Page 109 - ScienceStd4

5. Heat travels through solid materials like metal and iron by
_____.

(a) conduction
FOR ONLINE READING ONLY
(b) convection

(c) refraction

(d) radiation

6. The speed of sound energy is slowest in _____.

(a) solids

(b) liquids

(c) air

(d) solids and liquids

7. Energy that can travel from a hot to a cooler place is
called ____.

(a) sound energy

(b) light energy

(c) wind energy

(d) heat energy

Section B: Write TRUE for a correct sentence and FALSE
for an incorrect sentence

8. Radio is a communication device that emits sound energy.

9. Images appear in non-reflective and smooth objects.

10. Sound travels in air, liquids, and solids.

11. Light is refracted as it move from air to water.

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SCIENCE AND TECHNOLOGY STD 4.indd 102