MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
In which of the following devices can light energy be converted into heat energy?
Think it through first, then pick an option.
- a generator
- b microwave oven
- c photographic film
- d thermocouple
Answer and explanation
Correct answer: b microwave oven
The book says a microwave oven turns electromagnetic waves (light is one kind) into heat. A generator turns mechanical energy into electricity, photographic film turns light into chemical energy, and a thermocouple turns heat into electricity.
Why the other options are wrong
- a generator: This is not the answer: The book says a microwave oven turns electromagnetic waves (light is one kind) into heat. A generator turns mechanical energy into electricity, photographic film turns light into chemical energy, and a thermocouple turns heat into electricity.
- c photographic film: This is not the answer: The book says a microwave oven turns electromagnetic waves (light is one kind) into heat. A generator turns mechanical energy into electricity, photographic film turns light into chemical energy, and a thermocouple turns heat into electricity.
- d thermocouple: This is not the answer: The book says a microwave oven turns electromagnetic waves (light is one kind) into heat. A generator turns mechanical energy into electricity, photographic film turns light into chemical energy, and a thermocouple turns heat into electricity.
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