# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 155 - 158 of 268

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## Question number: 155

Appeared in Year: 2015

MCQ▾

### Question

A cubical vessel has opaque walls. An observer (dark circle in figure below) is located such that she can see only the all CD but not the bottom. Nearly to what height should water be poured so that she can see an object placed at the bottom at a distance of 10 cm from the corner C? Refractive index of water is 1.33.

### Choices

Choice (4) Response

a.

10 cm

b.

45 cm

c.

27 cm

d.

16 cm

## Question number: 156

MCQ▾

### Question

An object is tied to a string and rotated in a vertical radius r. Constant speed is maintained along the trajectory. If, then, is –

(T indicates tension in the string)

### Choices

Choice (4) Response

a.

1

b.

3

c.

4

d.

2

## Question number: 157

MCQ▾

### Question

A block of mass 15 kg slides down a rough slope which is inclined at 600 to the horizontal. The coefficient of sliding friction is 0.25. When the block has slid 10 m, the work done on the block by the force of friction is nearly,

### Choices

Choice (4) Response

a.

b.

c.

d.

115.75 J

## Question number: 158

MCQ▾

### Question

A bob of mass 0.575 kg hangs from the massless string of a long simple pendulum. A bullet of mass 0.025 kg is fired vertically from below into the bob. The bullet gets embedded into the bob and the combination rises vertically through a height of 0.8 m. If g = 10 ms-2, then the velocity of the bullet is –

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page