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921. A heater of 400 watt was on for 5 hours. Calculate electric energy consumed by heater?



922. Kilowatt-hour is unit of:



923. An electric motor of power 2hp is installed in an industrial unit. Its power is:



924. Power is dot product of:



925. What is the power of electric motor when it performs work of 64 × 10⁶J in 8 seconds?



926. Four bulbs of 100W each, two bulbs of 100W, each works for 2 hours daily. The energy consumed in 30 days will be:



927. 2 kilowatt-hour is equal to:



928. A stone of mass 2kg is dropped from rest 5m above ground. What is its velocity at height of 3m?



929. Two bodies with kinetic energies in 4:1 ratio and equal momenta. Ratio of their masses is:



930. Which of the following is a non-conservative force?



931. If mass and speed of object double, kinetic energy becomes:



932. A car of mass 800Kg accelerates from 20 to 30ms⁻¹. Increase in K.E is:



933. Kilowatt hour is a unit of:



934. According to work-energy principle in linear motion, work done =



935. If mass 'm' accelerated on smooth horizontal surface 'S' by force 'F', work F×S is converted into:



936. One Megawatt hour equals:



937. One of the following is a non-conservative force:



938. The equation for kinetic energy is:



939. The unit of kinetic energy is same as that of:



940. A man in elevator on 3rd floor. What mainly determines his kinetic energy?



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