Read the sentences carefully, Choose the letter of the corred answer.
1. What is the direction of heat transfer?
A from hot to cold C. from cold to hot
B. from bottom to top D. from side to side
2. How is heat transferred in solid materials?
A through convection C. through conduction
B. through radiation D. through vacuum
3. What happens to a liquid when heated?
A It remains the same C. It increases in temperature
B. It increases in volume D. It increases its water level
4. What may happen to a solid when it is continuously exposed to heat?
A. it may become heavier C. It may expand
B. it may decrease in volume D. it may melt
5. When heat is transferred in gases. It is called
A convection B. radiation C. conduction D. roasting
6. How do the vibrations of the particles behave when sounds travel through solids?
A. occurs fast C. occurs moderately
B. occurs very slowly D. cannot be determined
7. How do sounds travel through alr?
A. Very fast B. very slowly C. in jumping motion D. In random manner
8. In which medium can sound wave travel faster?
A. Solids B. liquids C. gases D. all of these
9. What affects the speed of sounds as it travels?
A. person receiving it C. the origin of the sound
B. the nature of material D. loudness of the sound
10. Which of the following statements about sounds is correct?
A Sound cannot travel through solids.
B. Sounds travel faster in air than liquids.
C. Sounds travel faster in solids than alr.
D. The travel of sounds is not affected by the medium through which it travels.

2. Heat is transferred in solid materials by conduction for example a metal pot, you use it to cook food because metal absorbs heat and electricity

4. It may melt for example a solid ice, if you let it outside of your house, you will see it melt because of the heat from the sun.

6.It occurs fast because when the molecules touch the heat, it will move slowly then it will bump to other molecules until it moves fast

10. Sound travels faster in air because air molecules are separated, even if liquid is also separated, it travels slowly for example, when a person is trying to talk underwater, the other person wont hear it because the sound travels slowly, some people use a machine to hear creatures underwater.