ECAT Pre Computer Science Chapter 3 online mcq test with answers for Physics chapter 3 (Motion and Force)

ECAT Physics Chapter 3 Motion and Force Online Test

Sr. #	Questions	Answers Choice
1	A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time	6 s 36 s 38 s None of these
2	A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is	m 2 m 4 m Infinity
3	A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?	60 km/hr 80 km/hr 120 km/hr 180 km/hr
4	An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is	1200 m 0.33 km 3.33 km 33 km
5	For a moving body, at any instant of time	If the body is not moving the acceleration is necessarily zero If the body is slowing, the retardation is negative If the body is slowing, the distance is negative If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future
6	A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is	24/13 10/3 3 4,8
7	A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after	10 s 20 s 5 s 40 s
8	At the top of the trajectory of a projectile the acceleration is	The maximum The minimum Zero g
9	Which of the following four statements is false?	A body can have zero velocity and still be accelerated A body can have a constant velocity and still have a varying speed A body can have a constant speed and still have a varying velocity The direction of the velocity of a body can change when its acceleration is constant
10	A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about	80 m 20 m 160 m 40 m
11	What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?	4 : 5 7 : 9 16 : 25 1 : 1
12	A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to	12 s 8 s 15 s 10 s
13	The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are	3, 15 4, 14 5, 13 6, 12
14	A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be	40 km/h 48 km/h 50 km/h 60 km/h
15	In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is	8 4 6 7

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