MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion

MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion

Here we are providing MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion. These questions are prepared by subject expert and is very useful for exams. Students can practice these questions for better understanding, and this will help them in scoring well in exams.

Q.1 A force of 100 N acts on 50 kg for 2 seconds. The same force acts on 25 kgs for 2 seconds. The ratio of the momenta produced, and the accelerations caused in two bodies respectively are–
(A) 1 : 1, 2 : 1
(B) 1 : 1, 1 : 2
(C) 1 : 2, 1 : 1
(D) none of these

Check Answer

Answer: (B)

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Q.2 The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. The average retarding force on the vehicle? The mass of the three-wheeler is 335 kg and mass of the driver is 65 kg.
(A) 1025 N
(B) 10 N
(C) 1000 N
(D) None of these

Check Answer

Answer: (C)

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Q.3 A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m/s, the recoil speed of the gun –
(A) 14 m/s
(B) 0.012 m/s
(C) 0.016 m/s
(D) 100 m/s

Check Answer

Answer: (C)

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Q.4 If a body is in equilibrium under a set of non-collinear forces, the minimum number of forces has to be:
(A) Four
(B) Three
(C) Two
(D) Five

Check Answer

Answer: (B)

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Q.5 A force of 50 dynes is acted on a body of mass 5g which is at rest for an interval of 3sec. The impulse is
(A) 0.15 × 10^–3 Ns
(B) 0.98 × 10^–3 Ns
(C) 1.5 × 10^–3 N.s
(D) 2.5 × 10^–3

Check Answer

Answer: (C)

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Q.6 Swimming is possible by the:
(A) first law of motion
(B) second law of motion
(C) third law of motion
(D) Newtons law of gravitation

Check Answer

Answer: (C)

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Q.7 A cricket player catches a ball of mass 0.1 kg, moving with a speed 10 m/s in 0.1 second. Force exerted by him is (N)
(A) 4
(B) 2
(C) 1
(D) 10

Check Answer

Answer: (D)

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Q.8 A man is at rest in the middle of pond on perfectly smooth ice. He cannot himself to the shore by making use of Newton’s:
(A) First
(B) Second
(C) Third
(D) All the laws

Check Answer

Answer: (C)

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Q.9 Inertia is that property of a body by virtue of which the body is:
(A) Unable to change by itself its state of rest
(B) Unable to change by itself its state of uniform motion
(C) Unable to change by itself its direction of motion
(D) All the above

Check Answer

Answer: (D)

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Q.10 Which of the following has the largest inertia?
(A) A pin
(B) A pen
(C) Your physics book
(D) Your school bag

Check Answer

Answer: (D)

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