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Calorie is defined as the amount of heat required to raise temperature of $1 g$ of water by $1 ° C$ and it is defined under which of the following conditions :-

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Important Questions on Thermodynamics

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

When heat

Q

is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by

∆ T

. The heat required to produce the same change in temperature, at a constant pressure is:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

For a diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

C_{p} - C_{v} = \frac{R}{M}

and

C_{v}

are specific heats at constant pressure and constant volume respectively. It is observed that,

C_{p} - C_{v} = a

for hydrogen gas and

C_{p} - C_{v} = b

for nitrogen gas. The correct relation between

a

and

b

is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

One mole of

O_{2}

gas is heated at constant pressure starting at

27 ° C

. How much energy must be added to the gas as heat to double its volume?

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

The specific heats,

C_{p}

and

C_{v}

of a gas of diatomic molecules,

A,

are given (in units of

J m o l^{- 1} K^{- 1}

) by

29

and

22,

respectively. Another gas of diatomic molecules,

B,

has the corresponding values

30

and

21 .

If they are treated as ideal gases, then:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

4.0 g

of a gas occupies

22.4

liters at NTP. The specific heat capacity of the gas at constant volume is

5.0 J K^{- 1} m o l^{- 1}

. If the speed of sound in this gas at NTP is

952 m s^{- 1}

, then the heat capacity at constant pressure is

(Take gas constant

R = 8.3 J K^{- 1} m o l^{- 1}

)

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

What will be the molar specific heat at constant volume of an ideal gas consisting of rigid diatomic molecules?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

The SI unit of mechanical equivalent of heat is

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

The values of

C_{p}

and

C_{v}

for a diatomic gas are respectively

(R = g a s

constant)

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

A cylinder with fixed capacity of

67.2

litre contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by

20 ° C

is:
[Given that

R = 8.31 J m o l^{- 1} K^{- 1}]

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

The quantities of heat required to raise the temperature of two solid copper spheres of radii

r_{1}

and

r_{2} (r_{1} = 1.5 r_{2})

through

1 K

are in the ratio:

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

One gram mole of an ideal gas

A

with the ratio of constant pressure and constant volume specific heats

γ_{A} = \frac{5}{3}

is mixed with

n

gram moles of another ideal gas

B

with

γ_{B} = \frac{7}{5}

. If the

γ

for the mixture is

\frac{19}{13}

, then what will be the value of

n

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

One mole of a monoatomic ideal gas undergoes a quasistatic process, which is depicted by a straight line joining points

(V_{0}, T_{0})

and

(2 V_{0}, 3 T_{0})

in a

V - T

diagram. What is the value of the heat capacity of the gas at the point

(V_{0}, T_{0}) ?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

Pyrometer is a device for measuring

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Specific Heat Capacity

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

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1°C and it is defined under which of the following conditions :-

Important Questions on Thermodynamics

Learn and Prepare for any exam you want !

Calorie is defined as the amount of heat required to raise temperature of $1 g$ of water by $1 ° C$ and it is defined under which of the following conditions :-