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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:$\mathrm{}$

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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Steam at \(100~^{\circ}\mathrm{C}\) is passed into \(20~\text{g}\) of water at \(10~^{\circ}\mathrm{C}\). When water acquires a temperature of \(80~^{\circ}\mathrm{C}\), the mass of water present will be:

[Take specific heat of water \(= 1~\text{cal g}^{-1}~^\circ\mathrm{C}^{-1}\) and latent heat of steam \(= 540~\text{cal g}^{-1}\)]

1. \(24~\text{g}\)

2. \(31.5~\text{g}\)

3. \(42.5~\text{g}\)

4. \(22.5~\text{g}\)

Subtopic: Calorimetry |

69%

From NCERT

AIPMT - 2014

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A certain quantity of water cools from \(70~^{\circ}\text{C}\) to \(60~^{\circ}\text{C}\) in the first \(5\) minutes and to \(54~^{\circ}\text{C}\) in the next \(5\) minutes. The temperature of the surroundings is:

1. \(45~^{\circ}\text{C}\)

2. \(20~^{\circ}\text{C}\)

3. \(42~^{\circ}\text{C}\)

4. \(10~^{\circ}\text{C}\)

Subtopic: Newton's Law of Cooling |

76%

From NCERT

AIPMT - 2014

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A piece of iron is heated in a flame. It first becomes dull red, then becomes reddish yellow and finally turns to white-hot. The correct explanation for the above observation is possible by using:

1. Wien’s displacement Law

2. Kirchoff’s Law

3. Newton’s Law of cooling

4. Stefan’s Law

2. Kirchoff’s Law

3. Newton’s Law of cooling

4. Stefan’s Law

Subtopic: Wien's Displacement Law |

82%

From NCERT

AIPMT - 2013

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Two metal rods \(1\) and \(2\) of same lengths have the same temperature difference between their ends. Their thermal conductivities are \({K}_1\)_{ }and \({K}_2\)_{ }and cross-sectional areas \({A}_{1}\) and \({A}_{2},\) respectively. If the rate of heat conduction in \(1\) is four times that in \(2,\) then:

1. \(K_1 A_1=4K_2 {A}_2 \)

2. \(K_1 {A}_1=2 {K}_2 {A}_2 \)

3. \(4 {K}_1{A}_1={K}_2 {A}_2 \)

4. \({K}_1 {A}_1={K}_2 {A}_2\)

1. \(K_1 A_1=4K_2 {A}_2 \)

2. \(K_1 {A}_1=2 {K}_2 {A}_2 \)

3. \(4 {K}_1{A}_1={K}_2 {A}_2 \)

4. \({K}_1 {A}_1={K}_2 {A}_2\)

Subtopic: Conduction |

75%

From NCERT

NEET - 2013

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The density of water at \(20^\circ \text{C}\) is \(998\) kg/m^{3} and at \(40^\circ \text{C}\) is \(992\) kg/m^{3}. The coefficient of volume expansion of water is:

1. \(3 \times 10^{-4} / ^\circ\text C\)

2. \(2 \times 10^{-4} / ^\circ\text C\)

3. \(6 \times 10^{-4} / ^\circ\text C\)

4. \(10^{-4} / ^\circ\text C\)

1. \(3 \times 10^{-4} / ^\circ\text C\)

2. \(2 \times 10^{-4} / ^\circ\text C\)

3. \(6 \times 10^{-4} / ^\circ\text C\)

4. \(10^{-4} / ^\circ\text C\)

Subtopic: Thermal Expansion |

71%

From NCERT

NEET - 2013

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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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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 |

81%

From NCERT

AIPMT - 2012

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