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CBSE Class 9 Science Worksheet

Unit 3-Motion, Force and Work - Motion

1.

A train covers a certain distance at a speed of 20 km/hr and returns back through the same distance at a speed of 30 km/hr. What is the average speed of the train for the whole journey? 

A)

22 km/hr

 B)

29 km/hr

 C)

24 km/hr

 D)

25 km/hr
2.
Fill in the blanks: A particle is moving in a circular path of radius r. The displacement after full circle would be ________.
3.

From the following acceleration vs time graph determine the time period during which velocity of the body is constant?

A)

t = 2 to 4 seconds

 B)

t= 0 to 2 seconds

 C)

t= 5 to 6 seconds

 D)

t= 6 to 7 seconds
4.
Choose the correct option: The numerical ratio of displacement to distance for a moving object is ________.
A) equal or less than1 B) equal or greater than1 C) always greater than 1 D) always equal to 1
5.
What is the displacement and distance covered by the car which moves in a circular road of radius R when it covers half the circle?
6.
State true or false: The displacement of a moving object in a given interval of time is zero. Then the distance travelled by the object is also must be zero.
A) true B) false
7.
What is the path of motion of projectile?
A) curved B) straight C) circular D) helical
8.
Fill in the blanks: __________ quantity gives both direction and magnitude.
9.

A car has a uniform accleration of . Calculate the distance travelled by the car after 10 seconds of start?

10.
Fill in the blanks: ____________ is measured by the odometer of an automobile.
11.
Fill in the blanks: Distance covered by a freely falling body in 2 seconds will be __________.
A) 9.8m B) 19.6m C) 29.4m D) 4.9m
12.

At which angle the range of the projectile is maximum?

A)

B)

C)

13.

In the following velocity- time graph calculate the distance covered by the object in 30 seconds?

A)

300m

B)

500m

 C)

200m

D)

400m
14.

An object moves along a straight line with an acceleration of . If its initial speed is 10 m/s, find its speed after 5s?

15.

Fill in the blanks: SI unit of accleration is ________.

A)

m/s

 B)

m/s2

 C)

16.

 When s-t graph is parallel to x-axis, the body is

A)

At rest

 B)

At constant speed

 C)

moving slowly

 D)

moving very fast
17.

Which one of the following graphs represent non uniform velocity of an object?

A)

B)

C)

D)

None of these
18.
Fill in the blanks: In the analysis of projectile motion, it is assumed that effect of air resistance is _________.
A) important B) negligible C) considerable D) none of these
19.

DC motor can be used used to display sqaure shape.  

A) True B) False
20.
Fill in the blanks: The path followed by a projectile is called its __________.
A) territory B) trajectory C) orbit D) none of these

CBSE Class 9 Science Worksheet

Unit 3-Motion, Force and Work - Motion

Answers

1.
Option C

Solution:

Assume the distance of one side journey equal to the LCM of both speeds given here. Then use the formula of average speed which is:

Average Speed = total distance traveled /total time taken


2.
zero
3.
Option D
4.
Option A

5.
Distance travelled is ?R and displacement is 2R.
6.
Option B
7.
Option A

8.
Vector
9.

175 m

10.
Distance travelled
11.
Option B
12.
Option D
13.
Option D

14.

15m/s

15.
Option B
16.
Option B
17.
Option A
18.
Option B
19.
Option A
20.
Option B
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