One kilogram of ice at 0°C is mixed with one kilogram of water at 80°C. The final tem perature of the mixture is (Take Specific heat of water 4200 Jkg1 k-1, Latent heat of ice 336 kJ kg) (A) 0°C (C) 40°C (B) 50°C (D) 60°C

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80 g of water at 30°C is poured on a large of ice at 0°C. The mass of ice that melts is -

1.  15 g

2.  30 g

3.  50 g

4  60 g

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The fastest mode of heat transfer is 

1.  Conduction

2.  Radiation

3.  Convection

4.  all are  equally fast

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A temperature of 100°F Farenhiet scale is equal to TK Kelvin scale. The value of T is

1.  310.9

2.  37.8

3.  100

4.  122.4

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A black body at temperature 300K radiates heat at the rate E. If its temperature is increased by 600K, the rate of radiation will increase to -

1.  16E

2.  64E

3.  81E

4.  256E

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A body cools down from 80°C to 70°C in 5 minutes. the temperature of the body will fall from 70°C to 60°C in a time

1.  Less than 5 minutes

2.  equal to 5 minutes

3.  More than 5 minutes

4.  Can't say anything like the temperature of surrounding is not known

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If λm is the wavelength, corresponding to which the radiant intensity of a block body is maximum and its absolute temperature is T. Whichof the following graph correctly represents the variation of λm with T1.  

2.  

3.  

4.  

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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

 

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Hot water cools from 60° C to 50°C in first 10 minutes and 42° C in next 10 minutes. The temperature of surrounding is:

1.  5° C 

2.  10° C 

3.  15° C  

4.  20°C

 

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