NEET Physics: Questions 186 - 190 of 2142

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Question number: 186

MCQ▾

Question

An electron is moving in a circular orbit of radius 5.3 x 10 -11 metre around the atomic nucleus at a rate of 6.6 x 1015 revolutions per second. The centripetal force acting on the electron will be -

(The mass of the electron is 9.1 x 10 - 31kg)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 187

MCQ▾

Question

A motor car is travelling at 50 m/s on a circular road of radius 600 m. It is increasing its speed at the rate of 4 m/s 2. Its net acceleration is (in m/s 2) –

Choices

Choice (4) Response

a.

4.8

b.

5.7

c.

2

d.

0

Question number: 188

MCQ▾

Question

A particle moves in a circle of radius 20cm with a linear speed of 10m/s. The angular velocity will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 189

MCQ▾

Question

The maximum speed at which a car can turn round a curve of 40 metre radius on a level road if the coefficient of friction between the tyres and the road is 0.6, will be –

Choices

Choice (4) Response

a.

15.3 m/s

b.

9.0 m/s

c.

10.8 m/s

d.

17.8 m/s

Question number: 190

MCQ▾

Question

A smooth table is placed horizontally and a spring of unstarched length 0 and force constant k has one end fixed to its center. To the other end of the spring is attached a mass m which is making n revolution per second around the center. Tension in the spring will be

Choices

Choice (4) Response

a.

b.

c.

d.

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