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Physics MCQs for NEET — Practice Questions with Answers

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NEET 2023
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A bullet from a gun is fired on a rectangular wooden block with velocity $u$. When bullet travels $24\ \text{cm}$ through the block along its length horizontally, velocity of bullet becomes $\dfrac{u}{3}$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is:

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Explanation

$v^2 - u^2 = 2as$. From $u$ to $u/3$ in 24 cm: $\dfrac{8u^2}{9} = 2a(24)$. From $u/3$ to 0: $\dfrac{u^2}{9} = 2a\,s\Rightarrow s = 3$ cm. Total $= 27$ cm.

NEET 2023
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Two thin lenses are of same focal lengths ($f$), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:

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Explanation

$\dfrac{1}{F} = \dfrac{1}{f} - \dfrac{1}{f} = 0\Rightarrow F\to\infty$.

NEET 2023
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In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

n₁ = 1.5 n₂ = 1.6 R₁ R₂ R₁ = R₂ = 20 cm
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Explanation

Power of combination $= (n_g - n_1)/R_1 + (n_2 - n_g)/(-R_2)$ with $n_g = 1.5$, $n_1 = 1.5$, $n_2 = 1.6$, $R_1 = R_2 = 20$ cm gives $F = -100$ cm.

NEET 2023
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A satellite is orbiting just above the surface of the earth with period $T$. If $d$ is the density of the earth and $G$ is the universal constant of gravitation, the quantity $\dfrac{3\pi}{Gd}$ represents:

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Explanation

$T^2 = \dfrac{4\pi^2 R^3}{GM} = \dfrac{4\pi^2 R^3}{G\cdot (4/3)\pi R^3 d} = \dfrac{3\pi}{Gd}$.

NEET 2023
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For the following logic circuit, the truth table is:

A B Y
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Explanation

Two NOT gates feed a NAND: $Y = \overline{\bar A \cdot \bar B} = A + B$ (OR gate by De Morgan).

NEET 2023
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A very long conducting wire is bent in a semi-circular shape from $A$ to $B$ as shown in figure. The magnetic field at point $P$ for steady current configuration is given by:

i → A P R B i ←
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Explanation

Semicircle: $\mu_0 i/(4R)$ out of page. Two semi-infinite straight portions: each $\mu_0 i/(4\pi R)$ into page, total $\mu_0 i/(2\pi R)$. Net $= (\mu_0 i/4R)(1 - 2/\pi)$, out of page.

NEET 2023
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The resistance of platinum wire at $0^\circ$C is $2\ \Omega$ and $6.8\ \Omega$ at $80^\circ$C. The temperature coefficient of resistance of the wire is:

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Explanation

$R_t = R_0(1+\alpha t)\Rightarrow 6.8 = 2(1+80\alpha)\Rightarrow \alpha = 0.03 = 3\times 10^{-2}\ ^\circ\text{C}^{-1}$.

NEET 2023
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10 resistors, each of resistance $R$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is:

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Explanation

Series: $I_s = E/(10R)$. Parallel: $I_p = E/(R/10) = 10E/R$. $n = I_p/I_s = 100$.

NEET 2023
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The radius of inner most orbit of hydrogen atom is $5.3\times 10^{-11}\ \text{m}$. What is the radius of third allowed orbit of hydrogen atom?

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Explanation

$r_n = n^2 r_1$; $r_3 = 9\times 0.53 = 4.77$ Å.

NEET 2023
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A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity $4\ \text{m s}^{-1}$. The ball strikes the water surface after $4\ \text{s}$. The height of bridge above water surface is (Take $g = 10\ \text{m s}^{-2}$):

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Explanation

Taking up positive from bridge: $-h = ut - \tfrac{1}{2}gt^2 = 4(4) - \tfrac{1}{2}(10)(16) = 16 - 80 = -64$, so $h = 64$ m.

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