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7. Why is sound energy used for taking images of babies inside the womb?
A. Sound is less harmful among others forms of energy.
B. Light energy will not pass through the mother’s skin and flesh.
C. The babies inside the womb can already hear sounds but cannot see yet.
D. Sound can be transmitted safely through human tissues and fluids and can be reflected back to be used for imaging.
8. Which of the following shows that chemical energy is changed to mechanical energy?
A. lighting of candle
B. switching on of a flashlight
C. using sunlight to dry up clothes
D. an athlete run after drinking water
9. Which best describes the energy transformation in the picture below?
A. Light energy is being transformed to heat energy.
B. Mechanical energy is being transformed into electrical energy.
C. Electrical energy is being transformed into light energy and heat energy.
D. Electrical energy is being transformed into heat energy and mechanical energy.
10. Heat energy has many uses. Which of the following is NOT a use ofthermal energy?
A. Thermal energy is used to cook food.
B. Thermal energy generates electricity.
C. Thermal energy is used for communication.
D. Thermal energy is used to warm the surroundings.
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