KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 173 - 177 of 253

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Question number: 173

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

In an experiment, mass of an object is measured by applying a known force on it, and then measuring its acceleration. If, in the experiment, the measured values of applied force and the measured acceleration are Equation and Equation , respectively, the mass of the object is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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

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