AIIMS Physics: Questions 251 - 256 of 500

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Question number: 251

» Kinematics » Relative Velocity

MCQ▾

Question

A bike can be stopped by brakes after at least 10 m, when it moving with a speed of 80kmh . If the same bike is moving with 40kmh , the minimum stopping distance is –

Choices

Choice (4) Response

a.

4m

b.

2m

c.

3m

d.

2.5m

Question number: 252

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

If the equation for the displacement of a particle moving on a circular path is given by θ=3t3+2 , where θ is in radians and t in seconds, then the angular velocity of the particle after 3 s from its start is –

Choices

Choice (4) Response

a.

81rads

b.

27rads

c.

36rads

d.

9rads

Question number: 253

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

MCQ▾

Question

Magnetic permeability is minimum for –

Choices

Choice (4) Response

a.

Diamagnetic substance

b.

Ferromagnetic substance

c.

Paramagnetic substance

d.

None of the above

Question number: 254

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

Force between two identical bar magnets whose centers are a meter apart is 5.4 N when their axes are in same line. If separation is increased to 3a , the force between them is reduced to:

Choices

Choice (4) Response

a.

0.3 N

b.

2.4 N

c.

1.2 N

d.

0.6 N

Question number: 255

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

A radioactive material has a half – life of 8 days. What fraction of the material would remain after 48 days –

Choices

Choice (4) Response

a.

0.156

b.

0.0625

c.

0.625

d.

0.0156

Question number: 256

» Laws of Motion » Centripetal Force

MCQ▾

Question

A body of mass 7 kg is moving in a circle of diameter 2 m with an angular velocity of 5radians . The centripetal force is –

Choices

Choice (4) Response

a.

350 N

b.

75 N

c.

175 N

d.

100 N

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