CBSE - Motion

1 Motion A thin uniform metal rod of mass ' m' and length ‘ l’ standing vertically is now allowed to fall due to its own weight.

The velocity with which its mid-point will strike ground will be :

2 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

3 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

4 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

5 Motion The correct velocity-time graph for zero acceleration is:

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

6 Motion 

The acce le ration of the above velocity-time graph is:
(1) Non-uniform.
(2) Zero.
(3) One.
(4) Uniform.

7 Motion A body starts to slide over a horizontal surface with an initial velocity of 0.2 m/s. Due to friction, its velocity decreases at the rate of 0.02 m/s². How much time will it take for the body to stop?
 (1) 10 s
 (2) 15s
 (3) 1s
 (4)  5s

8 Motion A body starts from rest at time t = 0, the acceleration time graph is shown in figure. The maximum velocity attained by the body will be :

(1) 110 m/s
(2) 55 m/s
(3) 650 m/s
(4) 550 m/s

9 Motion When the distance travelled by an object is directly proportional to the time, it is said to travel with-

(1)  zero velocity
(2)  constant speed
(3)  constant acceleration
(4)  uniform velocity

10 Motion Area under a v – t graph represents a physical quantity which has the unit:
(1) m²
(2) m / s
(3) m / s²
(4) m