NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 321 - 324 of 2142

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Question number: 321

» Kinematics » Motion in a Plane

MCQ▾

Question

A man whirls a stone round his head on the end of a string 4.0 metre long. Can the string be in a horizontal, plane? If the stone has a mass of 0.4 kg and the string will break, if the tension in it exceeds 8 N. The smallest angle the string can make with the horizontal and the speed of the stone will respectively be (Take g = 10 m/sec 2)

Choices

Choice (4) Response

a.

45°, 8.2 m/s

b.

60°, 7.7 m/s

c.

60°, 8.7 m/s

d.

30°, 7.7 m/s

Question number: 322

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A disc of mass 5 gm is kept horizontally in air by firing bullets of mass 10 g each at the rate of 20/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –

Choices

Choice (4) Response

a.

9.28 cm/s

b.

1.25 cm/s

c.

1.96 cm/s

d.

4.89 cm/s

Question number: 323

» Laws of Motion » Force and Inertia

MCQ▾

Question

A cane filled with water is revolved in a vertical circle of diameter 2 m and the water does not fall down n maximum period of revolution must be –

Choices

Choice (4) Response

a.

14.15

b.

4.02

c.

1.45

d.

2.006

Question number: 324

» Properties of Solids & Liquids » Temperature

MCQ▾

Question

The temperature-time variation graphs, as obtained by four students 1, 2, 3 and 4 are as shown. The graphs, likely to be wrong are

Choices

Choice (4) Response

a.

 temperature → time - choice A

Temperature → Time - Choice A

shows the curve of temperature → time.

b.

temperature → time -Choice B

Temperature → Time -Choice B

shows the curve of temperature → time.

c.

temperature → time -Choice C

Temperature → Time -Choice C

shows the curve of temperature → time.

d.

temperature → time - choice D

Temperature → Time - Choice D

shows the curve of temperature → time.

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