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 Rocket engines lift a rocket from the earth surface, because hot gas with high velocity Push against the air React against the rocket and push it up Heat up the air which lifts the rocket Push against the earth
2 Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same Momentum Kinetic energy Velocity Total energy
3 When the surfaces are coated with a lubricant, then they Stick to each other Slide upon each other Roll upon each other None of these
4 A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is 0.15 x 10<sup>-3</sup>Ns 0.98 x 10<sup>-3</sup>Ns 1.5 x 10<sup>-3</sup>Ns 2.5 x 10<sup>-3</sup>Ns
5 Unit of impulse in Newton Kg m Kg m/s Joule
6 A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards? 0.1 m/s 10 m/s 1 m/s 0.01 m/s
7 A cold soft drink is kept on the balance. When the cap is opened, then the weight Increases Decreases First increases, then decreases Remains same
8 When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts In the backward direction on the front wheel and in the forward direction on the rear wheel In the forwards directions on the front wheel and in the backward direction on the rear wheel In the forward direction on both the wheels In the backward direction on both the wheels
9 An aircraft is moving with a velocity of 300 ms-1. If all the forces acting on it are balanced, then It still moves with the same velocity It will be just floating at the same point in space It will be fall down instantaneously It will lose its velocity gradually
10 A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat? 4 m/s 2 m/s 8 m/s 1 m/s
11 For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to Four times Thrice Once Twice
12 Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first? The faster one Depends on their mass The slower one Both will reach simultaneously
13 A the top of the trajectory of a projectile, the directions of its velocity and acceleration are Perpendicular to each other Parallel to each other Inclined to each other at an angle of 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> Anitparallel to each other
14 Angular momentum Scalar Axial vector Polar vector At 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° angle</span>
15 A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/ss) 9.8 m 14.7 m 4.9 m 19.6 m
16 The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°? 400 m 300 m 200 m 100 m
17 A projectile on its path gets divided into two pieces at its highest point. Which is true? Momentum increases Momentum decreases Kinetic energy increases Kinetic energy decreases
18 Which of the following statements for an object in equilibrium is not true? The object must be at rest The object can be at rest The object is moving at constant speed The acceleration of the object is zero
19 Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true? Their range will be same Their maximum height will be same Their landing velocity will be same Their time of flight will be same
20 Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is 22 m 6 m 33 m 7.8 m
21 Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s2 0.064 m 640 cm 64 cm 64 m
22 A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is 17 m/s 33 m/s 17.5 m/s none
23 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
24 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
25 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
26 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
27 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>
28 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
29 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>
30 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
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