![Mcqmate logo](https://mcqmate.com/public/images/logos/logo-black.png)
![Mcqmate logo](https://mcqmate.com/public/images/logos/logo-white.png)
McqMate
Q. |
How much mechanical work must be done to completely melt 1 gram of ice at 0°C? |
A. | 4.2 J |
B. | 80 J |
C. | 336 J |
D. | 2268 J |
Answer» B. 80 J | |
Explanation: When water at 0 degree Celsius freezes, each gram of water gives off 80 calories. The temperature of the water stays at 0 degree C until every drop has frozen. When ice at 0 degree Celsius melts, it absorbs an equal amount of heat-80 calories for each gram of ice—and its temperature remains unchanged until it has completely melted. |
View all MCQs in
PhysicsNo comments yet