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Calorie is the unit of which physical quantity?

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Important Questions on Thermal Properties of Matter

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

An aluminium piece of mass

50 g

initially at

300 ° C

is dipped quickly and taken out of

1 kg

of water, initially at

30 ° C .

If the temperature of the aluminium piece immediately after being taken out of the water is found to be

160 ° C,

what is the temperature of the water? Then, specific heat capacities of aluminium and water are

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

and

4200 J {kg}^{- 1} K^{- 1}

, respectively.

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

An unknown metal of mass

192 g

heated to a temperature of

100 ° C

was immersed into a brass calorimeter of mass

128 g

containing

240 g

of water at a temperature of

8.4 ° C .

Calculate the specific heat of the unknown metal if water temperature stabilizes at

21.5 ° C .

(

Specific heat of brass is

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

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

A copper ball of mass

100 g

is at a temperature

T

. It is dropped in a copper calorimeter of mass

100 g,

filled with

170 g

of water at room temperature. Subsequently, the temperature of the system is found to be

75 ° C

T

is given by:
(Given: room temperature

= 30 ° C

, specific heat of copper

= 0.1 cal g^{- 1} ° C^{- 1}

)

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Two taps supply water to a container, one at the temperature of

20 ° C

at the rate of

2 kg / minute

and another at

80 ° C

at the rate of

1 kg / minute

. If the container gets water from the two taps simultaneously for 10 minutes, then the temperature of water in the container is

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

A certain liquid has a melting point of

- 50 ° C

and a boiling point of

150 ° C

. A thermometer is designed with this liquid and its melting and boiling points are designated at

0 ° L

and

100 ° L

. The melting and boiling points of water on this scale are

MEDIUM

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

When

M_{1}

gram of ice at

- 10^{o} C

(specific heat

= 0.5 c a l g^{- 1} ℃^{- 1}

) is added to

M_{2}

gram of water at

50^{o} C,

finally no ice is left and the water is at

0^{o} C

. The value of latent heat of ice, in

c a l g^{- 1}

is:

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at

100^{o} C

, while the other one is at

0^{o} C

. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

The water equivalent of a calorimeter is

10 g

and it contains

50 g

of water at

15 ° C

. Some amount of ice, initially at

- 10 ° C

is dropped in it and half of the ice melts till equilibrium is reached. What was the initial amount of ice that was dropped (when specific heat of ice

= 0.5

cal

{gm}^{- 1} {}^{\circ}C^{- 1},

specific heat of water

= 1.0

cal

{gm}^{- 1 \circ} C^{- 1}

and latent heat of melting of ice

= 80

cal

{gm}^{- 1}

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

The SI unit of mechanical equivalent of heat is

EASY

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

At what temperature do the Fahrenheit and Celcius scales of temperature coincide?

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Solar energy is incident normally on the earth's surface at the rate of about

1 .4 kW m^{- 2}

. The distance between the earth and the sun is

1 .5 \times 10^{11} m

. Energy

(E)

and mass

(m)

are related by the Einstein equation,

E = m c^{2}

where

c = (3 \times 10^{8} m s^{- 1})

is the speed of light in free space. The decrease in the mass of the sun is

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

15 kW

drilling machine is used to drill a bore in a small aluminium block of mass

10 kg

. Assuming

50 %

power is used up in heating the machine itself or lost to the surroundings, then the rise in temperature of the block in

2

minutes is

(

Specific heat capacity of aluminium

= 0.91 J g^{- 1} ° C^{- 1}

)

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

A massless spring

(k = 800 N / m),

attached with a mass

(500 g)

is completely immersed in

1 k g

of water. The spring is stretched by

2 c m

and released so that it starts vibrating. What would be the order of magnitude of the change in the temperature of water when the vibrations stop completely? (Assume that the water container and spring receive negligible heat and specific heat of mass

= 400 J / k g K,

specific heat of water

= 4184 J / k g K

)

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were $- 8 ° C$ each? (Specific heat of ice is $2100 J {kg}^{- 1} K^{- 1}$ and latent heat of fusion of ice is $3.36 \times 10^{5} J {kg}^{- 1})$

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

When

100 g

of boiling water at

100 ° C

is added into a calorimeter containing

300 g

of cold water at

10 ° C

, temperature of the mixture becomes

20 ° C

. Then, a metallic block of mass

1 kg

10 ° C

is dipped into the mixture in the calorimeter. After reaching thermal equilibrium, the final temperature becomes

19 ° C .

What is the specific heat of the metal in CGS unit ?

HARD

Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

A metallic block of mass

20 kg

is dragged with a uniform velocity of

0.5 {ms}^{- 1}

on a horizontal table for

2.1 s

. The coefficient of static friction between the block and the table is

0.10

. What will be the maximum possible rise in temperature of the metal block, if the specific heat of the block is

0.1 CGS

unit? Assume

g = 10 {ms}^{- 2}

and uniform rise in temperature throughout the whole block. [Ignore absorption of heat by the table]

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Pyrometer is a device for measuring

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

Mercury is often used in clinical thermometers. Which one of the following properties of mercury is not a reason for this?

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Physics>Heat and Thermodynamics>Thermal Properties of Matter>Principle of Calorimetry

A thin paper cup filled with water does not catch fire when placed over a flame. This is because

Calorie is the unit of which physical quantity?

Important Questions on Thermal Properties of Matter

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