ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 A body is thrown from a height h with speed u, it hits the ground with speed V The value of V is maximum if the body is thrown vertically downward The value of V is maximum if the body is thrown vertically upwards The value of V is minimum if the body is thrown horizontally The value of V does not depend on the direction of which it is thrown
2 A ball is dropped vertically down and it takes time t to reach the ground. At time t/2 The ball had covered exactly half the distance The velocity of the ball was V/3 where V is the velocity when it reached the ground The ball had covered less than half the distance The ball had covered more than half the distance
3 A ball is dropped from a certain height and another ball is projected horizontally from the same point. Which of the following statement is correct? Both hit the ground at the same veloctiy Both hit the ground at the same speed The change of velocity during the path for both balls is the same The change of speed during the path for both balls is the same
4 A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear To fall vertically down To fall at an angle going from west to east To fall at an angle going from east to west The information given is insufficient to decide the direction of rain
5 Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 50<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 40<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
6 If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s2) 9.8 m/s 19.6 m/s 39.2 m/s 98.0 m/s
7 If speed of electron is 5 x 105m/s. How long does it take one electron to transverse 1 m? 1 x 10<sup>6</sup> 2 x 10<sup>6</sup> 2 x 10<sup>5</sup> 1 x 10<sup>5</sup>
8 Distance traveled by a body falling from rest in the first, second and third second is in the ration of 1 : 2 : 3 1 : 3 : 5 1 : 4 : 9 None of the above
9 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
10 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>
11 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
12 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
13 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
14 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
15 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
16 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
17 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
18 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
19 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
20 Essential characteristic of equilibrium is Momentum equal to zero Acceleration equal to zero Kinetic energy equal to zero Velocity equal to zero
21 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
22 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>
23 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
24 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
25 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
26 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
27 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
28 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
29 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
30 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
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