1
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic potential energy stored in a certain inductor is $$25 \mathrm{~mJ}$$, when the current in the inductor is $$50 \mathrm{~mA}$$. This inductor is of inductance

A
2.00 H
B
0.20 H
C
200 H
D
20 H
2
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A pendulum is oscillating with frequency '$$n$$' on the surface of the earth. It is taken to a depth $$\frac{R}{2}$$ below the surface of earth. New frequency of oscillation at depth $$\frac{R}{2}$$ is

[ $$R$$ is the radius of earth]

A
$$\mathrm{\frac{n}{3}}$$
B
$$\frac{\mathrm{n}}{\sqrt{2}}$$
C
$$\mathrm{2 n}$$
D
$$\frac{\mathrm{n}}{2}$$
3
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The molar specific heats of an ideal gas at constant pressure and volume are denoted by '$$\mathrm{C}_{\mathrm{p}}$$' and '$$C_v$$' respectively. If $$\gamma=\frac{C_p}{C_v}$$ and '$$R$$' is universal gas constant, then $$C_v$$ is equal to

A
$$\frac{\mathrm{R}}{\gamma-1}$$
B
$$\gamma \mathrm{R}$$
C
$$\frac{1+\gamma}{1-\gamma}$$
D
$$\frac{\gamma-1}{\mathrm{R}}$$
4
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a pure silicon, number of electrons and holes per unit volume are $$1.6 \times 10^{16} \mathrm{~m}^{-3}$$. If silicon is doped with Boron in a way that on doping hole density increases to $$4 \times 10^{22} \mathrm{~m}^{-3}$$. Then electron density in doped semiconductor will be

A
$$6.4 \times 10^{-9} \mathrm{~m}^{-3}$$
B
$$6.4 \times 10^9 \mathrm{~m}^{-3}$$
C
$$6.4 \times 10^{-10} \mathrm{~m}^{-3}$$
D
$$6.4 \times 10^{10} \mathrm{~m}^{-3}$$
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