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 $k{g}^{-1}{C}^{-1}$, Latent heat of ice = 336 kJ $k{g}^{-1}$)

(1) $0°$C              (2) $50°C$

(3) $40°C$           (4) $60°C$

Subtopic:  Calorimetry |
65%
From NCERT
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The fastest mode of heat transfer is

1.  Conduction

3.  Convection

4.  all are  equally fast

71%
From NCERT
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A temperature of $$100^{\circ}\text {F}$$ (Fahrenheit scale) is equal to $$T~\text{K}$$ (Kelvin scale). The value of $$T$$ is:
1. $$310.9$$
2. $$37.8$$
3. $$100$$
4. $$122.4$$

Subtopic:  Temperature and Heat |
74%
From NCERT
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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

From NCERT
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A body cools down from $$80^{\circ}\mathrm{C}$$ $\mathrm{to}$ $$70^{\circ}\mathrm{C}$$ in 5 minutes. The temperature of the same body will fall from $$70^{\circ}\mathrm{C}$$$\mathrm{}$ $\mathrm{to}$ $$60^{\circ}\mathrm{C}$$$\mathrm{}$ in:

 1 less than 5 minutes. 2 equal to 5 minutes. 3 more than 5 minutes. 4 can't say anything as the temperature of the surroundings is not known.

Subtopic:  Newton's Law of Cooling |
63%
From NCERT
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If ${\lambda }_{m}$ is the wavelength, corresponding to which the radiant intensity of a block is at its maximum and its absolute temperature is T, then which of the following graph correctly represents the variation of T?

 1 2 3 4

Subtopic:  Wien's Displacement Law |
74%
From NCERT
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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

Subtopic:  Calorimetry |
90%
From NCERT
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When a block of iron floats in Hg at $0°C$, a fraction ${K}_{1}$ of its volumen= is submerged, while at temperature of $60°C$ a fraction ${K}_{2}$ is seen to be submersed. If the coefficient of volume expansion of iron is ${\gamma }_{Fe}$ and that of mercury is ${\gamma }_{Hg}$, then the ratio $\frac{{K}_{1}}{{K}_{2}}$ can be expressed as:

1. $\frac{1+60{\gamma }_{Fe}}{1+60{\gamma }_{Hg}}$

2. $\frac{1-60{\gamma }_{Fe}}{1+60{\gamma }_{Hg}}$

3. $\frac{1+60{\gamma }_{Fe}}{1-60{\gamma }_{Hg}}$

4. $\frac{1+60{\gamma }_{He}}{1-60{\gamma }_{Fe}}$

Subtopic:  Thermal Expansion |
51%
From NCERT
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Hot water cools from 60$°\mathrm{C}$ to 50$°\mathrm{C}$ in first 10 minutes and from 50$°\mathrm{C}$ to 42$°\mathrm{C}$ in next 10 minutes. The temperature of surrounding is :

1.

2.

3.

4.  $20°\mathrm{C}$

Subtopic:  Newton's Law of Cooling |
77%
From NCERT
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A pendulum clock runs faster by 5 seconds per day at $$20^{\circ}\mathrm {C}$$ and goes slow by 10 second 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%
From NCERT
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