CBSE Class 11 Transfer of Heat Worksheet C

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1. If air is a bad conductor of heat, why do we not feel warm without clothes?

2. A body with large reflectivity is a poor emitter why?

3. Animals curl into a ball, when they feel very cold?

4. Why is it hotter at the same distance over the top of the fire than in front of it?

5. A metal rod of length 20cm and diameter 2cm is covered with a non-conducting substance. One of it ends is maintained at 100°c while the other is at 0°c. It is found that 25g of ice melts in 5 min calculate coefficient of thermal conductivity of metal?

6. Calculate the temperature in Kelvin at which a perfectly black body radiates at the rate of 5.67 w/cm²?

7. How do you derive Newton’s law of cooling from Stefan’s law?

 8. Define the terms reflectance, absorptance and transmittance. How are they related?                

9. Discuss briefly energy distribution of a black body radiation. Hence deduce wien’s displacement law? 

Click on link below to download CBSE Class 11 Transfer of Heat Worksheet C.