1) Rate of change of velocity with respect to time _______________. a) Distance b) Displacement c) Acceleration d) Velocity 2) Rate of change of displacement is called _______________. a) Speed b) Deceleration c) Acceleration d) Velocity 3) Acceleration is a vector quantity, which indicates that its value _______________. a) Is always negative b) Can be positive, negative or zero c) Is zero d) is always positive 4) Distance covered by a body from velocity-time graph is _________________. a) Is denoted by a line parallel to the distance axis at any point on the time axis b) Is denoted by a line parallel to the time axis at any point on the distance axis c) Area under the graph d) Equal to the slope of the graph 5) An example of a body moving with constant speed but still accelerating is ________________. a) A body moving with constant speed on a straight road b) A body moving with constant speed in a circular path c) A body moving with constant speed on a straight railway track d) A body moving in a helical path with constant speed 6) A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is a) 0 km b) 10 km c) 30 km d) 50 km 7) SI Unit of measurement of acceleration is _______________________. a) m/s b) m/hr c) m d) m/s² 8) What does the slope of distance-time graph give? a) Speed b) Acceleration c) Uniform speed d) both [b] and [c] depending upon the time of graph 9) Which of the following is most likely not a case of uniform circular motion? a) Motion of the earth around the sun b) Motion of a toy train on a circular track c) Motion of hours’ hand on the dial of a clock d) Motion of a racing car on a circular track 10) In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal? a) If the car is moving on a straight road b) If the car is moving in circular path c) The pendulum is moving to and fro d) The earth is moving around the sun 11) A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be: a) 10 m/s b) 250 m/s c) 40 m/s d) 25 m/s 12) A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest? a) 8100 m b) 620 m c) 900 m d) 625 m

Motion class 9

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