MCQOPTIONS
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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.
| 51. |
Light Emitting Diode (LED) converts [CDS] |
| A. | light energy into electrical energy |
| B. | electrical energy into light energy |
| C. | thermal energy into light energy |
| D. | mechanical energy into electrical energy |
| Answer» C. thermal energy into light energy | |
| 52. |
Which one of the following is correct? [NDA] The wavelength of the X-rays |
| A. | is longer than the wavelength of sound waves |
| B. | is longer than the wavelength of the yellow sodium light |
| C. | is longer than the wavelength of radio waves |
| D. | is of the order of 0.1 nanometer |
| Answer» E. | |
| 53. |
Which of the following statement is/are the applications of photovoltaic cells? A. They are used to detect opacity of solids, defects materials. B. They are used to switch on and off the street automatically C. They are used to compare illuminating power of two sources. D. To control temperature in furnaces and chemical reactions |
| A. | B and C |
| B. | B, C, D |
| C. | A, B, C |
| D. | All of these |
| Answer» E. | |
| 54. |
Which among the following statements are the requirements of good source of energy? A. It should do a large amount of work per unit volume or mass. B. It should be easily accessible. C. It should be easy to store and transport. D. It should be economical. |
| A. | A, B |
| B. | A, B, C |
| C. | B, C, D |
| D. | All of these generator. |
| Answer» E. | |
| 55. |
Which of the following does NOT allow harmful ultraviolet radiations from the sun to reach the earth? |
| A. | \[{{O}_{2}}\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[{{O}_{3}}\] |
| Answer» E. | |
| 56. |
The phenomenon of high and low tides and the difference in sea levels give __________. |
| A. | Hydel energy |
| B. | Tidal energy |
| C. | Wave energy |
| D. | Thermal energy |
| Answer» C. Wave energy | |
| 57. |
A perfect black body has the unique characteristic feature as [CDS] |
| A. | a good absorber only |
| B. | a good radiator only |
| C. | a good absorber and a good radiator |
| D. | neither a radiator nor an absorber |
| Answer» D. neither a radiator nor an absorber | |
| 58. |
Which part of the solar cooker is responsible for greenhouse effect? |
| A. | Coating with black colour inside the box |
| B. | Mirror |
| C. | Glass sheet |
| D. | Outer cover of the solar cooker |
| Answer» D. Outer cover of the solar cooker | |
| 59. |
In a hydro power plant |
| A. | potential energy possessed by stored water is converted into electricity |
| B. | kinetic energy possessed by stored water is converted into potential energy |
| C. | electricity is extracted from water |
| D. | water is converted into steam to produce electricity |
| Answer» B. kinetic energy possessed by stored water is converted into potential energy | |
| 60. |
If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be [NDA] |
| A. | circular |
| B. | parabolic |
| C. | elliptical |
| D. | a straight line |
| Answer» B. parabolic | |
| 61. |
Which one among the following radiations carries maximum energy? [NDA] |
| A. | Ultraviolet rays |
| B. | Gamma-rays |
| C. | X-rays |
| D. | Infra-red rays |
| Answer» C. X-rays | |
| 62. |
The most familiar form of radiant energy in sunlight that causes tanning and sun burning of human skin, is called [CDS] |
| A. | ultraviolet radiation |
| B. | visible radiation |
| C. | infrared radiation |
| D. | microwave radiation |
| Answer» B. visible radiation | |
| 63. |
Which one of the following is the correct sequence of the wavelengths of radiations? [NDA] |
| A. | UV > Green> IR > Hard X-rays |
| B. | IR > Green> UV > Hard X-rays |
| C. | UV > Hard X-rays> IR > Green |
| D. | IR > Hard X-rays> Green> UV |
| Answer» C. UV > Hard X-rays> IR > Green | |
| 64. |
Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas? |
| A. | It's safer |
| B. | It's portable |
| C. | It's cleaner |
| D. | It's cheaper |
| Answer» C. It's cleaner | |
| 65. |
_____ is used as a fuel in space ships. |
| A. | Hydrogen |
| B. | Alcohol |
| C. | Petrol |
| D. | Diesel |
| Answer» B. Alcohol | |
| 66. |
The main constituent of biogas is |
| A. | methane |
| B. | carbon dioxide |
| C. | hydrogen |
| D. | hydrogen sulphide |
| Answer» B. carbon dioxide | |
| 67. |
A moderator is used in nuclear reactors in order to |
| A. | slow down the speed of the neutrons |
| B. | accelerate the neutrons |
| C. | increase the number of neutrons |
| D. | decrease the number of neutrons |
| Answer» D. decrease the number of neutrons | |
| 68. |
The transistor are usually made of [CDS] |
| A. | metal oxides with high temperature coefficient of resistivity |
| B. | metals with high temperature coefficient of resistivity |
| C. | metals with low temperature coefficient of resistivity |
| D. | semiconducting materials having low temperature coefficient of resistivity |
| Answer» B. metals with high temperature coefficient of resistivity | |
| 69. |
Repeaters used in telephone links are: [NDA] |
| A. | Rectifiers |
| B. | Oscillators |
| C. | Amplifiers |
| D. | Transformers |
| Answer» D. Transformers | |
| 70. |
Electromagnetic radiations are emitted by which of the following? [NDA] |
| A. | Only by radio and television transmitting antennas |
| B. | Only by bodies at temperature higher than their surroundings |
| C. | Only by red-hot bodies |
| D. | By all bodies |
| Answer» E. | |
| 71. |
The waves used in telecommunication are [SSC] |
| A. | IR |
| B. | UV |
| C. | Microwave |
| D. | Cosmic rays |
| Answer» D. Cosmic rays | |
| 72. |
The active component in an IC are |
| A. | Resistors |
| B. | Capacitors |
| C. | Transistors and diodes |
| D. | None of these |
| Answer» D. None of these | |
| 73. |
Which of the following statements is/are correct? I. Pure Si doped with trivalent impurities gives a p-type semiconductor II. Majority carriers in a n-type semiconductor are holes III. Minority carriers in a p-type semiconductor are electrons IV. The resistance of intrinsic semiconductor decreases with increase of temperature |
| A. | I only |
| B. | I, III and IV |
| C. | I and IV |
| D. | II only |
| Answer» C. I and IV | |
| 74. |
Column-I Column-II[A]Hydrogen bomb(1)Fission[B]Atom bomb (2)Fusion[C]Binding energy (3)Critical mass[D]Nuclear reactor (4)Mass defect |
| A. | [A] \[\to \] (3); [B] \[\to \] (2); [C] \[\to \] (1); [D] \[\to \] (4) |
| B. | [A] \[\to \] (2); [B] \[\to \] (1); [C] \[\to \] (4); [D] \[\to \] (3) |
| C. | [A] \[\to \] (3); [B] \[\to \] (1); [C] \[\to \] (2); [D] \[\to \] (4) |
| D. | [A] \[\to \] (4); [B] \[\to \] (2); [C] \[\to \] (3); [D] \[\to \] (1) |
| Answer» C. [A] \[\to \] (3); [B] \[\to \] (1); [C] \[\to \] (2); [D] \[\to \] (4) | |
| 75. |
Telephony is an example of _____ mode of communication |
| A. | point-to-point |
| B. | broad cast |
| C. | both [a] and [b] |
| D. | None of these |
| Answer» B. broad cast | |
| 76. |
At absolute zero, Si acts as |
| A. | non-metal |
| B. | metal |
| C. | insulator |
| D. | None of these |
| Answer» D. None of these | |
| 77. |
Which of the following cannot be fabricated on an IC? [CDS] |
| A. | Transistors |
| B. | Inductors and transformers |
| C. | Diodes |
| D. | Resistors |
| Answer» C. Diodes | |
| 78. |
Match the Column I and Column II. Column -1 Column - II[A]Isotopes(1)Mass number same but different atomic number[B]Isobars(2)Atomic number same but different mass number.[C]Isotones(3)Number of neutrons plus number of protons[D]Nucleons(4)Number of neutrons same but different atomic number |
| A. | [A] \[\to \] (3); [B] \[\to \] (1); [C] \[\to \] (2); [D] \[\to \] (4) |
| B. | [A] \[\to \] (2); [B] \[\to \] (1); [C] \[\to \] (4); [D] \[\to \] (3) |
| C. | [A] \[\to \] (1); [B] \[\to \] (2); [C] \[\to \] (3); [D] \[\to \] (4) |
| D. | [A] \[\to \] (1); [B] \[\to \] (3); [C] \[\to \] (2); [D] \[\to \] (4) |
| Answer» C. [A] \[\to \] (1); [B] \[\to \] (2); [C] \[\to \] (3); [D] \[\to \] (4) | |
| 79. |
The neutron, proton, electron and alpha particle are moving with equal kinetic energies. How can the particles be arranged in the increasing order of their velocities? [NDA] |
| A. | alpha particle-neutron-proton- electron |
| B. | proton-electron-neutron-alpha particle |
| C. | electron-proton-neutron-alpha particle |
| D. | neutron-proton-electron-alpha particle |
| Answer» B. proton-electron-neutron-alpha particle | |
| 80. |
Consider the following statements: [IAS Prelim] At the present level of technology available in India, solar energy can be conveniently used to: 1. Supply hot water to residential buildings. 2. Supply water for minor irrigation projects. 3. Provide street lighting. 4. Electrify a cluster of villages and small towns. |
| A. | 1, 2, 3 and 4 are correct |
| B. | 2 and 4 are correct |
| C. | 1 and 3 are correct |
| D. | 1, 2 and 3 are correct |
| Answer» B. 2 and 4 are correct | |
| 81. |
Chadwick was awarded the 1935 Nobel prize in physics for his discovery of the |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | positron |
| Answer» D. positron | |
| 82. |
One micron equals to |
| A. | \[{{10}^{-3}}m\] |
| B. | \[{{10}^{-9}}m\] |
| C. | \[{{10}^{-6}}m\] |
| D. | \[{{10}^{-2}}m\] |
| Answer» D. \[{{10}^{-2}}m\] | |
| 83. |
Light year is [SSC CGL] |
| A. | light emitted by the sun in one year |
| B. | time taken by light to travel from sun to earth |
| C. | the distance travelled by light in free space in one year |
| D. | time taken by earth to go once around the sun |
| Answer» D. time taken by earth to go once around the sun | |
| 84. |
In SI units the number of basic physical quantities are |
| A. | 3 |
| B. | 7 |
| C. | 9 |
| D. | 21 |
| Answer» C. 9 | |
| 85. |
In the system shown, the masses are released from rest. What shall be the acceleration of the moving masses? [NDA] |
| A. | g |
| B. | 2g/3 |
| C. | g/3 |
| D. | g/2 |
| Answer» D. g/2 | |
| 86. |
A swinging pendulum has its maximum acceleration at [NDA] |
| A. | the bottom of the swing |
| B. | the two extremities of the swing |
| C. | every point on the swing |
| D. | no particular portion of the pendulum |
| Answer» C. every point on the swing | |
| 87. |
A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is [NDA] |
| A. | zero |
| B. | towards the centre of circle |
| C. | away from the centre along the radius of the circle |
| D. | perpendicular to the radius and along the velocity |
| Answer» C. away from the centre along the radius of the circle | |
| 88. |
The displacement of a particle at time t is given by \[\vec{x}=a\hat{i}+bt\hat{j}+\frac{c}{2}{{t}^{2}}\hat{k}\] where a, b and c are positive constants. Then the particle is [NDA] |
| A. | accelerated along \[\frac{18}{5}\] direction |
| B. | decelerated along \[\frac{18}{5}\] direction |
| C. | decelerated along \[\hat{j}\] direction |
| D. | accelerated along \[\hat{j}\] direction |
| Answer» B. decelerated along \[\frac{18}{5}\] direction | |
| 89. |
If d denotes the distance covered by a car in time t and \[\vec{S}\] denotes the displacement by the car during the same time, then: [NDA] |
| A. | \[d\le \left| {\vec{S}} \right|\] |
| B. | \[d=\left| {\vec{S}} \right|\] only |
| C. | \[d\ge \left| {\vec{S}} \right|\] |
| D. | \[d\prec \left| {\vec{S}} \right|\] |
| Answer» D. \[d\prec \left| {\vec{S}} \right|\] | |
| 90. |
Which of the following is not a fundamental unit? |
| A. | newton |
| B. | kilogram |
| C. | metre |
| D. | second |
| Answer» B. kilogram | |
| 91. |
A spherical body moves with a uniform angular velocity (\[\omega \]) around a circular path of radius r. Which one of the following statements is correct? [IAS Prelim] |
| A. | The body has no acceleration |
| B. | The body has a radial acceleration \[{{\omega }^{2}}r\] directed toward centre of path |
| C. | The body has a radial acceleration 2/52/5\[{{\omega }^{2}}r\] directed away from the centre of the path |
| D. | The body has an acceleration \[{{\omega }^{2}}r\] tangential to its path |
| Answer» C. The body has a radial acceleration 2/52/5\[{{\omega }^{2}}r\] directed away from the centre of the path | |
| 92. |
Which one of the following characteristics of the particle does the shaded area of the velocity-time graph shown represent? [NDA] |
| A. | Momentum |
| B. | Acceleration |
| C. | Distance covered |
| D. | speed |
| Answer» D. speed | |
| 93. |
A stone is thrown vertically upwards with an initial velocity u from the top of a tower of height \[\frac{12{{u}^{2}}}{g}\]. With what velocity does the stone reach the ground? [NDA] |
| A. | u |
| B. | 4u |
| C. | 5u |
| D. | \[2\sqrt{6}u\] |
| Answer» D. \[2\sqrt{6}u\] | |
| 94. |
Which one of the following remains constant while throwing a ball upward? [NDA] |
| A. | Displacement |
| B. | Kinetic energy |
| C. | Acceleration |
| D. | Velocity |
| Answer» D. Velocity | |
| 95. |
If an object undergoes a uniform circular motion, then its [NDA] |
| A. | acceleration remains uniform |
| B. | velocity changes |
| C. | speed changes |
| D. | velocity remains uniform |
| Answer» C. speed changes | |
| 96. |
An iron ball and a wooden ball of same radius are released from a height 'h' in vacuum. Which of the two balls would take more time to reach the ground? |
| A. | Iron ball |
| B. | Both would take same time |
| C. | Wooden ball |
| D. | None of these |
| Answer» C. Wooden ball | |
| 97. |
The numerical ratio of displacement to the distance covered is always. |
| A. | less than one |
| B. | equal to one |
| C. | equal to or less than one |
| D. | equal to or greater than one |
| Answer» D. equal to or greater than one | |
| 98. |
Among the following the derived quantity is |
| A. | mass |
| B. | length |
| C. | density |
| D. | time |
| Answer» D. time | |
| 99. |
Mass is the measure of |
| A. | matter contained |
| B. | weight |
| C. | force |
| D. | none of these |
| Answer» B. weight | |
| 100. |
Assertion: Density is a derived physical quantity. Reason: Density cannot be derived from the fundamental physical quantities. |
| 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» D. If Assertion is incorrect but Reason is correct. | |