Heat Introduction Classification Questions

Heat is the transfer of thermal energy from one body or region to another body or region. Heat is energy in the form of random motion of molecules. Heat transfer can lead to an exchange of thermal energy and transfer of energy by conduction, convection or radiation. Conduction is the transfer of heat or thermal energy through direct contact between surfaces in physical contact with each other. Conduction is heat transfer between objects where heat flows from the warmer material to the cooler material. The method of transferring heat by the movement of the heated substance is known as convection. Transferring heat through electromagnetic waves is known as radiation. Heat is classified as cold and hot.

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Important Heat Introduction Classification Questions with Answers

1. State true or false: Heat can be converted to another form of energy.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: Heat can be converted to another form of energy.

For example, in a motorised vehicle, heat is converted to mechanical energy.

2. Object with high heat content is said to be ______.

1. Semi cold
2. Cold
3. Hot
4. None of the options

Answer: c) Hot

Explanation: Objects with high heat content are defined as hot.

3. The Sun is the source of _______.

1. Only light
2. Only heat
3. Both heat and light
4. None of the options

Answer: c) Both heat and light

Explanation: The Sun is the source of heat and light.

4. Temperature is the measure of the ______ of the body.

1. Hotness
2. Coldness
3. Hotness or coldness
4. None of the options

Answer: c) Hotness or coldness

Explanation: The degree of hotness or coldness of a body gives the temperature.

5. In which among the following processes does solid tend to get converted to vapours?

1. Heating
2. Melting
3. Breaking
4. Sublimation

Answer: d) Sublimation

Explanation: During the process of sublimation, solids tend to get converted to vapours.

6. In the process of heat transfer through conduction, does it involve direct contact?

1. YES
2. NO

Answer: a) YES

Explanation: The transfer of heat that takes place between molecules and atoms in direct contact is known as conduction.

7. The method in which the transfer of heat takes place by electromagnetic waves is _________.

1. Conduction
2. Convention
3. Radiation
4. None of the options

Answer: c) Radiation

Explanation: In the process of radiation, the transfer of heat takes place through electromagnetic waves.

8. Which among the following is a scale to measure temperature?

1. Kelvins (K)
2. Celsius (C)
3. Fahrenheit (F)
4. All of the above

Answer: d) All of the above

Explanation: Celsius (C), Fahrenheit (F) and Kelvins (K) are various scales used to measure the temperature.

9. When the temperature of the body increases, the vibrations of molecules or atoms ______.

1. Decrease
2. Remains constant
3. Increase
4. Becomes zero

Answer: c) Increase

Explanation: When the temperature of the body increases, the vibrations of molecules or atoms also increase.

10. Why does the heat energy flow from a higher-temperature substance to a lower-temperature substance?

Answer: The molecules vibrate faster in higher-temperature substances and transfer their energy to the molecules vibrating slower in lower-temperature substances.

To know more about heat transfer in detail, click on the video below.

Practice Questions

1. What is heat?
2. What is temperature?
3. What are the scales used to measure the temperature of a body?
4. What is the mechanism through which heat transfer takes place?
5. List the sources of heat.