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
Which of the following has the highest specific heat ?
copper
hydrogen
water
silver
A black body radiates heat energy at the rate of 2 × 105 J/s/m2 at a temperature of 127°C. The temperature of black body at which the rate of radiation is 32 × 105 J/s/m2 is
527°C
273°C
873°C
927°C
A sphere is at a temperature of 600K. Its cooling rate is R' in an external environment of 200 K. If temperature falls to 400 K, then cooling rate R' will be
3R/16
16R/3
9R/27
none of these
The volume of a liquid is 830 m3 at 30o C and it is 850 m3 at 90o C. The coefficient of volume expansion of the liquid is
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
The radiator of a car contains 20 litre of water. If the motor supplies calorie heat to it, then rise in temperature will be :
10o C
20o C
100o C
103 oC
Calorimeters are made of which of the following ?
glass
metal
wood
either (a) or (b)
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
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
