41. An air bubble inside the water behaves as a
bifocal lens
convergent lens
divergent lens
cylindrical lens
42. Sound waves
can travel in a vacuum
can travel in solids
can travel only in gases
can travel both in solid and gaseous mediums
43. In an electric apparatus, ‘earth’ is used
to reduce the expenditure
because the apparatus uses 3-phase
for safety
in the form of fuse
44. Which kind of light waves are used in remote control of television?
Visible light
Infrared
X-rays
Y-rays
45. In Celsius and Fahrenheit thermometers, the two show equal readings of temperature at:
-40°
0°
32°
100°
46. Match List–I with List–II and select the correct answer from the codes given below: List–I List–II (Physical Quantities) (Units) A. Acceleration 1. Joule B. Force 2. Newton-second C. Work done 3. Newton D. Impulse 4. Metre/Second2 Code: A B C D
1 2 3 4
2 3 4 1
3 4 1 2
4 3 1 2
47. Match List–I with List–II and select the correct answer from the code given below: List–I List–II (Appliance/Instrument) (Measured quantity) A. Ammeter 1. Pressure B. Hygrometer 2. Weight C. Barometer 3. Current D. Spring balance 4. Relative humidity Codes: A B C D
2 3 4 1
3 4 1 2
4 1 2 3
1 2 3 4
48. SONAR is mostly used by:
Astronauts
Doctors
Engineers
Navigators
49. The raindrops are spherical because
they fall from big height
the air has resistance
the water has surface tension
none of the above
50. The filament of an electric bulb is made up of
Magnesium
Iron
Nichrome
Tungsten
51. Wilhelm Roentgen invented the
Radio
X-ray Machine
Electric Bulb
Electric Motor
52. Match List–I with List–II and select the correct answer from the codes given below the lists: List–I List–II (Physical quantities) (Units) A. Acceleration 1. Joule B. Force 2. Newton-second C. Work done 3. Newton D. Impulse 4. Metre/second2 Codes: A B C D
1 2 3 4
2 1 4 3
4 3 1 2
3 4 2 1
53. Which one of the following statements is not true about cosmic rays?
They are electromagnetic waves.
They have very short wavelength.
They are made of highly energetic charged particles.
They originate from the Sun.
54. Solder is an alloy of
tin and lead
tin and copper
tin, copper and zinc
tin, lead and zinc
55. The colour of the Star is an indication of its
distance from earth
temperature
luminosity
distance from the sun
56. Which one of the following liquids is a very good conductor of heat?
Mercury
Water
Ether
Benzene
57. In cold weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because
they can breathe in ice
they have enough of accumulated oxygen inside them
their body structure is such that they can survive without oxygen
water has the highest density at 4 ºC; so, underneath the top layer of ice, there is a layer of water
58. An earth satellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by
the rocket engine propelling the satellite
the gravitational attraction of the earth on the satellite
the gravitational attraction of the sun on the satellite
the gravitational attraction of the satellite on the earth
59. Which one of the following pairs is not correctly matched?
Dry ice: solid carbon dioxide
Mustard gas: poisonous liquid used in chemical warfare
Teflon: polymer containing fluorine
Fullerene: organic compounds containing fluorine
60. The energy of the sun is produced by
nuclear fission
ionisation
nuclear fusion
oxidation
12 Total Test
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