AIIMS Physics: Questions 299 - 304 of 500

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Question number: 299

» Experimental Skills » Speed of Sound in Air

MCQ▾

Question

The speed of sound in a gas at S. T. P. is 330ms1 and the density of the gas is 1.4kgm3 . Find the number of degrees of freedom of a molecule of the gas.

Choices

Choice (4) Response

a.

6

b.

5

c.

3

d.

4

Question number: 300

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

Two bodies with kinetic energies in the ratio of 4:1 are moving with equal linear momentum. The ratio of their masses is –

Choices

Choice (4) Response

a.

1:1

b.

4:1

c.

1:4

d.

1:2

Question number: 301

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

A radioactive substance decays to 110th of its initial activity in 20 days. The half-life of the radioactive substance expressed in days is –

Choices

Choice (4) Response

a.

2

b.

6

c.

8

d.

12

Question number: 302

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

For sky wave propagation of a 18 MHz signal, what should be the minimum electron density in ionosphere –

Choices

Choice (4) Response

a.

4×1012m3

b.

2×1022m3

c.

9×1014m3

d.

3×106m3

Question number: 303

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

A bullet loses 110th of its velocity when it passes through a plank. Find the maximum number of planks through which it can pass.

Choices

Choice (4) Response

a.

10

b.

5

c.

3

d.

9

Question number: 304

» Kinematics » Relative Velocity

MCQ▾

Question

A boy standing on a long rail road car throws a ball up (straight) with a velocity 19.6ms . The car is moving on the horizontal road with acceleration 3 ms , How far behind the boy will the ball fall?

Choices

Choice (4) Response

a.

12m

b.

8m

c.

24m

d.

48 m

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