61 .The waves used in sonography are -
A.  Micro waves
B.  Infra – red waves
C.  Sound waves
D.  Ultrasonic waves
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62 .If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.  4 : 1
B.  1 : 16
C.  2 : 1
D.  1 : 4
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63 .Which is the fastest mode of heat loss?
A.  Conduction
B.  convection
C.  radiation
D.  all are equally fast
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64 .Biodiversity is richer in:
A.  tropical regions
B.  polar regions
C.  temperate regions
D.  oceans
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65 .If the temperature inside a room is increased, the relative humidity will
A.  increase
B.  decrease
C.  remain unchanged
D.  none of these
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66 .The 'super bug' used in controlling oil pollution is:
A.  An algal starin
B.  A fungal strain
C.  A bacterial strain
D.  A water flea
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67 .A digital signal possesses:
A.  Continuously varying values
B.  only two discrete values
C.  Only four discrete values
D.  None of the above
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68 .Satellite having the same orbital period as the period of rotation of the Earth about its own axis is known as:
A.  Polar satellite
B.  Stationary satellite
C.  Geostationary satellite
D.  INSAT
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69 .The phenomenon of interference is shown by
A.  Longitudinal mechanical wave's only
B.  Transverse mechanical wave's only
C.  Non- mechanical transverse waves only
D.  All the above types of wave
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70 .A geostationary satellite should be launched such that it moves from:
A.  north to south in the polar plane
B.  South to north in the polar plane
C.  East to west in the equatorial plane
D.  West to east in the equatorial plane
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71 .Which famous scientist was the first to look at the night sky throught a telescope?
A.  Comernicus
B.  Newton
C.  Michael Faraday
D.  Galileo
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72 .The ozone layer absorbs
A.  infrared radiation
B.  ultraviolet radiation
C.  X – rays
D.  – y rays
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73 .A plant with green leaves placed in red light will appear
A.  Green
B.  Violet
C.  Red
D.  Blue
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74 .Which of the gas is not known as greenhouse gas?
A.  Methene
B.  Carbon dioxide
C.  Nitrous oxide
D.  Hydrogen
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75 .Which one of the following pairs ofrays is electromagnetic in nature -
A.  β rays and γ rays
B.  cathode rays and X – rays
C.  ß™rays and – β rays
D.  X rays and γ rays
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