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

Subtopic:  Thermal Expansion |
 51%
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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

 

Subtopic:  Newton's Law of Cooling |
 77%
From NCERT
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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

Subtopic:  Thermal Expansion |
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A pendulum clock runs faster by \(5\) s per day at \(20^{\circ}\mathrm {C}\) and goes slow by \(10\) s per day at \(35^{\circ}\mathrm {C}\). It shows the correct time at a temperature of:
1. \(27.5^{\circ}\mathrm {C}\)
2. \(25^{\circ}\mathrm {C}\)
3. \(30^{\circ}\mathrm {C}\)
4. \(33^{\circ}\mathrm {C}\)

Subtopic:  Thermal Expansion |
 66%
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The temperature of a body on Kelvin scale is found to be X K. When it is measured by a Fahrenheit thermometer, it is found to be X0F. Then X is

1. 301.25

2. 574.25

3. 313

4. 40

Subtopic:  Temperature and Heat |
 67%
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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

 

Subtopic:  Calorimetry |
 90%
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If 32 gm of \(O_2\) at \(27^{\circ}\mathrm{C}\) is mixed with 64 gm of \(O_2\) at \(327^{\circ}\mathrm{C}\) in an adiabatic vessel, then the final temperature of the mixture will be:
1. \(200^{\circ}\mathrm{C}\)
2. \(227^{\circ}\mathrm{C}\)
3. \(314.5^{\circ}\mathrm{C}\)
4. \(235.5^{\circ}\mathrm{C}\)

Subtopic:  Molar Specific Heat |
 68%
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Two rods, A and B, of different materials having the same cross-sectional area are welded together as shown in the figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be:

   

1. K1+K22
2. 3K1+K22
3. K1+K2
4. 2K1+K2

Subtopic:  Conduction |
 79%
From NCERT
NEET - 2017
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Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100° C, while the other one is at 0° C. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is -

1. 50° C

2. more than 50°C

3. less than 50°C but greater than 0°C

4.  0 C0

Subtopic:  Calorimetry |
 56%
From NCERT
NEET - 2016
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A body cools from a temperature 3T to 2T in10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be:
1. \(\frac{7}{4}T\)
2. \(\frac{3}{2}T\)
3. \(\frac{4}{3}T\)
4. \(T\)

Subtopic:  Newton's Law of Cooling |
 71%
From NCERT
NEET - 2016
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