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Physics MCQs for NEET — Practice Questions with Answers

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NEET 2024
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Match List I with List II.

List I (Spectral Lines of Hydrogen for transitions from) List II (Wavelengths (nm))
A. $n_2 = 3$ to $n_1 = 2$ I. 410.2
B. $n_2 = 4$ to $n_1 = 2$ II. 434.1
C. $n_2 = 5$ to $n_1 = 2$ III. 656.3
D. $n_2 = 6$ to $n_1 = 2$ IV. 486.1

Choose the correct answer from the options given below:

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Explanation

Balmer series: $3\to 2$: $H_\alpha = 656.3$ nm; $4\to 2$: $486.1$ nm; $5\to 2$: $434.1$ nm; $6\to 2$: $410.2$ nm.

NEET 2024
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Match List-I with List-II.

List-I (Material) List-II (Susceptibility ($\chi$))
A. Diamagnetic I. $\chi = 0$
B. Ferromagnetic II. $0 > \chi \geq -1$
C. Paramagnetic III. $\chi \gg 1$
D. Non-magnetic IV. $0 < \chi < \varepsilon$ (a small positive number)

Choose the correct answer from the options given below:

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Explanation

Diamagnetic: $\chi$ slightly negative; Ferromagnetic: $\chi \gg 1$; Paramagnetic: small positive; Non-magnetic: $\chi = 0$.

NEET 2024
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In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is $9.8 \times 10^{-6}\ \text{kg m}^2$. If the magnitude of magnetic moment of the needle is $x \times 10^{-5}\ \text{Am}^2$; then the value of '$x$' is:

N S B
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Explanation

$T = 5/20 = 0.25$ s; $T = 2\pi\sqrt{I/MB}$ gives $M = 4\pi^2 I/(T^2 B) = 1280\pi^2 \times 10^{-5}$ Am².

NEET 2024
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An unpolarised light beam strikes a glass surface at Brewster's angle. Then

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Explanation

At Brewster's angle the reflected ray is fully plane-polarised; the refracted ray is only partially polarised.

NEET 2024
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Consider the following statements A and B and identify the correct answer:

V I (II) (I) (III) (IV)

A. For a solar-cell, the I-V characteristics lies in the IV quadrant of the given graph.

B. In a reverse biased $pn$ junction diode, the current measured in ($\mu A$), is due to majority charge carriers.

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Explanation

A is correct; B is wrong — reverse-bias current is from minority carriers.

NEET 2024
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A light ray enters through a right angled prism at point P with the angle of incidence $30^\circ$ as shown in figure. It travels through the prism parallel to its base $BC$ and emerges along the face $AC$. The refractive index of the prism is:

A B C P 30°
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Explanation

With right angle at apex A and ray parallel to BC inside, then grazing AC at critical angle: $\tan C = 1/2$, so $n = \sec C = \dfrac{\sqrt 5}{2}$.

NEET 2024
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A particle moving with uniform speed in a circular path maintains:

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Explanation

Velocity and centripetal acceleration both keep changing direction.

NEET 2024
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The graph which shows the variation of $\left(\dfrac{1}{\lambda^2}\right)$ and its kinetic energy, $E$ is (where $\lambda$ is de Broglie wavelength of a free particle):

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Explanation

$E = h^2/(2m\lambda^2)$, so $1/\lambda^2 \propto E$ — straight line through origin.

NEET 2024
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A wire of length '$l$' and resistance $100\ \Omega$ is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:

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Explanation

Each part $= 10\ \Omega$; series of 5 = 50; parallel of 5 = 2; total = 52.

NEET 2024
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The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is $2400\ \text{g cm}^2$. The length of the 400 g rod is nearly:

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Explanation

$L = \sqrt{12 I/M} = \sqrt{72} \approx 8.5$ cm.

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