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Force and Laws of Motion Class 9 MCQs Questions with Answers
Solving Force and Laws of Motion Multiple Choice Questions of Class 9 Science Chapter 9 MCQ can be really beneficial because you will be familiar with all of the topics. These MCQ Questions on Force and Laws of Motion Class 9 with answers provide for a quick review of the Chapter, allowing you to have a better understanding of the subject.
Multiple Choice Questions
Question 1.
Rocket works on the principle of conservation of:
(a) mass
(b) energy
(c) momentum
(d) velocity
Answer
Answer: (c) momentum
Question 2.
Among the equal-sized stone and a football, the inertia will be higher of:
(a) football
(b) stone
(c) both
(d) none of them
Answer
Answer: (b) stone
Question 3.
A batsman hits a cricket ball which then rolls on the ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because:
(a) the batsman did not hit the ball hard enough.
(b) velocity is proportional to the force exerted on the ball.
(c) there is a force on the ball opposing the motion.
(d) there is no unbalanced force on the ball so the ball would want to come to rest.
Answer
Answer: (c) there is a force on the ball opposing the motion.
Question 4.
What is the momentum of an object of mass m, moving with a velocity v?
(a) (mv)2
(b) mv2
(c) \(\frac{1}{2}\) mv2
(d) mv
Answer
Answer: (d) mv
Question 5.
Friction is:
(a) useful to us
(b) harmful to us
(c) both useful as well as harmful to us
(d) none of them.
Answer
Answer: (c) both useful as well as harmful to us
Fill in the Blanks.
Question 6.
The SI unit of momentum is _________.
Answer
Answer: kgms-1
Question 7.
The natural tendency of objects to resist a change in their state of rest or of uniform motion is called ______
Answer
Answer: inertia
Question 8.
To every action, there is an ______ and opposite reaction.
Answer
Answer: equal
Question 9.
The resultant force of balanced forces is ________
Answer
Answer: zero
Question 10.
The force can change the motion, direction, or _______ of an object.
Answer
Answer: shape
Question 11.
The value of inertia depends on the _______ of an object.
Answer
Answer: mass
Question 12.
The rate of change of momentum of an object is ______ to the applied unbalanced force in the direction of the force.
Answer
Answer: proportional
True/False.
Question 13.
In 1586, Galileo Galilei wrote his first scientific book ‘The Little Balance’.
Answer
Answer: True
Question 14.
In practical situations, it is difficult to achieve a zero balanced force.
Answer
Answer: False
Question 15.
Force is a scalar quantity.
Answer
Answer: False
Question 16.
The mass of an object is a measure of its inertia.
Answer
Answer: True
Question 17.
In an isolated system, the total momentum remains conserved.
Answer
Answer: True
Match the Column.
Question 18.
| A | B |
| 1. Unit of force | (i) Mass × acceleration |
| 2. Unit of pressure | (ii) kgms-1 |
| 3. Test of purity of milk | (iii) Pascal |
| 4. Force | (iv) Lactometer |
| 5. S.I unit of momentum | (v) Newton |
Answer
Answer:
| A | B |
| 1. Unit of force | (v) Newton |
| 2. Unit of pressure | (iii) Pascal |
| 3. Test of purity of milk | (iv) Lactometer |
| 4. Force | (i) Mass × acceleration |
| 5. SI unit of momentum | (ii) kgms-1 |
Answer in one Word/Sentence.
Question 19.
Write the unit of pressure.
Answer
Answer: Nm-1 or pascal
Question 20.
A body is moving with constant velocity, then what will be the acceleration of that body?
Answer
Answer: Zero (0)
Question 21.
Write the S.I unit of force.
Answer
Answer: Newton
Question 22.
On what factor the inertia of an object depends?
Answer
Answer: On mass
Question 23.
Express the second law of motion of newton in the context of the equation of momentum.
Answer
Answer: Force = \(\frac{\text { Change in momentum } \Delta P}{\text { time }}=\frac{m(v-u)}{t}\)
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