NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 442 - 445 of 2320

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Question number: 442

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MCQ▾

Question

A mass of 60 kg is on the floor of a lift moving down. The lift moves at first with an acceleration of 3 m/sec 2, then with constant velocity and finally with a retardation of 3m/sec2. Choose the correct options related to possible reactions exerted by the lift on the body in each part of the motion –

Select the correct answers and mark it according to the following

1. 408 N
2. 588 N
3. 768 N
4. 508 N

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 3 are correct

Question number: 443

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Question

The roadway bridge over a canal is the form of an arc of a circle of radius 25 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s 2)

Choices

Choice (4)Response

a.

17.556 m/s

b.

39.899 m/s

c.

49.49 m/s

d.

45.76 m/s

Question number: 444

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MCQ▾

Question

An automobile engine develops 100 kW when rotating at a speed of 1500 rev/min. What torque does it deliver?

Choices

Choice (4)Response

a.

531 N-m

b.

350 N-m

c.

440 N-m

d.

637 N-m

Question number: 445

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MCQ▾

Question

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to

Choices

Choice (4)Response

a.

p and r -2

b.

p -1 and r -2

c.

P 2 and r -3

d.

p and r -3

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