MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 760 Mcqs, each offering curated multiple-choice questions to sharpen your Grade9 knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The friction is reduced by |
| A. | making sliding surfaces smooth |
| B. | lubricating the surface |
| C. | using ball bearings |
| D. | all of above |
| Answer» E. | |
| 102. |
The centripetal force is given by |
| A. | (mV2) ⁄ r |
| B. | r ⁄ mv |
| C. | mvr |
| D. | Vr |
| Answer» B. r ⁄ mv | |
| 103. |
The momentum of an isolated system of two or more than two interacting bodies remains |
| A. | variable |
| B. | zero |
| C. | negative |
| D. | constant |
| Answer» E. | |
| 104. |
The direction of centripetal force is always |
| A. | towards center |
| B. | away from center |
| C. | tangent to the circle |
| D. | normal to the circle |
| Answer» B. away from center | |
| 105. |
Alex is walking at the rate of 2km/h towards east, it is an example of |
| A. | vector |
| B. | scalar |
| C. | length |
| D. | energy |
| Answer» B. scalar | |
| 106. |
Straight line motion of a body is known as |
| A. | circular motion |
| B. | linear motion |
| C. | random motion |
| D. | vibratory motion |
| Answer» C. random motion | |
| 107. |
The value of gravitational acceleration is approximately |
| A. | 15 ms−2 |
| B. | 25 ms−2 |
| C. | 10 ms−2 |
| D. | 5 ms−2 |
| Answer» D. 5 ms−2 | |
| 108. |
The third equation of motion can be represented as |
| A. | Vf = Vi + at |
| B. | 2aS = V2f - V2i |
| C. | 2aS = Vf - Vi |
| D. | none of above |
| Answer» C. 2aS = Vf - Vi | |
| 109. |
Gravitational acceleration is denoted by |
| A. | a |
| B. | g |
| C. | r |
| D. | G |
| Answer» C. r | |
| 110. |
A wire is stretched by 2 equal and opposite forces 15 N each. The tension in the string will be |
| A. | 30 N |
| B. | 20 N |
| C. | 15 N |
| D. | 25 N |
| Answer» B. 20 N | |
| 111. |
The opposing force in motion is called |
| A. | inertia |
| B. | resistance |
| C. | friction |
| D. | acceleration |
| Answer» D. acceleration | |
| 112. |
The maximum value of friction is |
| A. | limiting friction |
| B. | unlimited friction |
| C. | infinity |
| D. | none of above |
| Answer» B. unlimited friction | |
| 113. |
If two masses 5.2 kg and 4.8 kg are attached to the ends of inextensible strings passed over a frictionless pulley then the acceleration of the system is |
| A. | 0.7 ms-2 |
| B. | 0.4 ms-2 |
| C. | 0.5 ms-2 |
| D. | 1 ms-1 |
| Answer» C. 0.5 ms-2 | |
| 114. |
SI unit of momentum is |
| A. | newton second (Ns) |
| B. | θ |
| C. | μ |
| D. | λ |
| Answer» B. θ | |
| 115. |
The energy present in a body due to its height is called |
| A. | gravitational kinetic energy |
| B. | gravitational potential energy |
| C. | altitude energy |
| D. | gravitational energy |
| Answer» C. altitude energy | |
| 116. |
Dams are used for generation of |
| A. | mechanical energy |
| B. | nuclear energy |
| C. | electrical energy |
| D. | heat energy |
| Answer» D. heat energy | |
| 117. |
The energy coming directly from magma is called |
| A. | mechanical energy |
| B. | geothermal energy |
| C. | heat energy |
| D. | electrical energy |
| Answer» C. heat energy | |
| 118. |
In Einstein's mass-energy equation, c is the |
| A. | speed of sound |
| B. | speed of light |
| C. | speed of electron |
| D. | speed of Earth |
| Answer» C. speed of electron | |
| 119. |
As the rain falls, the potential energy changes to |
| A. | thermal energy |
| B. | chemical energy |
| C. | kinetic energy |
| D. | nuclear energy |
| Answer» D. nuclear energy | |
| 120. |
The acceleration produced in an 8 kg mass when a force acts on a body of 5 kg produces an acceleration of 10 ms-2 is |
| A. | 6.25 ms-2 |
| B. | 6.25 ms-1 |
| C. | 5 ms-2 |
| D. | 4 ms-2 |
| Answer» B. 6.25 ms-1 | |
| 121. |
A bullet of mass 30 g is fired from a gun with a muzzle velocity 90ms−1. If its mass is 4 kg then the recoil of the gun will be |
| A. | − 0.34 ms−1 |
| B. | 0.54 ms−1 |
| C. | − 0.54 ms−1 |
| D. | 0.34 ms−1 |
| Answer» D. 0.34 ms−1 | |
| 122. |
A body of mass 10 kg is moving with the velocity of 15 ms−1. The force required to stop it in 3 seconds should be |
| A. | 50 Ns |
| B. | 100 Ns |
| C. | 75 Ns |
| D. | 170 Ns |
| Answer» D. 170 Ns | |
| 123. |
When a net force act on a body, it produces acceleration in the body in the direction of the net force which is directly proportional to the net force acting on the body and inversely proportional to its mass. This statement is called |
| A. | newton's 2nd law of motion |
| B. | newton's 1st law of motion |
| C. | newton's 3rd law of motion |
| D. | law of momentum |
| Answer» B. newton's 1st law of motion | |
| 124. |
The acceleration that is produced by a 15N force in a mass of 8 kg will be equal to |
| A. | 1.5 ms−2 |
| B. | 1.87 ms−2 |
| C. | 2.35 ms−2 |
| D. | 2 ms−2 |
| Answer» C. 2.35 ms−2 | |
| 125. |
The force acting normally per unit area on the surface of the body is known as |
| A. | pressure |
| B. | power |
| C. | stress |
| D. | strain |
| Answer» B. power | |
| 126. |
As the depth of the sensor varies the liquid pressure |
| A. | does not change |
| B. | varies accordingly |
| C. | increases |
| D. | decreases |
| Answer» C. increases | |
| 127. |
At sea level, the vertical height of the water column would be |
| A. | 13.45 m |
| B. | 10.34 m |
| C. | 11.25 m |
| D. | 12.36 m |
| Answer» D. 12.36 m | |
| 128. |
Increasing atmospheric pressure with a decline, later on, predicts an |
| A. | long spell of pleasant weather |
| B. | intense weather condition |
| C. | no change in weather |
| D. | small spell of pleasant weather |
| Answer» C. no change in weather | |
| 129. |
The distance between the molecules of the liquid are |
| A. | more than solids |
| B. | less than solids |
| C. | equal to solids |
| D. | more than gases |
| Answer» B. less than solids | |
| 130. |
How much centripetal force is needed to make a body of mass 0.8 kg to move in a circle of radius 40 cm with a speed 2 ms−1? |
| A. | 5 N |
| B. | 6 N |
| C. | 7 N |
| D. | 8 N |
| Answer» E. | |
| 131. |
The force of friction between a rolling body and a surface over which it rolls is called |
| A. | sliding friction |
| B. | rolling friction |
| C. | limiting friction |
| D. | vertical friction |
| Answer» C. limiting friction | |
| 132. |
The property of a body due to which it resists any change in its state of rest or motion is termed as |
| A. | force |
| B. | inertia |
| C. | momentum |
| D. | velocity |
| Answer» C. momentum | |
| 133. |
Cream separator acts on the same principle of |
| A. | centrifuge machine |
| B. | pendulum |
| C. | floatation |
| D. | screw gauge |
| Answer» B. pendulum | |
| 134. |
Mass of a body (m) into acceleration (a) is equal to |
| A. | inertia |
| B. | displacement |
| C. | momentum |
| D. | force |
| Answer» E. | |
| 135. |
Mass does not change with the change of place so it is a |
| A. | vector quantity |
| B. | scalar quantity |
| C. | fixed quantity |
| D. | variable quantity |
| Answer» C. fixed quantity | |
| 136. |
The property due to which a body resists the change in its state is called |
| A. | inertia |
| B. | friction |
| C. | force |
| D. | velocity |
| Answer» B. friction | |
| 137. |
The branch of mechanics that deals with the study of the motion of an object and the cause of its motion are called |
| A. | kinematics |
| B. | dynamics |
| C. | trinamics |
| D. | friction |
| Answer» B. dynamics | |
| 138. |
Two masses 7.5 kg and 6.7 kg are attached to the ends of an inextensible string passes over a frictionless pulley. Its tension when both masses are moving vertically will be equal to |
| A. | 50 N |
| B. | 70.7 N |
| C. | 65.6 N |
| D. | 45 N |
| Answer» C. 65.6 N | |
| 139. |
If the bullet of mass 20 g is fired from a gun of 5 kg with a velocity of 100 ms-1 then recoil of the gun is |
| A. | 0.4 ms-1 |
| B. | -0.4 ms-1 |
| C. | 1 ms-1 |
| D. | 2 ms-1 |
| Answer» C. 1 ms-1 | |
| 140. |
A brick of mass 100 g is attached to a rope 1m long. The brick is rotating in a circle with 5ms−1 speed. The tension in the rope will be |
| A. | 3 N |
| B. | 2.5 N |
| C. | 4 N |
| D. | 1.5 N |
| Answer» C. 4 N | |
| 141. |
The quantity of motion that the body possesses due to its mass and velocity is known as |
| A. | inertia |
| B. | momentum |
| C. | force |
| D. | friction |
| Answer» C. force | |
| 142. |
A cyclist keeps on pedaling to overcome |
| A. | velocity |
| B. | inertia |
| C. | position |
| D. | friction |
| Answer» E. | |
| 143. |
The force that keeps the objects in a circular path is called |
| A. | centrifugal force |
| B. | frictional force |
| C. | centripetal force |
| D. | inertia |
| Answer» D. inertia | |
| 144. |
The force needed to prevent a body of mass 13 kg from falling will be |
| A. | 130 N |
| B. | 110 N |
| C. | 100 N |
| D. | 120 N |
| Answer» B. 110 N | |
| 145. |
If we make the sliding surfaces smooth by lubricating etc. the friction can be |
| A. | increase |
| B. | dangerous |
| C. | reduce |
| D. | all of above |
| Answer» D. all of above | |
| 146. |
The quantity of motion a body possesses due to its mass and velocity is called |
| A. | acceleration |
| B. | force |
| C. | inertia |
| D. | momentum |
| Answer» E. | |
| 147. |
The resultant of all the forces acting on a body is called |
| A. | net force |
| B. | net friction |
| C. | net velocity |
| D. | net momentum |
| Answer» B. net friction | |
| 148. |
The shape and size of a body on which action takes place can also be changed due to |
| A. | velocity |
| B. | momentum |
| C. | force |
| D. | weight |
| Answer» D. weight | |
| 149. |
The force that keeps a body to move in a circle is known as |
| A. | centrifugal force |
| B. | gravitational force |
| C. | dynamic force |
| D. | centripetal force |
| Answer» E. | |
| 150. |
The momentum of an isolated system always remains |
| A. | constant |
| B. | zero |
| C. | high |
| D. | low |
| Answer» B. zero | |