Chapter Exam

Chapter 7: Heat Transfer in Nature — Online MCQ Test

Q: Which unit is commonly used to measure temperature in science?

Answer: A. Kelvin — Temperature is measured using units such as degree Celsius and Kelvin. Among the given options, Kelvin is the correct unit.

Q: Heat flows naturally from a ______ body to a colder body.

Answer: B. hotter — Heat always moves from a body at higher temperature to a body at lower temperature until both reach the same temperature.

Q: A metal spoon becomes hot when one end is kept in hot tea. This is mainly due to:

Answer: A. Conduction — In conduction, heat travels through a solid from the hotter part to the colder part. A metal spoon is a good conductor of heat.

Q: Why do people wear woollen clothes in winter?

Answer: B. Wool traps air and reduces heat loss — Woollen clothes trap air, and air is a poor conductor of heat. This helps the body retain heat in cold weather.

Q: A metal lid on a glass jar is difficult to open. Which method is most effective according to thermal expansion?

Answer: B. Heat only the metal lid in warm water — Metal expands on heating more than glass. Heating the lid makes it expand slightly and become easier to remove.

SCIENCE · Grade 7 · CBSE(NCERT)

Practice Chapter 7: Heat Transfer in Nature with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 7 SCIENCE. This chapter covers: Heat Temperature Conduction Convection Radiation Thermal expansion Water cycle Heat transfer Insulation. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Heat Transfer in Nature — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 7 SCIENCE — Chapter 7: Heat Transfer in Nature, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which unit is commonly used to measure temperature in science?

A. Kelvin ✓
B. Metre
C. Kilogram
D. Second

Answer: A. Kelvin
Temperature is measured using units such as degree Celsius and Kelvin. Among the given options, Kelvin is the correct unit.

Heat flows naturally from a ______ body to a colder body.

A. smaller
B. hotter ✓
C. heavier
D. shiny

Answer: B. hotter
Heat always moves from a body at higher temperature to a body at lower temperature until both reach the same temperature.

A metal spoon becomes hot when one end is kept in hot tea. This is mainly due to:

A. Conduction ✓
B. Convection
C. Radiation
D. Condensation

Answer: A. Conduction
In conduction, heat travels through a solid from the hotter part to the colder part. A metal spoon is a good conductor of heat.

Why do people wear woollen clothes in winter?

A. Wool produces heat
B. Wool traps air and reduces heat loss ✓
C. Wool reflects all sunlight
D. Wool increases evaporation

Answer: B. Wool traps air and reduces heat loss
Woollen clothes trap air, and air is a poor conductor of heat. This helps the body retain heat in cold weather.

A metal lid on a glass jar is difficult to open. Which method is most effective according to thermal expansion?

A. Cool the metal lid with ice
B. Heat only the metal lid in warm water ✓
C. Fill the jar with cold water
D. Keep the jar in the refrigerator for long

Answer: B. Heat only the metal lid in warm water
Metal expands on heating more than glass. Heating the lid makes it expand slightly and become easier to remove.