MCQOPTIONS
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MCQOPTIONS
This section includes 73 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to |
| A. | the heating effect of current alone |
| B. | hysteresis loss alone |
| C. | both the heating effect of current and hysteresis loss |
| D. | intense sunlight at noon |
| Answer» D. intense sunlight at noon | |
| 52. |
Nuclear sizes are expressed in a unit named |
| A. | Fermi |
| B. | angstrom |
| C. | newton |
| D. | tesla |
| Answer» B. angstrom | |
| 53. |
Identify the vector quantity from the following |
| A. | Heat |
| B. | Angular momentum |
| C. | Time |
| D. | Work |
| Answer» C. Time | |
| 54. |
Large astronomical telescopes always use as objective |
| A. | lens |
| B. | mirror |
| C. | combinations of lenses |
| D. | None of the above |
| Answer» D. None of the above | |
| 55. |
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? DiffusionRefractionInternal reflection |
| A. | I, II and III |
| B. | I and II |
| C. | II and III |
| D. | I and III |
| Answer» D. I and III | |
| 56. |
Natural radioactivity was discovered by |
| A. | Marie Curie |
| B. | Ernest Rutherfor |
| C. | Henri Becquerel |
| D. | Enrico Fermi |
| Answer» D. Enrico Fermi | |
| 57. |
Planets are |
| A. | luminous heavenly bodies revolving around a star |
| B. | non-luminous heavenly bodies |
| C. | luminous heavenly bodies that twinkle |
| D. | luminous heavenly bodies that do not twinkle |
| Answer» C. luminous heavenly bodies that twinkle | |
| 58. |
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from |
| A. | east |
| B. | west |
| C. | northeast |
| D. | southeast |
| Answer» B. west | |
| 59. |
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is |
| A. | 1200 m |
| B. | 0.33 km |
| C. | 3.33 km |
| D. | 33 km |
| Answer» D. 33 km | |
| 60. |
Mica is used in electrical appliances such as electric iron because mica is |
| A. | a good conductor of heat but a bad conductor of electricity |
| B. | a bad conductor of heat but a good conductor of electricity |
| C. | a good conductor of heat as well as electricity |
| D. | a bad conductor of heat as well as electricity |
| Answer» B. a bad conductor of heat but a good conductor of electricity | |
| 61. |
It is easier to roll a barrel full of coal tar than to pull it because |
| A. | the full weight of the barrel comes into play when it is pulled |
| B. | the rolling friction is much less than the sliding friction |
| C. | more surface area of the barrel is in contact with the road when it is pulled |
| D. | coal tar is a liquid and it flows in the barrel when it is rolled |
| Answer» C. more surface area of the barrel is in contact with the road when it is pulled | |
| 62. |
One should not connect a number of electrical appliances to the same power socket because |
| A. | this can damage the appliances due to overloading |
| B. | this can damage the domestic wiring due to overloading |
| C. | this can damage the electrical meter |
| D. | the appliance will not get full voltage |
| Answer» C. this can damage the electrical meter | |
| 63. |
Minimum number of unequal vectors which can give zero resultant are |
| A. | two |
| B. | three |
| C. | four |
| D. | more than four |
| Answer» C. four | |
| 64. |
Intensity of sound has |
| A. | an object existence |
| B. | a subject existence |
| C. | no existence |
| D. | both subjective and objective existence |
| Answer» B. a subject existence | |
| 65. |
It is easier to roll a stone up a sloping road than to lift it vertical upwards because |
| A. | work done in rolling is more than in lifting |
| B. | work done in lifting the stone is equal to rolling it |
| C. | work done in both is same but the rate of doing work is less in rolling |
| D. | work done in rolling a stone is less than in lifting it |
| Answer» E. | |
| 66. |
Siphon will fail to work if |
| A. | the densities of the liquid in the two vessels are equal |
| B. | the level of the liquid in the two vessels are at the same height |
| C. | both its limbs are of unequal length |
| D. | the temperature of the liquids in the two vessels are the same |
| Answer» C. both its limbs are of unequal length | |
| 67. |
The absorption of ink by blotting paper involves |
| A. | viscosity of ink |
| B. | capillary action phenomenon |
| C. | diffusion of ink through the blotting |
| D. | siphon action |
| Answer» C. diffusion of ink through the blotting | |
| 68. |
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in |
| A. | 4.2 seconds |
| B. | 42 seconds |
| C. | 4.2 years |
| D. | 42 years |
| Answer» D. 42 years | |
| 69. |
Lux is the SI unit of |
| A. | intensity of illumination |
| B. | luminous efficiency |
| C. | luminous flux |
| D. | luminous intensity |
| Answer» B. luminous efficiency | |
| 70. |
On a stationary sail boat, air is blown from a fan attached to the boat. The boat |
| A. | moves in opposite direction in which the air is blown |
| B. | does not move |
| C. | moves in the same direction in which air blows |
| D. | spins around |
| Answer» C. moves in the same direction in which air blows | |
| 71. |
Radiocarbon is produced in the atmosphere as a result of |
| A. | collision between fast neutrons and nitrogen nuclei present in the atmosphere |
| B. | action of ultraviolet light from the sun on atmospheric oxygen |
| C. | action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere |
| D. | lightning discharge in atmosphere |
| Answer» B. action of ultraviolet light from the sun on atmospheric oxygen | |
| 72. |
oil raise up the wick in a lamp. The principle involves |
| A. | the diffusion of oil through the wick |
| B. | the liquid state of oil |
| C. | capillary action phenomenon |
| D. | volatility of oil |
| Answer» D. volatility of oil | |
| 73. |
Superconductors are substances which |
| A. | conduct electricity at low temperature |
| B. | offer high resistance to the flow of current |
| C. | offer no resistance to the flow of electricity |
| D. | conduct electricity at high temperatures |
| Answer» D. conduct electricity at high temperatures | |