Laws of Motion (NEET Physics): Questions 36 - 38 of 116

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Question number: 36

» Laws of Motion » Force and Inertia

MCQ▾

Question

Choose the correct options

(1) A reference frame in which Newton’s first law is valid is’ called an inertial reference frame.

(2) Frame moving at constant velocity relative to a known inertial frame is also an inertial frame.

(3) Ideally, no inertial frame exists in the universe for practical purpose, a frame of reference may be considered as inertial if its acceleration is negligible with respect to the acceleration of the object to be observed.

(4) To measure the acceleration of a falling apple, earth cannot be considered as an inertial frame.

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

Question number: 37

» 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: 38

» 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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