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Physics practice test MCQ: to every action there is always an equal but opposite reaction, this statement is known as with options newton's 2nd law of motion, newton's 1st law of motion, newton's 3rd law of motion and law of momentum with physics practice tests starting from what is physics to all topics of class 9 physics. Free physics revision notes to learn physics classroom quiz with MCQs to find questions answers based online learning tests.

MCQ: To every action there is always an equal but opposite reaction, this statement is known as

1. newton's 2nd law of motion
2. newton's 1st law of motion
3. newton's 3rd law of motion
4. law of momentum

C

MCQ: Two masses 7.5 kg and 6.7 kg are attached to ends of an inextensible string passes over a frictionless pulley. Its tension when both masses are moving vertically will be equal to

1. 50 N
2. 70.7 N
3. 65.6 N
4. 45 N

B

MCQ: When donkey pulls a cart, action is on the

1. cart
2. donkey
3. earth
4. earth and cart

B

MCQ: Two masses 4.5 kg and 3.8 kg are attached to ends of an inextensible string passes over a frictionless pulley. Its acceleration when both masses are moving vertically will be equal to

1. 0.8 ms−2
2. 0.5 ms−2
3. 2 ms−2
4. 1.5 ms−2

A

MCQ: When a force acts on a body, it produces an acceleration in body and will be equal to rate of change of

1. velocity of the body
2. displacement of the body
3. inertia of the body
4. momentum of the body

D