1. When a current is supplied by a battery, _______ energy is converted to electrical energy.   nuclear   chemical   mechanical   Hint Half-n-half Clue   2. Both work and heat are measured in Joules.   True   False   3. The energy acquired by a body because of its motion is called potential energy.   True   False   4. _______ is the capacity to do work.   Energy   Pressure   Force   Half-n-half Clue   5. If there is no friction, the efficiency of a machine can be greater than 100 %.   True   False   6. 'Energy can neither be created nor destroyed' is a statement of the   Law of Conservation of Energy   Law of Conservation of Matter   Law of Conservation of Electric Charges   Half-n-half Clue   7. A body loses 4116 J of potential energy in falling through 60 m. If the gravitational acceleration is 9.8 m s-2, then the body has a mass of   588 kg   69 kg   7 kg   420 kg   Half-n-half Clue