1. _______ have the highest calorific value.   Carbohydrates   Sugars   Vitamins   Proteins   Fats   Hint Half-n-half Clue   2. Given that 1 cal (about 4.2 J) of heat is required to raise the temperature of 1 g of water by 1oC, how much heat is required to raise the temperature of 3 g of water by 7oC?   12.6 J   29.4 J   21.0 J   88.2 J   Half-n-half Clue   3. Given that 1 cal (about 4.2 J) of heat is required to raise the temperature of 1 g of water by 1oC, what will be the final temperature when 30.0 calories of heat are added to 4 g of water at 24oC ?   22.2oC   16.5oC   31.5oC   25.8oC   Half-n-half Clue   4. 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   392 J   27440 J   Half-n-half Clue   5. The increase in the area of a solid on heating is called   linear expansion   cubical expansion   superficial expansion   Half-n-half Clue   6. The heat supplied by a bunsen-burner flame on burning 4 m3 of gas which has a calorific value of 25000 J/m3 is   6.2 kJ   6250.0 kJ   100000kJ   100.0 kJ   Half-n-half Clue   7. Heat is a form of _______.   energy   electricity   expansion   Half-n-half Clue