1. What form of energy is transferred between objects of different temperatures?
B. Light
D. Wave
A. Heat
C. Sound
2. What is the function of a heat engine?
A. It converts thermal energy into chemical energy.
B. It converts thermal energy into mechanical energy.
C. It converts mechanical energy into chemical energy.
D. It converts chemical energy into mechanical energy.
3. Why is the heat engine not 100% efficient?
A. Because all mixtures of gases are converted into work.
B. Because an engine needs to be cooled down.
C. All of the gases are used up by the engine.
D. Some of the gases are taken up in the piston.
4. What causes thermal pollution?
A. Exhaust of different vehicles.
B. Exhaust from different industrial engines.
C. Degradation of water.
D. All of them
5. How can an air conditioning unit function as a heater during cold days and as a cooler during hot days?
1. It cools the inside of the house and heats the outside.
2. It takes heat from the air outside to warm the inside.
C. Both 1 and 2
B. 2 only
D. None of them
A. I only
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Answer:
1.A
2.D
3.C
4.A
5.B
Explanation:
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