ECAT Pre General Science Physics Chapter 3 Motion and Force Online Test With Answers

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ECAT Pre General Science Physics Chapter 3 Motion and Force Online Test

Sr. # Questions Answers Choice
1 A ball is dropped downwards After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds 25 m 20 m 50 m 9.8 m
2 If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be 20 ms<sup>-2</sup> 10 ms<sup>-2</sup> 2 ms<sup>-2</sup> 1 ms<sup>-2</sup>
3 A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is 37.5 km/h 10 km/h 42 km/h 40 km/h
4 If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be Unequal Exactly equal Roughly equal Zero
5 A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of 3 s 5 s 7 s 9 s
6 A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is Moving forward and gaining speed Moving forward and losing speed Moving forward with uniform speed Moving backward with uniform speed
7 The mass of a body measured by a physical balance in a lift at rest is found to be m, if the lift is going up with an acceleration a, its mass will be measured as m (1 - a/g) m (1 + a/g) m Zero
8 A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is 60 kg wt 72 kg wt 48 kg wt Zero
9 A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when Elevator is stationary Elevator cable breaks and it falls freely towards earth Elevator accelerates downwards Elevator accelerates upward
10 A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be Zero g -g V + g
11 A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is 120 x 10.8 N 180 N 720 N 360 N
12 Essential characteristic of equilibrium is Momentum equal to zero Acceleration equal to zero Kinetic energy equal to zero Velocity equal to zero
13 If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of 20 m 400 m 1440 m 2880 m
14 A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is 2100 m/s<sup>2</sup> 1400 m/s<sup>2</sup> 700 m/s<sup>2</sup> 400 m/s<sup>2</sup>
15 By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second ( g=10m/s2) 58.8 m/s 49 m/s 65 m/s 19.6 m/s
16 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
17 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
18 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
19 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
20 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
21 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
22 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
23 At the top of the trajectory of a projectile the acceleration is The maximum The minimum Zero g
24 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
25 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
26 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
27 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
28 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
29 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
30 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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