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 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
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
Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1oC and it is defined under which of the following conditions ?
From 14.5oC to 15.5oC at 760 mm of Hg
From 98.5oC to 99.5oC at 760 mm of Hg
From 13.5oC to 14.5oC at 76 mm of Hg
From 3.5oC to 4.5oC at 76 mm of Hg
What is the difference between the two principal specific heats of 1 g of helium gas at S.T.P. ? Given molecular weight of helium = 4 and J=4.186 J cal-1 and R=8.31 J mol-1 K-1 .
0.586 cal g-1 K-1
0.496 cal g-1 K-1
0.782 cal g-1 K-1
0.576 cal g-1 K-1
Three rods of identical cross-sectional area and made from the same metal form the sides of an isosceles triangle ABC, right-angled at B. The points A and B are maintained at temperatures T and (√2)T respectively. In the steady state, the temperature of the point C is TC. Assuming that only heat conduction takes place, TC/T is :
An ideal black body at room temperature is thrown into a furnace. It is observed that :
Initially, it is the darkest body and at later times the brightest.
It is the darkest body at all times.
It cannot be distinguished at all times.
Initially, it is the darkest body and at later times it cannot be distinguished.
On a hilly region, water boils at 95oC. Equivalent temperature in Fahrenheit is :
100oF
203oF
150oF
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
