The specific heat capacity of a substance A is 3 , 800 J kg - 1 K - 1 and that of a substance B is 400 J kg - 1 K - 1 . Which of the two substances is a good conductor of heat? Give a reason for your answer.

The specific heat capacity of a body is the amount of heat required to increase the temperature of a unit mass of that body through 1 ° C or 1 K . So substance B is a good conductor of heat because its specific heat capacity is low, due to this it takes less heat to raise its temperature and transfer more amount of heat through it compared to substance A . All the conductors will have less specific heat capacity.

EASY

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What happens to mass of substance when it's heated?

Important Questions on Heat and Temperature

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

A calorimeter of water equivalent

20 g

contains

180 g

of water at

25 ° C

{}^{'}m^{'}

' grams of steam at

100 ° C

is mixed in it till the temperature of the mixture is

31 ° C

. The value of

m

is close to (Latent heat of water

= 540 cal g^{- 1}

, specific heat of water

= 1 cal g^{- 1 °} C^{- 1}

)

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

200 g

water is heated from

40^{o} C

60^{o} C

. Ignoring the slight expansion of water, the change in its internal energy is close to (Given specific heat of water

= 4184

J {kg}^{- 1} K^{- 1}

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid? Give one example to support your answer.

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

The specific heat capacity of body depends on

HARD

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

The figure below shows the variation of specific heat capacity ( $C$ ) of a solid as a function of temperature ( $T$ ). The temperature is increased continuously from $0$ to $500 K$ at a constant rate. Ignoring any volume change, the following statement (s) is (are) correct to a reasonable approximation.

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MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Steam at

100 ° C

is passed into

1.1 kg

of water contained in a calorimoter of water equivalent to

0.2 kg

15 ° C

till the temperature of the calorimeter and its contents rises to

80 ° C

. The mass of steam condensed (in

kg

) is

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

The specific heat capacity of a substance

A

3, 800 J {kg}^{- 1} K^{- 1}

and that of a substance

B

400 J {kg}^{- 1} K^{- 1}

. Which of the two substances is a good conductor of heat? Give a reason for your answer.

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Why does stone lying in the sun get heated up much more than water lying for the same duration of time?

HARD

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

20 g

bullet whose specific heat is,

5000 J {kg}^{- 1} {}^{\circ}C^{- 1}

and moving at,

2000 m s^{- 1}

plunges into a

1.0 kg

block of wax whose specific heat is,

3000 J {kg}^{- 1} {}^{\circ}C^{- 1}

. Both bullet and wax are at,

25 ° C

and assume that

(i)

the bullet comes to rest in the wax and

(ii)

all its kinetic energy goes into heating the wax. The thermal temperature of the wax in,

{}^{\circ}C

is close to.

HARD

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

1 kg

of ice at

- 20^{o} C

is mixed with

2 kg

of water at

90^{o} C

. Assuming that there is no loss of energy to the environment, what will be the final temperature of the mixture? (Assume latent heat of ice

= 334.4 kJ {(kg)}^{- 1}

, specific heat of water and ice are

4.18 kJ {(kg - K)}^{- 1}

and

2.09 kJ {(kg - K)}^{- 1}

, respectively.)

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Boiling water is changing into steam. The specific heat of boiling water is

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

An experiment takes

10 \min

to raise the temperature of water in a container from

0^{o} C

100^{o} C

and another

55 \min

to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking specific heat of the water to be

1 cal {(g^{\circ} C)}^{- 1}

, the heat of vaporization according to this experiment will come out to be:

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

What is specific heat capacity?

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

The specific heat of water

= 4200 J

{kg}^{- 1} K^{- 1}

and the latent heat of ice

= 3.4 \times 10^{5} J

{kg}^{- 1}

100 g

of ice at

0^{o} C

is placed in

200 g

of water at

25^{o} C

. The amount of ice that will melt as the temperature of water reaches

0^{o} C

is close to (in grams)

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Two metallic blocks P and Q having masses in ratio

2 : 1

are supplied with the same amount of heat. If their temperatures rise by the same degree, compare their specific heat capacities.

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Write the SI unit of heat capacity.

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

What is the relationship between heat capacity and specific heat capacity of a substance?

MEDIUM

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Water of volume 2 L in a closed container is heated with a coil of 1 kW. While water is heated, the container loses energy at a rate of 160 J/s. In how much time will the temperature of water rise from 27^oC to 77^oC ? (Specific heat of water is 4.2 kJ/kg and that of the container is negligible).

EASY

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

Two moles of oxygen is mixed with eight moles of helium. The effective specific heat of the mixture at constant volume is

HARD

Science>Physics>Heat and Temperature>Measurement of Heat and the Factors on Which it Depends

A water cooler of storage capacity

120

litres can cool water at constant rate of

P

W

. In a closed circulation system (as shown schematically in the figure), the water from the cooler is used to cool an external device that generates constantly

3

kW

of heat (thermal load). The temperature of water fed into the device can not exceed

30^{o} C

and the entire stored

120

litres of water is initially cooled to

10^{o} C

. The entire system is thermally insulated. The minimum value of

P

(in

W

) for which the device can be operated for

3

hours is:

(Specific heat of water is

4.2 kJ

k g^{- 1} K^{- 1}

and the density of water is

1000 kg m^{- 3}

)

What happens to mass of substance when it's heated?

Important Questions on Heat and Temperature

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