NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 276 - 280 of 2320

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Question number: 276

» Rotational Motion » Torque

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MCQ▾

Question

Find the torque of a force F =- i + 2 j + 3 k acting at the point r = i + 3 j + 5k

Choices

Choice (4)Response

a.

-i - 8j + 5k

b.

7i - 19j + 19k

c.

14i - 38j + 16k

d.

-21i + 3j + 5k

Question number: 277

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A cricket ball of mass 200 g is moving with a velocity of 12m/sec and is hit by a bat so that the ball is turned back with a velocity of 24 m/sec; the force on the ball acts for 0.5 sec, then the average force exerted by the bat on the ball will be

Choices

Choice (4)Response

a.

480 N

b.

400 N

c.

4.8 N

d.

40 N

Question number: 278

» Electrostatics » Electric Potential

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MCQ▾

Question

A charge (-q) and another charge (+Q) are kept at two points A and B respectively. Keeping the charge (+Q) fixed at B, the charge (-q) at A is moved to another point C such that ABC forms an equilateral triangle of side l. The net work done by electrostatic field in moving the charge (-q)

Choices

Choice (4)Response

a.

Zero

b.

c.

d.

Question number: 279

» Kinematics » Uniform and Non-Uniform Motion

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Question

A body whose mass 4 kg is acted upon by two forces (8i + 10j) N and (4i + 8j) N. The acceleration produced will be (in m/s 2) -

Choices

Choice (4)Response

a.

(3i + 2j)

b.

6i + 9j

c.

2i + 3j

d.

1/3 (G + 3)

Question number: 280

» Electrostatics » Gauss's Law

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MCQ▾

Question

A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its center, for x < R, the electric field is directly proportional to

Choices

Choice (4)Response

a.

x 2

b.

c.

d.

x

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