Two Different Metal Rods Of The Same Length Have Their Ends Kept At The Same Temperatures and  with . If A and B are Their Cross-sectional Areas And k1 and k2 their Thermal Conductivities, The Rate Of Flow Of Heat In The Two Rods Will Be The Same If

300 g of water at 25^oC is added to 100 g of ice at 0^oC. The final temperature of the mixture is

100 g of ice at 0^oC is mixed with 100 g of water 80^oC. The final temperature of the mixture will be

Steam at 100^oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15^oC till the temperature of the calorimeter rises to 80^oC. The mass of steam condensed in kilogram is

If there are no heat losses, the heat released by the condensation of xgrams of steam at 100^oC into water 100^oC converts y grams of ice at 0^oC into water at 100^oC. The ratio y/x is nearly

One mole of oxygen is heated from 0^oC, at constant pressure, till its volume increases by 10%. The specific heat of oxygen, under these conditions is 0.22 cal g ^{– 1} K ^{– 1}. The amount of heat required (in joules) is

A drilling machine of power P watts is used to drill a hole in copper block of mass M kg. If the specific heat of a copper is s J  and 40% of  the power is lost due to heating of the machine, the rise in the temperature of the block in T seconds will be (in ^oC)

A geyser, operating on LPG (liquefied petroleum gas) heats water flowing at the rate of 3.0 litres per minute, from 27^oC to 77^oC. If the heat of combustion of LPG is , how much fuel in grams is consumed per minute?

A copper block of mass 2 kg is heated to a temperature of 500^oC and then placed in a large block of ice at 0^oC. What is the maximum amount of ice that can melt? The specific heat of copper is 400 j  and latent heat of fusion of water is .

The dimensions of the coefficient of thermal conductivity are

Two rods A and B of different materials are welded together as shown in Fig. If their thermal conductivities are k₁ and k₂ , the thermal conductivity of the composite rod will be