SETH ANANDRAM JAIPURIA SCHOOL VASUNDHARA,GHAZIABAD SESSION 2017-18 OLYMPIAD WORKSHEET Class: IX SUBJECT: PHYSICS TOPIC: MOTION 1. The speed of a body is 1 m s -1. The angle between the distance time graph of the body and the time axis is (a) 0 (b) 30 (c) 45 (d) 60 2. A Body falling from rest describes distances S 1, S 2 and S 3 is the first,second and third seconds of its fall.then the ratio of S 1 :S 2 :S 3 is : (a) 1:1:1 (b) 1:3:5 (c) 1:2:3 (d) 1:4:9 3. A body starts from rest at time t=0, the acceleration time graph is shown in figure.the maximum velocity attained by the body will be: (a) 110m/s (b) 55m/s (c) 650m/s (d) 550m/s 4. A person takes time t to go once around a circular path of diameter 2r. The speed (v) of this person would be (a) t/2πr (b) 2πr/t (c) πr 2 /t (d) 2πr.t 5. A man walks along the footpath of a circular garden.during his motion along the circular path he makes several rounds.his net displacement will be zero whenever his distance travelled will be in multiples of :
(a) its radius (b) its diameter (c) circumference of circular path (d) area of circle 6. The under given position-time graph describes which of the given options : (a) from t =0 sec to t=5 sec the object accelerated and then it decelerates. (b) from t=0 sec to t=5 sec the object decelerates and then it accelerates. (c) from t=0 sec to t=5 sec it travels with uniform velocity and then travels with non-uniform velocity. (d) from t= 0 sec to t=5 sec it travel with non uniform velocity and then travels with uniform velocity. 7. Which of the following situation is not possible: (a) An object moving in certain direction with an acceleration in perpendicular direction. (b) An object moving with constant acceleration but zero velocity. (c) An object moving with variable speed and uniform velocity. (d) None of the above. 8. A ball thrown vertically upward returns to the thrower after 6s.The ball is 5m below the highest point at t= 2s.The time at which the body will be at same position,(take acceleration a=g= 10m/s 2 ) (a) 2.5s (b) 3s (c) 4s (d) 5s
9. A particale starts its motion from rest under the action of a constant force.if the distance covered in first 10s is S 1 and that covered in first 20s is S 2 then (a) S 2 = S 1 (b) S 2 = 2S 1 (c) S 2 = 3S 1 (d) S 2 = 4S 1 10. A train starts from a station and accelerates during first 10 minutes. A boy sitting in the train throws up a ball during this interval. The ball wil (a) come back to the boy s hands (c) fall behind the boy (b) fall in front of the boy (d) Any of these 11. State of motion is described by (a) Position of rest (b) Position of motion (c) Both by state of rest and motion (d) None of these 12. The velocity time graph of a car moving on a straight road is shown here. The displacement of the car from third second to sixth second of its journey is (a) 12m (b) 4m (c) 16m (d) 8m 13. For motion on a curved path with constant acceleration (magnitude of displacement/distance covered) (a) > 1 (b) (c) (d) < 14. A car accelerates from rest for time T 1 at constant rate a 1 and then it retards at the constant rate a 2 for time T 2 and come to rest. T 1 /T 2 = (a) a 1/ a 2 (b) a 2 /a 1 (c) a 12 /a 2 2 (d) a 22 /a 1 2
15. A particle moving in a straight line path with constant acceleration directed along the direction of instantaneous velocity.which of the following statements about the motion of the particle is true? (a) particle may reverse the direction of motion (b) distance covered = magnitude of displacement (c) average velocity is less than average speed (d) average velocity = instantaneous velocity 16. A car travels a distance S on a straight road in two hours and then returns to the starting point in the next three hours.its average velocity is (a) S/5 (b) 2S/5 (c) S/2 + S/3 (d) none of the above 17. A person is throwing balls into the air one after the other.he throws the second ball when first ball is at the highest point. If he is throwing two balls every second,how high do they rise? (a) 5m (b) 3.75m (c) 2.50m (d) 1.25m 18. The velocity u of a body moving along a straight line with constant retardation a reduces by 75% in time t.what is the time taken in doing so? (a) u/4a (b) 3u/4a (c) 4u/3a (d) u/3a 19. A car covers 1/3 distance with speed 20km/hr and 2/3 with 60km/h.Average speed is (a) 40km/h (b) 50 2 km/h (c) 36km/h (d) 80km/h 20. Which of the following statements for an object in equilibirium is not true? (a) the object must be at rest (b) the object can be at rest (c) the object is moving at constant speed (d) the acceleration of the object is zero. 21. A train takes 1 hour to go from one station to the other.it travels at a speed of 30km/h for first half hour and at a speed of 50 km/h for the next half hour.the average speed of the train is (a) 35km/h (b) 40km/h (c) 45km/h (d) none of the above 22. The displacement time graph for two bodies A and B are straight lines inclined at 30 0 and 60 0 respectively with the time axes.if v a and v b are their velocities then v a :v b will be :
(a) 3:1 (b) 1: 3 (c) 3:1 (d) 1:3 23. The distance travelled by a particle starting from rest and moving with an acceleration 4/3m/s -2 in third second is (a) 19/3m (b) 6m (c) 4m (d) 10/3m 24. The velocity of a particle at an instant is 10m/s.After 3s its velocity will become 16m/s.The velocity at 2s,before the given instant will be (a) 6m/s (b) 4m/s (c) 2m/s (d) 1m/s 25. Velocity time graph of an object is What will be its Displacement Time Graph-