# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 203 - 206 of 253

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## Question number: 203

MCQ▾

### Question

The height of a waterfall is 75 m, If the water at the bottom of the fall is at rest. Calculate the difference between temperature of water at the top and bottom of the fall (specific heat of water and ).

### Choices

Choice (4) Response

a.

0.175 0C

b.

0.97 0C

c.

0.126 0C

d.

0.117 0C

## Question number: 204

MCQ▾

### Question

The transfer ratio β of a transistor is 60. The input resistance of the transistor when used in the common-emitter configuration is 2 KΩ. The peak value of the collector a. c. current for an a. c. input voltage of 0.05 V peak is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 205

MCQ▾

### Question

The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation:

Where, x is in meter and t is sec. The work done by the force in first 7 sec is –

### Choices

Choice (4) Response

a.

4 J

b.

2 J

c.

6 J

d.

0 J

## Question number: 206

MCQ▾

### Question

Two starts each of 1 solar mass are approaching each other for a head-on collision. When they are at a distance of 109 km, their speeds are negligible. The speed with which they collide is –

(The radius of each star is 104 km, assume the stars to remain undistorted until they collide. . )

### Choices

Choice (4) Response

a.

b.

c.

d.

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