motion quizz.pdf

Worksheet MOTION QUIZZ Class 09 - Science Time Allowed: 30 minutes Maximum Marks: 30 1. Suppose a boy is e...

Worksheet MOTION QUIZZ Class 09 - Science Time Allowed: 30 minutes Maximum Marks: 30 1. Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10ms-1. It implies that the boy is a) moving with no acceleration b) at rest c) in accelerated motion d) moving with uniform velocity 2. Slope of a velocity-time graph gives a) the displacement b) the acceleration c) the distance d) the speed 3. A body starting at a point, say A, reaches, say B, ahead in a straight line and returns back to A. Then there is: a) negative displacement b) cannot be said c) zero displacement d) positive displacement 4. A particle is moving in a circular path of radius r. The displacement after half a circle would be a) 2r b) 2πr c) πr d) zero 5. What does the slope of the velocity-time graph give? a) acceleration b) force c) displacement d) distance 6. What does the area of the velocity-time graph give? a) Displacement b) Speed c) Acceleration d) Average speed 7. The area under the velocity-time graph gives the value of: a) velocity b) acceleration c) mass d) distance travelled 8. Which of the following figures represent uniform motion of moving object correctly? a) b) 1/3  c) d) 9. What is the slope of the body when it moves with uniform velocity? a) positive b) zero c) may be positive or negative d) negative 10. A person sitting in the truck projected a ball vertically upwards. The ball: a) falls outside the truck b) falls by the side of truck c) falls back in his hand d) falls in front of the truck 11. Which of the following is the characteristic of distance travelled by an object? a) It has only magnitude and no specific b) It has a magnitude as well as specific direction direction c) It can be zero d) The distance travelled by an object is less than the magnitude of the displacement of the object. 12. In which of the following cases of motion, the distance moved and the magnitude of displacement are equal? a) The earth is revolving around the Sun b) The pendulum is moving to and fro c) A car is moving on a straight road d) A car is moving in a circular path 13. The area below v-t graph is a measure of: a) Angular speed b) Displacement c) Angular acceleration d) Acceleration 14. Which of the following gives both direction and magnitude? a) Unit Scalar b) Scalar c) Unit Vector d) Vector 15. A body is said to be in rest when: a) Its position doesn’t change with time with b) It's position changes with time w.r.t respect to the observer. observer. c) The body moves in uniform motion, w.r.t d) None of these. observer. 16. If the velocity of a body is reducing, it is said to have a) Retardation b) Both Negative acceleration and Retardation c) Negative acceleration d) Positive acceleration 17. If a moving body comes to rest, then it's acceleration is: a) Negative b) Positive 2/3  c) Constant d) Zero 18. The displacement of the body can be- a) Zero b) All of these c) Positive d) negative 19. Area under a v - t graph represents a physical quantity which has the unit a) ms-1 b) m2 c) m d) m3 20. Which of the following is the position-time graph for a body at rest? a) b) c) d) 21. Fill in the blanks: (a) The slope of the velocity-time graph represents the ________ of the body. (b) The ________ of an object in motion is the shortest distance between the initial position and the final position of the object. (c) Distance is a ________ quantity. (d) To locate the position of an object, we have to choose some suitable reference point called the ________. (e) Negative acceleration is called ________. (f) ________ of a body is defined as the rate of change of its velocity with time. (g) Acceleration is a ________ quantity. (h) When an object moves in a circular path with uniform speed, its motion is called uniform ________ motion. (i) An object is said to have ________ motion if it travels unequal distances in equal intervals of time. (j) The acceleration is taken to be ________ if it is in the direction of velocity. 3/3