Physics
Work and Energy
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#153 When the velocity of a body is doubled
A) Its K.E. is doubled
B) Its P.E. is doubled
C) Its momentum is doubled
D) Its acceleration is doubled
#154 The gravity does no work, when the body moves
A) Horizontally
B) Vertically upward
C) Vertically downward
D) At an angle of 45° with horizontal
#155 Commercial unit of electrical energy is
A) erg-second
B) J/s
C) kWh
D) J-s
#156 One horse power is equal to
A) 746 watts
B) 745 watt
C) 750 watts
D) 775 watt
#157 If mass and speed of a body are halved then its K.E would
A) Reduce by 1/4 times
B) Reduce by 1/8 times
C) Reduce by 1/116161 times
D) Reduce by 1/22 times
#158 How much water a pump of 2 kW can raise in one minute to a height of 10 m (Take g = 10 m/s²)
A) 1000 liters
B) 1200 liters
C) 100 liters
D) 2000 liters
#159 A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with is the direction of motion of body is
A) 0°
B) 30°
C) 60°
D) 90°
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