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%
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AIPMT - 2012
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A piece of ice falls from a height $$h$$ so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice, and all energy of ice gets converted into heat during its fall. The value of $$h$$ is: (Latent heat of ice is $$3.4\times10^5$$ J/kg and $$g=10$$ N/kg)

 1 $$544$$ km 2 $$136$$ km 3 $$68$$  km 4 $$34$$ km
Subtopic:  Calorimetry |
75%
From NCERT
NEET - 2016
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One kilogram of ice at $$0^\circ \mathrm{C}$$ is mixed with one kilogram of water at $$80^\circ \mathrm{C}.$$ The final temperature of the mixture will be: (Take: Specific heat of water = $$4200$$ J kg-1 K-1, latent heat of ice$$=336$$ kJ kg-1)
1. $$0^\circ \mathrm{C}$$
2. $$50^\circ \mathrm{C}$$
3. $$40^\circ \mathrm{C}$$
4. $$60^\circ \mathrm{C}$$

Subtopic:  Calorimetry |
73%
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5 g of water at $$30^{\circ} \mathrm{C}$$ and 5 g of ice at $$-20^{\circ} \mathrm{C}$$ are mixed together in a calorimeter. The water equivalent of the calorimeter is negligible, and the specific heat and latent heat of ice are 0.5 $$\text{cal/g}^{\circ} \mathrm{C}$$ and 80 $$\text{cal/g}$$, respectively. The final temperature of the mixture is:

 1 $$0^{\circ} \mathrm{C}$$ 2 $$-8^{\circ} \mathrm{C}$$ 3 $$-4^{\circ} \mathrm{C}$$ 4 $$2^{\circ} \mathrm{C}$$
Subtopic:  Calorimetry |
72%
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Steam at $$100^{\circ}\mathrm{C}$$ is injected into 20 g of $$10^{\circ}\mathrm{C}$$ water. When water acquires a temperature of $$80^{\circ}\mathrm{C}$$, the mass of water present will be: (Take specific heat of water =1 cal g-1 $$^\circ$$C-1 and latent heat of steam = 540 cal g-1)
1. 24 g
2. 31.5g
3. 42.5 g
4. 22.5 g

Subtopic:  Calorimetry |
71%
From NCERT
NEET - 2014
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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%
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In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at $$150^{\circ}\mathrm{C}$$ is dropped in a copper calorimeter (of water equivalent of 0.025 kg) containing 150 $$c m^{3}$$ of water at $$27^{\circ}\mathrm{C}$$. The final temperature is $$40^{\circ}\mathrm{C}$$. The specific heat of the metal will be: (Heat   losses   to   the   surroundings   are   negligible)
1. $$0 . 40 ~ \text{Jg}^{- 1} \text{K}^{- 1}$$

2. $$0 . 43 ~ \text{Jg}^{- 1} \text{K}^{- 1}$$
3. $$0 . 54 ~ \text{Jg}^{- 1} \text{K}^{- 1}$$
4. $$0 . 61 ~ \text{Jg}^{- 1} \text{K}^{- 1}$$

Subtopic:  Calorimetry |
60%
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