18. What is the direction of heat transfer?

A. from hot to cold
B. from cold to hot
C. from bottom to top
D. from side to side

19. How is heat transferred in solid materials?

A. thought radiation
B. convection
C. conduction
D. vacuum

22. What do you call the transfer of heat through air?

A. convection
B. radiation
C. conduction
D. roasting

23. How do sound travels through air?

A. very fast
B. very slowly
C. in jumping motion
D. fast in random manner

24. How do the vibrations of the particles bahave when sound travels through solids?

A. occurs fast
B. occures moderately
C. occurs very slowly
D. cannot be determined

25. In which medium can sound wave travel faster?

A. solids
B. liquids
C. gases
D. all of these

26. What affects the speed of sound as it travels?

A. person receiving it
B. the nature of material
C. origin of the sound
D. loudness of the sound

27. Which of the following statements about sound is correct?

A. sound cannot travel through a solid
B. sound travel faster in solids than in air
C. sound travel faster in air than in liquids
D. the travel of the sound is not affected by the medium

28. The bending of light from one kind of material to another material.

A. reflection
B. reflaction
C. light
D. prism

29. When light bounces off in an object.

A. reflection
B. refraction
C. light
D. prism​