CBSE - Motion

1 Motion A body is moving along a straight line at 20 ms^–1 undergoes an acceleration of 4 ms After 2 s, its speed will be-

(1)  8 ms^–1
(2)  12 ms^–1
(3)  16 ms^–1
(4)  28 ms^–1

2 Motion How many meters is equal to 1 nanometer?
(1) 10^–9 meter
(2) 10^–10 meter
(3) 10 ⁹ meter
(4) 10¹⁰ meter

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  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

5 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.

6 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

7 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

8 Motion What is true about scalar quantities ?

(1)  Scalars quantities have direction also.
(2)  Scalars can be added arithmetically.
(3)  There are special laws for scalar addition.
(4)  Scalars have special method to represent.

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 

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.