Q. No.One kilogram of ice at 0°0°C is mixed with one kilogram of water at 80°C°C. The final temperature of the mixture is (Take: Specific heat of water = 4200 J kg-1C-1kg−1C−1, Latent heat of ice = 336 kJ kg-1kg−1)
1. 0°0°C
2. 50°C50°C
3. 40°C40°C
4. 60°C60°C
The fastest mode of heat transfer is
1. Conduction
2. Radiation
3. Convection
4. all are equally fast
A temperature of 100∘F100∘F (Fahrenheit scale) is equal to T KT K (Kelvin scale). The value of TT is:
1. 310.9310.9
2. 37.837.8
3. 100100
4. 122.4122.4
1. 16E16E
2. 64E64E
3. 81E81E
4. 256E256E
A body cools down from 80∘C80∘C toto 70∘C70∘C
| 1. | less than 5 minutes. |
| 2. | equal to 5 minutes. |
| 3. | more than 5 minutes. |
| 4. | can't say anything as the temperature of the surroundings is not known. |
If λmλm is the wavelength, corresponding to which the radiant intensity of a block is at its maximum and its absolute temperature is T,T, then which of the following graphs correctly represents the variation of T?T?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Heat capacity is equal to the product of:
1. mass and gas constant
2. mass and specific heat
3. latent heat and volume of water
4. mass and Avogadro number
When a block of iron floats in Hg at 0°C0°C, a fraction K1K1 of its volumen= is submerged, while at temperature of 60°C60°C a fraction K2K2 is seen to be submersed. If the coefficient of volume expansion of iron is γFeγFe and that of mercury is γHgγHg, then the ratio K1K2K1K2 can be expressed as:
1. 1+60γFe1+60γHg1+60γFe1+60γHg
2. 1-60γFe1+60γHg1−60γFe1+60γHg
3. 1+60γFe1-60γHg1+60γFe1−60γHg
4. 1+60γHe1-60γFe1+60γHe1−60γFe
Hot water cools from 60°C to 50°C in first 10 minutes and from 50°C to 42°C in next 10 minutes. The temperature of surrounding is :
1. 5° C
2. 10° C
3. 15° C
4. 20°C
A pendulum clock runs faster by 5 s per day at 20∘C and goes slow by 10 s per day at 35∘C. It shows the correct time at a temperature of:
1. 27.5∘C
2. 25∘C
3. 30∘C
4. 33∘C
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