A copper rod of $$88$$ cm and an aluminium rod of an unknown length have an equal increase in their lengths independent of an increase in temperature. The length of the aluminium rod is: $$\left(\alpha_{Cu}= 1.7\times10^{-5}~\text{K}^{-1}~\text{and}~\alpha_{Al}= 2.2\times10^{-5}~\text{K}^{-1}\right)$$ 1. $$68~\text{cm}$$ 2. $$6.8~\text{cm}$$ 3. $$113.9~\text{cm}$$ 4. $$88~\text{cm}$$

Subtopic:  Thermal Expansion |
76%
From NCERT
NEET - 2019
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A substance is in solid form at $$0^{\circ}\mathrm{C}$$. The amount of heat added to this substance and its temperature are plotted in the following graph. If the relative specific heat capacity of the solid substance is 0.5, from the graph, the specific latent heat of the melting process is: (Specific heat capacity of water = 1000 cal kg-1 K-1 )

 1 60000 cal kg-1 2 40000 cal kg-1 3 10000 cal kg-1 4 20000 cal kg-1
Subtopic:  Calorimetry |
65%
From NCERT
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Some water at $$0^{\circ}\mathrm{C}$$ is placed in a large insulated enclosure (vessel). The water vapour formed is pumped out continuously. What fraction of the water will eventually freeze, if the latent heat of vaporization is seven times the latent heat of fusion?

 1 7/8 2 8/7 3 3/8 4 5/8
Subtopic:  Calorimetry |
58%
From NCERT
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On a new scale of temperature, which is linear and called the $$\mathrm{W}$$ scale, the freezing and boiling points of water are $$39^\circ ~\mathrm{W}$$and $$239^\circ ~\mathrm{W}$$ respectively. What will be the temperature on the new scale corresponding to a temperature of $$39^\circ ~\mathrm{C}$$ on the Celsius scale?
1. $$78^\circ ~\mathrm{C}$$
2. $$117^\circ ~\mathrm{W}$$
3. $$200^\circ ~\mathrm{W}$$
4. $$139^\circ ~\mathrm{W}$$

Subtopic:  Temperature and Heat |
83%
From NCERT
AIPMT - 2008
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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%
From NCERT
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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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If the radius of a star is $$R$$ and it acts as a black body, what would be the temperature of the star at which the rate of energy production is $$Q$$?
1. $$\frac{Q}{4\pi R^2\sigma}$$
2. $$\left(\frac{Q}{4\pi R^2\sigma}\right )^{\frac{-1}{2}}$$
3. $$\left(\frac{4\pi R^2 Q}{\sigma}\right )^{\frac{1}{4}}$$
4. $$\left(\frac{Q}{4\pi R^2 \sigma}\right)^{\frac{1}{4}}$$

Subtopic:  Stefan-Boltzmann Law |
83%
From NCERT
AIPMT - 2012
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A body cools from a temperature of $$3T$$ to $$2T$$ in $$10$$ minutes. The room temperature is $$T$$. Assuming that Newton's law of cooling is applicable, the temperature of the body at the end of the 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 |
72%
From NCERT
NEET - 2016
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The rate of heat emission from an ideal black body at temperature T is H. What will be the rate of emission of heat by another body of same size at temperature 2T and emissivity 0.25?

 1 16 H 2 4 H 3 8 H 4 4.5 H
Subtopic:  Stefan-Boltzmann Law |
78%
From NCERT
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Two slabs A and B of equal surface area are placed one over the other such that their surfaces are completely in contact. The thickness of slab A is twice that of B. The coefficient of thermal conductivity of slab A is twice that of B. The first surface of slab A is maintained at $$100^{\circ}\mathrm{C}$$$,$ while the second surface of slab B is maintained at $$25^{\circ}\mathrm{C}$$. The temperature at the common surface will be:
1. $$62.5^{\circ}\mathrm{C}$$
2. $$45^{\circ}\mathrm{C}$$
3. $$55^{\circ}\mathrm{C}$$
4. $$85^{\circ}\mathrm{C}$$

Subtopic:  Conduction |
72%
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