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 Suppose the water flows out from a pipe at 3kg s-1and its velocity changes from 5m s-1to zero on striking the wall, then the force exerted by water on wall will be 5 N 10 N 15 N 20 N
2 A snooker ball moving with velocity V collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is Zero Infinity V 2 V
3 Which quantity has the same units as impulse force work linear momentum acceleration
4 The product of force and time is called acceleration linear momentum angular momentum impulse
5 The entity which measures the quantity of motion in a body is called force energy momentum power
6 According to the law of conservation of linear momentum, the total linear momentum of an isolated system increases decreases with time remains constant none of them
7 The expression F x t is called impulse if the time 't' is zero very large very small infinite
8 In the expression F x t, the force F is total force instantaneous force average force all of them
9 The quantity F x t is called as momentum velocity acceleration impulse
10 Rate of change of momentum is called Impulse Force Torque Momentum
11 The SI units of momentum is kg m s<sup>-2</sup> kg ms kg m s<sup>2</sup> N-s
12 The direction of the linear momentum is the direction of speed velocity weight none of them
13 Linear momentum is a fixed quantity constant quantity scalar quantity vector quantity
14 The linear momentum of the body is defined as p=ma p=1/2ma p=mv p=1/2mv
15 If the objects of different masses move with the same velocity, then it is more difficult to stop the lighter of the two massive of the two any one of them both of them
16 Earth is considered to be a non-inertial frame an inertial frame an accelerated frame none of the above
17 When a person jumps off the ground, the reaction force of the ground is greater than the weight of the person smaller than the weight of the person equal to the weight of the person zero
18 In equation F=ma, then mass 'm' is rest mass variable mass inertial mass gravitational mass
19 The second law gives the relationship between mass and velocity force and acceleration velocity and acceleration mass and weight
20 Laws of motion are not valid in a system which is inertial non-interial at rest moving with uniform velocity
21 What must be changing when a body is accelerating uniformly? the force acting on a body the velocity of the body the mass of the body the speed of the body
22 When a force is applied on a body, several effects are possible Which of the following effect could not occur? the body rotates the body speeds up the mass of the body decreases the body changes its direction
23 For a fixed force, larger is the mass of a body the greater is its acceleration smaller is its acceleration smaller is its weight zero is its acceleration
24 Inertia mass and gravitational mass are opposite identical identical when there is no friction all of them
25 The effect of applying a force on a moving body is to change its direction of motion only its speed of motion only both the direction and speed of motion its inertia only
26 Inertial frame of references are those frame of references which are moving with increasing velocity decreasing velocity constant velocity all of them
27 The mass of the object is a quantities measure of its speed velocity acceleration inertia
28 A 5 kg mass is falling freely, the force acting on, it will be 19.6 N 9.8 N 5 N Zero
29 The discuss used by athlete has a mass of 1 kg, its weight in newton is 9.8 N 80 N 98 N 100 N
30 A mass of 5kg moves with an acceleration of 10m s-2force applied is 10<b>N</b> 50<b>N</b> 2<b>N</b> 20<b>N</b>
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