Chapter Exam

Chapter-3 Heat — Online MCQ Test

Q: Which mode of heat transfer can occur through a vacuum?

Answer: C. Radiation — Radiation does not need a material medium and can travel through vacuum. This is how heat from the Sun reaches Earth.

Q: The SI unit of heat is:

Answer: A. Joule — Heat is a form of energy, and its SI unit is joule. Temperature has different units such as kelvin and degree Celsius.

Q: Why are cooking utensils often made with wooden or plastic handles?

Answer: B. They prevent heat transfer to the hand — Wood and plastic are poor conductors of heat, so they reduce heat transfer to the hand. This makes the utensil safer to hold.

Q: Which of the following is NOT a method of heat transfer?

Answer: D. Compression — Conduction, convection, and radiation are the three modes of heat transfer. Compression is not a mode of heat transfer.

Q: A metal rod has one end heated. Which observation best shows the role of conduction?

Answer: A. The far end becomes hot after some time — Heat travels through the rod from the hot end to the cold end by conduction. This causes the far end to become hot after some time.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-3 Heat with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Describes heat transfer thermal expansion and practical applications of heat Keywords Heat Conduction Convection Radiation Expansion. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-3 Heat — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE — Chapter-3 Heat, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which mode of heat transfer can occur through a vacuum?

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

Answer: C. Radiation
Radiation does not need a material medium and can travel through vacuum. This is how heat from the Sun reaches Earth.

The SI unit of heat is:

A. Joule ✓
B. Kelvin
C. Degree Celsius
D. Newton

Answer: A. Joule
Heat is a form of energy, and its SI unit is joule. Temperature has different units such as kelvin and degree Celsius.

Why are cooking utensils often made with wooden or plastic handles?

A. They are good conductors of heat
B. They prevent heat transfer to the hand ✓
C. They melt easily
D. They increase the temperature of food

Answer: B. They prevent heat transfer to the hand
Wood and plastic are poor conductors of heat, so they reduce heat transfer to the hand. This makes the utensil safer to hold.

Which of the following is NOT a method of heat transfer?

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

Answer: D. Compression
Conduction, convection, and radiation are the three modes of heat transfer. Compression is not a mode of heat transfer.

A metal rod has one end heated. Which observation best shows the role of conduction?

A. The far end becomes hot after some time ✓
B. The rod changes into a liquid
C. The rod emits light
D. The rod becomes smaller in length immediately

Answer: A. The far end becomes hot after some time
Heat travels through the rod from the hot end to the cold end by conduction. This causes the far end to become hot after some time.