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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
The engine of a car produces an acceleration of\[4\,\,m\,\,{{s}^{-2}}\] in a car, if this car pulls another car of same mass, what is the acceleration produced? |
| A. | \[8\,\,m\,\,{{s}^{-2}}\] |
| B. | \[2\,\,m\,\,{{s}^{-2}}\] |
| C. | \[4\,\,m\,\,{{s}^{-2}}\] |
| D. | \[1/2\,\,m\,\,{{s}^{-2}}\] |
| Answer» C. \[4\,\,m\,\,{{s}^{-2}}\] | |
| 1102. |
A block of mass 10 kg resting on a horizontal surface is connected by a cord passing over a light frictionless pulley to a hanging block of mass 10 kg as shown in the figure. The coefficient of friction between the block and the surface is 0.5. The acceleration of the system is \[\left( \text{g }==\text{ 1}0\text{ m}/{{\text{s}}^{\text{2}}} \right)\] |
| A. | \[\text{2}.\text{5 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[0.\text{25 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{5 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[0.\text{5 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» B. \[0.\text{25 m}/{{\text{s}}^{\text{2}}}\] | |
| 1103. |
Internal force |
| A. | Are always balanced |
| B. | Are never balanced |
| C. | May or may not be balanced |
| D. | None of these |
| Answer» D. None of these | |
| 1104. |
A force of \[100\,\,N\] acts on a body of mass \[2\,\,kg\] for\[10\,\,s\]. Find the change in the velocity of the body. |
| A. | \[100\,\,m\,\,{{s}^{-1}}\] |
| B. | \[250\,\,m\,\,{{s}^{-1}}\] |
| C. | \[500\,\,m\,\,{{s}^{-1}}\] |
| D. | \[1000\,\,m\,\,{{s}^{-1}}\] |
| Answer» D. \[1000\,\,m\,\,{{s}^{-1}}\] | |
| 1105. |
Newton's which law which defines force? |
| A. | First law |
| B. | Second law |
| C. | Third law |
| D. | None of these |
| Answer» B. Second law | |
| 1106. |
It is difficult to walk on ice because of |
| A. | Absence of friction |
| B. | absence of inertia |
| C. | More inertia |
| D. | more friction |
| Answer» B. absence of inertia | |
| 1107. |
A bullet of mass \[20\,\,g\] is fired from a rifle of \[8\,\,kg\] with an initial velocity of\[100\,\,m\,\,{{s}^{-1}}\]. Find the final velocity of the recoil of the rifle. |
| A. | \[-0.25\,\,m\,\,{{s}^{-1}}\] |
| B. | \[2.5\,\,m\,\,{{s}^{-1}}\] |
| C. | \[25\,\,m\,\,{{s}^{-1}}\] |
| D. | \[250\,\,m\,\,{{s}^{-1}}\] |
| Answer» B. \[2.5\,\,m\,\,{{s}^{-1}}\] | |
| 1108. |
An insect is crawling up a fixed hemispherical bowl of radius R. If the coefficient of friction is 1/3, then the height upto which insect can crawl is |
| A. | 2 % of R |
| B. | 3 % of R |
| C. | 4 % of R |
| D. | 5 % of R |
| Answer» E. | |
| 1109. |
Two bodies have masses in the ratio of\[3:4\]. When the same force is applied on both the bodies, the first body produces an acceleration of\[6\,\,m\,\,{{s}^{-2}}\]. What is the acceleration produced by the second body? |
| A. | \[-0.25\,\,m\,\,{{s}^{-1}}\] |
| B. | \[2.5\,\,m\,\,{{s}^{-1}}\] |
| C. | \[25\,\,m\,\,{{s}^{-1}}\] |
| D. | \[250\,\,m\,\,{{s}^{-1}}\] |
| Answer» C. \[25\,\,m\,\,{{s}^{-1}}\] | |
| 1110. |
A man weighing \[60\,\,kg\] is walking with a uniform velocity of\[4\,\,m\,\,{{s}^{-1}}\]. Calculate the momentum of a man. |
| A. | \[120\,\,m\,\,{{s}^{-1}}\] |
| B. | \[240\,\,m\,\,{{s}^{-1}}\] |
| C. | \[360\,\,m\,\,{{s}^{-1}}\] |
| D. | \[480\,\,m\,\,{{s}^{-1}}\] |
| Answer» C. \[360\,\,m\,\,{{s}^{-1}}\] | |
| 1111. |
The accelerated motion of a body changes due to change in |
| A. | speed |
| B. | direction of motion. |
| C. | constant velocity. |
| D. | Both [a] and [b] |
| Answer» E. | |
| 1112. |
The total mass of an elevator, with a 80 kg man in it, is 1000 kg. This elevator moving upward with a speed of 8 m/s is brought to rest over a distance 16 m. Then tension T in the cable supporting elevator is |
| A. | 3200 N |
| B. | 5400 N |
| C. | 6500 N |
| D. | 7800 N |
| Answer» E. | |
| 1113. |
A truck and a car are moving with equal velocity. On applying brakes, if both decelerate at the same rate, what happens? |
| A. | The truck will cover less distance before stopping. |
| B. | The car will cover less distance before stopping. |
| C. | Both will cover equal distance. |
| D. | None of the above |
| Answer» C. Both will cover equal distance. | |
| 1114. |
A rocket works on the which law of motion? |
| A. | First law |
| B. | Second law |
| C. | Third law |
| D. | None of these |
| Answer» D. None of these | |
| 1115. |
In a game of tug of wars, a condition of equilibrium exists. Both the teams pull the rope with a force of\[{{10}^{4}}N\]. Find the tension in the rope. |
| A. | \[0N\] |
| B. | \[{{10}^{4}}N\] |
| C. | \[{{10}^{5}}N\] |
| D. | \[2\times {{10}^{4}}N\] |
| Answer» C. \[{{10}^{5}}N\] | |
| 1116. |
A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at the rate of \[1\text{ }kg\text{ }{{s}^{-1}}\] and at a speed of\[5\text{ }m\text{ }{{s}^{-1}}\]. The initial acceleration of the block is |
| A. | \[7.5\text{ }m\text{ }{{s}^{-2}}\] |
| B. | \[1.25\text{ }m\text{ }{{s}^{-2}}\] |
| C. | \[5\text{ }m\text{ }{{s}^{-2}}\] |
| D. | \[2.5\text{ }m\text{ }{{s}^{-2}}\] |
| Answer» E. | |
| 1117. |
A false balance has equal arms. An object weights \[{{w}_{1}}\] when placed in one pan and \[{{w}_{2}}\] when placed in the other pan. Then weight w of the object is |
| A. | \[\sqrt{{{w}_{1}}{{w}_{2}}}\] |
| B. | \[\frac{{{w}_{1}}+{{w}_{2}}}{2}\] |
| C. | \[\left( \frac{{{w}_{1}}^{2}+{{w}_{2}}^{2}}{2} \right)\] |
| D. | \[\sqrt{{{w}_{1}}^{2}+{{w}^{2}}_{2}}\] |
| Answer» C. \[\left( \frac{{{w}_{1}}^{2}+{{w}_{2}}^{2}}{2} \right)\] | |
| 1118. |
When a bus starts suddenly, the passengers are pushed backwards. Which of the following laws is illustrated in this example? |
| A. | Newton's first law |
| B. | Newton's second law |
| C. | Newton's third law |
| D. | None of Newton's laws |
| Answer» B. Newton's second law | |
| 1119. |
A cricket ball of mass \[120\,\,g\] is moving with a velocity of\[12\,\,m\,\,{{s}^{-1}}\]. It turns back and moves with a velocity of \[20\,\,m\,\,{{s}^{-1}}\] when hit by a bat. Find the impulse if the force acts on the ball for\[0.02\,\,s\]. |
| A. | \[4N\,\,s\] |
| B. | \[8N\,\,s\] |
| C. | \[32N\,\,s\] |
| D. | \[192N\,\,s\] |
| Answer» E. | |
| 1120. |
In a tug-of-war between the teams A and B, the rope breakes at a point which is nearer to A. Then |
| A. | A has applied more force |
| B. | B has applied more force |
| C. | A and B both have applied same force |
| D. | None has applied any force |
| Answer» B. B has applied more force | |
| 1121. |
A block is released from rest at the top of a frictionless inclined plane 16 m long. It reaches the bottom 4 sec later. A second block is projected up the plane from the bottom at the instant the block is released in such a way that it returns to the bottom simultaneously with first block. The acceleration of each block on the incline is |
| A. | \[\text{1 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{2 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{4 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» C. \[\text{4 m}/{{\text{s}}^{\text{2}}}\] | |
| 1122. |
Match the entries in Column I with those in Column II. Column-I Column-II[a]Force1.\[N\,\,{{m}^{-2}}\][b]Weight2.\[Kg\][c]Pressure3.\[N\][d]Impulse4.\[N\,\,s\][e]Mass5.\[Kg\,\,wt\] |
| A. | a - 3, b - 2, c - 4, d - 1, e - 5 |
| B. | a - 5, b - 4, c - 3, d - 1, e - 2 |
| C. | a - 3, b - 5, c - 1, d - 4, e - 2 |
| D. | a - 4, b - 2, c - 1, d - 3, e - 5 |
| Answer» D. a - 4, b - 2, c - 1, d - 3, e - 5 | |
| 1123. |
When effort is applied parallel to an inclined frictionless plane making an angle \[\theta \] with the horizontal, then mechanical advantage of the system is |
| A. | |
| B. | \[\tan \theta \] |
| C. | \[\cot \theta \] |
| D. | \[\text{cosec }\theta \] |
| Answer» E. | |
| 1124. |
If the same force is applied on two bodies of different masses for the same time, what happens to the momentum of the two bodies? |
| A. | The momenta increases |
| B. | The momenta decreases |
| C. | The momenta remains the same |
| D. | The momenta may increase or decrease |
| Answer» D. The momenta may increase or decrease | |
| 1125. |
A ball moving with a velocity u strikes a wall moving toward the ball with a velocity u. An elastic impact lasts for t sec. Then the mean elastic force acting on the ball is |
| A. | \[\frac{2m\upsilon }{t}\] |
| B. | \[\frac{2m(\upsilon +u)}{t}\] |
| C. | \[\frac{2m(\upsilon +2u)}{t}\] |
| D. | \[\frac{m(\upsilon +2u)}{t}\] |
| Answer» C. \[\frac{2m(\upsilon +2u)}{t}\] | |
| 1126. |
A bullet of mass \[60\,\,g\] moving with a velocity of \[500\,\,m\,\,{{s}^{-1}}\] is brought to rest in 0.01 s. Find the impulse and the average force of the blow. |
| A. | \[-3\,\,N\,\,s,\,\,3\,\,k\,\,N\] |
| B. | \[-30\,\,N\,\,s,\,\,-3\,\,k\,\,N\] |
| C. | \[-50\,\,N\,\,s,\,\,-5\,\,k\,\,N\] |
| D. | \[-60\,\,N\,\,s,\,\,-6\,\,k\,\,N\] |
| Answer» C. \[-50\,\,N\,\,s,\,\,-5\,\,k\,\,N\] | |
| 1127. |
Momentum has the same units as that of |
| A. | Impulse |
| B. | Torque |
| C. | Moment of momentum |
| D. | Couple |
| Answer» B. Torque | |
| 1128. |
A motor car running at the rate of \[7\,\,m\,\,{{s}^{-1}}\] is stopped by applying the brakes after it travels\[10\,\,m\]. Find the total resistance to the motion when the brakes are on. |
| A. | It is one-fourth of the weight of the car. |
| B. | It is two-thirds of the weight of the car. |
| C. | It is one-eighth of the weight of the car. |
| D. | It is four-fifths of the weight of the car. |
| Answer» B. It is two-thirds of the weight of the car. | |
| 1129. |
Momentum is a measure of |
| A. | Weight |
| B. | Mass |
| C. | Quantity of motion |
| D. | Velocity |
| Answer» D. Velocity | |
| 1130. |
China wares are wrapped in straw or paper before packing. What is the basis of this application? |
| A. | Impulse |
| B. | Momentum |
| C. | Acceleration |
| D. | Force |
| Answer» B. Momentum | |
| 1131. |
The velocity-time graph of a ball moving on the surface of a floor is given below. Calculate the force acting on the ball, if the mass of the ball is\[200\,\,g\]. |
| A. | \[1\,\,N\] |
| B. | \[2\,\,N\] |
| C. | \[5\,\,N\] |
| D. | \[8\,\,N\] |
| Answer» B. \[2\,\,N\] | |
| 1132. |
The combined effect of mass and velocity is taken into account by a physical quantity called |
| A. | Torque |
| B. | Moment of force |
| C. | Momentm |
| D. | Moment of momentum |
| Answer» D. Moment of momentum | |
| 1133. |
A stone is tied to the middle of a string and suspended from one end as shown in the figure. Here S is the stone and 0 is the pint of suspension. (ii) If we increase the pull at P gradually, the string will break |
| A. | Below the stone |
| B. | At the point P itself |
| C. | Above the stone |
| D. | Nothing can be decided |
| Answer» D. Nothing can be decided | |
| 1134. |
A cricket ball of mass \[500\,\,g\] is moving with a speed of\[36\,\,km\,\,{{h}^{-1}}\]. It is reflected with the same speed. What is the impulse applied on it? |
| A. | \[20\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| B. | \[5\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| C. | \[25\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| D. | \[10\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| Answer» E. | |
| 1135. |
A stone is tied to the middle of a string and suspended from one end as shown in the figure. Here S is the stone and 0 is the pint of suspension. (i) If you give a sharp jerk at P, the string will break |
| A. | Below the stone |
| B. | At the point P itself |
| C. | From above the stone |
| D. | Nothing can be decided |
| Answer» B. At the point P itself | |
| 1136. |
A force acts for \[10s\] on a body of mass \[10\,\,kg\] after which the force ceases and the body travels \[50\,\,m\] in the next\[5\,\,s\]. Find the magnitude of the force. |
| A. | \[5\,\,N\] |
| B. | \[10\,\,N\] |
| C. | \[15\,\,N\] |
| D. | \[50\,\,N\] |
| Answer» C. \[15\,\,N\] | |
| 1137. |
A shell is fired from a cannon with a velocity u at an angle \[\theta \] with the horizontal direction. At the highest point in its path, it explodes into two pieces of equal mass. One of the pieces retraces its path of the cannon. Speed of the other piece immediately after the explosion is |
| A. | \[3\,v\,\cos \,\theta \] |
| B. | \[2\,v\,\cos \,\theta \] |
| C. | \[\frac{3}{2}\,v\,\cos \,\theta \] |
| D. | \[\frac{\sqrt{3}}{2}\,v\,\cos \,\theta \] |
| Answer» B. \[2\,v\,\cos \,\theta \] | |
| 1138. |
If soldiers had the options to use guns of different weights but the bullets used are of a fixed weight, what would they prefer and why? |
| A. | Light guns, because handling them is easy |
| B. | Heavy guns, because they can be held firmly |
| C. | Heavy guns because they have less recoil |
| D. | Light guns, because they can be carried easily |
| Answer» D. Light guns, because they can be carried easily | |
| 1139. |
Figure shows the displacement of a particle going along the x-axis as function of time. The force acting on the particle is zero in the region |
| A. | AB |
| B. | BC |
| C. | CE |
| D. | DE. |
| Answer» B. BC | |
| 1140. |
How much mass (approximately) of a body one can hold/when a force of \[1\,\,N\] is applied on it? |
| A. | \[100\,\,mg\] |
| B. | \[100\,\,g\] |
| C. | \[1\,\,kg\] |
| D. | \[10\,\,kg\] |
| Answer» C. \[1\,\,kg\] | |
| 1141. |
If a rock is brought from the surface of the moon, then |
| A. | Its mass will change |
| B. | Its weight will change, but not mass |
| C. | Both mass and weight will change |
| D. | Its mass and weight will remain the same |
| Answer» C. Both mass and weight will change | |
| 1142. |
A rear side of a truck is open and a box of mass 20 kg is placed on the truck 4 metres away from the open end. \[\mu =0.15\] and\[\text{g }=\text{ 1}0\text{ m}/{{\text{s}}^{\text{2}}}\]. The truck starts from rest with an acceleration of \[\text{2 m}/{{\text{s}}^{\text{2}}}\]on a straight road. The box will fall off the truck when it is at a distance from the starting point equal to |
| A. | 4 metres |
| B. | 8 metres |
| C. | 16 metres |
| D. | 32 metres |
| Answer» D. 32 metres | |
| 1143. |
A \[10\,\,N\] force applied on a body produces in it an acceleration of\[2\,\,m\,\,{{s}^{-2}}\]. What is the mass of the body? |
| A. | \[20\,\,kg\] |
| B. | \[0.2\,\,kg\] |
| C. | \[5\,\,kg\] |
| D. | \[200\,\,g\] |
| Answer» D. \[200\,\,g\] | |
| 1144. |
A 40 kg slab rests on a frictionless floor. A 10 kg block rests on top of the slab. The static coefficient of friction between the block and the slab is 0.60 while the kinetic coefficient is 0.40. The 10 kg block is acted upon by horizontal force 100N. If\[\text{g }=\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}}\], then resulting acceleration of the slab will be |
| A. | \[0.\text{98 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{1}.\text{47 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{1}.\text{52 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{6}.\text{1 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» B. \[\text{1}.\text{47 m}/{{\text{s}}^{\text{2}}}\] | |
| 1145. |
If action and reaction were to act on the same body, then |
| A. | Resultant would be zero |
| B. | Body would not move at all |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» D. None of these | |
| 1146. |
A cricket ball weighing \[100\,\,g\] and moving with a speed of \[20\,\,m\,\,{{s}^{-1}}\] strikes a bat and remains in contact with it for\[0.1\,\,s\]. What is the force exerted by the ball on the bat? |
| A. | \[100\,\,N\] |
| B. | \[-10\,\,N\] |
| C. | \[-40\,\,N\] |
| D. | \[1N\] |
| Answer» D. \[1N\] | |
| 1147. |
Which of the following physical quantities has the same units as that of impulse? |
| A. | Momentum |
| B. | Force |
| C. | Torque |
| D. | Couple |
| Answer» B. Force | |
| 1148. |
A number of discs, each of momentum M kg m/s are striking a wall at the rate of n discs per minute. The force associated with these discs, in new tons, would be |
| A. | \[\frac{Mn}{60}\] |
| B. | \[60\,mn\] |
| C. | \[\frac{M}{60\,n}\] |
| D. | \[\frac{n}{60M}\] |
| Answer» B. \[60\,mn\] | |
| 1149. |
On what factors does the inertia of motion depend? |
| A. | Mass |
| B. | Velocity |
| C. | Acceleration |
| D. | Displacement |
| Answer» B. Velocity | |
| 1150. |
In the above question, the time after which the centres of gravity of the two bodies will have a separation h, is |
| A. | \[\sqrt{\frac{h}{g}{{\left( \frac{{{m}_{2}}+{{m}_{2}}}{{{m}_{2}}-{{m}_{2}}} \right)}^{2}}}\] |
| B. | \[\sqrt{\frac{h}{g}\left( \frac{{{m}_{1}}+{{m}_{2}}}{{{m}_{1}}-{{m}_{2}}} \right)}\] |
| C. | \[\sqrt{\frac{2h}{g}\left( \frac{{{m}_{2}}+{{m}_{2}}}{{{m}_{2}}-{{m}_{2}}} \right)}\] |
| D. | \[\sqrt{\frac{h}{2g}\left( \frac{{{m}_{2}}+{{m}_{2}}}{{{m}_{2}}-{{m}_{2}}} \right)}\] |
| Answer» C. \[\sqrt{\frac{2h}{g}\left( \frac{{{m}_{2}}+{{m}_{2}}}{{{m}_{2}}-{{m}_{2}}} \right)}\] | |