1. A mass of 50 kg falls 100m. If all its potential energy is converted to heat and gravitational acceleration = 9.8 m/s2, then the heat gained is   490 J   980 J   49000 J   5000 J   Hint Half-n-half Clue   2. Heat is a form of _______.   expansion   electricity   energy   Half-n-half Clue   3. The calorific value of a fuel is the quantity of heat produced when a unit _______ of it is burnt.   weight   volume   mass   Half-n-half Clue   4. Heat energy travels through _______ by conduction only.   liquids   solids   gases   Half-n-half Clue   5. _______ have the highest calorific value.   Vitamins   Proteins   Fats   Carbohydrates   Sugars   Half-n-half Clue   6. Water at 35oC is mixed with an equal mass of water at 60oC. If there are no heat losses to the surroundings, then what is the final temperature of the water mixture ?   60oC   35oC   47.5oC   95.0oC   Half-n-half Clue   7. The SI unit of heat (thermal energy) is   Newton   Joule   Watt   Pascal   Half-n-half Clue