NEET Physics: Questions 378 - 381 of 2142

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Question number: 378

» Rotational Motion » Angular Momentum

MCQ▾

Question

Two rigid bodies A and B rotate with rotational kinetic energies E A and E B respectively. The moments of inertia of A and B about the axis of rotation are I A and I B respectively. If I A = I B /8 and E A = 50 E B, the ratio of angular momentum (L A) of A to the angular momentum (L B) of B is

Choices

Choice (4) Response

a.

0. . 25

b.

2.5

c.

1.25

d.

5

Question number: 379

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

If identical charges (-q) are placed at each corner of a cube of side b , then electric potential energy of charge (+q) which is placed at center of the cube will be

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 380

» Communication System » Bandwidth of Signals

MCQ▾

Question

What is the function of a screw gauge in the experiment of determining Young’s modulus of a wire?

Choices

Choice (4) Response

a.

It measures the length of the wire.

b.

It measures the diameter of the wire.

c.

It measures the extension in the wire.

d.

It measures the load applied.

Question number: 381

» Electrostatics » Capacitors

MCQ▾

Question

Figure given below shows two identical parallel plate capacitors connected to a battery with switch S closed. The switch is now opened and the free space between the plates of capacitors is filled with a dielectric of dielectric constant 3. What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric?

Circuit Diagram - Two identical parallel plate capacitors

Circuit Diagram - Two Identical Parallel Plate Capacitors

Two identical parallel plate capacitors connected to a battery with switch S closed.

Choices

Choice (4) Response

a.

5: 1

b.

3: 1

c.

3: 5

d.

5: 3

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