# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 218 - 223 of 253

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## Question number: 218

MCQ▾

### Question

When a plane wave travels in a medium, the displacement of particle are given by,

Where x and y are in metre and t in second. Frequency of the wave is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 219

MCQ▾

### Question

A ball of mass 3 kg is in motion and has a momentum 15 kg-m/s. A force of 0.6 N acts on it along the direction of the motion for 15 s. The increase in its kinetic energy is,

### Choices

Choice (4) Response

a.

27 J

b.

81 J

c.

9 J

d.

58.5 J

## Question number: 220

MCQ▾

### Question

The activity of a radioactive sample reduces to of its original value in 4 hours. What will be its activity in 8 hours?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 221

MCQ▾

### Question

The intensity ratio of two interfering beams of light is 9. The value of is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 222

MCQ▾

### Question

What is the meaning of Heat capacity of a substance is infinite?

### Choices

Choice (4) Response

a.

No change in temperature whether heat is taken in or given out

b.

Heat is taken in

c.

Heat is given out

d.

All of the above

## Question number: 223

MCQ▾

### Question

The excess (equal in number) of electrons that must be placed on each of two small sphered 4.8 cm apart with force of repulsion between sphere to be 1.6 ⨯ 10-20 N, is –

### Choices

Choice (4) Response

a.

400

b.

350

c.

275

d.

250

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