CBSE - Motion

1 Motion 

The speed of the body in the time interval 14 to 18 seconds is
(1) 10 m/s
(2) 0
(3) 12 m/s
(4) 20 m/s

2 Motion The acceleration of an object moving in a straight line can be determined from:
(1) The area between the distance-time graph and time axis.
(2) The area between the velocity-time graph and time axis
(3) The slope of the velocity-time graph.
(4) The slope of the distance-time graph.

3 Motion If you whirl a stone on the end of the string and the string suddenly breaks, the stone will:
  (1) Fly off along the tangent to its circular path.
  (2) Fly directly towards you.
 (3) Spiral away from your hand.
 (4) Spiral in towards your hand.

4 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

5 Motion 

In the distance-time graph of a cyclist, what is happening between B-C and C-D?

(1) B-C: cyclist is coming back to where he started, C-D: cyclist is stationary.
(2) B-C: cyclist is stationary, C-D: cyclist is accelerating.
(3) cyclist is stationary, C-D- speed is increasing
(4) B-C: cyclist is stationary, C-D: cyclist is coming back to where he started.

6 Motion 

The figure above shows distance-time graphs of two objects X and Y. Which object is mov ing
with greater speed?

(1) Both objects are at rest
(2) Both objects are moving with same speed
(3) Object Y
(4) Object X

7 Motion A body of mass 2 kg is free to move along x-axis. It is at rest at t = 0. From t = 0 onwards it is subjected to a time dependent force F(t ) in x-direction. The variation of F with time is as shown :



The change in momentum during journey is (in N-s) :
(1) 4.50
(2) 7.50
(3) 5.06
(4) 14.06

8 Motion The velocity time graph of runner is given in the graph. What is the total distance covered by the runner in 16s?

(1) 100 m
(2) 70 m
(3) 30 m
(4) 130 m

9 Motion The velocity-time graph AC of a moving particle is shown in the figure below. The acceleration of the particle is:

(1) 5 m/s²
(2) 10 m/s²
(3) 20 m/s²
(4) 2.5 m/s²

10 Motion For the velocity time graph shown in figure,

the distance covered by the body in the last two seconds of its motion is what fraction of the total distance covered in all the seven seconds ?

(1)  1/2
(2)  1/4
(3)  1/3
(4)  2/3