NCERT Conduction Convection Radiation MCQs
CBSE Class 7 Science – Conduction, Convection & Radiation MCQs
Class: 7
Subject: Science
Section: Heat
Topic: NCERT Conduction, Convection & Radiation
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each question includes detailed, concept-clearing explanations for better understanding of heat transfer modes.
Subject: Science
Section: Heat
Topic: NCERT Conduction, Convection & Radiation
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each question includes detailed, concept-clearing explanations for better understanding of heat transfer modes.
1. Transfer of heat through direct contact is called:
Answer: C. Conduction
In conduction, heat flows from particle to particle without bulk movement of matter, common in solids.
In conduction, heat flows from particle to particle without bulk movement of matter, common in solids.
2. Best conductors of heat are usually:
Answer: B
Metals have free electrons that transfer heat quickly.
Metals have free electrons that transfer heat quickly.
3. Heat transfer in liquids mainly occurs by:
Answer: B
Heated liquid rises while cooler liquid sinks forming convection currents.
Heated liquid rises while cooler liquid sinks forming convection currents.
4. Heat transfer without any medium is:
Answer: C
Radiation transfers heat through electromagnetic waves.
Radiation transfers heat through electromagnetic waves.
5. Example of conduction:
Answer: C
Heat travels along the rod by conduction.
Heat travels along the rod by conduction.
6. Example of convection:
Answer: B
Water moves forming convection currents.
Water moves forming convection currents.
7. Example of radiation:
Answer: C
No medium is required.
No medium is required.
8. Conduction occurs fastest in:
Answer: A
Particles are closely packed.
Particles are closely packed.
9. Convection cannot occur in:
Answer: A
Particles in solids cannot move freely.
Particles in solids cannot move freely.
10. Radiation travels in:
Answer: A
Radiant heat travels like light.
Radiant heat travels like light.
11. Handle of cooking utensils are made of:
Answer: B
They are insulators preventing burns.
They are insulators preventing burns.
12. Sea breeze is caused by:
Answer: C
Air circulation due to uneven heating.
Air circulation due to uneven heating.
13. Land breeze occurs at:
Answer: B
Land cools faster than sea.
Land cools faster than sea.
14. Good absorbers of heat are:
Answer: C
They absorb maximum radiation.
They absorb maximum radiation.
15. Shiny surfaces are good:
Answer: B
They reflect heat radiation.
They reflect heat radiation.
16. Vacuum flask prevents heat loss by:
Answer: D
Vacuum stops conduction & convection; silvering reduces radiation.
Vacuum stops conduction & convection; silvering reduces radiation.
17. Air is a:
Answer: B
Air acts as an insulator.
Air acts as an insulator.
18. Heating by fireplace warms room by:
Answer: D
Warm air circulates and radiation spreads heat.
Warm air circulates and radiation spreads heat.
19. Metals feel colder than wood because:
Answer: B
They draw heat faster from our body.
They draw heat faster from our body.
20. Heat transfer in gases mainly occurs by:
Answer: B
Gas molecules move freely forming convection currents.
Gas molecules move freely forming convection currents.