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NEET NEET Questions — Free MCQ Practice

NEET 2025

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A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:

A. zero at all places B. constant between the plates and zero outside the plates C. non-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates D. zero between the plates and non-zero outside

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Explanation

The displacement current produces a magnetic field that is non-zero everywhere and is maximum on the cylindrical surface joining the plate edges (at $r = R$).

NEET 2025

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An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then—

A. reflected light is completely polarized and the angle of reflection is close to $60^\circ$ B. reflected light is partially polarized and the angle of reflection is close to $30^\circ$ C. both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to $60^\circ$ and $30^\circ$, respectively D. transmitted light is completely polarized with angle of refraction close to $30^\circ$

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Explanation

$\tan\theta_B = 1.73 = \sqrt3\Rightarrow\theta_B = 60^\circ$. At Brewster's angle the reflected light is completely (plane) polarized and the angle of reflection equals $\theta_B = 60^\circ$.

NEET 2025

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Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is $q$ and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (radii of A and B are negligible compared to the distance of separation so that for calculating force between them they can be considered as point charges) is best given as:

A. $\dfrac{3F}{5}$ B. $\dfrac{2F}{3}$ C. $\dfrac{F}{2}$ D. $\dfrac{3F}{8}$

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Explanation

After touching A: $q_A = q/2$. Touching B (now $q/2 + q = 3q/2$ shared): $q_B = 3q/4$. New $F\propto\left(\tfrac{q}{2}\right)\left(\tfrac{3q}{4}\right) = \tfrac{3}{8}q^2$, i.e. $\dfrac{3F}{8}$.

NEET 2025

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A container has two chambers of volumes $V_1 = 2$ litres and $V_2 = 3$ litres separated by a partition made of a thermal insulator. The chambers contain $n_1 = 5$ and $n_2 = 4$ moles of ideal gas at pressures $p_1 = 1$ atm and $p_2 = 2$ atm, respectively. When the partition is removed, the mixture attains an equilibrium pressure of:

A. 1.3 atm B. 1.6 atm C. 1.4 atm D. 1.8 atm

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Explanation

Internal energy conserved $\Rightarrow P_f = \dfrac{p_1V_1 + p_2V_2}{V_1+V_2} = \dfrac{1(2)+2(3)}{5} = \dfrac{8}{5} = 1.6$ atm.

NEET 2025

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A particle of mass $m$ is moving around the origin with a constant force $F$ pulling it towards the origin. If Bohr model is used to describe its motion, the radius $r$ of the $n^{th}$ orbit and the particle's speed $v$ in the orbit depend on $n$ as:

A. $r\propto n^{1/3};\ v\propto n^{1/3}$ B. $r\propto n^{1/3};\ v\propto n^{2/3}$ C. $r\propto n^{2/3};\ v\propto n^{1/3}$ D. $r\propto n^{4/3};\ v\propto n^{-1/3}$

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Explanation

$F = \dfrac{mv^2}{r}$ (constant) and $mvr = \dfrac{nh}{2\pi}$. Eliminating: $v^3\propto n\Rightarrow v\propto n^{1/3}$ and $r\propto \dfrac{n}{v}\propto n^{2/3}$.

NEET 2025

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The radius of Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 Earth days. Then which of the following is the length of 1 year on Mercury?

A. 88 earth days B. 225 earth days C. 172 earth days D. 124 earth days

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Explanation

Kepler: $T\propto r^{3/2}$. $T_{Mer} = 687\times\left(\tfrac14\right)^{3/2} = \dfrac{687}{8} \approx 86 \approx 88$ days.

NEET 2025

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A body weighs 48 N on the surface of the earth. The gravitational force experienced by the body due to the earth at a height equal to one-third the radius of the earth from its surface is:

A. 16 N B. 27 N C. 32 N D. 36 N

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Explanation

$W' = W\left(\dfrac{R}{R+R/3}\right)^2 = 48\left(\dfrac{3}{4}\right)^2 = 48\times\dfrac{9}{16} = 27$ N.

NEET 2025

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A wire of resistance R is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is:

A. $\dfrac{R}{64}$ B. $\dfrac{R}{32}$ C. $\dfrac{R}{16}$ D. $\dfrac{R}{8}$

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Explanation

Each piece $= R/8$. Four in parallel $= \dfrac{R/8}{4} = \dfrac{R}{32}$. Two such sets in series $= \dfrac{R}{32}+\dfrac{R}{32} = \dfrac{R}{16}$.

NEET 2025

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De-Broglie wavelength of an electron orbiting in the $n = 2$ state of hydrogen atom is close to (Given Bohr radius $= 0.052$ nm):

A. 0.067 nm B. 0.67 nm C. 1.67 nm D. 2.67 nm

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Explanation

$r_2 = n^2a_0 = 4(0.052) = 0.208$ nm. $2\pi r = n\lambda\Rightarrow\lambda = \dfrac{2\pi r_2}{2} = \pi(0.208) \approx 0.67$ nm.

NEET 2025

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An electric dipole with dipole moment $5\times10^{-6}$ Cm is aligned with the direction of a uniform electric field of magnitude $4\times10^5$ N/C. The dipole is then rotated through an angle of $60^\circ$ with respect to the electric field. The change in the potential energy of the dipole is:

A. 0.8 J B. 1.0 J C. 1.2 J D. 1.5 J

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Explanation

$\Delta U = pE(1-\cos60^\circ) = (5\times10^{-6})(4\times10^5)(1-0.5) = 2\times0.5 = 1.0$ J.

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