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
Two metallic spheres S1 and S2 are made of the same material and have got identical surface finish. The mass of S1 is thrice that of S2. Both spheres are heated to same high temperature and placed in the same room having lower temperature . The ratio of the initial rate of cooling of S1 to that of S2 is:
1/3
For a gas, the difference between two principal specific heats is 4150 J kg-1 K-1 . What is the specific heat of the gas at constant volume if the ratio of specific heats is 1.4 ?
5186 J kg-1 K-1
10375 J kg-1 K-1
1060 J kg-1 K-1
8475 J kg-1 K-1
Compared to burn due to air at 100oC, a burn due to steam at 100oC is :
More dangerous
Less dangerous
Equally dangerous
Can't determine
Let 50 g of ice at 0oC is mixed with 50 g of water at 80oC, final temperature of mixture of will be:
0oC
40oC
60oC
4oC
Temperature of a black body increases from 327oC to 927oC, the initial energy possessed is 2 kJ. What is its final energy ?
32 kJ
320 kJ
1200 kJ
32 J
Two spheres of the same material have radii 1 m and 4 m and temperatures 4,000 K and 2,000 K respectively. The ratio of the energy radiated per second by the first sphere to that by the second is:
1 : 1
1 : 9
4 : 1
16 :1
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
One end of a thermally insulated rod is kept at a temperature T1 and the other at T2. The rod is composed to two sections of lengths L1 and L2 and the coefficients of thermal conductivity K1 and K2respectively. The temperature at the interface of the two sections is:
If the temperature of the sun increases from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously, will be:
4
16
32
64
