1.Amount of heat required to raise the temperature of 1 g of water from 14.5 to 15.5 degree centigrade is: 1. 1 Joule
2. 1 Calorie
3. 4.2 Calorie
4. none of the above

  4. none of the above

Explanation:

A "15 °C calorie" (with a lower-case 'c') is defined as the amount of energy required to raise 1 gram of water from 14.5 °C to 15.5 °C at standard atmospheric pressure. That definition is one of at least 7 different definitions of the "gram calorie".

A Calorie (with an upper-case 'C') is 1000 calories. So the choice "1 Calorie" is attractive, but incorrect. It is 1000 times the amount of heat described.

none of the Joule or Calorie choices is correct