Heat can move from one place to another in different ways such as conduction, convection, and radiation. This chapter explains how heat transfer takes place in solids, liquids, gases, and even in space. The following MCQs will help you revise key concepts like sea breeze, land breeze, insulation, and the role of different surfaces in absorbing and reflecting heat.
MCQ Questions for Class 7 Science Chapter 7 Heat Transfer in Nature with Answers
Question 1: Which method of heat transfer does not require a medium?
a) Conduction
b) Convection
c) Radiation
d) Reflection
Answer:
c) Radiation — Radiation can take place even through vacuum without the need of a medium.
Question 2: The transfer of heat in solids primarily takes place through?
a) Convection
b) Radiation
c) Conduction
d) Evaporation
Answer:
c) Conduction — In solids, heat is transferred mainly by conduction.
Question 3: Which surface is the best absorber of heat?
a) Shiny white
b) Smooth silver
c) Rough black
d) Transparent
Answer:
c) Rough black — Black and rough surfaces absorb maximum heat.
Question 4: Land and sea breezes occur mainly due to?
a) Radiation
b) Convection
c) Conduction
d) Reflection
Answer:
b) Convection — They are caused by convection currents due to unequal heating.
Question 5: Which method of heat transfer is responsible for heating water in a vessel?
a) Conduction
b) Convection
c) Radiation
d) Evaporation
Answer:
b) Convection — Water gets heated by convection currents.
Question 6: Heat transfer from the Sun to Earth occurs by?
a) Conduction
b) Convection
c) Radiation
d) Reflection
Answer:
c) Radiation — Sun’s heat reaches Earth through radiation.
Question 7: In which of the following does convection of heat take place?
a) Solids
b) Liquids
c) Gases
d) Both liquids and gases
Answer:
d) Both liquids and gases — Convection occurs in fluids (liquids and gases).
Question 8: Which material is a poor conductor of heat?
a) Copper
b) Aluminium
c) Wood
d) Iron
Answer:
c) Wood — Wood is a poor conductor of heat.
Question 9: The process of heat transfer by molecular collision in solids is called?
a) Radiation
b) Convection
c) Conduction
d) Evaporation
Answer:
c) Conduction — Heat transfer in solids happens by conduction.
Question 10: Sea breeze generally occurs during?
a) Morning
b) Afternoon
c) Night
d) Winter
Answer:
b) Afternoon — Sea breeze occurs during the day when land heats up faster.
Question 11: Which of the following is a good conductor of heat?
a) Glass
b) Plastic
c) Aluminium
d) Rubber
Answer:
c) Aluminium — Aluminium conducts heat efficiently.
Question 12: Which of the following is an example of convection in daily life?
a) Touching a hot iron rod
b) Heating water in a kettle
c) Sunlight warming the ground
d) Ironing clothes
Answer:
b) Heating water in a kettle — Water is heated by convection currents.
Question 13: The vacuum in a thermos flask prevents?
a) Radiation
b) Conduction and convection
c) Only conduction
d) Only convection
Answer:
b) Conduction and convection — The vacuum prevents both conduction and convection.
Question 14: Which color reflects most of the heat?
a) Black
b) White
c) Red
d) Green
Answer:
b) White — White reflects most of the heat.
Question 15: The air near the ceiling of a room is usually warmer because?
a) Radiation
b) Cold air rises
c) Hot air rises
d) Conduction
Answer:
c) Hot air rises — Due to convection, hot air rises making the ceiling warmer.
Question 16: Which of the following is the fastest method of heat transfer?
a) Conduction
b) Convection
c) Radiation
d) Absorption
Answer:
c) Radiation — Radiation travels at the speed of light, making it fastest.
Question 17: The transfer of heat in liquids is due to?
a) Molecular vibration
b) Conduction
c) Convection currents
d) Radiation
Answer:
c) Convection currents — Heat transfer in liquids occurs mainly by convection.
Question 18: Which of the following prevents heat loss by radiation?
a) Dark surfaces
b) White shiny surfaces
c) Vacuum
d) Convection
Answer:
b) White shiny surfaces — They reflect radiation, reducing heat loss.
Question 19: Which type of clothes should be worn in summer to keep cool?
a) Dark colored
b) White or light colored
c) Thick woolen
d) Bright red
Answer:
b) White or light colored — They reflect heat and keep us cool.
Question 20: In a room, ventilation is provided near the ceiling because?
a) Cold air settles down
b) Warm air rises up
c) Light passes through
d) To prevent conduction
Answer:
b) Warm air rises up — Ventilation allows hot air to escape.
Question 21: The handles of cooking utensils are made of wood or plastic because?
a) They are good conductors
b) They are poor conductors
c) They absorb heat quickly
d) They look attractive
Answer:
b) They are poor conductors — Wood and plastic prevent heat transfer to hands.
Question 22: Which is an example of conduction?
a) Sea breeze
b) Heating a metal rod
c) Heating water
d) Sunlight
Answer:
b) Heating a metal rod — Heat travels through solids by conduction.
Question 23: Which type of heat transfer makes the roof of a house hot during daytime?
a) Convection
b) Radiation
c) Conduction
d) Reflection
Answer:
b) Radiation — Sunlight heats roofs through radiation.
Question 24: Convection currents are formed because of?
a) Density difference in fluids
b) Radiation
c) Conduction
d) Reflection
Answer:
a) Density difference in fluids — Hot fluids become lighter and rise.
Question 25: Which of the following prevents heat transfer by conduction?
a) Metals
b) Air
c) Liquids
d) Gases
Answer:
b) Air — Air is a poor conductor of heat.
Question 26: The water at the bottom of a vessel gets heated due to?
a) Radiation
b) Conduction
c) Convection
d) Evaporation
Answer:
b) Conduction — Heat passes from the base of the vessel to water by conduction.
Question 27: Which of the following surfaces is a good reflector of heat?
a) Black
b) White
c) Rough
d) Transparent
Answer:
b) White — White and shiny surfaces are good reflectors.
Question 28: Which of the following materials is used in making thermos flask to reduce heat loss?
a) Black paint
b) Silvered walls
c) Wooden covering
d) Glass wool only
Answer:
b) Silvered walls — They reduce heat loss by radiation.
Question 29: Why do we wear woolen clothes in winter?
a) They are shiny
b) They absorb water
c) They trap air
d) They reflect heat
Answer:
c) They trap air — Air is a poor conductor, so it keeps us warm.
Question 30: What happens to air when it gets heated?
a) It becomes heavier
b) It becomes lighter
c) It remains the same
d) It contracts
Answer:
b) It becomes lighter — Warm air rises because it becomes less dense.
Question 31: In deserts, people wear white clothes mainly to?
a) Absorb heat
b) Reflect heat
c) Conserve energy
d) Increase conduction
Answer:
b) Reflect heat — White clothes reflect heat and keep them cool.
Question 32: Which method of heat transfer is used in solar cookers?
a) Conduction
b) Convection
c) Radiation
d) Reflection
Answer:
c) Radiation — Solar cookers use radiation from the Sun.
Question 33: Conduction of heat is fastest in?
a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer:
a) Solids — Conduction is most efficient in solids.
Question 34: Which is not a method of heat transfer?
a) Conduction
b) Convection
c) Radiation
d) Filtration
Answer:
d) Filtration — Filtration is not a method of heat transfer.
Question 35: In which medium is conduction of heat negligible?
a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer:
d) Vacuum — No conduction can take place in vacuum.
Fill in the Blanks Questions for Class 7 Science Chapter 7 Heat Transfer in Nature
1. Heat from the Sun reaches the Earth through ___.
Answer:
Radiation
2. The transfer of heat in solids takes place mainly by ___.
Answer:
Conduction
3. The transfer of heat in liquids and gases occurs by ___.
Answer:
Convection
4. The breeze that blows from sea towards land during daytime is called ___.
Answer:
Sea breeze
5. The breeze that blows from land towards sea during night is called ___.
Answer:
Land breeze
6. A ___ surface is the best absorber of heat.
Answer:
Black and rough
7. A shiny white surface is a good ___ of heat.
Answer:
Reflector
8. The medium that prevents both conduction and convection is ___.
Answer:
Vacuum
9. Woolen clothes keep us warm in winter because they trap ___.
Answer:
Air
10. Convection currents in air are responsible for the formation of ___ in nature.
Answer:
Winds
11. The handles of cooking utensils are made of plastic or wood because these materials are ___ conductors of heat.
Answer:
Poor
12. In a room, the warm air is found near the ___.
Answer:
Ceiling
13. The main mode of heat transfer in vacuum is ___.
Answer:
Radiation
14. Silvered walls of a thermos flask reduce heat loss due to ___.
Answer:
Radiation
15. In deserts, people prefer wearing ___ clothes to keep themselves cool.
Answer:
White or light-colored
Class 7 Science MCQ
- MCQ on The Ever-Evolving World of Science for Class 7
- MCQ on Exploring Substances: Acidic, Basic, and Neutral for Class 7
- MCQ on Electricity: Circuits and their Components for Class 7
- MCQ on The World of Metals and Non-metals for Class 7
- MCQ on Changes Around Us: Physical and Chemical for Class 7
- MCQ on Adolescence: A Stage of Growth and Change for Class 7
- MCQ on Measurement of Time and Motion for Class 7
- MCQ on Life Processes in Animals for Class 7
- MCQ on Life Processes in Plants for Class 7
- MCQ on Light: Shadows and Reflections for Class 7
- MCQ on Earth, Moon, and the Sun for Class 7
