61. A transformer is used
for converting AC into DC
for converting DC into AC
to step up DC voltages
to step up or step down AC voltages
62. Match the columns with Lists I and II and select the correct answer with the help of the codes given below: List–I List–II A. High velocity 1. Mach B. Wavelength 2. Angstrom C. Pressure 3. Pascal D. Energy 4. Joule Codes: A B C D
2 1 3 4
1 2 4 3
1 2 3 4
2 1 4 3
63. The most commonly used substances in fluorescent tubes are
sodium oxide and argon
sodium vapour and neon
mercury vapour and argon
mercuric oxide and neon
64. When a body is taken from the earth to the moon,
its weight increases
its weight decreases
its weight remains unchanged
it becomes completely weightless
65. Expansion during heating
occurs only in a solid
increases the weight of the material
decreases the density of the material
occurs at the same rate for all liquids and solids
66. It is more comfortable to wear white clothes in summer because
they reflect all the heat falling on them
they radiate heat transferred from the body
they absorb perspiration
they are soothing to the eyes
67. The first computer was made by
Bill Gates
Bill Clinton
Charles Babbage
Marconi
68. Assertion (A): The danger signal is made up of red colour. Reason (R): Red colour is scattered the least. Select the correct answer using the codes given below:
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
69. In automatic wrist watches, energy is provided by
manual binding
battery
liquid crystal
different movements of our hand
70. Sodium Vapour Lamp is usually used as a street light because
it is cheap
light from it is monochromatic and will not split through water droplets
it is pleasing to the eyes
it is brightly illuminating
71. In a three-pin electrical plug, the longest pin should be connected to
ground terminal
live terminal
neutral terminal
any terminal
72. Thermostat is a device which
measures heat
measures temperature
automatically regulates the temperature of a system
automatically regulates the pressure of a system
73. Which of the following statements is not true?
Air-conditioner and air-cooler both maintain temperature.
Air-conditioner and air-cooler both maintain humidity.
Air-conditioner maintains humidity but air-cooler does not maintain humidity.
Both control the motion of air.
74. Electric motors operating at low voltages tend to burn out because
they draw more current which is inversely proportional to the voltage
they draw more current which is inversely proportional to the square root of the voltage
they draw heat proportional to V2
low voltage sets in electrical discharge
75. If the doors of a refrigerator are left open for a few hours, the room temperature
will decrease
will increase
will remain the same
will decrease only in the area in the vicinity of the refrigerator
76. In which of the following conditions wet clothes will dry earliest?
100% RH, 60°C temperature
100% RH, 20°C temperature
20% RH, 20°C temperature
20% RH, 60°C temperature
77. Given below are two statements: Assertion (A): Lighting a candle in space does not produce a flame. Reason (R): A flame exists due to the pull of gravity. In the context of the above, which one of the following is correct?
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
78. The thermometer suitable to measure 2000°C is
gas thermometer
mercury thermometer
total radiation pyrometer
vapour pressure thermometer
79. While lifting a bucket of water from a well, we feel that the bucket
becomes heavier above the surface of water.
becomes lighter above the surface of water.
loses stability on coming out of water.
has gained mass on coming out of water.
80. When soggy biscuits are kept inside the fridge for some time, they become crisp because
Cooling releases extra moisture.
Humidity inside the fridge is low and extra moisture is absorbed.
Humidity inside the fridge is high and extra moisture is absorbed.
Pressure inside the fridge is high and helps in releasing extra moisture.
12 Total Test
360 Total Question
Scientifically designed for PCS
A must have for Civil services aspirant
IAS PCS SCC and others
75 Total Test
2250 Total Question
Scientifically designed for PCS
A must have for Civil services aspirant
IAS PCS SCC and others
69 Total Test
2070 Total Question
Scientifically designed for PCS
A must have for Civil services aspirant
Timer for time management
