# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 176 - 182 of 285

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## Question number: 176

» Physics » Force & Laws of Motion

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MCQ▾

### Question

Let force is applied on an object of mass and after increment in its speed, its speed becomes in . Then its initial velocity is:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 177

» Physics » Sound

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MCQ▾

### Question

The speed of sound is maximum in:

### Choices

Choice (4)Response

a.

Same for all matters.

b.

Liquid

c.

Gas

d.

Solid

## Question number: 178

» Physics » Sound

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MCQ▾

### Question

If a speed of a sound is and its wavelength is , then the sound is:

### Choices

Choice (4)Response

a.

Audible

b.

Supersonic

c.

Infrasonic

d.

Ultrasonic

## Question number: 179

» Physics » Sound

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MCQ▾

### Question

Ultrasonic wave are used for detecting object under the water. What technique/device is used for this?

### Choices

Choice (4)Response

a.

Phacoemulsification.

b.

Ultrasonography

c.

d.

Echocardiography

## Question number: 180

» Physics » Work, Energy & Power

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MCQ▾

### Question

A block of mass slides down on an inclined plane of inclination . Find the work done by the weight of the block as it slides through .

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 181

» Physics » Gravitation & Pressure

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MCQ▾

### Question

Which quantity of object is measured by the spring balance?

### Choices

Choice (4)Response

a.

Weight

b.

Mass

c.

Frequency

d.

Acceleration

## Question number: 182

» Physics » Gravitation & Pressure

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MCQ▾

### Question

A body is projected with velocity from the earth. The velocity of the object, at the maximum height reached by it, will be:

### Choices

Choice (4)Response

a.

b.

c.

0

d.

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