NEET Physics: Questions 187 - 191 of 2099

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Question number: 187

» Laws of Motion » Centripetal Force

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.

4.15×108N

b.

3.8×108N

c.

2.07×108N

d.

8.3×108N

Question number: 188

» Kinematics » Motion in a Straight Line

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: 189

» Kinematics » Average Speed and Instantaneous Velocity

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.

100 rad/s

b.

50 rad/s

c.

25 rad/s

d.

75 rad/s

Question number: 190

» Laws of Motion » Centripetal Force

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: 191

» Laws of Motion » Centripetal Force

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.

4π2mkl0n2(k+4π2mn2)

b.

2πmkl0n2(k4π2mn2)

c.

2π2mkl0n2(k4π2mn2)

d.

4π2mkl0n2(k4π2mn2)

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