# AIIMS (All India Institute of Medical Sciences) Physics: Questions 383 - 387 of 500

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## Question number: 383

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Appeared in Year: 1998

Assertion-Reason▾

### Assertion (Ꭺ)

Sound waves cannot propagate through vacuum but light waves can.

### Reason (Ꭱ)

Sound waves cannot be polarized but light waves can be.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

## Question number: 384

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Edit
MCQ▾

### Question

The vector and are perpendicular to each other. The positive value of is:

### Choices

Choice (4)Response

a.

5

b.

0

c.

3

d.

1

## Question number: 385

Edit
MCQ▾

### Question

In the figure given below, the position – time graph of a particle of mass 0.5 kg is shown. The impulse at t = 3 sec is –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 386

Edit
MCQ▾

### Question

If the radius of a planet is R and density of same planet is , another planet having radius and density and respectively; then the ratio of accelerations due to gravity of these both planet is –

### Choices

Choice (4)Response

a.

b.

c.

4

d.

6

## Question number: 387

Edit
MCQ▾

### Question

How far will a body free – fall in 2 second if released from rest?

### Choices

Choice (4)Response

a.

0.0 m

b.

9.8 m

c.

4.9 m

d.

19.6 m

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