NEET Physics: Questions 392 - 396 of 2098

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Question number: 392

» Rotational Motion » Angular Momentum

MCQ▾

Question

Calculate the angular momentum of a body whose rotational energy is 5 joule. If the angular momentum vector coincides with the axis of rotation and its moment of inertia about this axis is 3 x 10 -8 kg m 2

Choices

Choice (4) Response

a.

4 x 10 -3 kg m 2 /s

b.

5.47 x 10 -2 kg m 2 /s

c.

2 x 10 -3 kg m 2 /s

d.

Question does not provide sufficient data or is vague

Question number: 393

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Four charges + q, -q, + q and -q are put together on four corners of a square as shown in figure. The net electrostatic energy of the system is,

Square with Four charges + q, -q, + q and -q

Square With Four Charges + Q, -Q, + Q and -Q

Four charges + q, -q, + q and -q are put together on four corners of a square

Choices

Choice (4) Response

a.

Zero

b.

2kq2a

c.

2kq2a

d.

All of the above

Question number: 394

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 20 kg moving with a velocity of 3 m/s, rebounds on a wall with same velocity. The impulse on the body is -

Choices

Choice (4) Response

a.

60 Ns

b.

120 Ns

c.

30 Ns

d.

180 Ns

Question number: 395

» Laws of Motion » Force and Inertia

MCQ▾

Question

A body of mass 15 kg moving with a velocity of 10 m/s is to be stopped by a resistive force in 15 sec, the force will be

Choices

Choice (4) Response

a.

5 N

b.

10 N

c.

50 N

d.

100 N

Question number: 396

» Laws of Motion » Force and Inertia

MCQ▾

Question

In the arrangement shown in fig. the ends P and Q of an un stretchable string move downwards with a uniform speed U. Pulleys A and B are fixed. Mass M moves upwards with a speed of

Pulley system with mass is M and speed is U

Pulley System With Mass Is M and Speed Is U

In this figure we show the pulleys system, mass is M and speed is U.

Choices

Choice (4) Response

a.

2U cos θ

b.

U/cos θ

c.

U cos θ

d.

2U/cos θ

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