Which of the following statements is/are correct about heat? 1. It causes the sensation of hotness and cold ness. 2. When a body is heated, its energy decreases. 3. S.I. unit is Joule. Choose the correct option from the codes given below :

Options

A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1,2 and 3

Answer

c

Explanation

Heat is a form of energy which causes the sensa-tion of hotness and coldness. When a body is heated, its energy increases and when it is cooled, its energy decreases. Heat is measured by change in the degree of hotness and coldness it produces in material bodies. The non S.I. units are calorie and kilocalorie. The S.I unit is Joule.