CBSE NCERT Science Class 9th Test - 1 From Motion

Science Class IXth Test From Physics – Motion

M.M: 38 marks                                                                             Date: 25/06/2011

Time: 70 minutes        

Q 1: Fill in the blanks                                                    (½ mark each x 26 = 13 marks)

1. A body is said to be in ________ when its position changes continuously with respect to a stationary object taken as a reference point.
2. The ______________ travelled by a body is the actual length of the path covered by a moving body irrespective of the direction in which the body travels.
3. _______________ refers to the straight line path between the initial and final positions.
4. A physical quantity having only magnitude or size is known as ______________ quantity.
5. Displacement is a ______________ quantity.
6. The distance travelled by a moving body cannot be ____________ but the final displacement can be __________.
7. A body has _________ motion if it travels equal distances in equal intervals of time, no matter how small these time intervals may be.
8. The motion of a freely falling body is an example of __________________ motion. (more than one word may come).
9. The distance-time graph for a body having _______________ motion is a curved line. (more than one word may come).
10. The non-uniform motion is also called as _______________ motion.
11. ___________ of a body is the distance travelled by it per unit time.
12. The SI unit of distance is _________ and that of time is ______________.
13.  Speed is a ____________ quantity.
14. The ________ _______ of a body is the total distance travelled divided by the total time taken to cover the distance.
15. ______________ of a body is the displacement produced per unit time.
16. A body has a uniform ____________ if it travels in a specified direction in a straight line and moves over equal distances in equal intervals of time, no matter how small these time intervals may be.
17. _____________ of a body is defined as the rate of change of its velocity with time.
18. When a body is moving with uniform velocity, its______________ will be zero.
19. The first equation of motion is _____________ and third equation of motion is ___________________.
20. If a body moves with uniform _____________, its acceleration, a = 0.
21. The distance-time graph of a body can be used to calculate the _____________ of the body.
22. If the speed-time graph of a body is a straight line parallel to the time axis, then the ____________ of the body is constant.
23. In a speed-time graph, the area enclosed by the speed-time curve and the time axis gives the _____________ travelled by the body.
24. In the velocity-time graph of a body, the downward slope of the graph indicates uniform ___________.
25. A ______________ track can be supposed to be made up of an indefinite number of sides.
26. The motion in a circle with constant speed is an example of ____________________ motion.

Q 2: The tip of seconds’ hand of a clock takes 60 second to move once on the circular dial of the clock. If the diameter of the dial of the clock be 21 cm, calculate the speed of the tip of the seconds’ hand of the clock. (Given .                           (2 marks)

Q 3: Derive equation of motion: v2 = u2 + 2as.                                                 (3 marks)

Q 4: A car is moving on a straight road with uniform acceleration. The following table gives the speed of the car at various instants of time:                                       (4 marks)

Speed (m/s)	5	10	15	20	25	30
Time (seconds)	0	10	20	30	40	50

Draw the speed-time graph by choosing a convenient scale. Determine from it:

1. the acceleration of the car.
2. the distance travelled by the car in 50 seconds.

Q 5: A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.       (3 marks)

Q 6: A scooter moving at a speed of 10 m/s is stopped by applying brakes which produce a uniform acceleration of  -0.5 m/s2. How much distance will be covered by the scooter before it stops?                                                                                  (2 marks)

Q 7: What is the SI unit of acceleration?                                                          (1 mark)

Q 8: A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 10 m in 25 seconds to reach the bookshop.  After buying a book, he travels the same distance in the same time to reach back in the classroom. Find:                                                                                                         (3 marks)

1. Average speed, and
2. Average velocity of the boy.

Q 9: In how many ways can velocity of a body be changed? Write in brief.       (2 marks)

Q 10: A scooterist covers a distance of 6 kilometres in 10 minutes. Calculate his speed in:                                                                                                                      (3 marks)

1. centimetres per second (cm/s).
2. metres per second (m/s).
3. kilometres per hour (km/h).                                                                        

Q 11: A body travels a distance of 3 km towards East, then 4 km towards North and finally 9 km towards East.                                                                              (2 marks)

1. What is the total distance travelled?
2. What is the resultant displacement?