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MCQOPTIONS
This section includes 317 Mcqs, each offering curated multiple-choice questions to sharpen your UPSC IAS Exam knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Match List I (Items) with List II (Unit of length) and select the correct answer by using the codes given below the lists. List I (Items) List II (Units of length)A.Distance between earth and stars1MicronsB.Interatomic distances in a solid2AngstromsC.Size of the nucleus3Light yearsD.Wavelength of infrared laser4Fermi 5kilometres |
| A. | A-5, B-4, C-2, D-1 |
| B. | A-3, B-2, C-4, D-1 |
| C. | A-5, B-2, C-4, D-3 |
| D. | A-3, B-4, C-1, D-2 |
| Answer» E. | |
| 102. |
Which one of the following pairs does not have the same dimension? [NDA] |
| A. | Potential energy and kinetic energy |
| B. | Density and specific gravity |
| C. | Focal length and height |
| D. | Gravitational force and frictional force |
| Answer» C. Focal length and height | |
| 103. |
Match List I (Physical quantity) with list II (Units) and select the correct answer by using the codes given below the lists. List I (Physical quantity) List II (Units) A. Solid angle 1. Pascal B. Impulse 2. Steradian C. Vicosity 3. Newton-second D. Pressure 4. Pascal-second |
| A. | A-2, B-4, C-3, D-1 |
| B. | A-2, B-3, C-4, D-1 |
| C. | A-1, B-4, C-3, D-2 |
| D. | A-1, B-3, C-4, D-2 |
| Answer» C. A-1, B-4, C-3, D-2 | |
| 104. |
S.I. unit of surface tension is |
| A. | degree/cm |
| B. | N/m |
| C. | \[N/{{m}^{2}}\] |
| D. | N m |
| Answer» C. \[N/{{m}^{2}}\] | |
| 105. |
'Farad' is the unit of [SSC CGL] |
| A. | resistance |
| B. | conductance |
| C. | capacitance |
| D. | inductance |
| Answer» D. inductance | |
| 106. |
What is the correct sequence in which the lengths of the following units increase? 1. Angstrom 2. Micron 3. Nanometer Select the correct answer using the code given below: [NDA] |
| A. | 1, 2, 3 |
| B. | 3, 1, 2 |
| C. | 1, 3, 2 |
| D. | 2, 3, 1 |
| Answer» D. 2, 3, 1 | |
| 107. |
Match List I (Physical quantity) with List II (Units) and select the correct answer using the codes given below the lists.List I (Physical quantity) (Units)List II (Physical quantity)A. Power1. kg \[m{{s}^{-1}}\]B. Energy2. kg \[{{m}^{2}}{{s}^{-1}}\]C. Momentum3. \[N{{m}^{-2}}\]D. Pressure4. kW 5. kWh |
| A. | A-4, B-5, C-1, D-3 |
| B. | A-4, B-5, C-1, D-2 |
| C. | A-5, B-4, C-1, D-2 |
| D. | A-5, B-4, C-2, D-3 |
| Answer» B. A-4, B-5, C-1, D-2 | |
| 108. |
Match List I (Units) with List II (Physical quantity) and select the correct answer using the codes given below the lists. [CDS] List I (Units) List II Physical quantity)[A]Watt1.Electric charge[B]Tesla2.Power[C]Coulomb3.Luminous intensity[D]Candela4Magnetic field |
| A. | A-1, B-4, C-1, D-3 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-1, B-2, C-4, D-3 |
| D. | A-2, B-4, C-3, D-1 |
| Answer» B. A-1, B-2, C-3, D-4 | |
| 109. |
Which of the following systems of units is not based on units of mass, length and time alone? |
| A. | SI |
| B. | MKS |
| C. | CGS |
| D. | FPS |
| Answer» B. MKS | |
| 110. |
If a ship moves from freshwater into seawater, it will [CDS] |
| A. | sink completely |
| B. | sink a little bit |
| C. | rise a little higher |
| D. | remain unaffected |
| Answer» D. remain unaffected | |
| 111. |
The pressure exerted on the ground by a man is greatest [CDS] |
| A. | when the lies down in the ground |
| B. | when the stands on the toes of one foot |
| C. | when the stands with both foot flat on the ground |
| D. | all of the above yield the same pressure |
| Answer» C. when the stands with both foot flat on the ground | |
| 112. |
A gymnast takes turns with her arms & legs stretched. When she pulls her arms and legs [CDS] |
| A. | the angular velocity decreases |
| B. | the moment of inertia decreases |
| C. | the angular velocity stays constant |
| D. | the angular momentum increases |
| Answer» C. the angular velocity stays constant | |
| 113. |
For a given mass and size, moment of inertia of a solid disc is |
| A. | more than that of a ring |
| B. | less than that of a ring |
| C. | equal to that of a ring |
| D. | depend on the material of ring and disc |
| Answer» C. equal to that of a ring | |
| 114. |
During summersault, a swimmer bends his body to |
| A. | increase moment of Inertia |
| B. | decrease moment of Inertia |
| C. | decrease the angular momentum |
| D. | reduce the angular velocity |
| Answer» C. decrease the angular momentum | |
| 115. |
A composite disc is to be made using equal masses of aluminium and iron so that it has as high a moment of inertia as possible. This is possible when |
| A. | the surfaces of the disc are made of iron with aluminium inside |
| B. | the whole of aluminium is kept in the core and the iron at the outer rim of the disc |
| C. | the whole of the iron is kept in the core and the aluminium at the outer rim of the disc |
| D. | the whole disc is made with thin alternate sheets of iron and aluminium |
| Answer» C. the whole of the iron is kept in the core and the aluminium at the outer rim of the disc | |
| 116. |
A fan is moving around its axis, What will be its motion regarded as? |
| A. | Pure rolling |
| B. | Rolling with shipping |
| C. | Skidding |
| D. | Pure rotation |
| Answer» E. | |
| 117. |
For a particle revolving in a circular path, the acceleration of the particle is [NDA] |
| A. | along the tangent |
| B. | along the radius |
| C. | zero |
| D. | along the circumference of the circle |
| Answer» C. zero | |
| 118. |
The wide handle of screw is based upon |
| A. | Newton's second law of motion |
| B. | law of conservation of linear momentum |
| C. | turning moment of force |
| D. | None of these |
| Answer» D. None of these | |
| 119. |
A simple machine helps a person in doing: [IAS Prelim] |
| A. | less work |
| B. | the same amount of work with lesser force |
| C. | the same amount of work slowly |
| D. | the same amount of work much faster |
| Answer» C. the same amount of work slowly | |
| 120. |
A couple is acting on a two particle systems. The resultant motion will be |
| A. | purely rotational motion |
| B. | purely linear motion |
| C. | both a and b |
| D. | neither of a and b |
| Answer» B. purely linear motion | |
| 121. |
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected? |
| A. | Angular velocity |
| B. | Angular momentum |
| C. | Moment of inertia |
| D. | Rotational kinetic energy |
| Answer» C. Moment of inertia | |
| 122. |
A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by [NDA] |
| A. | the book on the table |
| B. | the book on the earth |
| C. | the table on the book |
| D. | the table on the earth |
| Answer» D. the table on the earth | |
| 123. |
Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is |
| A. | v |
| B. | v/3 |
| C. | v/2 |
| D. | zero |
| Answer» D. zero | |
| 124. |
No work is done when |
| A. | a nail is plugged into a wooden board |
| B. | a box is pushed along a horizontal floor |
| C. | there is no component of force parallel to the direction of motion |
| D. | there is no component of force normal to the direction of force |
| Answer» E. | |
| 125. |
When you compress a coil spring you do work on it. The elastic potential energy |
| A. | increases |
| B. | decreases |
| C. | disappears |
| D. | remains the same |
| Answer» B. decreases | |
| 126. |
Gravitational potential energy of an object will |
| A. | increase by increasing the path along which the object is moved |
| B. | decrease by increasing the path along w4iich the object is moved |
| C. | not effected by changing the path, provided the overall height is same |
| D. | None of these |
| Answer» D. None of these | |
| 127. |
Rahul takes I minute to raise a box to a height of 1 metre and Rohan takes 1/2 minute to do so. Comment on the energy by the two. |
| A. | Energy spent by the Rahul is more. |
| B. | Energy spent by both Rahul and Rohan is same. |
| C. | Energy spent by the Rohan is more |
| D. | Cannot be said |
| Answer» C. Energy spent by the Rohan is more | |
| 128. |
Two persons do the same amount of work, one in 10 s and the other in 20 s. Find the ratio of the power used by the first person to that by the second person. |
| A. | 6 : 4 |
| B. | 2 : 1 |
| C. | 5 : 2 |
| D. | 4 : 3 |
| Answer» C. 5 : 2 | |
| 129. |
An electrical appliance of 500 W is used for 5 hours per day. Energy consumed in 30 days will be |
| A. | 2.5 kWh |
| B. | 25 kWh |
| C. | 75 kWh |
| D. | None of these |
| Answer» D. None of these | |
| 130. |
A boy has four options to move a body through 3m as indicated. In which case is maximum work done? |
| A. | Push over an inclined plane |
| B. | Lift vertically upwards |
| C. | Push over smooth rollers |
| D. | Push on a plane horizontal surface |
| Answer» C. Push over smooth rollers | |
| 131. |
Assertion: A man gets completely exhausted in trying to push a stationary wall. Reason: Work done by the man on the wall is zero. |
| A. | If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. |
| B. | If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. |
| C. | If Assertion is correct but Reason is incorrect. |
| D. | If Assertion is incorrect but Reason is correct. |
| Answer» B. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. | |
| 132. |
In which of the following examples, work done is negative? |
| A. | Work done by the force of gravity on a moving aeroplane |
| B. | Work done by the force of gravity on a ball thrown upwards |
| C. | Work done by the force of gravity on a freely falling object |
| D. | Work done by the force of gravity on a satellite |
| Answer» C. Work done by the force of gravity on a freely falling object | |
| 133. |
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by [NDA] |
| A. | the theory of relativity |
| B. | Newton?s first law |
| C. | Newton?s second law |
| D. | Newton?s third law |
| Answer» C. Newton?s second law | |
| 134. |
Which one among the following is correct for resultant of balanced forces? [NDA] |
| A. | It is zero |
| B. | It is non-zero |
| C. | It varies continuously |
| D. | None of the above |
| Answer» B. It is non-zero | |
| 135. |
The potential energy of a freely falling object decreases progressively. |
| A. | The law of conservation of energy is violated |
| B. | Potential energy gets converted into kinetic energy progressively |
| C. | Sum of Potential Energy and Kinetic Energy at any point during the free fall remains constant |
| D. | Both [b] and [c] |
| Answer» E. | |
| 136. |
A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds. |
| A. | 6m |
| B. | 12m |
| C. | 18m |
| D. | 24m |
| Answer» D. 24m | |
| 137. |
If a light body and a heavy body have equal momentum, then [NDA] |
| A. | the lighter body has greater energy than the heavier body |
| B. | the lighter body has lesser kinetic energy than the heavier body |
| C. | the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body |
| D. | the kinetic energy of both the bodies are independent of momentum. |
| Answer» D. the kinetic energy of both the bodies are independent of momentum. | |
| 138. |
A particle oscillates in one dimension about the equilibrium position subject to a force \[{{F}_{xx}}(x)\] that has an associated potential energy U(x). If k is the force constant, which one of the following relations is true? [NDA] |
| A. | \[{{F}_{x}}(x)=k{{x}^{2}}\] |
| B. | \[{{F}_{x}}(x)=kx\] |
| C. | \[U(x)=\frac{1}{2}kx\] |
| D. | \[U(x)=\frac{1}{2}{{k}^{2}}x\] |
| Answer» C. \[U(x)=\frac{1}{2}kx\] | |
| 139. |
Which one of the following physical quantities is represented by the shaded area in the given graph? |
| A. | Torque |
| B. | Impulse |
| C. | Power |
| D. | Work done |
| Answer» E. | |
| 140. |
Match the Column I and Column II. Column-I A.Electric motorP.Electrical energy to sound energyB.Electric bellQ.Electrical energy to mechanical energyC.Electric bulb electricalR.Light energy to EnergyD.Photoelectric mechanicalS.Heat energy to cell energyE.Steam engine light EnergyT.Electric energy to |
| A. | A-P; B-Q; C-T; D-R; E-S |
| B. | A-Q; B-P; C-T; D-T; E-S |
| C. | A-Q; B-P; C-T; D-S; E-R |
| D. | A-Q; B-P; C-T; D-R; E-S |
| Answer» E. | |
| 141. |
When a stone tied to a string is whirled in a circle, the work done on it by the string is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | undefined |
| Answer» D. undefined | |
| 142. |
How much time will it take to perform 440 J of work at a rate of 11 W? |
| A. | 50 s |
| B. | 40 s |
| C. | 30 s |
| D. | 20 s |
| Answer» C. 30 s | |
| 143. |
In case of negative work the angle between the force and displacement is |
| A. | \[0{}^\circ \] |
| B. | \[45{}^\circ \] |
| C. | \[90{}^\circ \] |
| D. | \[180{}^\circ \] |
| Answer» E. | |
| 144. |
If velocity of a body is twice of previous velocity, then kinetic energy will become [NDA] |
| A. | 2 times |
| B. | 1/2 times |
| C. | 4 times |
| D. | 1 times |
| Answer» D. 1 times | |
| 145. |
The potential energy is always the same for an object with the same |
| A. | Velocity |
| B. | Speed |
| C. | Acceleration |
| D. | Position |
| Answer» E. | |
| 146. |
The sum of the change in kinetic and potential energy is always [SSC CGL] |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | None of the above |
| Answer» B. Positive | |
| 147. |
When an incandescent electric bulb glows [CDS] |
| A. | the electric energy is completely converted into light |
| B. | the electric energy is partly converted into light energy and partly into heat energy |
| C. | the light energy is converted into electric energy |
| D. | the electric energy is converted into magnetic energy |
| Answer» C. the light energy is converted into electric energy | |
| 148. |
The work done becomes zero if |
| A. | force perpendicular to the displacement |
| B. | displacement is zero |
| C. | force acting on the body is zero |
| D. | All of the above |
| Answer» E. | |
| 149. |
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] |
| Answer» D. of the combined effect of all the three factors stated in [a], [b] and [c] | |
| 150. |
Thomas and Mary are playing carom board. They arrange the seeds in the vertical order. Thomas strikes on the seeds with the striker, with a great speed. He finds that, the stakes do not fall down. On the other hand, when he strikes the seeds with less speed, all the seeds of the stakes fell down. Which property of force this shows? |
| A. | Newton's third law |
| B. | Motion |
| C. | Inertia |
| D. | Reaction of force |
| Answer» D. Reaction of force | |