Plane mirror is used as looking glass mirror.
8. Light is a chemical combination of colours.
9. Image formed in a periscope are laterally inverted.
10. We prefer wearing dark clothes in summer.
11. Water is a better thermometric liquid.
12. Black surfaces are poor reflectors of heat.
13. Fire is a form of combustion.
14. Air is a good conductor of heat.
15. Land breeze is formed during the day.
16. Radiation cannot take place in vacuum.
17. Wood is an insulator.
18. Conduction is the fastest process of transfer of heat.
19. Sound can travel in space.
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Answer:
7. True
8. True
9. False
10. False
11. False
12. True
13. True
14. False
15. False
16. False
17. True
18. False
19. False
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