91 .X- rays are ………. waves.
A.  Longitudinal
B.  Transverse
C.  Electromagnetic
D.  Elastic
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92 .The velocity of sound in moist is more than in dry air because the moist air has
A.  more density than dry has
B.  less density than dry air
C.  more pressure than dry air
D.  less pressure than dry air
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93 .The method of age determination called 'radioactive uranium dating' cannot be used to determine the age of
A.  rocks
B.  fossils and plant bodies
C.  the earth
D.  minerals on earth
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94 .Which of the following is a primary consumer?
A.  Cow
B.  Dog
C.  Hawk
D.  Bear
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95 .SI unit of luninious intensity is:
A.  lumen
B.  lux
C.  candela
D.  watt
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96 .Which one among the following rroups is the most abundant in terms of number os species identified?
A.  Fundgi
B.  Green plants
C.  Bacteria
D.  Insects
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97 .Sound waves are similar to the waves
A.  of laswer light passing through air
B.  generated in a stretched wire by hitting or plucking the wire
C.  generated in a pipe filled with air by moving the piston attached to the pipe up and down
D.  generated by the mobile phone towers
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98 .The image of our face in a plane mirror
A.  real
B.  magnified
C.  diminished
D.  none of these
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99 .Which one of the following phenomena is used in optical fibres?
A.  Scattering
B.  successive reflections
C.  Refraction
D.  total internal reflection
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100 .The shape of a rain drop is spherical due to-
A.  Viscosity
B.  Surface tension
C.  Elasticity
D.  Gravitation
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101 .The value of g on the Earth's surface changes due to
A.  Both rotation and shape of the Earth
B.  Rotation orf the Earth only
C.  Shape of Earth only
D.  None of the above
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102 .The Doppler's effect is applicable for
A.  light wave
B.  sound wave
C.  space wave
D.  both ( a ) and ( b )
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103 .Sound moves with higher velocity if
A.  pressure of the medium is decreased
B.  temperature of the medium inincreased
C.  humidity of the medium
D.  both ( b ) and ( c )
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104 .γ- ray consists of:
A.  Meson particles
B.  Neutrino particles
C.  Higg's boson
D.  Electromagnetic waves
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105 .A reversible and an irreversible engine are working between the same limits of temperature. The efficiency of
A.  the reversible engine is greater that the irreversible engine
B.  each engine is 100%
C.  the two engine are equal
D.  the irreversible engine is greater than the reversible engine
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