CBSE Class 11 Transfer of Heat Worksheet A

Download free printable worksheets for your students. All worksheets are in pdf format with the answers on the next page. Please give the questions to the child and then compare answers with the suggested answers provided by us. Free worksheets with questions and answers are available for all subjects. Use the worksheets to get better marks in tests and exams.

1. On a winter night, you feel warmer when clouds cover the sky than when sky is clear. Why?

2. If a body is heated from 27° C to 927°C then what will be the ratio of energies of radiation emitted?

3. Two rods A and B are of equal length. Each rod has its ends at temperatures T₁ and T₂. What is the condition that will ensure equal rates of flow of heat through the rods A and B?

4. A layer of ice 10cm thick is formed on a pond. The temperature of air is – 10°C. Calculate how long it will take for the thickness of ice to increase by 1mm.

Density of ice = 1g|cm³; Thermal conductivity of ice = 0.005Cal|s|cm|0C; Latent heat of ice = 80Cal|g?

 5. Two conducting slabs of thermal conductivities K₁ and K₂ are joined as shown in the figure. The temperature of

the ends of slab are θ ₁and θ₂ (θ₁ > θ₂). Find the final temperature of (θm)?

6. The ends of the two rods of different materials with their thermal conductivities, radii of cross – section and length in the ratio 1:2 are maintained at the same temperature difference. If the rate of flow of heat through the larger rod is 4 cal |s, what is the rate of flow through the shorter rod?

7. What are thermal radiation? Write its properties of thermal radiation?

8. An indirectly heated filament is radiating maximum energy of wavelength 2.16x10^-7m. Find the net amount of heat energy lost per second per unit area, the temperature of surrounding air is 13°C. Given b = 2.88x10^-3 mk, σ = 5.77x10^-8 J|s|m2|k⁴?

9. Animals in the forest find shelter from cold in holes in the snow. Why?

10. A brass boiler has a base area of 0.15m² and thickness 1.0cm. It boils water at the rate of 6kg| min when placed on a gas stove, Estimate the temperature of the part of flame in contact with the boiler. Thermal conductivity of brass = 109J|s|m|°C, heat of vaporization of water = 2256J|g? 

11. How do you explain heating of rooms based on principle of convection? 

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