NEET Physics: Questions 277 - 281 of 2099

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Question number: 277

» Kinematics » Average Speed and Instantaneous Velocity

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.

400 N

b.

40 N

c.

4.8 N

d.

480 N

Question number: 278

» Electrostatics » Electric Potential

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.

kQql

b.

Zero

c.

kQqlw

d.

kQql2

Question number: 279

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

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.

2i + 3j

b.

6i + 9j

c.

1/3 (G + 3)

d.

(3i + 2j)

Question number: 280

» Electrostatics » Gauss's Law

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

b.

x 2

c.

1x

d.

1x2

Question number: 281

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A mass of 10 kg is hung to a spring balance in lift. If the lift is moving with an acceleration g/3 in upward & downward directions, choose the correct options related to the reading of the spring balance.

  1. 13.3 kg
  2. 66.7 kg
  3. 32.6 kg
  4. 0

Select the correct answers and mark it according to the following

Choices

Choice (4) Response
a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

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