# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 144 - 147 of 253

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## Question number: 144

MCQ▾

### Question

A block, resting on the top of a plane inclined at 450 with the horizontal, slides down with an acceleration of . Calculate the coefficient of kinetic friction.

### Choices

Choice (4) Response

a.

b.

2

c.

d.

## Question number: 145

MCQ▾

### Question

A 15.0 W electrical heater is used to heat a container filled with 0.5 kg of water. It is found that the temperature of the water and the container rise by 4 K in 20 minutes. The container is then emptied, dried, and filled with 3 kg of oil. It is now observed that the same heater raises the temperature of the container-oil system by 3 K in 25 minutes. Assuming no other heat losses in any of the processes, the specific heat capacity of the oil is,

### Choices

Choice (4) Response

a.

1700 JK-1 kg-1

b.

1800 JK-1 kg-1

c.

1900 JK-1 kg-1

d.

1500 JK-1 kg-1

## Question number: 146

MCQ▾

### Question

A point source of light is moving at a rate of 2 cm-s–1 towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at

### Choices

Choice (4) Response

a.

8 cm-s–1 away from the lens

b.

4 cm-s–1 away from the lens

c.

4 cm-s–1 towards the lens

d.

8 cm-s–1 towards the lens

## Question number: 147

MCQ▾

### Question

An open mouthed bottle contains a gas at 500 C. To what temperature should the gas be heated so that half mass of the gas may leave it?

### Choices

Choice (4) Response

a.

3730 C

b.

3800 C

c.

4440 C

d.

3500 C

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