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Class 9 Science Chapter 8 Motion Quiz 5 (25 MCQs)

Quiz Instructions

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1. The Rate of change of displacement is called .....
2. The tip of seconds hand clock takes 60 s to move once on the circular dial of the clock. If the radius of the dial is 10.5 cm. Calculate the speed. (Take pi=22/7)
3. A car travels on a straight road with a velocity of 25km/ hour in first one hour and in the next one hour it changes its speed to 35km/ hour. What is the average velocity of the car?
4. Automobiles are fitted with a device that show the distance traveled. such a device is known ..... (a) odometer (b) Speedo meter (C) octameter (D) decameter
5. In which of the following cases of motions, the distance moved and the magnitude of displacement are equal?
6. A change in velocity over time is
7. When a body is at rest, its velocity is:
8. Velocity is
9. Which of the following can sometimes be 'zero' for a moving body?i. Average velocityii. Distance travellediii. Average speed iv. Displacement
10. Average velocity can be calculated by:a) (u+v)/2 b) uv/2 c)-(v-u)/2 d)-(u-v)/2
11. Which of the following statement is correct regarding velocity and speed of a moving body?
12. Name the instrument used to measure instantaneous speed of a vehicle
13. ..... is the length of the path between two points.
14. Abdul while driving to school computes the average speed for his trip to be 20 km per hour on his return trip along the same route there is less traffic and average speed is 30 km per hour.What is the average speed for Abdul strip
15. Two cars X and Y are travelling along a straight road. The two cars are said to be in uniform motion when:
16. In circular motion, the radius vector .....
17. 88 m/s
18. An object moves along a curved path. The following quantities may remain constant during its motion.
19. A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is
20. Given:$v_i=10\frac{m}{s}\\\\\ldots\\\\v_f=15\frac{m}{s}\\\\ldots\\\\a=10\\frac{m}{s^2}$
21. A particle is moving in a circular path of radius r. The displacement after half a circle would be:
22. A person travels on a semi-circular track of radius 50 m during a morning walk. If he starts from one end of the track and reaches the other end, calculates the distance traveled and displacement of the person.
23. The average velocity of a body is given by the expression:
24. The distance between your final position and your starting position is displacement.
25. An object is projected upwards with a velocity 0f 100 m/s. It will strike the ground after ( approximately )
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