KVPY Stream-SA (Class 11) Physics: Questions 174 - 179 of 252

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Question number: 174

» Electronic Devices » Junction Transistor

MCQ▾

Question

In a PNP transistor circuit the collector current is 20 mA. If 80 % of the electrons emitted reach the collector, the value of α and IB are respectively –

Choices

Choice (4) Response

a.

0.8, 5

b.

0.7, 11

c.

0.9, 10

d.

0.6, 7

Question number: 175

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body moving on a rough horizontal surface comes to a stop in a distance 22 m. If the initial kinetic energy is 66 J, the force of the friction exerted on the body is –

Choices

Choice (4) Response

a.

3 N

b.

2 N

c.

5 N

d.

4 N

Question number: 176

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

92U238 atom disintegrates to 89Ac226 with a half-life of 4.7 ⨯ 109 years by emitting three alpha and n beta particles. Here n is –

Choices

Choice (4) Response

a.

2

b.

3

c.

4

d.

5

Question number: 177

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A body moving in a straight line covers a distance of 16 m in the 3th second and 24 m in 7th sec. Distance will it cover in 5th second is –

Choices

Choice (4) Response

a.

11

b.

23

c.

20

d.

17

Question number: 178

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 3 kg slides on an inclined plane making an angle of 300 with the horizontal. The coefficient of friction between the block and the surface is 23 . The force required to be applied to the block so that it moves down without any acceleration is –

Choices

Choice (4) Response

a.

2.27

b.

3.25

c.

2.0

d.

1.87

Question number: 179

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball whose kinetic energy is E, is thrown at an angle of 300 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

Choices

Choice (4) Response

a.

E2

b.

3E4

c.

3E

d.

E3

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