NEET Physics: Questions 944 - 947 of 2098

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Question number: 944

» Work, Energy and Power » Work Done

MCQ▾

Question

A body is acted upon by a force F =-i + 2j + 3k. The work done by the force in displacing it from (0, 0, 0) to (0, 0, 4m) will be

Choices

Choice (4) Response

a.

10 J

b.

12 J

c.

6 J

d.

8 J

Question number: 945

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

Choices

Choice (4) Response

a.

0.6 m/s

b.

0.3 m/s

c.

0.5 m/s

d.

1.2 m/s

Question number: 946

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball moving with a speed of 9 m/s strikes with an identical stationary ball such that after the collision the direction of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision. Is the kinetic energy conserved in this collision process?

Choices

Choice (4) Response

a.

6 √3 m/s, yes

b.

0, yes

c.

6 √3 m/s, no

d.

3 √3 m/s, no

Question number: 947

» Laws of Motion » Force and Inertia

Assertion-Reason▾

Assertion (Ꭺ)

Block A is moving on horizontal surface towards right under the action of force F. All surfaces are smooth. At the instant shown the force exerted by block A on block B is equal to net force on block B.

Reason (Ꭱ)

From Newton’s third law of motion, the force exerted by block A on B is equal in magnitude to force exerted by block B on A.

Net force acting on each of block A and B

Net Force Acting on Each of Block a and B

Finding force and acceleration on both blocks A and B

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

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