CBSE - Motion

1 Motion What is the position of the body in the time interval 60-70 seconds?

(1) 15 m
(2) 5 m
(3) 10 m
(4) 20 m

2 Motion  An object travels 20 m in 5 sec and then another 40 m in 5 sec. What is the average speed of the object?
(1) 6 m/s
(2) 2 m/s
(3) 12 m/s
(4) 0 m/s

3 Motion If the velocity-time graph of an object is not a straight line , then its acceleration is:
(1) Variable
(2) Positive
(3) Zero
(4) Negative

4 Motion A boy is running along a circular track of radius 7 m. He completes one circle in 10 second. The average velocity of the boy is -

(1)  4.4 ms^–1
(2)  0.7 ms^–1
(3)  Zero
(4)  70 ms^–1

5 Motion A person takes time t to go once around a circular path of diameter 2R. The speed (v) of this person would be -
(1) t / 2pR
(2) 2pR / t
(3) pR² / t
(4) 2 pRt

6 Motion For a body performing motion with uniform speed, the distance-time graph is:

(1) Straight line parallel to y-axis
(2) Straight line inclined to the time axis
(3) Straight line parallel to x-axis
(4) Curved line

7 Motion Two bodies in circular paths of radii 1 : 2 take same time to complete their circles. The ratio of their linear speeds is-

(1)  1 : 2
(2)  2 : 1
(3)  1: 3
(4)  3 : 1

8 Motion Without actually calculating the speed, can you guess in which time interval is the body moving fastest?

(1) 20-40 s
(2) 40-50 s
(3) 90-100 s
(4) 80-90 s

9 Motion The motion represented by the displacement-time graph below is:

(1) Uniform-motion with zero initial displacement.
(2) Non-uniform motion with finite value of initial displacement.
(3) Non-uniform motion with zero initial displacement.
(4) Uniform-motion with finite value of initial displacement.

10 Motion The brakes applied to a car produce a negative acceleration of 6ms^–2  If the car stops after 2 seconds, the initial velocity of the car is -

(1)  6 ms^–1
(2)  12 ms^–1
(3)  24 ms^–1
(4)  Zero