CBSE - Motion

1 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

2 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 :

3 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

4 Motion The following position-time graph of an object shows that the body

(1) No such inference can be made from the graph.
(2) Has non-uniform motion.
(3) Has uniform motion.
(4) Is at rest.

5 Motion  A car travels (1 / 4) ^th of a circle with radius r.  The ratio of the distance to its displacement is-

6 Motion In a given velocity-time graph, what happens to velocity between C and D?

(1) Velocity is infinite
(2) Velocity is decreasing
(3) Velocity is increasing
(4) Velocity is constant

7 Motion Which of the following is not characteristic of displacement ?

(1)  It is always positive.
(2)  It has both magnitude and direction.
(3)  It can be zero.
(4)  Its magnitude is less than or equal to the actual path length of the object.

8 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

9 Motion This is a velocity-time graph when the body is under:

(1) Non-uniform retardation.
(2) Uniform acceleration.
(3) Uniform retardation.
(4) Non-uniform acceleration.

10 Motion A body falling from rest describes distances S1, S2 and S3 is the first, second and third seconds of
its fall. Then the ratio of S1:S2:S3 is :
(1) 1 : 1 : 1
(2) 1 : 3 : 5
(3) 1 : 2 : 3
(4) 1 : 4 : 9