KVPY Stream-SA (Class 11) Physics: Questions 216 - 219 of 252

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Question number: 216

» Wave Optics » Interference

MCQ▾

Question

In a Young’s experiment, the interference pattern is found to have an intensity ratio between the bright and dark fringes as 36. The intensity ratio of the two interfering light waves is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 217

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

A soldier with a machine gun, falling from an airplane gets detached from his parachute. He is able to resist the downward acceleration if the shoots 60 bullets a second at the speed of 450 m/s. If the weight of a bullet is 53 gm, what is the weight of the man with the gun? Ignore resistance due to air and assume the acceleration due to gravity g = 9.8 ms–2

Choices

Choice (4) Response

a.

112 kg

b.

152 kg

c.

146 kg

d.

136 kg

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,

Equation

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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

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