KVPY Stream-SA (Class 11) Physics: Questions 164 - 169 of 252

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Question number: 164

» Kinematics » Relative Velocity

MCQ▾

Question

A train of length l (165 m) is going towards north directional constant speed v1=12 m/s. A parrot flies at a constant speed of v2 = 3 m/s towards south parallel to be railway track. The time taken by the parrot to cross the train is –

Choices

Choice (4) Response

a.

15 s

b.

18 s

c.

11 s

d.

9 s

Question number: 165

» Kinetic Theory of Gases » Equation of State of a Perfect Gas

MCQ▾

Question

If for a gas RCV=0.33 , The atomicity of the gas is-

Choices

Choice (4) Response

a.

Triatomic

b.

Diatomic

c.

Cannot determine

d.

Monoatomic

Question number: 166

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 15 of its original value in 9 hours. What will be its activity in 27 hours?

Choices

Choice (4) Response

a.

1125

b.

17

c.

1124

d.

121

Question number: 167

» Kinematics » Projectile Motion

MCQ▾

Question

The maximum height attained by a projectile is increased by 15 % by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be –

Choices

Choice (4) Response

a.

20 %

b.

10%

c.

15%

d.

5%

Question number: 168

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation: t=x+2

Where, x is in meter and t is sec. The work done by the force in first 4 sec is –

Choices

Choice (4) Response

a.

6 J

b.

4 J

c.

8 J

d.

0

Question number: 169

» Kinematics » Relative Velocity

MCQ▾

Question

A boat crossing a river moves with a velocity v relative to still water. The river is flowing with a velocity v2 with respect to the bank. The angle with respect to the flow direction with which the boat should move to minimize the drift is–

Choices

Choice (4) Response

a.

1350

b.

600

c.

300

d.

1200

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