CBSE - Motion

1 Motion Pick the false statement

(1) One can calculate uniform acceleration
(2) One can calculate non uniform acceleration from velocity-time graph.
(3) One can calculate velocity from distance-time graph.
(4) One can calculate speed from distance-time graph.

2 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

3 Motion A man is standing on a boat in still water. If he walks towards the shore the boat will -
(1) move away from the shore
(2) remain stationary
(3) move towards the shore
(4) sink

4 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

5 Motion  A body freely falling from rest has a velocity v after it falls through a height h. The distance it has to fall further for its velocity to become double is -

(1)  3 h
(2)  6 h
(3)  8 h
(4)  10 h

6 Motion If car A is at 40 km/h and car B is at 10 km/h in the opposite direction, what is the velocity of the car A relative to the car B?
(1) 20 km/h
(2) 50 km/h
(3) 10 km/h
(4) 40 km/h

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

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

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

10 Motion Area between speed-time graph and time axis gives-

(1)  Distance
(2)  Velocity
(3)  Speed
(4)  None of these