If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of
2
4
8
16
Which of the following has the highest specific heat ?
copper
hydrogen
water
silver
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
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
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
A thermometer has wrong calibration. It reads the melting point of ice as - 10o C, the temperature of boiling point of water on this scale is :
-20o C
-40o C
-10o C
-10.7o C
Calorimeters are made of which of the following ?
glass
metal
wood
either (a) or (b)
During constant temperature, we feel colder on the day when the relative humidity is
85%
60%
50%
25%
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500o C and then placed on a large ice block. The maximum amount of ice that can melt is :(sp.heat of Cu = 0.39 J/gm/o C and heat of diffusion of water = 335 J/gm)
1.53 kg
1.50 kg
1.55 kg
1.6 kg
540 g of ice at 0o C is mixed with 540 g of water at 80o C. The final temperature of the mixture is
40o C
79.9o C
80o C
0o C