# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1603 - 1607 of 2000

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## Question number: 1603

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MCQ▾

### Question

A particle is moving with the speed more than the speed of sound. That means it is called particle is moving with:

### Choices

Choice (4) Response

a.

Supersonic speed

b.

Infrasonic speed

c.

Sonic speed

d.

Ultrasonic speed

## Question number: 1604

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MCQ▾

### Question

A force acts on a body of mass . The speed of the body changes from to in . Assuming the force to be constant, it magnitude is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1605

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MCQ▾

### Question

Find the time period of a wave whose frequency is ?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1606

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MCQ▾

### Question

The acceleration due to gravity on the surface of moon is of the value on earth. The time period of a simple pendulum of length at the surface of the moon will be:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1607

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MCQ▾

### Question

Two blocks, each of mass are moving in the same straight line but in opposite direction. The speed of first block is and speed of second block is before the collision during which they stick together. After the collision, the velocity of the combination is in direction of . Then what is the value of ?

### Choices

Choice (4) Response

a.

b.

c.

d.

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