1. Heat energy travels through _______ by conduction only.   solids   liquids   gases   Hint Half-n-half Clue   2. Heat is a form of _______.   expansion   electricity   energy   Half-n-half Clue   3. The heat supplied by a bunsen-burner flame on burning 2 m3 of gas which has a calorific value of 25000 J/m3 is   50.0 kJ   50000kJ   12.5 kJ   12500.0 kJ   Half-n-half Clue   4. A mass of 50 kg falls 60m. If all its potential energy is converted to heat and gravitational acceleration = 9.8 m/s2, then the heat gained is   588 J   29400 J   3000 J   490 J   Half-n-half Clue   5. Liquids exhibit only _______ expansion.   linear   cubical   superficial   Half-n-half Clue   6. The heat produced on burning 3 kg of fuel oil which has a calorific value of 39800 kJ/kg is   13.3 MJ   119.4 MJ   119400 MJ   13266.7 MJ   Half-n-half Clue   7. The SI unit of heat (thermal energy) is   Watt   Pascal   Joule   Newton   Half-n-half Clue