
3

Which molecule has a single bond with the longest bond length?

\( \ce{I2} \) has a single bond with a length of 267 pm, longer than \( \ce{Cl2} \) (199 pm), \( \ce{F2} \) (144 pm), or \( \ce{H2} \) (74 pm) due to larger atomic size.

\( \ce{Cl2} \)
\( \ce{F2} \)
\( \ce{I2} \)
\( \ce{H2} \)
3

In the laboratory preparation of \( \ce{KMnO4} \), which oxidizing agent converts \( \ce{Mn^{2+}} \) to \( \ce{MnO4^-} \)?

\( \ce{2Mn^{2+} + 5S2O8^{2-} + 8H2O -> 2MnO4^- + 10SO4^{2-} + 16H^+} \). Peroxodisulphate (\( \ce{S2O8^{2-}} \)) is used.

\( \ce{O2} \)
\( \ce{S2O8^{2-}} \)
\( \ce{KNO3} \)
\( \ce{H2SO4} \)
2

For an ideal gas undergoing adiabatic expansion, what is the relationship between internal energy and work?

In an adiabatic process, \(q = 0\), so \(\Delta U = w\). Work done by the system decreases internal energy.

\(\Delta U = q\)
\(\Delta U = w\)
\(\Delta U = q + w\)
\(\Delta U = 0\)
2

What is the maximum oxidation state exhibited by vanadium in the 3d series?

Vanadium (V, Z = 23) exhibits oxidation states from +2 to +5, with +5 being the maximum, as seen in \( \ce{VO2^+} \).

+3
+5
+4
+6
2

Which of the following trends is observed for non-metallic character across a period?

Non-metallic character increases across a period as electronegativity rises and metallic properties diminish.

Decreases
Increases
Remains constant
First increases then decreases
2

A gaseous reaction follows \( \ce{Rate = k p_A p_B} \) with \( k = 0.04 \, \ce{atm^{-1} s^{-1}} \), \( p_A = 0.5 \, \ce{atm} \), and \( p_B = 0.2 \, \ce{atm} \). What is the rate in \( \ce{atm s^{-1}} \)?

Rate = \( k p_A p_B = 0.04 \times 0.5 \times 0.2 = 0.004 \).

0.002
0.008
0.006
0.004
4

What is the bond order of \( \ce{NO^+} \) according to molecular orbital theory?

For \( \ce{NO^+} \): 14 electrons, \( (\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\sigma 2p_z)^2 \). Bonding = 10, antibonding = 4. Bond order = \( \frac{1}{2} (10 - 4) = 3 \).

2
1.5
2.5
3
4

What is the coefficient of \( \ce{H2O} \) when the reaction \( \ce{MnO4^- + I^- -> MnO2 + I2} \) is balanced in basic medium?

Using the half-reaction method: Oxidation: \( \ce{2I^- -> I2 + 2e^-} \). Reduction: \( \ce{MnO4^- + 2H2O + 3e^- -> MnO2 + 4OH^-} \). Equalize electrons (6), combine: \( \ce{2MnO4^- + 6I^- + 4H2O -> 2MnO2 + 3I2 + 8OH^-} \). Coefficient of \( \ce{H2O} \) is 4.

2
4
6
8
2

The rate law of a reaction is \( \ce{Rate = k[A]^2[B]} \). If [A] is tripled and [B] is reduced to one-third, by what factor does the rate increase?

Initial rate = \( k[\ce{A}]^2[\ce{B}] \), new rate = \( k(3[\ce{A}])^2(\frac{1}{3}[\ce{B}]) = k \times 9[\ce{A}]^2 \times \frac{1}{3}[\ce{B}] = 3k[\ce{A}]^2[\ce{B}] \).

Factor = 3.

3
9
1
27
1

Which of the following aldehydes does not undergo the Cannizzaro reaction?

The Cannizzaro reaction occurs in aldehydes that do not contain an α-hydrogen. Acetaldehyde contains an α-hydrogen, so it does not undergo the reaction.

Formaldehyde
Benzaldehyde
Acetaldehyde
p-Nitrobenzaldehyde
3

What is the major product obtained when phenol reacts with sodium hydroxide and carbon dioxide?

The Kolbe’s reaction involves the reaction of sodium phenoxide with CO2 to form salicylic acid.

Benzoic acid
Salicylic acid
Benzophenone
Phenyl acetate
2

Which ketone is least reactive towards nucleophilic addition?

As steric hindrance increases, reactivity decreases. Benzophenone has bulky phenyl groups, making it the least reactive.

Acetone
Cyclohexanone
Benzophenone
Acetophenone
4

A solution contains 10 g of urea (\( \ce{NH2CONH2} \)) in 190 g of water. What is the molality of the solution? (Molar mass: \( \ce{NH2CONH2} = 60 \, \text{g/mol} \))

Moles of urea = \( \frac{10}{60} = 0.1667 \, \text{mol} \).

Mass of solvent in kg = \( \frac{190}{1000} = 0.19 \, \text{kg} \).

Molality = \( \frac{0.1667}{0.19} = 0.877 \, \text{mol/kg} \).

0.877 mol/kg
0.439 mol/kg
1.754 mol/kg
0.658 mol/kg
1

The rate constant of a reaction is \( 3.5 \times 10^{-5} \, \ce{s^{-1}} \) at 27°C and \( E_a = 52 \, \ce{kJ mol^{-1}} \). What is the rate constant at 37°C? (R = 8.314 J/mol·K)

\( \log \frac{k_2}{3.5 \times 10^{-5}} = \frac{52000}{2.303 \times 8.314} \left( \frac{10}{300 \times 310} \right) = 0.295 \).

\( k_2 = 3.5 \times 10^{-5} \times 10^{0.295} = 6.96 \times 10^{-5} \approx 7.0 \times 10^{-5} \).

\( 5.0 \times 10^{-5} \)
\( 8.5 \times 10^{-5} \)
\( 7.0 \times 10^{-5} \)
\( 3.5 \times 10^{-5} \)
3

Which reagent is commonly used to reduce aldehydes to primary alcohols?

Sodium borohydride (\(\ce{NaBH4}\)) is a mild reducing agent that selectively reduces aldehydes to primary alcohols.

KMnO4
NaBH4
LiAlH4
Tollens' reagent
2

In combustion analysis, 0.18 g of a compound gave 0.44 g of \( \ce{CO2} \). What is the percentage of carbon? (Atomic masses: C = 12, O = 16)

Molar mass of \( \ce{CO2} = 44 \) g/mol. Mass of C = \( \frac{12 \times 0.44}{44} = 0.12 \) g. Percentage = \( \frac{0.12 \times 100}{0.18} = 66.67\% \).

65.0%
66.0%
67.0%
66.7%
3

How many Faradays of electricity are required to deposit 0.635 g of copper from CuSO₄ solution? (Molar mass of Cu = 63.5 g/mol)

Reaction: Cu²⁺ + 2e⁻ → Cu(s), 2F deposits 63.5 g.

Moles of Cu = \( \frac{0.635}{63.5} = 0.01 \, \text{mol} \).

Faradays = \( 0.01 \times 2 = 0.02 \, \text{F} \).

0.02 F
0.01 F
0.04 F
0.03 F
1

Which of the following elements is a chalcogen?

Selenium (Se) belongs to Group 16 (chalcogens), known for forming compounds like \(H_2Se\).

Cl
Br
Se
As
3

Which of the following compounds does not form a salt with \( \ce{HCl} \)?

Amides like \( \ce{CH3CONH2} \) are neutral and do not form salts with \( \ce{HCl} \), unlike amines which are basic and protonate to form ammonium salts.

\( \ce{CH3NH2} \)
\( \ce{(CH3)2NH} \)
\( \ce{CH3CONH2} \)
\( \ce{C6H5NH2} \)
3

For \( \ce{H2(g) + I2(g) <=> 2HI(g)} \), increasing volume will:

\( \Delta n = 2 - (1 + 1) = 0 \). Changing volume (pressure) has no effect on equilibrium position.

Shift to products
Shift to reactants
No effect
Increase \( K_c \)
3

In the Dumas method, 0.5 g of a compound gave 134.4 mL of \( \ce{N2} \) at STP. What is the percentage of nitrogen? (Atomic mass: N = 14)

Mass of \( \ce{N2} = \frac{28 \times 134.4}{22400} = 0.168 \) g. Mass of N = 0.168 g. Percentage = \( \frac{0.168 \times 100}{0.5} = 33.6\% \).

32.0%
33.0%
34.0%
33.6%
4

The \( K_p \) for \( \ce{CS2(g) + 4H2(g) <=> CH4(g) + 2H2S(g)} \) is 0.25 at 900 K. What is \( K_c \) if \( R = 0.0821 \, \text{L·atm·mol}^{-1}\text{·K}^{-1} \)?

\( \Delta n = (1 + 2) - (1 + 4) = -2 \), \( K_p = K_c (RT)^{\Delta n} \).

\( RT = 0.0821 \times 900 = 73.89 \), \( (RT)^{-2} = (73.89)^{-2} \approx 1.83 \times 10^{-4} \).

\( 0.25 = K_c \cdot 1.83 \times 10^{-4} \), \( K_c \approx 1365 \).

0.25
1370
\( 5.5 \times 10^{-5} \)
73.89
1

A solution of two volatile liquids A and B has a total vapor pressure of 320 mm Hg. If the vapor pressure of pure A is 400 mm Hg and that of pure B is 200 mm Hg, what is the mole fraction of B in the solution?

Using Raoult's law: \( p_{\text{total}} = x_A p_A^0 + x_B p_B^0 \), where \( x_A + x_B = 1 \).

\( 320 = (1 - x_B) \cdot 400 + x_B \cdot 200 \).

\( 320 = 400 - 400 x_B + 200 x_B \).

\( 320 = 400 - 200 x_B \), \( 200 x_B = 80 \), \( x_B = 0.4 \).

0.6
0.4
0.8
0.2
2

Which subshell has the lowest energy for \(n = 4\) in a multi-electron atom?

In multi-electron atoms, energy increases with \(l\) for a given \(n\). For \(n = 4\), \(4s (l = 0)\) has the lowest energy, followed by \(4p, 4d, 4f\).

\(4p\)
\(4d\)
\(4f\)
\(4s\)
4

What is the electrolyte used in a hydrogen-oxygen fuel cell as described in the Apollo space program?

The electrolyte is a concentrated aqueous sodium hydroxide solution.

Sulfuric acid
Potassium chloride
Hydrochloric acid
Sodium hydroxide
4

For \( \ce{2H2O(g) <=> 2H2(g) + O2(g)} \), decreasing volume will:

\( \Delta n = (2 + 1) - 2 = 1 \). Decreasing volume (increasing pressure) shifts to reactants (fewer moles).

Shift to products
Shift to reactants
No effect
Increase \( K_p \)
2

How many geometrical isomers are possible for \( \ce{[Co(NH3)3Cl3]} \)?

For an octahedral complex of type \( \ce{[Ma3b3]} \), two geometrical isomers are possible: facial (fac), where three identical ligands occupy one face, and meridional (mer), where they lie in a plane.

3
1
2
4
3

The hormone adrenaline is secreted by:

Adrenaline (epinephrine), an amino acid-derived hormone, is secreted by the adrenal medulla to prepare the body for fight-or-flight responses.

Pancreas
Thyroid
Pituitary
Adrenal medulla
4

Which of the following is a major environmental concern associated with Freons?

Freons are responsible for the depletion of the ozone layer.

Global warming
Acid rain
Ozone layer depletion
Water pollution
3

For a reaction with \(\Delta H = -50 kJ/mol\) and \(\Delta S = 0.25 kJ/K·mol\), at what temperature is \(\Delta G = 0\)?

At equilibrium, \(\Delta G = 0\), so \(\Delta H - T\Delta S = 0\). \(T = \Delta H / \Delta S = -50 / 0.25 = 200 K\).

100 K
150 K
250 K
200 K
4

The number of unpaired electrons in \( \ce{Mn^{2+}} \) (Z = 25) is:

Mn: \( 3d^5 4s^2 \). \( \ce{Mn^{2+}} \): \( 3d^5 \). All 5 electrons are unpaired in the 3d orbitals, per Hund’s rule.

3
4
5
2
3

Which element has the configuration \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6\)?

Total electrons = \(2 + 2 + 6 + 2 + 6 + 10 + 2 + 6 = 36\), corresponding to krypton (Z = 36).

Argon
Calcium
Krypton
Zinc
3

Which of the following halides is least reactive toward the \( S_N2 \) mechanism?

Tertiary halides react the slowest in \( S_N2 \) reactions due to steric hindrance.

\( \ce{CH3Cl} \)
\( \ce{CH3CH2Br} \)
\( \ce{(CH3)3CCl} \)
\( \ce{CH3CH2CH2I} \)
3

Which reagent is used to reduce \( \ce{CH3CH2CN} \) to \( \ce{CH3CH2CH2NH2} \)?

Propanenitrile (\( \ce{CH3CH2CN} \)) is reduced to propan-1-amine (\( \ce{CH3CH2CH2NH2} \)) using \( \ce{H2}/Ni \), a common method for nitrile reduction.

\( \ce{NaBH4} \)
\( \ce{Br2}/NaOH \)
\( \ce{H2}/Ni \)
\( \ce{HCl} \)
3

Which reaction is used to convert phenol to salicylic acid?

Kolbe’s reaction involves the reaction of phenoxide ion with carbon dioxide to form salicylic acid.

Reimer-Tiemann reaction
Kolbe's reaction
Williamson synthesis
Cumene process
2

How many geometrical isomers are possible for \( \ce{[Pt(NH3)(Br)(Cl)(py)]} \)?

For a square planar \( \ce{[Ma b c d]} \) complex, 3 geometrical isomers are possible by varying the relative positions of the four different ligands.

2
3
4
1
2

Botany

Which of the following is an example of multiple allelism?

Human skin color
ABO blood group system
Sickle-cell anemia
Color blindness
2

The ABO blood group system exhibits multiple allelism, involving three alleles (IA, IB, and i).

Which of the following statements about DNA replication is correct?

Replication occurs in the 3' to 5' direction.
Both strands of DNA are synthesized continuously.
Okazaki fragments are synthesized on the leading strand.
Replication is semi-conservative.
4

DNA replication is **semi-conservative**, meaning each new DNA molecule consists of one parental and one newly synthesized strand.

Zygomorphic flowers are characterized by:

Radial symmetry
Bilateral symmetry
Absence of nectar guides
Lack of specialized pollinators
2

Zygomorphic flowers exhibit bilateral symmetry and often possess specialized structures to attract specific pollinators.

Which of the following statements about lateral roots is correct?

Lateral roots originate from the epidermis.
Lateral roots originate from the pericycle.
Lateral roots originate from the pith.
Lateral roots originate from the phloem.
2

Lateral roots arise from the pericycle, making them endogenous in origin.

Which scientist discovered the Golgi apparatus?

Robert Brown
Camillo Golgi
Anton Von Leeuwenhoek
Matthias Schleiden
2

Camillo Golgi discovered the Golgi apparatus in 1898, which is involved in the modification, packaging, and transport of cellular materials.

Which bioactive molecule is produced by Monascus purpureus?

Penicillin
Statins
Streptokinase
Cyclosporin A
2

Statins, produced by Monascus purpureus, are used to lower cholesterol levels in humans.

Which of the following is a correct statement about ecosystem services?

Ecosystem services include water purification and nutrient cycling.
Ecosystem services only benefit forest-dwelling species.
Ecosystem services are not important for human life.
Ecosystem services are unrelated to biodiversity.
1

Ecosystem services such as water purification, nutrient cycling, and climate regulation are crucial for both ecosystems and human survival.

Which of the following is an example of a secondary consumer in an aquatic food chain?

Phytoplankton
Zooplankton
Small fish
Shark
3

Small fish are secondary consumers in an aquatic food chain as they feed on zooplankton, which are primary consumers.

Which international organization maintains the Red List of threatened species?

UNESCO
IUCN
WWF
CITES
2

The International Union for Conservation of Nature (IUCN) maintains the Red List of threatened species.

Which structure in dicot roots stores food?

Epidermis
Cortex
Pericycle
Xylem
2

The cortex of dicot roots consists of parenchymatous cells that store food and nutrients.

Which of the following statements about molecular taxonomy is correct?

It classifies organisms based on genetic and molecular similarities.
It only uses physical traits for classification.
It does not help in evolutionary studies.
It is not useful in modern taxonomy.
1

Molecular taxonomy uses genetic and molecular data to classify organisms and study evolutionary relationships.

Which of the following statements about nutrient transport within the ovule is correct?

The chalaza is the region in the ovule that facilitates nutrient transfer from the placenta to the developing ovule.
Nutrient transport in the ovule occurs solely through the funiculus.
Nutrient transport is not necessary for ovule development.
The integuments are responsible for nutrient transport to the embryo.
1

The chalaza is the key region of the ovule where nutrient transfer occurs from the placenta, ensuring the developing ovule is supplied with essential nutrients.

What is the function of NADH and FADH₂ in cellular respiration?

Directly produce ATP
Act as final electron acceptors
Donate electrons to the Electron Transport Chain
Break down glucose in glycolysis
3

NADH and FADH₂ donate electrons to the Electron Transport Chain, leading to ATP production through oxidative phosphorylation.

Which sequence marks the end of transcription in prokaryotes?

Start codon
TATA box
Terminator sequence
Shine-Dalgarno sequence
3

The terminator sequence signals the end of transcription in prokaryotes.

Which ecosystem service is NOT directly provided by biodiversity?

Pollination
Oxygen production
Climate regulation
Fossil fuel formation
4

Fossil fuel formation occurs over millions of years and is not directly provided by biodiversity, unlike pollination, oxygen production, and climate regulation.

Select the correct statement about plant hormones:

Cytokinins inhibit cell division.
Abscisic acid promotes seed dormancy.
Gibberellins suppress bolting in rosette plants.
Ethylene delays fruit ripening.
2

Abscisic acid induces seed dormancy, helping seeds survive unfavorable conditions. Cytokinins promote, not inhibit, cell division, and ethylene promotes, not delays, fruit ripening.

Which of the following correctly describes polygenic inheritance?

One gene controls multiple traits.
Multiple genes influence a single trait.
A single gene determines a single phenotype.
Traits are inherited only from one parent.
2

Polygenic inheritance occurs when multiple genes contribute to a single phenotype, such as human height.

Which of the following is a product of the Calvin cycle?

NADPH
Oxygen
G3P (Glyceraldehyde-3-phosphate)
Water
3

The Calvin cycle produces G3P, which is later used to form glucose and other carbohydrates.

Which of the following genetic disorders follows a Y-linked inheritance pattern?

Color blindness
Hemophilia
Hypertrichosis (hairy ears)
Sickle-cell anemia
3

Hypertrichosis (hairy ears) follows a Y-linked inheritance pattern, as the gene is located on the Y chromosome and is only passed from father to son.

Which of the following describes a perianth?

The outermost whorl of the flower
A fusion of calyx and corolla
The male reproductive part
The female reproductive part
2

In some flowers like lily, the calyx and corolla are not distinct and are collectively called the perianth.

What is the primary genetic cause of hemophilia?

Trisomy of chromosome 21
A mutation in the X chromosome
Deletion of chromosome 5
A mutation in the Y chromosome
2

Hemophilia is a sex-linked recessive disorder caused by a mutation in the X chromosome.

Which part of a dicot seed is responsible for food storage?

Endosperm
Cotyledons
Plumule
Radicle
2

In dicot seeds like gram and pea, the cotyledons store food and provide nourishment to the embryo.

Which component of the human genome consists of the highest percentage?

Protein-coding genes
Repetitive sequences
Regulatory elements
Non-coding RNAs
2

Repetitive sequences make up a large portion of the human genome, while protein-coding genes constitute less than 2%.

Which type of aestivation is characterized by one petal overlapping the other in one particular direction?

Valvate
Twisted
Imbricate
Vexillary
2

Twisted aestivation, as seen in china rose, occurs when one petal overlaps the next one in a specific direction.

Which cellular structure is responsible for packaging and sorting proteins before they are transported to their destinations?

Lysosome
Golgi apparatus
Endoplasmic reticulum
Ribosome
2

The Golgi apparatus modifies, sorts, and packages proteins received from the endoplasmic reticulum for secretion or delivery to other organelles.

Which factor is most likely to regulate a population size in a density-dependent manner?

Hurricane
Disease
Earthquake
Volcanic eruption
2

Density-dependent factors, such as disease, increase in effect as population density rises.

Which biome has the highest annual net primary productivity?

Tundra
Deserts
Tropical rainforests
Grasslands
3

Tropical rainforests have the highest net primary productivity due to high temperatures, rainfall, and solar radiation.

Which of the following is incorrect about RNA?

RNA is usually single-stranded.
RNA contains uracil instead of thymine.
RNA has deoxyribose sugar.
mRNA carries genetic information from DNA to the ribosome.
3

RNA contains **ribose sugar, not deoxyribose**.

Which of the following statements about the Z-scheme of electron transport is correct?

It describes the movement of electrons from Photosystem I to Photosystem II.
It does not involve ATP synthesis.
It explains the unidirectional flow of electrons in non-cyclic photophosphorylation.
It does not involve the splitting of water.
3

The Z-scheme illustrates the electron flow from water to NADP+ in non-cyclic photophosphorylation.

Which of the following statements about the cell wall is correct?

The cell wall is found in animal cells.
The cell wall is primarily composed of cellulose in plant cells.
The cell wall produces ATP.
The cell wall is composed of phospholipids.
2

The cell wall in plant cells is primarily made of cellulose, providing structure and protection.

Which of the following modifications occurs at the 5' end of eukaryotic mRNA?

Polyadenylation
Splicing
Capping
Methylation of cytosine
3

In eukaryotes, a 5' cap (methyl guanosine triphosphate) is added to mRNA to enhance stability and translation efficiency.

Which of the following molecules is the first stable compound formed in the Krebs cycle?

Succinic acid
Fumaric acid
Citric acid
Malic acid
3

Citric acid is the first stable compound formed when Acetyl-CoA combines with oxaloacetic acid in the Krebs cycle.

Which type of cell division produces new cells in the root apical meristem?

Meiosis
Mitosis
Binary fission
Budding
2

Mitosis occurs in the root apical meristem, producing genetically identical daughter cells for growth.

Which term describes the arrangement of floral parts in a flower bud?

Placentation
Aestivation
Phyllotaxy
Venation
2

Aestivation refers to the mode of arrangement of sepals or petals in a floral bud, which can be valvate, twisted, imbricate, or vexillary.

Which of the following is incorrect about crossing over in meiosis?

Crossing over occurs during pachytene of prophase I
It involves exchange of genetic material between homologous chromosomes
Crossing over leads to genetic recombination
Crossing over occurs during metaphase II
4

Crossing over occurs during pachytene of prophase I, not in metaphase II.

Which of the following statements about cyclic photophosphorylation is correct?

It involves both Photosystem I and II.
It produces both ATP and NADPH.
Electrons return to Photosystem I after energy transfer.
Oxygen is released during this process.
3

In cyclic photophosphorylation, electrons cycle back to Photosystem I, producing ATP but no NADPH or oxygen.

Which of the following is true about the S phase of interphase?

DNA replication occurs, doubling the chromosome number
The cell grows and prepares for mitosis
The cell performs metabolic activities
The nuclear envelope reforms
1

During the S phase, DNA is replicated, doubling the chromosome content of the cell but not the chromosome number.

Which of the following statements about meiosis I and meiosis II is incorrect?

Meiosis I reduces the chromosome number by half
Meiosis II resembles mitosis
DNA replication occurs before both meiosis I and II
Meiosis results in four haploid cells
3

DNA replication occurs only before meiosis I, not between meiosis I and II.

Which of the following explains why fungi are classified separately from plants?

Fungi lack a cell wall
Fungi are heterotrophic
Fungi reproduce only sexually
Fungi do not have membrane-bound organelles
2

Fungi are heterotrophic, obtaining nutrients through absorption, whereas plants are autotrophic.

Which type of population growth is represented by an S-shaped curve?

Exponential growth
Logistic growth
Arithmetic growth
Unrestricted growth
2

Logistic growth is represented by an S-shaped curve, where population growth slows as it nears carrying capacity.

Which type of reproduction in algae involves the release of biflagellate zoospores?

Vegetative reproduction
Asexual reproduction
Isogamous reproduction
Oogamous reproduction
2

In algae, asexual reproduction occurs by biflagellate, motile zoospores, which germinate to form new plants.

Which genetic condition is caused by the deletion of a portion of chromosome 5?

Down’s syndrome
Klinefelter’s syndrome
Cri-du-chat syndrome
Turner’s syndrome
3

Cri-du-chat syndrome is caused by a deletion in the short arm of chromosome 5, leading to developmental abnormalities.

What is the mode of nutrition in Kingdom Animalia?

Autotrophic
Holozoic
Saprophytic
Parasitic
2

Kingdom Animalia members exhibit holozoic nutrition, which involves ingestion and internal digestion.

Which type of mutation does NOT alter the amino acid sequence of a protein?

Silent mutation
Missense mutation
Nonsense mutation
Frameshift mutation
1

A silent mutation changes a nucleotide sequence but does not alter the amino acid sequence due to redundancy in the genetic code.

What is the function of stipules in some dicot leaves?

They help in leaf attachment
They protect the leaf bud
They store food
They conduct water
2

Stipules are small leaf-like structures at the base of petioles in some dicots that protect the young leaf buds.

Zoology

Which hormone in frogs is responsible for regulating calcium metabolism?

Thyroxine
Adrenaline
Parathyroid hormone
Insulin
3

The parathyroid hormone regulates calcium metabolism and maintains calcium levels in frogs.

Which muscle type is under voluntary control?

Cardiac muscle
Smooth muscle
Skeletal muscle
Visceral muscle
3

Skeletal muscles are under voluntary control and are responsible for body movements.

Which of the following statements about Southern blotting is correct?

Southern blotting is used to detect specific DNA sequences.
Southern blotting is used to amplify DNA sequences.
Southern blotting does not require gel electrophoresis.
Southern blotting is used to study protein expression.
1

Southern blotting is a technique used to detect specific DNA sequences in a sample.

Which biomolecule serves as the primary energy source in most organisms?

Lipids
Proteins
Carbohydrates
Nucleic acids
3

Carbohydrates serve as the primary energy source for most organisms, providing immediate energy through glucose metabolism.

Which of the following disorders is characterized by an abnormally high number of white blood cells?

Leukemia
Hemophilia
Thrombocytopenia
Erythrocytosis
1

Leukemia is a cancer of white blood cells, leading to their excessive production.

Which of the following statements about natural killer (NK) cells is correct?

NK cells are a type of B-lymphocyte.
NK cells destroy virus-infected and cancerous cells.
NK cells produce antibodies.
NK cells only function in the adaptive immune response.
2

Natural killer (NK) cells are a part of the innate immune system and destroy virus-infected and cancerous cells.

Which of the following statements about nucleotides is incorrect?

Nucleotides contain a phosphate group.
Adenosine triphosphate (ATP) is a nucleotide.
Nucleotides do not contain any sugar molecules.
DNA nucleotides contain nitrogenous bases.
3

Nucleotides contain a pentose sugar, a nitrogenous base, and a phosphate group.

Which of the following is incorrect about RNA interference (RNAi)?

RNAi silences specific gene expression.
RNAi uses double-stranded RNA molecules.
RNAi enhances gene expression in all cases.
RNAi is used in developing pest-resistant crops.
3

RNA interference (RNAi) is used to silence specific gene expression, not enhance it.

Which of the following groups of animals is exclusively marine?

Echinodermata
Annelida
Arthropoda
Platyhelminthes
1

All echinoderms, such as starfish and sea urchins, are exclusively marine animals.

Which of the following bones is the longest in the human body?

Humerus
Tibia
Femur
Fibula
3

The femur (thigh bone) is the longest and strongest bone in the human body.

Which step in recombinant DNA technology involves making multiple copies of a gene?

Isolation of DNA
Insertion of DNA into a vector
Gene amplification using PCR
Selection of recombinant cells
3

Polymerase Chain Reaction (PCR) is used to amplify specific DNA sequences, producing multiple copies of a gene.

During spermatogenesis, which meiotic division results in the formation of spermatids?

Meiosis I
Meiosis II
Mitosis
Spermiogenesis
2

Meiosis II divides secondary spermatocytes into spermatids, which then undergo spermiogenesis to form mature spermatozoa.

Which bone forms the upper arm?

Radius
Ulna
Humerus
Scapula
3

The humerus is the long bone of the upper arm that connects the shoulder to the forearm.

Which method is used to introduce foreign DNA into bacterial cells?

Southern blotting
Microinjection
Heat shock transformation
Gel electrophoresis
3

Heat shock transformation increases bacterial membrane permeability, allowing DNA uptake.

Which condition in males is characterized by decreased sperm motility, leading to reduced fertility?

Oligospermia
Azoospermia
Asthenospermia
Teratospermia
3

Asthenospermia is characterized by reduced sperm motility, which can impair the ability of sperm to reach and fertilize the oocyte.

Which of the following is incorrect about plasmids in genetic engineering?

Plasmids are circular DNA molecules.
Plasmids replicate independently in host cells.
Plasmids are used as vectors to transfer genes.
Plasmids encode ribosomal RNA in humans.
4

Plasmids do not encode ribosomal RNA in humans; they are used as vectors in genetic engineering.

Which hominid species lived in East African grasslands and used stone tools about 2 million years ago?

Homo sapiens
Homo erectus
Australopithecus
Neanderthal Man
3

Australopithecus lived in East African grasslands about 2 million years ago and used primitive stone tools.

Which method allows the identification of mutated genes using radioactive probes?

ELISA
Southern blotting
PCR
Autoradiography
4

Autoradiography detects mutated genes by using radioactive probes that hybridize with complementary DNA.

Which of the following statements about proteins is incorrect?

Proteins are made of amino acids linked by peptide bonds.
Proteins can act as enzymes, structural components, and hormones.
Proteins store genetic information.
The structure of a protein determines its function.
3

Proteins do not store genetic information; that role belongs to nucleic acids.

Which of the following cells are involved in the production of antibodies?

T-cytotoxic cells
Macrophages
Plasma cells
Basophils
3

Plasma cells, derived from B-lymphocytes, are responsible for producing antibodies.

Which part of the plant is commonly used for producing virus-free plants through tissue culture?

Leaves
Meristem
Roots
Stems
2

Meristem tissues are used in tissue culture to produce virus-free plants as they are usually not infected by viruses.

Which immune component is responsible for transplant rejection?

B-lymphocytes
T-lymphocytes
Macrophages
Neutrophils
2

T-lymphocytes play a key role in transplant rejection by recognizing foreign tissues as non-self and attacking them.

Which of the following is an incorrect statement about Osteichthyes?

They have a bony endoskeleton
Their heart is three-chambered
They possess an operculum over the gills
They use a swim bladder for buoyancy
2

Osteichthyes (bony fishes) have a two-chambered heart, not a three-chambered one.

Which structure in the respiratory system plays a role in humidifying inhaled air?

Alveoli
Trachea
Nasal chamber
Larynx
3

The nasal chamber humidifies, filters, and warms inhaled air before it reaches the lungs.

Which government initiative in India focuses on promoting maternal and infant health?

Mid-Day Meal Scheme
Janani Suraksha Yojana
Pradhan Mantri Awas Yojana
Swachh Bharat Abhiyan
2

Janani Suraksha Yojana is a government scheme aimed at reducing maternal and neonatal mortality by promoting institutional deliveries.

Which of the following is a correct statement regarding aldosterone?

Aldosterone regulates blood sodium and potassium levels.
Aldosterone is secreted by the adrenal medulla.
Aldosterone decreases sodium reabsorption in the kidneys.
Aldosterone is secreted in response to low blood glucose levels.
1

Aldosterone, secreted by the adrenal cortex, regulates sodium and potassium balance by increasing sodium reabsorption and potassium excretion in the kidneys.

Which part of the frog’s excretory system temporarily stores urine?

Kidney
Ureter
Urinary bladder
Cloaca
3

The urinary bladder stores urine temporarily before it is excreted through the cloaca.

Which type of neuron is responsible for connecting sensory and motor neurons?

Afferent neurons
Efferent neurons
Interneurons
Sensory neurons
3

Interneurons act as connectors between sensory and motor neurons, processing and transmitting signals within the CNS.

Which of the following is correct about the circulatory system?

The human circulatory system is an open circulatory system.
Veins always carry oxygenated blood.
The systemic circulation carries oxygenated blood to body tissues.
Pulmonary veins carry deoxygenated blood.
3

**Systemic circulation** distributes oxygenated blood from the **left ventricle** to body tissues and returns deoxygenated blood to the right atrium.

Which structure is an example of an analogous organ?

Forelimbs of mammals
Thorns of Bougainvillea and tendrils of Cucurbita
Wings of butterfly and bird
Flippers of whales and dolphins
3

Wings of butterfly and bird are analogous structures, performing similar functions but having different evolutionary origins.

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

GMOs are created using recombinant DNA technology.
GMOs can be used to produce pharmaceuticals.
GMOs have no applications in medicine.
GMOs can be used in agriculture to improve crop yield.
3

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

Which of the following is correct about the role of aldosterone in kidney function?

Aldosterone decreases sodium reabsorption.
Aldosterone promotes the excretion of sodium ions.
Aldosterone increases sodium reabsorption and potassium excretion.
Aldosterone is secreted by the pituitary gland.
3

Aldosterone increases sodium reabsorption in the kidney while promoting potassium excretion.

Which of the following statements about amino acids is correct?

Amino acids are linked by phosphodiester bonds.
Amino acids contain an amino group and a carboxyl group.
Amino acids are the building blocks of nucleic acids.
Amino acids do not contain nitrogen.
2

Amino acids contain an amino (-NH₂) group and a carboxyl (-COOH) group and are linked by peptide bonds, not phosphodiester bonds.

Which of the following statements about renal circulation is correct?

Blood enters the glomerulus through the efferent arteriole.
The renal vein carries deoxygenated but filtered blood from the kidney.
The afferent arteriole carries blood away from the nephron.
Glomerular filtration occurs in the collecting duct.
2

The renal vein carries deoxygenated but filtered blood away from the kidney.

Which of the following best describes saltatory conduction in myelinated neurons?

Impulse travels continuously along the axon
Impulse jumps between nodes of Ranvier
Impulse conduction is slower than unmyelinated neurons
Impulse transmission occurs in both directions
2

Saltatory conduction occurs when nerve impulses jump between nodes of Ranvier, increasing conduction speed.

Which of the following statements about malaria is incorrect?

Malaria is caused by Plasmodium species.
Malaria is transmitted by Anopheles mosquitoes.
Malaria can be prevented by eliminating mosquito breeding sites.
Malaria is a bacterial infection.
4

Malaria is caused by Plasmodium, a protozoan, and not by bacteria.

Which of the following characteristics is incorrect regarding amphibians?

They have a dual mode of life, living in water and on land
They possess a three-chambered heart
They lay amniotic eggs
They respire through lungs, skin, and gills at different stages
3

Amphibians lay non-amniotic eggs, usually in water, unlike reptiles, birds, and mammals, which lay amniotic eggs.

Which of the following is incorrect?

Industrial melanism is an example of natural selection.
Gene flow reduces genetic differences between populations.
Lamarck’s theory is based on the survival of the fittest.
Mutation introduces new genetic variation.
3

Lamarck’s theory proposed the inheritance of acquired traits, not the survival of the fittest, which is Darwin’s concept.

Which hormone regulates calcium levels by inhibiting bone resorption?

Parathyroid Hormone (PTH)
Calcitonin
Thyroxine
Aldosterone
2

Calcitonin, secreted by the thyroid gland, lowers blood calcium levels by inhibiting bone resorption.

Which of the following features is incorrect regarding echinoderms?

They have an endoskeleton made of calcareous ossicles
They have a closed circulatory system
They show radial symmetry in adults
They use a water vascular system for locomotion
2

Echinoderms do not have a closed circulatory system; they rely on their water vascular system for circulation.

Which factor does not influence the affinity of hemoglobin for oxygen?

Partial pressure of oxygen
pH level of the blood
Temperature
Nitrogen concentration
4

Nitrogen does not influence hemoglobin’s affinity for oxygen, unlike pO₂, pH, and temperature.

Which of the following statements regarding assisted reproductive technology (ART) is incorrect?

IVF involves fertilization outside the female body.
ICSI is useful when male partners have a low sperm count.
GIFT transfers embryos directly into the uterus.
ZIFT transfers zygotes into the fallopian tube.
3

GIFT (Gamete Intra-Fallopian Transfer) involves transferring gametes into the fallopian tube, not embryos into the uterus.

Which technique involves the direct extraction of oocytes for fertilization outside the body?

Intrauterine insemination (IUI)
Gamete intrafallopian transfer (GIFT)
Oocyte retrieval for in vitro fertilization (IVF)
Zygote intrafallopian transfer (ZIFT)
3

Oocyte retrieval is the process of extracting eggs directly from the ovaries for IVF procedures.

Which of the following is incorrect?

Mutation introduces genetic variation.
Hardy-Weinberg equilibrium is maintained without evolutionary forces.
Paleontology studies genetic sequences of organisms.
Industrial melanism is an example of natural selection.
3

Paleontology studies fossils and evolutionary history, not genetic sequences.

Which of the following conditions is characterized by the presence of endometrial tissue outside the uterine cavity?

Adenomyosis
Endometriosis
Polycystic Ovarian Syndrome (PCOS)
Uterine fibroids
2

Endometriosis is the condition in which endometrial tissue is found outside the uterus, often causing pelvic pain and infertility.

Performance Summary

Subject Correct
Answers		 Incorrect
Answers		 Attempted Skipped Accuracy
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