One kilogram of ice at 0°C is mixed with one kilogram of water at 80°C. The final temperature of the mixture is (Take: Specific heat of water = 4200 J kg-1k-1, Latent heat of ice = 336 kJ kg-1)

(1) 0°C              (2) 50°C

(3) 40°C           (4) 60°C

Concept Questions :-

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The fastest mode of heat transfer is 

1.  Conduction

2.  Radiation

3.  Convection

4.  all are  equally fast

Concept Questions :-

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

1.  310.9

2.  37.8

3.  100

4.  122.4

Concept Questions :-

Temperature scales
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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

Concept Questions :-

Newton's law of cooling
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If λm is the wavelength, corresponding to which the radiant intensity of a block is maximum and its absolute temperature is T. Which of the following graph correctly represents the variation of λm with T.

1.    2.  

3.   4.  

Concept Questions :-

Wien displacement law
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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

 

Concept Questions :-

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When a block of iron floats in Hg at 0°C, a fraction K1 of its volumen= is submerged, while at temperature of 60°C a fraction K2 is seen to be submersed. If the coefficient of volume expansion of iron is γFe and that of mercury is γHg, then the ratio K1K2 can be expressed as:

(1) 1+60γFe1+60γHg

(2) 1-60γFe1+60γHg

(3) 1+60γFe1-60γHg

(4) 1+60γHe1-60γFe

Concept Questions :-

Thermal expansion
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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

 

Concept Questions :-

Newton's law of cooling
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If αc and αf denote the numerical values of coefficient of linear expansion of a solid, expressed  per °C and per °F respectively, then

1.  αc > αf  

2.  αf > αc 

3.  αf = αc  

4.  αf + αc = 0

 

Concept Questions :-

Thermal expansion
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