A person weighing 60 kg taken in 2000 kcal diet in a day. If this energy were to be used in heating the person without any losses, what would be his rise in temperature ? (sp. heat of human body is 0.83 cal/gm/o C )
40.16o C
44.23o C
49.99o C
47.23o C
A black body at a temperature of 227oC radiates heat at the rate of 20 cal m-2s-1. When its temperature rises to 727oC, the rate of heat radiated will be :
40 cal m-2s-1
160 cal m-2s-1
320 cal m-2s-1
640 cal m-2s-1
An ungraduated thermometer of uniform bore is attached to a centimetre scale and is found to read 10.3 cm in melting ice, 26.8 cm in boiling water and 6.5 cm. in freezing mixture. The temperature of the freezing mixture will be :
-23.003o C
-23.03o C
-23.3o C
-23.33o C
Compared to burn due to air at 100oC, a burn due to steam at 100oC is :
More dangerous
Less dangerous
Equally dangerous
Can't be predicted
A body cools from 60°C to 50°C in 10min. If room temperature is 25°C , the temperature of the body at the end of next 10 min will be
38.5°C
42.8°C
40°C
45°C
Heat capacity of a body is infinite. It means
heat is given out
heat is taken in
no change in temperature whether heat is taken in or given out
All of these
Heat current is maximum in which of the following (rods are of identical dimension) ?
A constant volume air thermometer works on
Archemedes' principle
Boyle's law
Pascal's law
Gay Lussac's law
Water falls from a height of 500 m. What is the rise in temperature of water at the bottom if the whole energy is used up in heating water ?
0.96o C
1.02o C
1.16o C
0.25o C
A composite rod made of copper and steel is heated. Then :
It bends with steel on concave side
It bends with copper on concave side
It does not expand
Data is insufficient
