Expansion During Heating: 

Which of the following produces more servere burns? 

A body cools from 91^oC to 89^oC in 5 minutes when the room temperature is 20^oC. Then it will cool from 71^oC to 69^oC in:   

Three liquids with masses m₁, m₂, m₃ are thoroughly mixed. If their specific heats are s₁, s₂, s₃ and their temperature θ₁, θ₂, θ₃ respectively, then the temperature of the mixture is:    

80 gm of water at 30^oC is poured on a large block of ice at 0^oC. The mass of ice that melts is:

250 gm of water and equal volume of alcohol of mass 200 gm are replaced successively in the same calorimeter and cool from 60^oC to 55^oC in 130 seconds and 67 seconds respectively. If the water equivalent of the calorimeter is 10 gm, then the specific heat of alcohol in cal/gm-^oC is:   

The sprinkling of water reduce the temperature of a closed room because: 

Two bars of copper having same length but unequal diameter are heated to the same temperature. The change in length will be:  

The beaker is completely filled with water at 4^oC. It will overflow:

When a metal rod is heated it expands because: 

Two rods of lengths L₁ and L₂ are made of materials whose coefficients of linear expansion are α₁ and α₂. If the difference between the two lengths is independent of temperature: