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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.
| 1051. |
When a man in a boat in river jumps from it on river shore, the boat moves |
| A. | Forward |
| B. | Backward |
| C. | To right side |
| D. | To left side |
| Answer» C. To right side | |
| 1052. |
Newton's second law of motion measures |
| A. | Inertia |
| B. | momentum |
| C. | Impulse |
| D. | force |
| Answer» E. | |
| 1053. |
Newton's first law of motion defines |
| A. | Both inertia and force |
| B. | Only inertia |
| C. | Only force |
| D. | Nothing |
| Answer» B. Only inertia | |
| 1054. |
A particle of mass moving eastward with a speed v collides with another particle of the same mass moving northwards with the same speed u. The two particles coalesce on collision. The new particle of mass 2 m will move in the northeasterly direction with a velocity |
| A. | \[\frac{\sqrt{\upsilon }}{\sqrt{2}}\] |
| B. | \[\frac{\upsilon }{2}\] |
| C. | \[\frac{\upsilon }{\sqrt{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 1055. |
Frictional force increases when surfaces in contact are made very smooth, because of |
| A. | Molecular force |
| B. | Decrease in surface area |
| C. | Decrease in irregularities |
| D. | Increase in area |
| Answer» B. Decrease in surface area | |
| 1056. |
Rolling friction |
| A. | is independent of velocity |
| B. | Varies with velocity |
| C. | Increases with velocity |
| D. | Decreases with velocity |
| Answer» B. Varies with velocity | |
| 1057. |
Fluid friction |
| A. | Is independent of velocity |
| B. | Increases with velocity |
| C. | Decreases with velocity |
| D. | None of these |
| Answer» C. Decreases with velocity | |
| 1058. |
Relation between coefficient of friction \[\mu \] and angle of friction is |
| A. | \[\mu =\sin \theta \] |
| B. | \[\mu =\cos \theta \] |
| C. | \[\mu =\tan \theta \] |
| D. | None of these |
| Answer» D. None of these | |
| 1059. |
Vehicles are streamlined to reduce |
| A. | Static friction |
| B. | kinetic friction |
| C. | Fluid friction |
| D. | sliding friction |
| Answer» D. sliding friction | |
| 1060. |
If \[{{\mu }_{\kappa }}\]is coefficient of kinetic friction and \[{{\mu }_{s}}\] is coefficient of static friction, then |
| A. | \[{{\mu }_{\kappa }}<{{\mu }_{s}}\] |
| B. | \[{{\mu }_{s}}<{{\mu }_{\kappa }}\] |
| C. | \[{{\mu }_{\kappa }}={{\mu }_{s}}\] |
| D. | \[{{\mu }_{s}}\le {{\mu }_{\kappa }}\] |
| Answer» B. \[{{\mu }_{s}}<{{\mu }_{\kappa }}\] | |
| 1061. |
Buoyant force depends on the |
| A. | Depth of a liquid |
| B. | Density of liquid |
| C. | Colour of a liquid |
| D. | None of these |
| Answer» C. Colour of a liquid | |
| 1062. |
If a block has been placed an inclined plane having slope angle \[\theta \]such that the block slides down the plane at a constant speed, then coefficient of kinetic friction will be |
| A. | \[\sin \,\theta \] |
| B. | \[\cos \,\theta \] |
| C. | \[g\] |
| D. | \[\tan \,\theta \] |
| Answer» E. | |
| 1063. |
Direction: Read the passage carefully and answer the following question.An object of mass 1.5 kg travelling in a straight line with a velocity of \[5\text{ }m\text{ }{{s}^{-1}}\] collides with a wooden block of mass 5 kg resting on the floor.This object sticks with wooden block after collision and both move together in a straight line.The total momentum after collision is |
| A. | \[3.5\text{ }kg\text{ }m\text{ }{{s}^{-1}}\] |
| B. | \[1.5\text{ }kg\text{ }m\text{ }{{s}^{-1}}\] |
| C. | \[7.5\text{ }kg\text{ }m\text{ }{{s}^{-1}}\] |
| D. | \[2\text{ }kg\text{ }m\text{ }{{s}^{-1}}\] |
| Answer» D. \[2\text{ }kg\text{ }m\text{ }{{s}^{-1}}\] | |
| 1064. |
A machine gun fires \[n\] bullets per second and the mass of each bullet is m. If speed of bullets is u, then force exerted on the machine gun will be |
| A. | \[mng\] |
| B. | \[mn\upsilon \] |
| C. | \[mn\upsilon g\] |
| D. | \[\frac{mn\upsilon }{g}\] |
| Answer» C. \[mn\upsilon g\] | |
| 1065. |
Consider two spring balances hooked as shown in the figure. We pull them in opposite directions. If the reading shown by A is 1.5 N, the reading shown by B will be |
| A. | 1.5 N |
| B. | 2.5 N |
| C. | 3.0 N |
| D. | Zero. |
| Answer» B. 2.5 N | |
| 1066. |
Which of the following physical quantities has no unit? |
| A. | Relative density |
| B. | Density |
| C. | Pressure |
| D. | Thrust |
| Answer» B. Density | |
| 1067. |
On which of the following do action-reaction forces act upon? |
| A. | Same body |
| B. | Different bodies |
| C. | Along different lines |
| D. | In the same direction |
| Answer» C. Along different lines | |
| 1068. |
The density of water is |
| A. | \[\text{1}{{0}^{-\text{3}}}\text{ kg}{{\text{m}}^{-\text{3}}}\] |
| B. | \[\text{1}{{0}^{-2}}\text{ kg}{{\text{m}}^{-\text{3}}}\] |
| C. | \[\text{1}{{0}^{2}}\text{ kg}{{\text{m}}^{-\text{3}}}\] |
| D. | \[\text{1}{{0}^{3}}\text{ kg}{{\text{m}}^{-\text{3}}}\] |
| Answer» E. | |
| 1069. |
Any solid will sink in water if its relative density is .....unity |
| A. | less than |
| B. | equal to |
| C. | Greater than |
| D. | none of these |
| Answer» D. none of these | |
| 1070. |
If a man of weight W is standing in a lift moving upward with an acceleration a, then apparent weight of the man will be |
| A. | \[W\left( 1+\frac{a}{g} \right)\] |
| B. | \[W\left( 1-\frac{a}{g} \right)\] |
| C. | \[W\left( 1-\frac{{{a}^{2}}}{{{g}^{2}}} \right)\] |
| D. | none of these |
| Answer» B. \[W\left( 1-\frac{a}{g} \right)\] | |
| 1071. |
Friction is a/an |
| A. | Self-adjusting force |
| B. | Necessary evil |
| C. | Important force in daily life |
| D. | All of these |
| Answer» E. | |
| 1072. |
For a particle moving along a circular path with a constant speed, the acceleration is constant in |
| A. | Magnitude |
| B. | Direction |
| C. | Both magnitude and direction |
| D. | Neither magnitude nor direction |
| Answer» B. Direction | |
| 1073. |
kg \[\text{m}{{\text{s}}^{\text{-1}}}\]is the SI unit of |
| A. | Impulse |
| B. | force |
| C. | Angular velocity |
| D. | none of these |
| Answer» B. force | |
| 1074. |
When a net force acts on an object, then the object will accelerate in the direction of force with an acceleration proportional to the |
| A. | Force on the object |
| B. | Velocity of the object |
| C. | Mass of the object |
| D. | Inertia of the object |
| Answer» B. Velocity of the object | |
| 1075. |
Passengers standing in a bus are thrown outwards when the bus takes a sudden turn, |
| A. | Outward pull on them |
| B. | Inertia |
| C. | Change in momentum |
| D. | Change in acceleration |
| Answer» C. Change in momentum | |
| 1076. |
To which of the following laws is the principle of conservation of linear momentum equivalent? |
| A. | Newton's first law of motion |
| B. | Newton's second law of motion |
| C. | Newton's third law of motion |
| D. | Faraday's Laws |
| Answer» D. Faraday's Laws | |
| 1077. |
Weight of a body would not be zero |
| A. | At the centre of the earth |
| B. | During a free fall |
| C. | In interplanetary space |
| D. | On a frictionless surface |
| Answer» E. | |
| 1078. |
What does the principle of conservation of linear momentum state? |
| A. | The linear momentum of a system cannot be changed. |
| B. | The linear momentum of a system cannot remain constant. |
| C. | The linear momentum of a system can be changed only if internal forces act. |
| D. | The linear momentum of a system can be changed only if external forces acts on it. |
| Answer» E. | |
| 1079. |
When a force of 1 newton acts on a mass of 1 kg that is able to move freely, the object moves with a |
| A. | Speed of 1 \[\text{m}{{\text{s}}^{\text{-1}}}\] |
| B. | Acceleration of 1 \[\text{m}{{\text{s}}^{\text{-2}}}\] |
| C. | Speed of 1 k \[\text{m}{{\text{s}}^{\text{-1}}}\] |
| D. | None of these |
| Answer» C. Speed of 1 k \[\text{m}{{\text{s}}^{\text{-1}}}\] | |
| 1080. |
Physical independence of force is a con-sequence of\['X'\]. Identify\['X'\]. |
| A. | Newton's third law of motion |
| B. | Newton's second law of motion |
| C. | Newton's first law of motion |
| D. | All of the above |
| Answer» D. All of the above | |
| 1081. |
The ratio of force and acceleration is |
| A. | Velocity |
| B. | impulse |
| C. | Momentum |
| D. | none of these |
| Answer» B. impulse | |
| 1082. |
A force of \[200\,\,N\] acts on a body of mass \[2\,\,kg\] for\[10\,\,s\]. Find the change in the momentum of the body. |
| A. | \[1000\,\,N\,\,s\] |
| B. | \[250\,\,N\,\,s\] |
| C. | \[500\,\,N\,\,s\] |
| D. | \[2000\,\,N\,\,s\] |
| Answer» E. | |
| 1083. |
When a constant force is applied to a body, it moves with uniform |
| A. | Acceleration |
| B. | velocity |
| C. | Speed |
| D. | momentum |
| Answer» B. velocity | |
| 1084. |
A lift is moving down with a retardation of\[5\,\,m\,\,{{s}^{-2}}\]. Calculate the percentage change in the weight of the person in the lift\[(g=10\,\,m\,\,{{s}^{-2}})\]. |
| A. | \[-25\] |
| B. | \[-50\] |
| C. | \[-75\] |
| D. | \[-100\] |
| Answer» C. \[-75\] | |
| 1085. |
The SI unit offered is |
| A. | Dyne |
| B. | gram-weight |
| C. | Newton |
| D. | None of these |
| Answer» D. None of these | |
| 1086. |
What is the average force necessary to stop a hammer with a momentum of \[25\,\,N\,\,s\] in\[0.05\,\,s\]? |
| A. | \[500\,\,N\] |
| B. | \[125\,\,N\] |
| C. | \[50\,\,N\] |
| D. | \[25\,\,N\] |
| Answer» B. \[125\,\,N\] | |
| 1087. |
A body is said to be under balanced forces when the resultant force acting on the body is |
| A. | Unity |
| B. | zero |
| C. | Infinite |
| D. | none of these |
| Answer» C. Infinite | |
| 1088. |
A gun fires a bullet of mass \[50\,\,g\] with a velocity of\[30\,\,m\,\,{{s}^{-1}}\]. Because of this, the gun is pushed back with a velocity of 1 m s-1.What is the mass of the gun? |
| A. | \[3.5\,\,kg\] |
| B. | \[30\,\,kg\] |
| C. | \[1.5\,\,kg\] |
| D. | \[20\,\,kg\] |
| Answer» D. \[20\,\,kg\] | |
| 1089. |
When a body is in translatory equilibrium |
| A. | The body is definitely at rest |
| B. | The body is definitely in the state of uniform motion |
| C. | The body will be either at rest or in the state or uniform motion |
| D. | None of these |
| Answer» C. The body will be either at rest or in the state or uniform motion | |
| 1090. |
Which of the following safety features are used in vehicles to reduce the negative effects of inertia? (i) Safety seat belts (ii) Automatic air bags (iii) Absorber bumpers |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 1091. |
When a body is stationary |
| A. | There is no force acting on it |
| B. | The forces acting on it are not in contact with it |
| C. | The combination of force acting on it balance each other |
| D. | The body in vacuum |
| Answer» D. The body in vacuum | |
| 1092. |
Which of the statements given below are applicable for an object to move in a circle? |
| A. | The object must continuously slow down. |
| B. | The object must accelerate. |
| C. | The object must be acted on by external balanced forces. |
| D. | The object must move with uniform velocity. |
| Answer» C. The object must be acted on by external balanced forces. | |
| 1093. |
Fuel is consumed at the rate of 100 kg/sec in a rocket. The exhaust gases are ejected at a speed of \[\text{4}.\text{5 }\times \text{ 1}{{0}^{-\text{4}}}\text{ m}/\text{s}\]. Then the thrust experienced by he rocket is |
| A. | \[\text{4}.\text{5 x 1}{{0}^{\text{6}}}\text{ N}\] |
| B. | \[\text{5}.\text{5 x 1}{{0}^{\text{6}}}\text{ N}\] |
| C. | \[\text{3}.\text{5 x 1}{{0}^{\text{6}}}\text{ N}\] |
| D. | \[\text{6}.\text{72 x 1}{{0}^{\text{6}}}\text{ N}\] |
| Answer» B. \[\text{5}.\text{5 x 1}{{0}^{\text{6}}}\text{ N}\] | |
| 1094. |
A machine gun of mass \[12\,\,kg\] fires \[25\,\,g\] bullets at the rate of \[4\] bullets per second with a velocity of\[500\,\,m\,\,{{s}^{-1}}\]. What force must be applied to the gun to hold it in position? |
| A. | \[20N\] |
| B. | \[12.5N\] |
| C. | \[50N\] |
| D. | \[75N\] |
| Answer» D. \[75N\] | |
| 1095. |
Which of the following balls is easier to catch even though all of them are moving with the same velocity? |
| A. | Tennis ball |
| B. | Cricket ball |
| C. | Basketball |
| D. | Both cricket and basket ball |
| Answer» B. Cricket ball | |
| 1096. |
A hammer weighing 2.5 kg moving with a speed of \[1\text{ }m\text{ }{{s}^{-1}}\] strikes the head of the nail driving it 10 cm into the wall. The acceleration during impact and the impulse imparted to wall will be respectively |
| A. | \[-5m\text{ }{{s}^{-2}},\text{ }2.5\text{ }N\text{ }s\] |
| B. | \[-\text{ }10\text{ }m\text{ }{{s}^{-2}},\text{ }5\text{ }N\text{ }s\] |
| C. | \[-\text{ }7.5\text{ }m\text{ }{{s}^{-2}},\text{ }3.5\text{ }N\text{ }s\] |
| D. | \[-6m\text{ }{{s}^{-2}},\text{ }4\text{ }N\text{ }s\] |
| Answer» B. \[-\text{ }10\text{ }m\text{ }{{s}^{-2}},\text{ }5\text{ }N\text{ }s\] | |
| 1097. |
A 6000 kg rocket is set for vertical firing. If the exhaust speed is 1000 m/s, how much gas must be ejected each second to supply the thrust needed to overcome the weight of the rocket? |
| A. | 22.2 m/s |
| B. | 37.6 kg/sec |
| C. | 58.8 kg/sec |
| D. | None of these |
| Answer» D. None of these | |
| 1098. |
A force of a given magnitude acts on a body. On what factors does the acceleration of the body depend? |
| A. | Density of the body |
| B. | Volume of the body |
| C. | Mass of the body |
| D. | Shape of the body |
| Answer» D. Shape of the body | |
| 1099. |
A force acts on a body of mass \[3\,\,kg\] such that its velocity changes from \[4\,\,m\,\,{{s}^{-1}}\] to \[10\,\,m\,\,{{s}^{-1}}\].Calculate the change in the momentum of the body. |
| A. | \[2\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| B. | \[14\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| C. | \[18\,\,kg\,m\,\,{{s}^{-1}}\] |
| D. | \[42\,\,kg\,\,m\,\,{{s}^{-1}}\] |
| Answer» D. \[42\,\,kg\,\,m\,\,{{s}^{-1}}\] | |
| 1100. |
A rocket of initial mass 6000 kg ejects mass at a constant rate of 16 kg/sec with constant relative speed of 11 km/sec. What is the acceleration of the rocket a minute after the blast? (Neglect gravity) |
| A. | \[\text{28}.\text{7 m}/{{\text{s}}^{\text{2}}}\] |
| B. | \[\text{34}.\text{9 m}/{{\text{s}}^{\text{2}}}\] |
| C. | \[\text{39}.\text{4 m}/{{\text{s}}^{\text{2}}}\] |
| D. | \[\text{27}.\text{8 m}/{{\text{s}}^{\text{2}}}\] |
| Answer» C. \[\text{39}.\text{4 m}/{{\text{s}}^{\text{2}}}\] | |