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	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/s^s)	9.8 m 14.7 m 4.9 m 19.6 m

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