MCQ : Motion Chapter 8 Science Class 9 Physics
1. If the displacement of an object is proportional to square of time, then the object moves with
(i) uniform velocity
(ii) uniform acceleration
(iii) increasing acceleration
(iv) decreasing acceleration
Answer:
(ii) uniform acceleration
2. From the given v-t graph, it can be inferred that the object is
(i) at rest
(ii) in uniform motion
(iii) moving with uniform acceleration
(iv) in non - uniform motion
Answer:
(ii) in uniform motion
3. Suppose a boy is enjoying a ride on a marry - go - round which is moving with a constant speed of 10 m/s. It implies that boy is
(i) at rest
(ii) moving with no acceleration
(iii) in accelerated motion
(iv) moving with uniform velocity
Answer:
(iii) in accelerated motion
4. A particle is moving in a circular path of radius r.
The displacement after half a circle would be
(i) zero
(ii) πr
(iii) 2r
(iv) 2πr
Answer:
(iii) 2r
5. Which one of the following can sometimes be 'zero' for a moving body ?
(i) average velocity
(ii) distance travelled
(iii) average speed
(iv) displacement
(a) only (i)
(b) (i) and (ii)
(c) (i) and (iv)
(d) only (iv)
Answer:
(c) (i) and (iv)
6. Which of the following statement is correct regarding velocity and speed for moving body ?
(i) velocity of moving body is always higher than its speed
(ii) speed of moving body is always higher than its velocity
(iii) speed of moving body is its velocity in a given direction
(iv) velocity of a moving body is its speed in a given direction
Answer:
(iv) velocity of a moving body is its speed in a given direction
7. The direction of acceleration is the same as the direction of
(i) displacement
(ii) change in velocity
(iii) velocity
(iv) all of these
Answer:
(ii) change in velocity
8. The area under a velocity - time graph gives
(i) distance
(ii) acceleration
(iii) speed
(iv) displacement
Answer:
(d) displacement
9. Which one of the following can be added algebraically
(i) accelerations
(ii) velocities
(iii) distances
(iv) any physical quantities
Answer:
(iii) distances
10. A physical quantity which has both magnitude and direction is called a
(i) scalar quantity
(ii) vector quantity
(iii) neither (a) nor (b)
(iv) either (a) or (b)
Answer:
(ii) vector quantity
11. The distance - time graph of a body moving along a straight path in a single direction with uniform speed will be
(i) along X-axis
(ii) a line with positive slope
(iii) parallel to X-axis
(iv) None of these
Answer:
(ii) a line with positive slope
12. If a body travels unequal distances in equal intervals of time along a ______ path, the body is said to be in _______.
(i) curved , uniform motion
(ii) pentagonal , uniform motion
(iii) rectangular, uniform motion
(iv) straight, non - uniform motion
Answer:
(iv) straight, non - uniform motion
13. A freely falling body is said to be moving with ______.
(i) constant non zero acceleration
(ii) non - uniform motion
(iii) zero velocity
(iv) non - uniform acceleration
Answer:
(i) constant non zero acceleration
14. A body travels along a staright path from its initial position to a point 20 m away and then returns back to its initial position. The change in the position of the body is ____ and the distance travelled is ____.
(i) 20 m, 40 m
(ii) 0 m, 40 m
(iii) 40 m, 40 m
(iv) 0 m, 0m
Answer:
(ii) 0 m, 40 m
15. The slope of velocity - time graph gives ______
(i) distance
(ii) speed
(iii) acceleration
(iv) displacement
Answer:
(iii) acceleration
16. The position - time graph of a body is parabolic , then the body is ______
(i) is in non - uniform motion
(ii) in uniform acceleration
(iii) at rest with some initial distance covered
(iv) at rest with zero initial distance covered
Answer:
(ii) in uniform acceleration
17. A body travelling equal distances in equal intervals of time is said to be moving with unifrom velocity if the body moves along a _____ path.
(i) straight
(ii) rectangular
(iii) circular
(iv) hexagonal
Answer:
(i) staraight
18. The slope of distance - time graph gives ______.
(i) displacement
(ii) acceleration
(iii) velocity
(iv) speed
Answer:
(iv) speed
19. If a body travels equal distances in equal intervals of time, then
(i) the body is moving with uniform velocity
(ii) the body is moving with uniform acceleration
(iii) the body may be moving with uniform velocity
(iv) the body is moving with uniform deceleration
Answer:
(iii) the body may be moving with uniform velocity
20. The distance - time graph of motion of body is parallel to X-axis, then the body is
(i) at rest with zero initial distance covered
(ii) at rest with some initial distance covered
(iii) is non - uniform motion
(iv) uniform acceleration
Answer:
(ii) at rest with some initial distance covered