113. An oil drop spreads over water because?
A.oil is lighter than water
B.oil is more viscous
C.oil does not mix with water
D.surface tension of oil is much smaller than that of water

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114. The device which converts AC to DC is ?
A.Oscillator
B.Amplifier
C.Rectifier
D.None of these

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115. Knot is a measure of?
A.The speed of ship
B.The curvature of spherical objects
C.Solar radiate
D.Intensity of earthquake shock

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116. When the main switch of the house is put off it disconnects the?
A.live wire only
B.live wire and the earth wire
C.live wire and the neutral wire
D.earth wire and the neutral wire

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117. Heat from the sun reaches earth by the process of
A.Conduction
B.Convection
C.Radiation
D.All of the above

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118. Boyle's law is a relationship between?
A.Pressure and volume
B.Volume and temperature
C.Volume and density
D.Pressure and temperature

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119. Which of the following produces more severe burns?
A.Current
B.voltage
C.resistance
D.All of the above

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