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Important questions on Heat Capacity

HARD

After the tea is added to the thermos, the temperature of the liquid quickly falls from to as reaches thermal equilibrium with the thermos flask
What is the heat capacity of the thermos?

A

B

C

D

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HARD

The value of is 1:00 R for a gas sample in state A and is 1.08 R in state B. Let denote the pressures and denote the temperature of the states and respectively.Most likely

A

B

C

D

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HARD

Equal heat is gives to two objects A and B of mass 1 g. Temperature of A increases by and B by . Which object has more specific heat? And by what factor?

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HARD

If, after some of the tea has been transferred to the thermos (as described in the passage), the teapot with its contents (at a temperature of ) was placed or the insulated warmer for minutes, what would be the temperature at the end of this minutes period (Assume that no significant heat transfer occurs with the surrounding):

A

B

C

D

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HARD

Two moles of an ideal gas with are mixed with moles of another ideal gas with . The value of for the mixture is :

A

B

C

D

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HARD

What is the final temperature of the system ?

A

B

C

D

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HARD

An engineer is developing an electric water heater to provide a continuous supply of hot water . One trial design is shown in Fig. 1B.14 . Water is flowing at the rate of , the inlet thermometer registers , the voltmeter reads , and the ammeter reads ( corresponding to a power input of ) . (a) When a steady state is finally reached , what is the reading of the outlet thermometer ? (b) Why is it unnecessary  to take into account the heat capacity of the apparatus itself ? 

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HARD

An alternative method for keeping the tea hot would be to place the teapot on a pound block that has been heated in an oven to . A block of which of the following substance would best  be able to keep the tea hot?

A

copper (specific heat )

B

granite (specific heat )

C

iron (specific heat )

D

pewter (specific heat )

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HARD

 An immersion heater, in an insulated vessel of negligible heat capacity, brings 100 g of water to the boiling point from in 7 min. Then
         Power of heater is nearly

A

B

C

cal/s

D

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HARD

A solid aluminium sphere and a solid lead sphere of the same radius are heated to the same temperature and allowed to cool under identical surrounding temperatures. The specific heat capacity of aluminium = and that of the lead = . The density of lead = and that of aluminum = . Assume that the emissivity of both the
spheres is the same

   When the temperature of spheres T is not too different from the surrounding temperature, the radiating object obeys

A

Stefan-Boltzmann law

B

Newton's law of cooling

C

Dulong-Petit law

D

Planck's law

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