NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 151 - 155 of 2320

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Question number: 151

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MCQ▾

Question

The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t –t 2 during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 152

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MCQ▾

Question

A cane filled with water is revolved in a vertical circle of radius 4 m and water just does not fall down. The time period of revolution will be -

Choices

Choice (4)Response

a.

1 s

b.

8 s

c.

10 s

d.

4 s

Question number: 153

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MCQ▾

Question

The path followed by a body projected along y axis is given by y = √3 x - (1/2) x2. If g = 10 m/s2, then the initial velocity of projectile will be - (x and y are in m)

Choices

Choice (4)Response

a.

3 √10 m/s

b.

10 √2 m/s

c.

10 √3 m/s

d.

2 √10 m/s

Question number: 154

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MCQ▾

Question

A body of mass 4 kg lying on a smooth surface is attached to a string 6 m long and then whirled round in a horizontal circle making 60 revolution per minute. The centripetal acceleration will be

Choices

Choice (4)Response

a.

23.68 m/s 2

b.

236.6 m/s 2

c.

2.368 m/s 2

d.

1.18 m/s 2

Question number: 155

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MCQ▾

Question

The length of second’s hand in a watch is 1 cm. The change in velocity of its tip in 15 second is –

Choices

Choice (4)Response

a.

b.

c.

0

d.

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