# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 183 - 188 of 253

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## Question number: 183

MCQ▾

### Question

In a concave mirror, an object is placed at a distance 12 cm from the focus and its image is formed at a distance 3 cm from the focus. The focal length of the mirror is,

### Choices

Choice (4) Response

a.

4 cm

b.

5 cm

c.

6 cm

d.

3 cm

## Question number: 184

MCQ▾

### Question

A convex lens of focal length 21 cm and a concave lens of focal length 17 cm are placed in close contact with one another. The power of the combination is –

### Choices

Choice (4) Response

a.

2.43 D

b.

-2.43 D

c.

0.41 D

d.

-1.12 D

## Question number: 185

MCQ▾

### Question

A ball whose kinetic energy is E, is thrown at an angle of 600 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

### Choices

Choice (4) Response

a.

b.

0

c.

d.

## Question number: 186

MCQ▾

### Question

The magnetic field at the center of hydrogen atom due to its revolving electron is –

Given: radius of electronic orbit = 0.67 Å, Velocity of the electron

### Choices

Choice (4) Response

a.

8.75 T

b.

9.98 T

c.

11.75 T

d.

10.12 T

## Question number: 187

MCQ▾

### Question

A person X of mass 81 kg walks up a stair case in 27 sec. Another person Y of mass 63 Kg walks up the same staircase in 7 sec. The ratio of the power generated by X to that by Y is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 188

MCQ▾

### Question

Under a constant pressure head, the rate of flow of liquid through a capillary tube is . If the length of the tube is halved and the diameter of the bore is doubled, the rate of flow will be –

### Choices

Choice (4) Response

a.

b.

c.

d.

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