Temperature and Heat Transfer MCQs
CBSE Class 7 Science – Temperature and Heat Transfer MCQs with Answers & Explanations
Class: 7
Subject: Science
Section: Heat
Topic: Temperature and Heat Transfer
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each answer includes an elaborate, concept-clearing explanation for better understanding.
Subject: Science
Section: Heat
Topic: Temperature and Heat Transfer
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each answer includes an elaborate, concept-clearing explanation for better understanding.
1. Temperature is the measure of:
Answer: B. Hotness or coldness
Temperature indicates how hot or cold an object is, not the total heat energy it contains.
Temperature indicates how hot or cold an object is, not the total heat energy it contains.
2. Heat always flows from:
Answer: B
Heat naturally transfers from higher temperature to lower temperature until equilibrium is reached.
Heat naturally transfers from higher temperature to lower temperature until equilibrium is reached.
3. SI unit of temperature is:
Answer: C
Kelvin is the SI unit, though Celsius is commonly used.
Kelvin is the SI unit, though Celsius is commonly used.
4. Device used to measure temperature:
Answer: B
Thermometers measure temperature using expansion of liquids like mercury.
Thermometers measure temperature using expansion of liquids like mercury.
5. Transfer of heat in solids occurs by:
Answer: C
Heat passes particle to particle through direct contact.
Heat passes particle to particle through direct contact.
6. Transfer of heat in liquids is mainly by:
Answer: B
Hot liquid rises, cool liquid sinks forming convection currents.
Hot liquid rises, cool liquid sinks forming convection currents.
7. Heat from the Sun reaches Earth by:
Answer: C
Radiation transfers heat without any medium.
Radiation transfers heat without any medium.
8. Good conductors of heat are generally:
Answer: A
Metals allow heat to pass easily due to free electrons.
Metals allow heat to pass easily due to free electrons.
9. Poor conductors are called:
Answer: A
Insulators resist heat flow (e.g., wood, plastic).
Insulators resist heat flow (e.g., wood, plastic).
10. Wool keeps us warm because it:
Answer: B
Air trapped between fibres prevents heat loss.
Air trapped between fibres prevents heat loss.
11. Sea breeze occurs due to:
Answer: C
Warm air over land rises; cool air from sea replaces it.
Warm air over land rises; cool air from sea replaces it.
12. Land breeze occurs at:
Answer: B
Land cools faster at night; air moves toward sea.
Land cools faster at night; air moves toward sea.
13. Dark surfaces are:
Answer: B
They absorb more radiant heat.
They absorb more radiant heat.
14. Light coloured clothes are worn in summer because they:
Answer: B
Reflection keeps the body cooler.
Reflection keeps the body cooler.
15. Clinical thermometer range is:
Answer: B
Designed for human body temperature.
Designed for human body temperature.
16. Laboratory thermometer is used to measure:
Answer: C
Used in experiments.
Used in experiments.
17. Mercury expands on:
Answer: B
Expansion helps measure temperature.
Expansion helps measure temperature.
18. Kink in thermometer prevents:
Answer: C
It holds mercury for reading.
It holds mercury for reading.
19. Best conductor among these:
Answer: A
Copper conducts heat very efficiently.
Copper conducts heat very efficiently.
20. Heat transfer in gases mainly occurs by:
Answer: B
Gas molecules move freely forming convection currents.
Gas molecules move freely forming convection currents.