Question

Select the correct option given below:
How much work can be obtained from 100 calories of heat energy?

• A. 100 J
• B. 420 J
• C. 42 J
• D. 4200 J

Answer 1

Answer: (B)

420 J

$1cal=4.2J$

$\because$ Work done = heat obtained in calories $\times 4.2$

or $W=100\times 4.2=420J$