# Education In Pakistan

## Physics Mcqs Notes

Physics Mcqs Notes

Laws of motion are valid in a frame of reference which is
a) Inertial b) Non-inertial
c) At rest d) None of the above
A
103. Laws of motion not valid in a system which is
a) At rest b) Inertial
c) Non-inertial d) Moving with uniform velocity
C
104. The laws of motion give the relation between
a) Mass and velocity b) Force and acceleration
c) Velocity and acceleration d) Mass and weight
B
105. If the slope of the velocity-time graph increases at constant rate, with time, then the body is said
to have
a) Uniform retardation b) Uniform negative acceleration
c) Average acceleration d) Uniform positive acceleration
D
106. Newton’s second law of motion is also called
a) Law of inertia b) Law of acceleration
c) Law of gravitation d) Law of thermodynamics
B
107. The force acting on a body of mass 10 kg falling under gravity is
a) 98 N b) 9.8 N
c) 0 N d) 49 N
A
108. A body of mass 5 kg starts from rest and falls freely. The distance covered by it in one second is
a) 9.8 m b) 980 m
c) 49 m d) 4.9 m
D
109. A body is moving in a circle at a constant speed. Which of the following statements is true?
a) There is no acceleration b) There is no force acting on it
c) There is a force acting at a tangent to the circle
d) There is a force acting towards the centre of the circle
D
110. When a force is applied to a body, several effects are possible. Which of the following effects
could not occur?
a) The body rotates b) The body speeds up
c) The mass of the body decreases d) The body changes direction
C
111. What must be changing when a body is accelerating uniformly?
a) The force acting on the body b) The velocity of the body
c) The mass of the body d) The speed of the body
B
112. A stone is dropped from a cliff. The time during which it covers a distance of 490 m is
a) 10 sec b) 100 sec
c) 9.8 sec d) 4.9 sec
A
113. The braking force needed to bring a car of mass 1200 kg to rest in 5 seconds when it is moving at
20 m/s is
a) 6000 N b) 4800 N
c) 2400 N d) 1200 N
B
114. In equation F = ma, the mass m is
a) Rest mass b) Variable mass
c) Inertial mass d) Gravitational mass
C
115. The quantitative measure of inertia of a body is
a) Its mass b) Its weight
c) Its velocity d) Force
A
116. When a horse pulls a cart, the force that causes the horse to move forward is the force
a) The cart exerts on horse b) The horse exerts on cart
c) The horse exerts on the ground d) The ground exerts on horse
D
117. When a person jups off the ground, the reaction force of the ground is
a) Greater than the weight of the person b) Smaller than the weight of the
person
c) Equal to the weight of the person d) Zero
A
118. The property of body that opposes any change in its state of motion or rest is
a) Weight b) Torque
D
c) Momentum d) Inertia
119. Motion of rocket in space is the example of
a) First law of motion b) Second law of motion
c) Third law of motion d) Law of gravitation
C
120. Rate of change of momentum is
a) Weight b) Force
c) Mass d) Acceleration
B
121. When a bullet is fired by a gun, the gun recoils backward with a velocity
a) Less than that of the bullet b) Equal to that of the bullet
c) Greater than that of the bullet d) None of the above
A
122. In elastic collision between two bodies
a) Energy is conserved but momentum is not
b) Both momentum and energy are conserved
c) Momentum is conserved but energy is not
d) Both momentum and energy are not conserved
B
123. Newton’s third law of motion states that
a) When two bodies interact, action and reaction are equal and opposite
b) Acton and reaction produce the same acceleration in two bodies
c) Inertia and mass are the same d) Inertia and force are the same
A
124. Inertia of a body is measured in terms of
a) Its velocity b) Its mass
c) Its weight d) The applied force
B
125. The attraction of earth on a body is called
a) Mass b) Inertial
c) Acceleration d) Weight
D
126. A ball is hit so that it moves straight up in the air and reaches the maximum height in 2 seconds.
Its initial velocity is
a) 19.6 m/s b) 39.2 m/s
c) 9.8 m/s d) 4.9 m/s
A
127. Which of the following is true
a) F = m/a b) a = m/F
c) m = a/F d) a = F/m
D
128. Earth is taken to be a
a) Non-inertial frame b) Inertial frame
c) Reference axes d) None of the above
B
129. Which law is applicable in the motion of the rocket in space
a) Conservation of mass b) Conservation of energy
c) Conservation of angular momentum d) Conservation of linear momentum
D
130. In the absence of any force acting on a body
a) Its momentum changes with distance b) Its momentum is conserved
c) Its momentum is not conserved d) Its momentum changes with time
B
131. A force which always opposes the motion of a body called
a) Static force b) Gravitational force
c) Frictional force d) Impulsive force
C
132. Stoke’s law is applicable to
a) Motion through horizontal surface b) Motion through free space
c) Motion through viscous medium d) Motion through non-resistive medium
C
133. A fog droplet falls vertically with an acceleration while touching ground
a) Equal to g b) Less than g
c) Greater than g d) Equal to zero
B
134. The terminal velocity of a body falling vertically through a fluid
a) Increases with increase in mass b) Decreases with increase in mass
c) Remains same with increase in mass d) None of the above
A
135. The terminal velocity in case of spherical droplet is
a) Inversely proportional to the radius of the droplet
b) Directly proportional to the radius of the droplet
c) Inversely proportional to the square of the radius of the droplet
d) Inversely proportional to the cube of the radius of the droplet
A
136. Neglecting friction, the motion of a body on an inclined plane is independent of the
a) Area of the body b) Volume of the body
c) Density of the body d) Mass of the body
D
137. The acceleration of a spherical ball on a smooth inclined plane is maximum when the angle of
inclination to the horizontal is
a) 90o b) 60o
c) 30o d) 0o
A
138. A constant mass undergoes finite uniform acceleration when the resultant force acting on it
a) Is proportional to the velocity b) Is zero
c) Is constant but not zero d) Increases uniformly with respect to time
C
139. Newton’s third law concerns the forces of interaction between two bodies. Which of the
following statements relating to the third law is not correct?
a) The two forces must act on two different bodies
b) The two forces are always opposite in direction
c) The two forces are at all times equal is magnitude
d) The two forces are equal and opposite so the bodies are in equilibrium
D
140. When a force of 4N acts on a mass of 2 kg for a time of 2s, what is the rate of change of
momentum?
a) 1 kg m s-2 b) 2 kg m s-2
c) 4 kg m s-2 d) 8 kg m s-2
D
141. A force of 20 N acts on a body of mass 100 g. The acceleration produced in the body is
a) 20 m s-2 b) 2 m s-2
c) 2000 m s-2 d) 200 m s-2
B
142. A stone dropped from the top of a building which reaches the ground in 4 seconds. The height of
the building is
a) 4 m b) 78.4 m
c) 19.6 m d) 39.2 m
B
143. A car reaches a velocity of 300 km hr-1 after covering distance of 0.5 km. The acceleration of the
car is
a) 6.9 ms-2 b) 90 ms-2
c) 9.6 ms-2 d) 3 ms-2
A
144. A force actin gon 5 kg mass causes an acceleration of 0.2 ms-2 in it. The magnitude of applied
force is
a) 10 N b) 2.5 N
c) 1 N d) 0.04 N
C
145. An acceleration of 0.4 ms-2 is produced in a body when a force of 8N acts on it. The mass of the
body is
a) 3.2 kg b) 20 kg
c) 0.05 kg d) 50 kg
B
146. A car suffers head on collision with another car with 100 N force of impact for a short time of 2
milliseconds. The impulse is given by
a) 0.2 NS b) 50 NS
c) 200 NS d) 0.02 NS
A
147. A 60 kg car is moving at a speed of 54 km hr-1. Its linear momentum is
a) 3240 Kg ms-1 b) 900 Kg ms-1
c) 11664 Kg ms-1 d) 18.5 Kg ms-1
B
148. A heavy body moving with 10 ms-1 collides elastically with very light body at rest. After
collision, the light body moves at a velocity of
a) Zero ms-1 b) 10 ms-1
c) 20 ms-1 d) 5 ms-1
C
149. A light particle moving with 20 ms-1 collides elastically with heavy body at rest. After collision,
the velocity of the heavy body is
a) Zero b) 20 ms-1
c) 10 ms-1 d) 40 ms-1
A
150. Acceleration in a body is always produced in the direction of
a) Torque b) Force
c) Moment d) Velocity
B
151. Acceleration is defined as
a) Rate of change of velocity b) Rate of change of speed
c) Rate of change of displacement d) Rate of change of distance
A
152. Vf = _______ + at
a) 2as b) Vit
c) s d) Vi
D
153. The quantity of matter in a body is called
a) Mass b) Force
c) Velocity d) Momentum
A
154. Inertial mass and gravitational mass are
a) Weight b) Proportional
c) Identical d) Opposite
C
155. The motion of a body along a straight line
a) Vibratory motion b) Circular motion
c) Uniform motion d) Rectilinear motion
D
156. The slope of the velocity-time graph represents
a) Torque b) Velocity
c) Speed d) Acceleration
D
157. Bodies which fall freely under gravity provide good example of motion under
a) Variable acceleration b) Uniform acceleration
c) Uniform velocity d) None of these
B
158. The change in velocity per unit time is called
a) Torque b) Velocity
c) Acceleration d) Displacement
C
159. If a body is moving uniformly in a straight line the force on the body is
a) Maximum b) Minimum
c) Zero d) Average
C
160. Rate of change of momentum is proportional to the impressed force and takes place
a) Opposite to the direction in which the force acts
b) In the direction in which the force acts
c) Perpendicular to the direction in which the force acts
d) In the direction at an angle of 45o to the direction of force
B
161. A train is running at 25 kilometers per hour, find the time taken by it to travel 15 kilometers.
a) 20 minutes b) 25 minutes
c) 28 minutes d) 36 minutes
D
162. A body falling freely under the action of gravity has
a) No weight b) Minimum weight
c) Maximum weight d) No effects on its weight
A
163. The law of inertia was first time formulated by
a) Plank b) Kepler
c) Newton d) Galileo
D
164. Inertia of body is measured in term of
a) Its weight b) Its mass
c) Its velocity d) Its reaction
B
165. Newton’s second law of motion is also called
a) Law of inertia b) Law of gravitation
c) Law of acceleration d) Law of inertial frame
C
166. Newton’s third law states that
a) Inertia and mass are the same
b) Action and reaction on the same body
c) Inertia and the force are the same
d) To every action there is always an equal and opposite reaction
D
167. The quantity of motion present in a body is called
a) Acceleration b) Moment
c) Momentum d) Velocity
C
168. Inertia mass and gravitational mass are
a) Proportional b) Identical
c) Weights d) Identical when there is no friction
B
169. Momentum = mass ´ _______
a) Force b) Density
c) Acceleration d) Velocity
D
170. In case of book lying on a table.
a) Action of book on table and reaction of table on book are equal and opposite and are inclined to
vertical.
b) Action and reaction are equal and opposite and act perpendicular to the surfaces of contact.
c) Action and reaction are equal but act in the same direction.
d) Action and reaction are not equal but are in opposite direction.
B
171. Swimming is possible on account of
a) First law of motion b) Second law of motion
c) Third law of motion d) Newton’s law of gravitation
C
172. When we jump out of a boat standing in water it moves
a) Forward b) Backward
c) Side ways d) None of the above
B
173. When a train stops suddenly passengers in the running train feel an instant jerk in the forward
direction because
a) The back of seat suddenly pushes the passengers forward
b) Inertia of rest stops the train and takes the body forward
c) Upper part of the body continues to be in the state of motion whereas the lower part of the body
in contact with seat remains at rest
d) Nothing can be said due to insufficient data
C
174. A car is moving with a uniform velocity on a rough horizontal road. Therefore, according to
Newton’s law of motion
a) No force is being applied by its engine
b) A force is surely being applied by its engine
c) An acceleration is being produced in the car
d) The kinetic energy of the car is increasing
B
175. We can derive Newton’s
a) Second and third laws from the first law
b) First and second laws from the third law
A
c) Third and first laws from the second law
d) All the three laws are independent of each other
176. A jet plane lies in the air because
a) The gravity does not act on bodies moving with high speeds
b) The thrust of the jet compensates for the force of gravity
c) The flow of air around the wings causes an upward force, which compensates for the force of
gravity
d) The weight of air whose volume is equal to the volume of the plane is more than the weight of the
plane
B
177. A man is at rest in the middle of a pond on perfectly smooth ice. He can get himself to the shore
by making use of Newton’s
a) First law b) Second law
c) Third law d) All the laws
B
178. Inertia is that property of a body by virtue of which the body is
a) Unable to change by itself the state of rest
b) Unable to change by itself the state of uniform motion
c) Unable to change by itself the direction of motion
d) Unable to change by itself the state of rest and of uniform linear motion
D
179. A cannon after firing recoils due to
a) Conservation of energy b) Backward thrust of gases produced
c) Newton’s third law of motion d) Newton’s first law of motion
C
180. Newton’s second law gives the measure of
a) Acceleration b) Force
c) Momentum d) Angular momentum
B
181. A man getting down a running bus falls forward because
a) Due to inertia of rest, road is left behind and man reaches forward
b) Due to inertia of motion upper part of body continues to be in motion in forward direction while
feet come to rest as soon as they touch the road.
c) He leans forward as a matter of habit
d) Of the combined effect of all the three factors stated in a), b) and c)
B
182. When swims across a flowing river, maximum energy is spent in
a) First 1/3 of the distance b) Second 1/3 of the distance
c) Last 1/3 of the distance d) Equal energy is spent throughout
A
183. The maximum static friction is
a) Equal to the dynamic friction b) Always less than the dynamic friction
c) Always greater than the dynamic friction d) Sometimes greater and sometimes equal to
dynamic friction
C
184. If the normal force is doubled, the coefficient of friction is
a) Not changed b) Halved
c) Doubled d) Tripled
A
185. The maximum static frictional force is
a) Equal to twice the area of the surface in contact
b) Independent of the area of surface in contact
c) Equal to the area of surface in contact d) None of the above
B
186. Which of the following statements is not true
a) The coefficient of friction between two surfaces will increase if the surface are made rough
b) When a body slides on a surface the force of friction acts opposite to the direction of applied force
c) Rolling friction is more than sliding friction
d) The coefficient of friction between wood and wood is less than 1
C
187. Maximum value of static friction is called
a) Limiting friction b) Rolling friction
c) Normal friction d) Coefficient of friction
A
188. The limiting friction between two bodies in contact is independent of
a) Nature of the surfaces in contact b) The area of surfaces in contact
c) Normal reaction between the surfaces d) The materials of the bodies
B
189. The constant ratio which the limiting friction bears with the normal reaction is called
a) Angle of friction b) Cone of friction
c) Coefficient of friction d) None of the above
C
190. Friction can be reduced by
a) Providing lubricants b) Ball bearings
c) Roller bearings d) Any of the above
A
191. The frictional force which comes into play after the motion has commenced is called
a) Static friction b) Dynamic friction
c) Limiting friction d) None of the above
C
192. The resistance offered to the movement on one body upon another is known as
a) Surface tension b) Frictional resistance
c) Limiting friction d) Rolling friction
B
193. The coefficient of fraction depends upon A
a) Nature of surface b) Area of contact
c) Shape of the surface d) All of the above
194. Maximum static friction is always
a) Less than the dynamic friction b) Equal to dynamic friction
c) Greater than the dynamic friction d) Has no relation with dynamic friction
C
195. If two bodies collide each other without the application of the external forces, the total
momentum will:
a) Continuously change b) Remain constant
c) Increase d) Decrease
B
196. Limiting friction bears a constant ration to the normal reaction. This ratio depends upon
a) Nature of the material b) Shape of the surfaces
c) Area of the surfaces d) Normal reaction
A
197. The external unbalance force required to accelerate a body is proportional to the product of the
mass of the body and the acceleration produced is called
a) First law of motion b) Law of inertia
c) Second law of motion d) Third law of motion
C
198. The characteristic of weight is
a) A vector quantity b) Not fixed property
c) Depend upon the location as well as the motion of framework
d) All of the above
D
199. If the velocity of a body does not increase by equal amounts in equal intervals of time it is said to
have
a) Uniform acceleration b) Variable acceleration
c) Average acceleration d) Instantaneous acceleration
B
200. The substances used as moderators always consist of
a) Lighter atoms b) Heavier atoms
c) Atoms of comparable masses d) None of the above
C

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