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1. Which energy transformation occurs in an electric iron?
A. heat to light
C. heat to electricity
B. light to heat
electricity to heat
2. Which of the following is NOT the use of sound energy?
A. Sound is used to map ocean floor. C. sound is used to generate electricity.
B. Sound helps track earthquake.
D sound is used to see internal organs.
3. Which of the following statements is true?
A Friction makes an object slide.
C. Force is needed to stop an object.
B. Gravity pushes object upward.
D. An object in motion will remain in motion.
4. Mother placed a thick curtain on the window during summer to minimize the entrance of heat. Which
type of heat transfer did she consider?
A. conduction
C. forced convection
radiation
D. natural convection
5. Which of the following objects can reduce friction?
A. alcohol
C. rocks
B. oil
D. salt
6. What kind of force does the ground exert against your feet?
A. gravity
C. mass
B. friction
D. contact
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