6th std science term- 2 Unit 1 Lesson Heat ( mcq, question and answer)

Multiple Choice Questions (MCQs) :--

1. Heat always flows from:
   - (a) Cold to hot
   - (b) Hot to cold
   - (c) Between objects of the same temperature
   - **Answer:** (b) Hot to cold

2. The device used to measure temperature is:
   - (a) Barometer
   - (b) Thermometer
   - (c) Ammeter
   - **Answer:** (b) Thermometer

3. The unit of heat energy is:
   - (a) Meter
   - (b) Liter
   - (c) Joule
   - **Answer:** (c) Joule

4. Which of these materials is a good conductor of heat?
   - (a) Wood
   - (b) Iron
   - (c) Plastic
   - **Answer:** (b) Iron

5. The boiling point of water is:
   - (a) 0°C
   - (b) 100°C
   - (c) 50°C
   - **Answer:** (b) 100°C

6. Which is an example of a poor conductor of heat?
   - (a) Metal
   - (b) Wood
   - (c) Iron
   - **Answer:** (b) Wood

7. Which temperature scale is commonly used in scientific experiments?
   - (a) Celsius
   - (b) Fahrenheit
   - (c) Kelvin
   - **Answer:** (a) Celsius

8. The process of heat transfer in liquids and gases is called:
   - (a) Conduction
   - (b) Convection
   - (c) Radiation
   - **Answer:** (b) Convection

9. Which method of heat transfer does not require a medium?
   - (a) Conduction
   - (b) Convection
   - (c) Radiation
   - **Answer:** (c) Radiation

10. Heat transfer through direct contact is called:
    - (a) Conduction
    - (b) Convection
    - (c) Radiation
    - **Answer:** (a) Conduction

11. The freezing point of water in Celsius is:
    - (a) 0°C
    - (b) 32°C
    - (c) 100°C
    - **Answer:** (a) 0°C

12. Which part of the thermometer contains mercury?
    - (a) Bulb
    - (b) Stem
    - (c) Capillary tube
    - **Answer:** (a) Bulb

13. A material that allows heat to pass through it easily is a:
    - (a) Insulator
    - (b) Conductor
    - (c) Radiator
    - **Answer:** (b) Conductor

14. Heat energy from the sun reaches Earth by:
    - (a) Conduction
    - (b) Convection
    - (c) Radiation
    - **Answer:** (c) Radiation

15. The SI unit of temperature is:
    - (a) Celsius
    - (b) Fahrenheit
    - (c) Kelvin
    - **Answer:** (c) Kelvin

16. The best material for insulating a hot drink is:
    - (a) Glass
    - (b) Metal
    - (c) Foam
    - **Answer:** (c) Foam

17. When a solid is heated, its particles:
    - (a) Move slower
    - (b) Move faster
    - (c) Stop moving
    - **Answer:** (b) Move faster

18. A body at 0°C will have:
    - (a) More heat than one at 100°C
    - (b) No heat energy
    - (c) Less heat than one at 100°C
    - **Answer:** (c) Less heat than one at 100°C

19. Heat is a form of:
    - (a) Matter
    - (b) Energy
    - (c) Solid
    - **Answer:** (b) Energy

20. The transfer of heat without the involvement of any particles is:
    - (a) Conduction
    - (b) Convection
    - (c) Radiation
    - **Answer:** (c) Radiation

Fill in the Blanks :--

1. Heat flows from a ____ body to a ____ body. 
   **Answer:** Hot, cold

2. The device used to measure temperature is called a ____. 
   **Answer:** Thermometer

3. The SI unit of heat is ____. 
   **Answer:** Joule

4. Materials that allow heat to pass through them easily are called ____. 
   **Answer:** Conductors

5. Heat transfer through solid materials occurs by ____. 
   **Answer:** Conduction

6. Water boils at ____. 
   **Answer:** 100°C

7. The normal human body temperature is ____. 
   **Answer:** 37°C

8. Good ____ do not allow heat to pass through them. 
   **Answer:** Insulators

9. The boiling point of water in Fahrenheit is ____. 
   **Answer:** 212°F

10. Heat from the sun reaches us by ____. 
    **Answer:** Radiation

11. An insulator is a ____ conductor of heat. 
    **Answer:** Poor

12. The transfer of heat in liquids and gases takes place by ____. 
    **Answer:** Convection

13. Mercury is commonly used in ____ thermometers. 
    **Answer:** Clinical

14. The amount of heat energy in an object depends on its ____. 
    **Answer:** Temperature

15. When we heat water, it transfers heat by ____. 
    **Answer:** Convection

16. The freezing point of water is ____. 
    **Answer:** 0°C

17. Copper is a good ____. 
    **Answer:** Conductor

18. Air is a poor ____ of heat. 
    **Answer:** Conductor

19. The SI unit of temperature is ____. 
    **Answer:** Kelvin

20. Heat is a form of ____. 
    **Answer:** Energy

Match the Following :--

| Column A          | Column B           |
|-------------------|--------------------|
| 1. Conduction     | a. Without medium  |
| 2. Convection     | b. Good conductor  |
| 3. Radiation      | c. Requires medium |
| 4. Copper         | d. Transfer in solids |
| 5. Insulator      | e. Air             |
| 6. Thermometer    | f. Measures temperature |
| 7. Heat energy    | g. Joule           |
| 8. Celsius        | h. Temperature scale |
| 9. Boiling point  | i. 100°C           |
| 10. Freezing point | j. 0°C            |

**Answers:**
1 - d, 2 - c, 3 - a, 4 - b, 5 - e, 6 - f, 7 - g, 8 - h, 9 - i, 10 - j

Short Questions and Answers :--

1. **What is heat?** 
   Heat is a form of energy that causes objects to become warmer.

2. **How does heat transfer by conduction?** 
   Heat transfer by conduction occurs when particles in a solid vibrate and pass energy to neighboring particles.

3. **What is convection?** 
   Convection is the transfer of heat in liquids and gases where warmer areas rise and cooler areas sink, creating a cycle.

4. **Define radiation.** 
   Radiation is the transfer of heat without any medium, as in the heat from the sun reaching Earth.

5. **What is a thermometer?** 
   A thermometer is an instrument used to measure temperature.

6. **What are conductors?** 
   Conductors are materials that allow heat to pass through them easily, like metals.

7. **Name a poor conductor of heat.** 
   Wood is a poor conductor of heat.

8. **What is the freezing point of water?** 
   The freezing point of water is 0°C.

9. **How is heat different from temperature?** 
   Heat is energy in transfer due to temperature difference, while temperature measures the intensity of heat.

10. **What is the SI unit of heat?** 
    The SI unit of heat is the Joule.

11. **Why do we use mercury in thermometers?** 
    Mercury expands uniformly with temperature and is easily visible in the thermometer.

12. **What is the boiling point of water?** 
    The boiling point of water is 100°C.

13. **Define insulators.** 
    Insulators are materials that do not allow heat to pass through them easily.

14. **What type of heat transfer occurs in solids?** 
    Conduction occurs in solids.

15. **Why does heat flow from hot to cold?** 
    Heat flows from hot to cold due to the temperature difference.

16. **What are examples of conductors?** 
    Examples include metals like copper and aluminum.

17. **What are examples of insulators?** 
    Examples include rubber, plastic, and wood.

18. **How does heat transfer in liquids?** 
    By convection,

where heated particles move to cooler areas.

19. **What is the normal human body temperature?** 
    The normal human body temperature is 37°C.

20. **Why is foam used as an insulator?** 
    Foam contains air pockets that slow down heat transfer.