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

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Question number: 183

» Ray Optics » Mirror Formula

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

» Ray Optics » Power of a Lens

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

» Work, Energy and Power » Kinetic Energy

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.

Equation

b.

0

c.

Equation

d.

Equation

Question number: 186

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

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 electronEquation

Choices

Choice (4) Response

a.

8.75 T

b.

9.98 T

c.

11.75 T

d.

10.12 T

Question number: 187

» Work, Energy and Power » Power

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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 188

» Properties of Solids & Liquids » Viscosity

MCQ▾

Question

Under a constant pressure head, the rate of flow of liquid through a capillary tube is Equation . 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.

Equation

b.

Equation

c.

Equation

d.

Equation

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