Question

Physics Questions
Please Answer​

Answer 1

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Answer 2

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Fill in the blanks :-

4. Heat transfer in fluids almost occur by convection.

5. Transfer of heat through a vacuum occurs by radiation.

6. The most important mode of transfer of heat in solids is conduction.

7. Adding salt decreases melting point of ice.

True or False :-

1. When a material is heated its density decreases.

➣ True

2. Cotton is a better insulator when it is

compressed than when it is fluffy.

➣ False

Correction :-

Cotton is a Bad insulator when it is compressed than when it is fluffy.

3. Convection plays a central role in setting

up breezes.

➣ True

4. Synthetic materials are non flammable.

➣ False

Correction :-

Synthetic materials are flammable.

5. Good absorbers of radiation are poor

reflectors, and vice versa.

➣ True

6. Ice and water coexist at 32 F.

➣.True

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Know more -

Convection :-

• It is the process of heat transfer in which sections of a fluid move up and down due to change in density with temperature.
• It occurs mostly in fluids.
• Land breeze and sea breeze are convection currents.

Conduction :-

• It is the process of heat transfer between sections of material that are themselves stationary and in contact with each other.
• Metals are good conductors.