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Motion CBSE Class 9

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Motion Topics

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Video Based Test funda (Please watch the above videos before attempting this assessment)
Question 1/20

Q 1. In the distance-time graph, distance is plotted on the

Solution

In the distance-time graph, distance is plotted on the Y-axis.

Q 2. When the speed of an object changes in uniform rate, the acceleration is  

Solution

When the speed of an object changes in uniform rate, the acceleration is uniform.

Q 3. The CGS unit of speed is

Solution

The CGS unit of speed is cm/s.

Q 4. A cyclist is cycling around a circular path of radius 20 m continuously. The displacement is

Solution

The displacement of the cyclist is zero as the initial and final positions of the cyclist is the same.

Q 5. If the velocity goes on decreasing, then acceleration will be _________ and is called

Solution

If the velocity goes on decreasing, then acceleration will be negative and is called retardation or deceleration.

Q 6. The second hand rotates from number 12 to number 6 in a clock having a radius of 7 cm. What is the distance travelled by the second hand?

Solution

Distance travelled = Circumference of clock/2 =2 r/2

= 2 x 22/7 x 7/2 = 22 cm

Q 7. If the values of speed and time taken are known, __________ can be calculated.

Solution

If the values of speed and time taken are known, distance travelled can be calculated.

Q 8. If a body moves along a circular path of radius ‘a’ for time ‘t’, then the velocity ‘n’ is given as 

Solution

If a body moves along a circular path of radius ‘a’ for time ‘t’, then the velocity ‘n’ is given as  .

Q 9. High speed values are expressed using

Solution

High speed values are expressed using kilometre per hour.

Q 10. Distance is a _____ quantity.

Solution

Distance is a scalar quantity.

Q 11. If a man travels a distance of 1.5 m towards the east and 3.5 m towards the south, the resultant displacement is

Solution

Displacement =   

= 3.8 m

Q 12. Which of the following is a vector quantity? A. Acceleration B. Speed C. Distance

Solution

Acceleration is a vector quantity.

Q 13. ____________ gives the velocity acquired by a body in time ‘t’.

Solution

First equation of motion gives the velocity acquired by a body in time t.

Q 14. In the speed-time graph, the slope of the graph gives

Solution

In the speed-time graph, the slope of the graph gives acceleration.

Q 15. When an object is moving in a straight line with constant speed, 

Solution

When an object is moving in a straight line with constant speed, it is not an accelerated motion.

Q 16. Which of the following is an independent variable? A. Time B. Distance C. Displacement

Solution

Time is an independent variable which is plotted on the X-axis on the distance-time graph.

Q 17. The following graph indicates that a body is moving with   

Solution

The graph shows that the body is moving with uniform acceleration when it was not initially in motion.

Q 18. Odometer gives the information about the

Solution

Odometer gives the information about the distance travelled by a vehicle.

Q 19. In a distance-time graph, if A is the origin, D is a point on the straight line graph and AO is the time taken by a body to travel a distance of AC, then speed is expressed as

Solution

Speed = distance/time

Thus,

Speed

AD = AC/AO 

Q 20. The following speed-time graph shows that the moving body has   

Solution

The speed-time graph indicates that the body is moving with constant speed and possesses no acceleration.

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Motion Notes

Revision Notes

Read CBSE Class 9 Physics revision notes for Motion

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Motion Tests

Motion Textbook Solutions

Motion Doubts and Solutions

Asked by ay5109892 6th June 2019, 12:38 PM
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