NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 365 - 369 of 2142

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Question number: 365

» Rotational Motion » Torque

MCQ▾

Question

A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m 2 about an axis passing through the center. Angular velocity of the wheel after 3 s will be

Choices

Choice (4) Response

a.

1 rad/s

b.

15 rad/s

c.

10 rad/s

d.

5 rad/s

Question number: 366

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.

Reason (Ꭱ)

Relative velocity is the ratio of two|velocities.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 367

» Rotational Motion » Angular Momentum

MCQ▾

Question

The angular momentum of a system of particles is conserved

Choices

Choice (4) Response

a.

When no external force acts upon the system

b.

When axis of rotation remains same

c.

When no external torque acts upon the system

d.

When no external impulse acts upon the system

Question number: 368

» Rotational Motion » Torque

MCQ▾

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 5Aq in 4 seconds. The magnitude of this torque is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 369

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?

Choices

Choice (4) Response

a.

-49 N

b.

- 19.6 N

c.

-196 N

d.

0.196 N

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