The value of the coefficient of volume expansion of glycerine is \(5\times10^{-4} \mathrm{~K^{-1}}\). The fractional change in the density of glycerine for a rise of \(40^\circ \text{C}\) in its temperature is:
1. \(0.015\)
2. \(0.020\)
3. \(0.025\)
4. \(0.010\)

Subtopic:  Thermal Expansion |
 81%
From NCERT
NEET - 2015
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On observing light from three different stars \(P\), \(Q\), and \(R\), it was found that the intensity of the violet colour is maximum in the spectrum of \(P\), the intensity of the green colour is maximum in the spectrum of \(R\) and the intensity of the red colour is maximum in the spectrum of \(Q\). If \(T_P\)\(T_Q\), and \(T_R\) are the respective absolute temperatures of \(P\), \(Q\), and \(R\), then it can be concluded from the above observations that:
1. \(T_P>T_Q>T_R\)
2. \(T_P>T_R>T_Q\)
3. \(T_P<T_R<T_Q\)
4. \(T_P<T_Q<T_R\)

Subtopic:  Wien's Displacement Law |
 65%
From NCERT
NEET - 2015
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The two ends of a metal rod are maintained at temperatures \(100~^\circ\text{C}\) and \(110~^\circ\text{C}.\) The rate of heat flow in the rod is found to be \(4.0\) J/s. If the ends are maintained at temperatures \(200~^\circ \text{C}\) and \(210 ~^\circ \text{C},\) the rate of heat flow will be:
1. \(44.0\) J/s
2. \(16.8\) J/s
3. \(8.0\) J/s
4. \(4.0\) J/s

Subtopic:  Conduction |
 83%
From NCERT
NEET - 2015
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Liquid oxygen at \(50\) K is heated up to \(300\) K at a constant pressure of \(1\) atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

1. 2.
3. 4.
Subtopic:  Calorimetry |
 80%
From NCERT
AIPMT - 2012
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The freezer in a refrigerator is located at the top section so that
 

1.  the entire chamber of the refrigerator is cooled quickly due to convection
2.  the motor is not heated
3.  the heat gained from the environment is high
4.  the heat gained from the environment is low

Subtopic:  Convection |
 66%
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Assertion: It is hotter over the top of a fire than at the same distance of the side. 
Reason: Air surrounding the fire conducts, more heat upward.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Convection |
 66%
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In a new temperature scale, freezing point of water is given a value 10x and boiling point of water is 90x. Reading of new temperature scale for a temperature equal to 10°C is 

1.  14x

2.  16x

3.  18x

4.  12x

Subtopic:  Temperature and Heat |
 84%
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The temperature of a body on the Kelvin scale is found to be x K. When it is measured by a Fahrenheit thermometer, it is found to be x°F, then the value of x is:
1. 40

2. 313

3. 574.25

4. 301.25

Subtopic:  Temperature and Heat |
 71%
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A black body at \(227^{\circ}~\mathrm{C}\) radiates heat at the rate of \(7~ \mathrm{cal-cm^{-2}s^{-1}}\).  At a temperature of \(727^{\circ}~\mathrm{C}\), the rate of heat radiated in the same units will be:
1. \(60\)
2. \(50\)
3. \(112\)
4. \(80\)

Subtopic:  Stefan-Boltzmann Law |
 86%
From NCERT
AIPMT - 2009
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The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2 (T1> T2). The rate of heat transfer dQdt through the rod in a steady state is given by:

1. dQdt=KL(T1-T2)A

2. dQdt=K(T1-T2)LA

3. dQdt=KLA(T1-T2)

4. dQdt=KA(T1-T2)L

Subtopic:  Conduction |
 89%
From NCERT
AIPMT - 2009
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