One kilogram of ice at C is mixed with one kilogram of water at 80. The final temperature of the mixture is (Take: Specific heat of water = 4200 J , Latent heat of ice = 336 kJ )
(1) C (2)
The fastest mode of heat transfer is
4. all are equally fast
A temperature of 100 oF (Fahrenheit scale) is equal to T K (Kelvin scale). The value of T is:
A black body at temperature 300K radiates heat at the rate E. If its temperature is increased by 600K, the rate of radiation will increase to -
A body cools down from in 5 minutes. The temperature of the body will fall from in a time:
1. less than 5 minutes.
2. equal to 5 minutes.
3. more than 5 minutes.
4. can't say anything like the temperature of surroundings is not known.
If is the wavelength, corresponding to which the radiant intensity of a block is maximum and its absolute temperature is T. Which of the following graph correctly represents the variation of with T.
Heat capacity is equal to the product of:
1. mass and gas constant
2. mass and specific heat
3. latent heat and volume of water
4. mass and Avogadro number
When a block of iron floats in Hg at , a fraction of its volumen= is submerged, while at temperature of a fraction is seen to be submersed. If the coefficient of volume expansion of iron is and that of mercury is , then the ratio can be expressed as:
Hot water cools from 60 to 50 in first 10 minutes and from 50 to 42 in next 10 minutes. The temperature of surrounding is :
A pendulum clock runs fast by 5 sec per day at 20 oC and goes slow by 10 sec/day at 35 oC. It shows the correct time at a temperature of:
1. 27.5 oC
2. 25 oC
3. 30 oC
4. 33 oC