Chapter-4 Heat — Online MCQ Test
SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-4 Heat with a free chapter-wise online MCQ test.
This chapter covers: conduction convection radiation Covers heat transfer thermal expansion and temperature measurement.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-4 Heat — Important Questions & Answers
Which instrument is used to measure temperature?
- A. Barometer
- B. Thermometer
- C. Speedometer
- D. Hygrometer
Answer: B. Thermometer
A thermometer is used to measure the temperature of a body or substance.
A thermometer is used to measure the temperature of a body or substance.
Heat transfer through a solid without the actual movement of particles is called ______.
- A. Conduction
- B. Convection
- C. Radiation
- D. Evaporation
Answer: A. Conduction
In conduction, heat passes from one particle to another in a solid without the bulk movement of matter.
In conduction, heat passes from one particle to another in a solid without the bulk movement of matter.
Why does the liquid in a thermometer rise when heated?
- A. The liquid becomes heavier
- B. The glass tube shrinks
- C. The liquid expands
- D. Air enters the thermometer
Answer: C. The liquid expands
When heated, the liquid expands and rises in the narrow tube.
When heated, the liquid expands and rises in the narrow tube.
Which of the following is NOT a mode of heat transfer?
- A. Conduction
- B. Convection
- C. Radiation
- D. Reflection
Answer: D. Reflection
Reflection is not a mode of heat transfer. The three modes are conduction, convection, and radiation.
Reflection is not a mode of heat transfer. The three modes are conduction, convection, and radiation.
A student says, 'A dark, rough surface absorbs and emits heat better than a shiny surface.' Which statement best supports this?
- A. Dark, rough surfaces are poor radiators
- B. Shiny surfaces absorb and emit heat better
- C. Dark, rough surfaces are good absorbers and emitters of heat
- D. All surfaces behave exactly the same
Answer: C. Dark, rough surfaces are good absorbers and emitters of heat
Dark and rough surfaces absorb and emit radiant heat more effectively than shiny surfaces.
Dark and rough surfaces absorb and emit radiant heat more effectively than shiny surfaces.