1. Shiny side, shiny side
2. Dull side, dull side
3. Shiny side, dull side
4. Dull side, shiny side
Dull side, shiny side
1. k1 > k2, where k is the thermal conductivity of the layer
2. k1 < k2
3. k1 = k2, but the heat flow through material 1 is larger than that through material 2
4. k1 = k2, but the heat flow through material 2 is less than that through material 2
k1 < k2
1. 0.030 C
2. 0.30 C
3. 30 C
4. 300 C
0.30 C
1. Insulting with materials whose thickness is blow that of critical thickness for insulation
2. Blowing air over it
3. Providing fans
4. Putting the heater pipe within another whose thermal conductivity is smaller in number and 2 inches thick
Blowing air over it
1. No change
2. Becomes 200 C
3. Increase
4. Decrease
Increase
1. Copper is less massive than aluminium
2. It takes more energy in the form of heat to change the temperature of aluminium than copper of equal mass
3. Aluminium can be kept at a higher temperature than copper of equal mass
4. CA/Ccu is higher at higher temperatures than lower temperatures
It takes more energy in the form of heat to change the temperature of aluminium than copper of equal mass
1. 300 C
2. 280 C
3. 260 C
4. 240 C
240 C
1. Both spheres will cool at the same rate for small values of T
2. Both spheres will cool at the same rate for all values of T
3. The hollow sphere will cool at faster rate for all values of T
4. The solid sphere will cool at faster rate for all the values of T
The solid sphere will cool at faster rate for all the values of T
1. Aluminium
2. Steel
3. Copper
4. Silver
Steel
1. Fewer numbers of thin fins
2. Fewer numbers of thick fins
3. Larger numbers of thin fins
4. Larger numbers of thick fins
Larger numbers of thin fins