75) How much quantity of heat is needed to change the temperature of 300 gm of copper from 25 degree centigrade to 75 degree centigrade? (Specific heat of copper is 0.092 cal/gm degree centigrade)

76) Mild steel is also known as

77) Calculate the current drawn by a circuit containing five lamps in parallel, each having 6 ohm resistance. Assume the supply to be 28 volts

78) A scooter of mass 120 kg is moving with a uniform velocity of 108 km per hour. The force required to stop the vehicle in 10 seconds is

79) Which is the example of 1st order lever?