Class 7 CBSE Physics Chapter 3: Heat - MCQs

 Class 7 CBSE Physics Chapter : Heat

Multiple Choice Questions (20 Questions)

Instructions: Choose the correct answer for each question.

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1. Heat is a form of:
a) Matter b) Energy c) Force d) Pressure

2. The SI unit of temperature is:
a) Celsius b) Fahrenheit c) Kelvin d) Joule

3. Which of the following is the best conductor of heat?
 a) Wood b) Plastic c) Copper d) Glass

4. The process of heat transfer in liquids and gases is called:
a) Conduction b) Convection c) Radiation d) Evaporation

5. Heat transfer without any medium is called:
a) Conduction b) Convection c) Radiation d) Absorption

6. The normal temperature of human body is:
 a) 37°C b) 98°C c) 100°C d) 36°C

7. Which thermometer is used to measure very high temperatures?
a) Clinical thermometer b) Laboratory thermometer c) Digital thermometer d) Pyrometer

8. The maximum temperature that a clinical thermometer can measure is:
a) 100°C b) 110°C c) 42°C d) 50°C

9. Sea breeze occurs during:
a) Day time b) Night time c) Both day and night d) Winter only

10. Land breeze occurs during:
a) Day time b) Night time c) Both day and night d) Summer only

11. Which color absorbs heat the most?
a) White b) Yellow c) Black d) Red

12. Which color reflects heat the most?
a) Black b) Red c) Blue d) White

13. The kink in a clinical thermometer is used to:
 a) Increase accuracy b) Prevent mercury from flowing back c) Make it look attractive d) Reduce cost

14. Woollen clothes keep us warm because:
a) Wool is a good conductor of heat b) Wool generates heat c) Wool is a bad conductor of heat d) Wool absorbs heat from surroundings

15. The transfer of heat in solids takes place by:
a) Conduction b) Convection c) Radiation d) All of the above

16. Which of the following is a good conductor of heat?
a) Paper b) Cotton c) Iron d) Rubber

17. The hotness or coldness of an object is determined by its: a) Heat b) Temperature c) Energy d) Mass

18. In conduction, heat is transferred through:
a) Movement of particles b) Electromagnetic waves c) Direct contact d) Air currents

19. The handle of a frying pan is made of plastic or wood because:
a) They are cheap b) They are bad conductors of heat c) They are light in weight d) They look good

20. When we rub our palms together, they become warm due to:
a) Conduction b) Convection c) Radiation d) Friction

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Answer Key

1. b) Energy - Heat is a form of energy that flows from hot to cold objects
2. c) Kelvin - Kelvin is the SI unit of temperature
3. c) Copper - Metals like copper are excellent heat conductors
4. b) Convection - Heat transfer in fluids occurs through convection
5. c) Radiation - Heat can transfer through vacuum by radiation
6. a) 37°C - Normal human body temperature is 37°C
7. d) Pyrometer - Used for measuring very high temperatures
8. c) 42°C - Clinical thermometers typically range from 35°C to 42°C
9. a) Day time - Sea breeze occurs when land heats up faster than sea
10. b) Night time - Land breeze occurs when land cools faster than sea
11. c) Black - Black surfaces absorb maximum heat
12. d) White - White surfaces reflect maximum heat
13. b) Prevent mercury from flowing back - The kink prevents mercury from falling back
14. c) Wool is a bad conductor of heat - Wool traps air which is a poor conductor
15. a) Conduction - Heat transfer in solids occurs mainly by conduction
16. c) Iron - Iron is a metal and good conductor of heat
17. b) Temperature - Temperature measures hotness or coldness
18. c) Direct contact - Conduction requires direct contact between particles
19. b) They are bad conductors of heat - Prevents heat transfer to hands
20. d) Friction - Rubbing creates friction which generates heat