MCQ Questions for Class 9 Science Chapter 8 Motion
Solving the Motion Multiple Choice Questions of Class 9 Science Chapter 8 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Motion Class 9 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 8 Science Class 9 and cross-check your answers during preparation.
Multiple Choice Questions
Question 1.
Who gave the equations of motion for the first time?
(a) Bernhard Nobel
(b) Issac Newton
(c) C. V. Raman
(d) Einstein
Answer
Answer: (b) Issac Newton
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Question 2.
The displacement of the object in a unit time is called:
(a) speed
(b) velocity
(c) acceleration
(d) average speed
Answer
Answer: (b) velocity
Question 3.
The rate of change of velocity per second is known as:
(a) acceleration
(b) speed
(c) average velocity
(d) linear motion
Answer
Answer: (a) acceleration
Question 4.
If the velocity of an object changes from an initial value u to the final value v in time t, the acceleration a will be:
(a) a = \(\frac{v-u}{t}\)
(b) a = \(\frac{v+u}{t}\)
(c) a = \(\frac{t}{v-u}\)
(d) a = \(\frac{t}{v+u}\)
Answer
Answer: (a) a = \(\frac{v-u}{t}\)
Question 5.
What is the unit of acceleration?
(a) m/s
(b) m/s2
(c) ms
(d) m/s3
Answer
Answer: (b) m/s2
Question 6.
The unit of speed and velocity both is:
(a) ms-1
(b) ms-2
(c) ms2
(d) ms
Answer
Answer: (a) ms-1
Question 7.
A particle is moving in a circular path of radius r. The displacement after half a circle would be:
(a) zero
(b) πr
(c) 2r
(d) 2πr
Answer
Answer: (c) 2r
Question 8.
A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is:
(a) u/g
(b) u2/2g
(c) u2/g
(d) u/2g
Answer
Answer: (b) u2/2g
Question 9.
The slope of a velocity-time graph gives:
(a) the distance
(b) the displacement
(c) the acceleration
(d) the speed
Answer
Answer: (c) the acceleration
Question 10.
If the displacement of an object is proportional to the square of time, then the object moves with:
(a) uniform velocity
(b) uniform acceleration
(c) increasing acceleration
(d) decreasing acceleration
Answer
Answer: (b) uniform acceleration
Fill in the Blanks.
Question 11.
Newton’s ________ law is based on the concept of inertia.
Answer
Answer: first
Question 12.
Negative acceleration is known as __________
Answer
Answer: retardation
Question 13.
If the path of a moving object is a straight line then, such a motion is known as a _________
Answer
Answer: linear motion
Question 14.
_______ and ______ laid down the scientific foundation of concept of motion.
Answer
Answer: Galileo, Newton
Question 15.
Velocity is _______ quantity.
Answer
Answer: vector
Question 16.
During the uniform motion of an object along a straight line, the velocity remains _______ with time.
Answer
Answer: constant
Question 17.
The initial velocity of an object moving from the position of rest is _________
Answer
Answer: zero
Question 18.
The displacement of the object in a unit time is called __________
Answer
Answer: velocity
True/False.
Question 19.
Acceleration is a measure of the change in the velocity of an object per unit of time.
Answer
Answer: True
Question 20.
The acceleration of an object is indirectly proportional to the net applied force.
Answer
Answer: False
Question 21.
Motion is a change of position, it can be described in terms of the distance moved or the displacement.
Answer
Answer: True
Question 22.
The simplest type of motion is the motion along a straight line.
Answer
Answer: True
Question 23.
Automobiles are fitted with a device that shows the distance travelled. Such a device is known as an odometer.
Answer
Answer: True
Match the Column.
Question 24.
| A | B |
| 1. C.G.S. unit of acceleration | (i) Distance |
| 2. Motion of a pendulum | (ii) cm/s2 |
| 3. Scalar quantity | (iii) Simple harmonic motion |
| 4. Momentum | (iv) Velocity/time |
| 5. Acceleration | (v) Vector quantity |
Answer
Answer:
| A | B |
| 1. C.G.S. unit of acceleration | (ii) cm/s2 |
| 2. Motion of a pendulum | (iii) Simple harmonic motion |
| 3. Scalar quantity | (i) Distance |
| 4. Momentum | (v) Vector quantity |
| 5. Acceleration | (iv) Velocity/time |
Answer in one Word/Sentence.
Question 25.
Write the unit of momentum.
Answer
Answer: kg m/s or kg ms-1
Question 26.
Give one example of simple harmonic motion.
Answer
Answer: Motion of the pendulum of a clock
Question 27.
A body is moving with constant velocity, then what will be the acceleration of that body?
Answer
Answer: zero (0)
Question 28.
What does the odometer of an automobile measure?
Answer
Answer: The distance travelled
Question 29.
The motion of an athlete moving along a circular path, is an example of what type of motion?
Answer
Answer: An accelerated motion
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