CBSE Class 7 Science Heat Transfer in Nature (Class 7 NCERT New) Quiz 8

1. Which tent is preferred in winter for warmth?

A Black tent B White tent C Any tent D Transparent tent

2. How does a thermos flask keep tea hot?

A By conduction B By convection C By reducing heat loss through insulation D By radiation

3. Which of these methods of heat transfer can occur without a medium?

A Conduction B Convection C Radiation D All of the above

4. Heat is best described as a form of what?

A light emitted from hot sources B force causing acceleration in objects C energy transferred between objects D matter in moving particles

5. Which term means the measure of how hot or cold something is?

A heat in a material B radiation from the Sun C conduction through solids D temperature of the object

6. Heat transfer through solids without bulk movement of particles is called what?

A convection moving fluids B radiation through empty space C conduction D evaporation changing state

7. Which process can transfer heat without any medium present?

A convection in liquids or gases B conduction through contact C infiltration into soil D radiation traveling as waves

8. Choose the odd one out: Copper, Iron, Aluminium, Plastic. Which material does not fit and why?

A Aluminium, it absorbs radiation poorly B Plastic, it is a poor conductor of heat C Copper, it does not conduct electricity D Iron, it is not a metal like others

9. During boiling, warm water rises because it becomes what compared to cooler water?

A denser than the cooler water B less conductive than the cooler water C less dense than the cooler water D more viscous than the cooler water

10. Sea breeze most commonly occurs when?

A in winter when oceans freeze B only during storms with strong winds C during the day due to land heating faster D at night due to land cooling faster