CBSE - Motion

1 Motion Which sentence best describes the athlete whose distance-time graph is shown below?

(1) The athlete ran forward for 3 seconds, and then he ran backward for 3 more seconds.
(2) The athlete ran forward for 3 seconds, and then he stood still for 3 more seconds.
(3) The athlete ran forward for 3 seconds, and then he ran forward for 3 more seconds but with a lower speed.
(4) The athlete ran forward for 3 seconds, and then he moved forward for 3 more seconds with a greater speed.

2 Motion Distance covered by a body from velocity-time graph is
(1) Equal to the slope of the graph.
(2) Area under the graph .
(3) Is de note d by a line parallel to the time axis at any point on the distance axis.
(4) Is denoted by a line parallel to the distance axis at any point on the time axis

3 Motion The ratio of the heights from which two bodies are dropped is 3:5 respectively. The ratio of their final velocities is:
 (1) 9 : 25
 (2) √ 3 : √ 5
 (3) 5 : 3
 (4) √5 : √3

4 Motion A quantity has a value of -16 m/s² . It is be the :
(1) Acceleration of an object.
(2) Retardation of an object.
(3) Velocity of an object.
(4) Speed of an object.

5 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

6 Motion Which of the following graphs shows that the body is at rest?


(1) Graph-A
(2) Graph-C
(3) Graph-B
(4) Graph-D

7 Motion The distance travelled by a body is directly proportional to the time, then the body is said to have -

(1)  Zero speed
(2)  Zero velocity
(3)  Constant speed
(4)  None of these

8 Motion At the top of its path a projectile has
(1) no acceleration
(2) acceleration in the upward direction
(3) acceleration in the downward direction
(4) acceleration in the horizontal direction

9 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

10 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