1. Heat is a form of _______.   energy   electricity   expansion   Hint Half-n-half Clue   2. _______ have the highest calorific value.   Vitamins   Fats   Proteins   Sugars   Carbohydrates   Half-n-half Clue   3. Liquids exhibit only _______ expansion.   superficial   linear   cubical   Half-n-half Clue   4. The heat supplied by a bunsen-burner flame on burning 5 m3 of gas which has a calorific value of 25000 J/m3 is   125.0 kJ   5.0 kJ   125000kJ   5000.0 kJ   Half-n-half Clue   5. A mass of 40 kg falls 70m. If all its potential energy is converted to heat and gravitational acceleration = 9.8 m/s2, then the heat gained is   2800 J   686 J   27440 J   392 J   Half-n-half Clue   6. Different gases have the same rate of expansion for the same rise in temperature.   True   False   7. Water at 20oC 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 ?   80.0oC   60oC   20oC   40.0oC   Half-n-half Clue