Question

A conversation between two persons is given below:

Person 1: I can’t have this food.

Person 2: But why?

Person 1: Because this food will add 10,000 calories to my body. I will become fatter.

Choose the option which correctly explains what 10,000 calories is.

• A. The food will give person 1, an energy equivalent to the energy required to raise the temperature of 1kg of water by 0.1^oC.
• B. The food will give person 1, an energy equivalent to the energy required to raise the temperature of 1kg of water by 1^oC.
• C. The food will give person 1, an energy equivalent to the energy required to raise the temperature of 1kg of water by 10^oC.
• D. The food will give person 1, an energy equivalent to the energy required to raise the temperature of 1kg of water by 100^oC.

Answer 1

The correct option is C

The food will give person 1, an energy equivalent to the energy required to raise the temperature of 1kg of water by 10^oC.

Definition of calorie is " It is the amount of heat required at a pressure to raise the temperature of 1 gm of water by $1^{\circ }$C" This is 1 calorie and is equal to 4.19 joules.

When person 1 says food will add 10,000 calories, The calculation is:

1 calorie-----1gm water-----$1^{\circ }$ C change
1000 calories-------1 kilo (1000gms) water---- $1^{\circ }$C change
10,000 calories-----1 kilo water-----${10}^{\circ }$C change.