CBSE - Motion

1 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

2 Motion A body is dropped from certain height from a uniformly ascending balloon. The correct graph showing variation of velocity with time for body is :

3 Motion A stone is dropped from the top of a tower. Its velocity after it has fallen 20 m is (take g = 10m/s²)
(1) –10 m/s (2) 10 m/s (3) – 20 m/s (4) 20 m/s

4 Motion 

The relation among v, w  and r is -
(1) w = v / r
(2) v = w  / r
(3) w  = r / v
(4) None of these

5 Motion The area enclosed by velocity-time graph and the time axis will be equal to the magnitude of
(1) displacement
(2) speed
(3) acceleration
(4) distance

6 Motion The slope of the distance-time graph is:

(1) Distance
(2) acceleration
(3) Speed
(4) Displacement

7 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

8 Motion 

In a circular path of radius 1 m, a mass of  2 kg moves with a constant speed of 10 ms^–1 .The angular speed in radian/sec. is -
(1) 5
(2) 10
(3) 15
(4) 20

9 Motion What is the speed of the object in the 10 second interv al from 40-50 seconds?

(1) 2 m/s
(2) 1 m/s
(3) 0.25 m/s
(4) 0.5 m/s

10 Motion If car A is at 80 km/h and car B is at 60 km/h in the same direction, what is the velocity of thecar A relative to the car B?
(1) 40 km/h
(2) 20 km/h
(3) 10 km/h
(4) 30 km/h