KVPY Stream-SA (Class 11) Physics: Questions 218 - 223 of 242

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Question number: 218

» Oscillations and Waves » Displacement Relation for a Progressive Wave

MCQ▾

Question

When a plane wave travels in a medium, the displacement of particle are given by,

y=0.04sin[2π(4t0.02x)]

Where x and y are in metre and t in second. Frequency of the wave is,

Choices

Choice (4) Response

a.

250msec

b.

100msec

c.

150msec

d.

200msec

Question number: 219

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball of mass 3 kg is in motion and has a momentum 15 kg-m/s. A force of 0.6 N acts on it along the direction of the motion for 15 s. The increase in its kinetic energy is,

Choices

Choice (4) Response

a.

27 J

b.

81 J

c.

9 J

d.

58.5 J

Question number: 220

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 17 of its original value in 4 hours. What will be its activity in 8 hours?

Choices

Choice (4) Response

a.

17

b.

114

c.

121

d.

149

Question number: 221

» Wave Optics » Interference

MCQ▾

Question

The intensity ratio of two interfering beams of light is 9. The value of ImaxIminImax+Imin is –

Choices

Choice (4) Response

a.

35

b.

53

c.

32

d.

3

Question number: 222

» Properties of Solids & Liquids » Specific Heat Capacity

MCQ▾

Question

What is the meaning of Heat capacity of a substance is infinite?

Choices

Choice (4) Response

a.

No change in temperature whether heat is taken in or given out

b.

Heat is taken in

c.

Heat is given out

d.

All of the above

Question number: 223

» Electrostatics » Coulomb's Law

MCQ▾

Question

The excess (equal in number) of electrons that must be placed on each of two small sphered 4.8 cm apart with force of repulsion between sphere to be 1.6 ⨯ 10-20 N, is –

Choices

Choice (4) Response

a.

400

b.

350

c.

275

d.

250

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