Class 9th // Physics // Chapter - Motion // Objective Question and Answer
Question 1.If the displacement of an object is proportional to square of time, then the object moves with:
Question 2.Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 20 m/s. It implies that the boy is
Question 3.A particle is moving in a circular path of radius r. The displacement after half a circle would be:
Question 4.Which of the following can sometimes be ‘zero’ for a moving body? i. Average velocity ii. Distance travelled iii. Average speed iv. Displacement
Question 5.When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:
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6. Which of the following is a vector quantity?
(A) mass
(B) Volume
(C) heat
(D) displacement
Answer :- (D) Displacement
7. Which of the following is the unit of acceleration?
(A) meter
(B) Kilogram
(C) Kilometer
(D) meter/second^2
Answer :- (D) meter/second^2
8. What is the unit of velocity?
(A) meter/second
(B) kilogram/second
(C) kilometer/second
(D) None
Answer :- (A) meter/second
9. Result of displacement in any time interval by the object in that time interval:
(A) is always equal to the distance covered
(B) exceeds the distance covered
(C) is always less than the distance covered
(D) may be less than the distance covered
Answer :- (D) may be less than the distance covered
10. The position (x) of a particle moving on a straight line path at time t is, x = 2 t:
(A) The velocity of the particle is the same
(B) Acceleration of the particle is zero
(C) Both (A) and (B) are correct
(D) Both (A) and (B) are wrong
Answer :- (C) Both (A) and (B) are correct.
11. The position of a particle moving on a straight line path at time t is, x = 5t:
(A) Average velocity and velocity are same
(B) Velocity is 5 times the average velocity
(C) The value of average velocity is greater than the value of velocity.
(D) The value of average velocity is smaller than the value of velocity.
Answer :- (A) Average velocity and velocity are same.
12. If x = t^2 then the average velocity of the particle between t = 1second, t = 3second will be :-
(A) 8 m/sec
(B) 4 m/sec
(C) 6 m/sec
(D) 2 m/sec
Answer :- (B) 4 m/sec
13. If the velocity of a particle moving on a straight path at time t is v = 2t, then
(A) Acceleration and average acceleration are same
(B) Acceleration and average acceleration are 2 times
(C)Acceleration is greater than the average acceleration
(D) Acceleration is smaller than the average acceleration
Answer :- (A) Acceleration and average acceleration are same
14. w is the symbol :
(A) Angular displacement
(B) Angular velocity
(C) Angular acceleration
(D) linear velocity
Answer :- (B) Angular velocity
15. Odometer measures
(A) move
(B) distance
(C) time
(D) Average speed
Answer :- (B) Distance
16. If the displacement of an object is zero then the distance covered by that object is:
(A) zero
(B) not zero
(C) negative
(D) may be zero or not zero
Answer :- (D) may be zero or not zero
17. A boy reaches school from his home in 1/4 hour at an average speed of 4 km/h. The distance from his house to the school is:
(A) 2 km
(B) 8 km
(C) 1 km
(D) 16 km
Answer :- (C) 1 km
18. Both force and displacement are vectors, then the work which is the product of force and displacement is:
(A) is a vector
(B) is scalar
(C) Neither a vector nor a scalar
(D) is only a number
Answer :- (B) is scalar
19. How much distance will a car traveling at a speed of 36 km/h cover in 1 second?
(A) 5 m
(B) 10 m
(C) 15 m
(D) 20 m
Answer :- (B) 10 m
20. If the distance covered by an object is directly proportional to time, then we can say that
(A) The velocity of the object is zero
(B) The object is moving with uniform speed
(C) The acceleration of the object is constant
(D) The velocity of the object is uniform
Answer :- (B) The object is moving with uniform speed.
21. If the distance covered by an object is directly proportional to the square of time, then it can be said that:
(A) The object is moving with zero velocity
(B) The object is moving at a constant speed
(C) The acceleration of the object is constant
(D) The velocity of the object is uniform
Answer :- (C) Acceleration of the object is constant
22. The path of motion of a particle in uniformly accelerated motion can be:
(A) straight line
(B) Parabola
(C) both
(D) There is no one
Answer :- (C) Both
23. Acceleration in uneven circular motion is:
(A) In the direction of velocity
(B) in the direction opposite to the velocity
(C) Perpendicular to velocity
(D) None
Answer :- (D) None
24. Acceleration in uniform circular motion is:
(A) In the direction of velocity
(B) in the direction opposite to the velocity
(C) Perpendicular to velocity
(D) None
Answer :-(C) Perpendicular to velocity
25. Position (x) time (t) is obtained from the graph:
(A) Velocity
(B) Acceleration
(C) both
(D) None of these
Answer :- (A) Velocity
26. Velocity (v) time (t) graph is obtained from:
(A) displacement
(B) Acceleration
(C) both
(D) None of these
Answer :- (C) Both
27. Acceleration (a) time (t) is obtained from the graph:
(A) velocity change
(B) displacement
(C) both
(D) None of these
Answer :- (A) Velocity change
28. Average speed is :
(A) Ratio of displacement and time interval
(B) Ratio of distance covered and time interval
(C) Ratio of distance covered and displacement
(D) None of these
Answer :- (B) Ratio of distance covered and time interval
29. Average velocity is:
(A) Ratio of displacement and time interval
(B) Ratio of distance covered and time interval
(C) Ratio of distance covered and displacement
(D) None of these
Answer :- (A) Ratio of displacement and time interval
30. Average velocity is equal to average speed:
(A) In rectilinear motion
(B) In circular motion
(C) in zigzag motion
(D) None of these
Answer :- (A) Straight line in motion
