MCQ
Name a medium which is a good insulator of heat:
- ✓Still (or trapped) air
- BOil
- CSteam
- DSolid copper
✓
Answer
Correct option: A.
Still (or trapped) air
Trapped (still) air is good insulator.
Thermal conductivity of air is small as compared to solid and liquid. Eg- glass conducts $30$ times more power per unit distance per unit temperature than air.
The less dense the material, the less thermal conductivity. And gas (air) is least dense than solid and liquid.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
All changes taking place in the atmosphere are caused by the $.........$
→Electric door bell employs:
Pitcher plant falls in the category of:
Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in Fig.
Who will be able to see the candle flame clearly?
Who will be able to see the candle flame clearly?
Human beings can be categorised as
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?
An adolescent girl notices that she has been getting tired easily, looks pale, and often feels dizzy. Which of the following combinations is most likely lacking in her diet?
By which of the following ways does food helps living organisms?
The process of rusting requires:
Choose the material that is a good conductor of electricity: