Question

3. What may happen to a solid when it is continuously exposed to heat?
It may
A. become heavier
B. decrease in volume
C. expand
D. melt
4. What happens to a liquid when heated? It
A. increases in temperature
B. increases in volume
C. increases in water level
D. remains the same
5. When heat is transferred through gases it is called
A. combustion
D. radiation
B. conduction
C. convection
6. Which of the following is good to use when we go out on a sunny day?
A. sunblock
B. sunglasses
D. All of the
C. umbrella
7. What type of heat transfer is involved in boiling water?
A. conduction
B. convection
C. insulation
D. radiatio​

Answer 1

ꍏꈤꌚꅐꏂꋪ:-

1. What may happen to a solid when it is continuously exposed to heat?

=> D. melt

2. What happens to a liquid when heated? It

=> B. increases in volume

3. When heat is transferred through gases it is called

=> C. convection

4. Which of the following is good to use when we go out on a sunny day?

=> D. All of these

5. What type of heat transfer is involved in boiling water?

=> B. convection

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Answer 2

Answer:

1. Solid expand when it is continuously exposed to heat.
2. Liquid increases in volume when heated.
3. When heat is transferred through gases it is called convection.
4. All of the options are good to use when we go out on a sunny day.
5. Conduction is involved in boiling water.

Explanation:

1. The molecules start to make solid in vibration when it is heated. As a result, molecules take up space and solid matter begins to expand. If the heating of solid matter continues, particles start to break free from the strong attraction that causes it to melt.
2. Heat is absorbed by the molecules and starts to move faster when the liquid is heated. Within the liquid, the vapor bubbles rise to the surface and the liquid expands. Hence, increases in volume.
3. Heat transfer through gases and liquids is known as convection. Convection mainly occurs when gas from the hot object moves to a cool area.
4. The radiation that comes from the sun is very dangerous to our skin, mainly the UV rays that cause damage to skin cells, tanning beds, and sunlamps. Therefore, sunblock, sunglasses, and an umbrella are good to use when outing on a sunny day.
5. The flowing of heat from high to low temperature is called conduction. From the bottom of the container, the heat from the heat source is transferred to the boiling water through conduction.