**Latest Thermodynamics Objective Questions**

**1.General gas equation is**

PV=nRT

PV=mRT

PV = C

PV=KiRT

Cp-Cv = Wj

**ANSWER : : PV=mRT**

**2.The unit of energy in S.I. units is**

watt

joule

joule/s

joule/m

joule m.

**ANSWER : : joule**

**3.No liquid can exist as liquid at**

– 273 �K

vacuum

zero pressure

centre of earth

in space.

**ANSWER : : zero pressure**

**4.The unit of length in S.I. units is**

meter

centimeter

kilometer

millimeter.

**ANSWER : : meter**

**5.According to GayLussac law for a perfect gas, the absolute pressure of given mass varies directly as**

temperature

absolute

absolute temperature, if volume is kept constant

volume, if temperature is kept constant

remains constant,if volume and temperature are kept constant.

**ANSWER : : absolute temperature, if volume is kept constant**

**6.The unit of power in S.I. units is**

newton

pascal

erg

watt

joule.

**ANSWER : : watt**

**7.According to Dalton’s law, the total pres sure of the mixture of gases is equal to**

greater of the partial pressures of all

average of the partial pressures of all

sum of the partial pressures of all

sum of the partial pressures of all divided by average molecular weight

atmospheric pressure.

**ANSWER : : sum of the partial pressures of all**

**8.An ideal gas as compared to a real gas at very high pressure occupies**

more volume

less volume

same volume

unpredictable behavior

no such correlation.

**ANSWER : : more volume**

**9.According to kinetic theory of gases, the absolute zero temperature is attained when**

volume of the gas is zero

pressure of the gas is zero

kinetic energy of the molecules is zero

specific heat of gas is zero

mass is zero.

**ANSWER : : kinetic energy of the molecules is zero**

**10.The unit of pressure in S.I. units is**

kg/cm2

mm of water column

pascal

dynes per square cm

bars

**ANSWER : : pascal**

**11.Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to**

T

j

J2

Vr

1/Vr.

**ANSWER : : T**

**12.Temperature of a gas is produced due to**

its heating value

kinetic energy of molecules

repulsion of molecules

attraction of molecules

surface tension of molecules.

**ANSWER : : kinetic energy of molecules**

**13.The condition of perfect vacuum, i.e., absolute zero pressure can be attained at**

a temperature of – 273.16�C

a temperature of 0�C

a temperature of 273 �K

a negative pressure and 0�C temperature

can’t be attained.

**ANSWER : : a temperature of – 273.16�C**

**14.Absolute zero pressure will occur**

at sea level

at the center of the earth

when molecular momentum of the system becomes zero

under vacuum conditions

at a temperature of – 273 �K

**ANSWER : : when molecular momentum of the system becomes zero**

**15.The unit of time in S.I. units is**

second

minute

hour

day

year.

**ANSWER : : second**

**16.Intensive property of a system is one whose value**

depends on the mass of the system, like volume

does not depend on the mass of the system, like temperature, pressure, etc.

is not dependent on the path followed but on the state

is dependent on the path followed and not on the state

remains constant.

**ANSWER : : does not depend on the mass of the system, like temperature, pressure, etc.**

**17.The pressure a gas in terms of its mean kinetic energy per unit volume E is equal to**

E/3

E/2

3E/4

2E/3

5E/4.

**ANSWER : : 2E/3**

**18.The unit of mass in S.I. units is**

kilogram

gram

tonne

quintal

newton.

**ANSWER : : kilogram**

**19.Which qf the following laws is applicable for the behavior of a perfect gas**

Boyle’s law

Charles’law

Gay-Lussac law

all of the above

Joule’s law.

**ANSWER : : all of the above**

**20.A closed system is one in which**

mass does not cross boundaries of the system, though energy may do so

mass crosses the boundary but not the energy

neither mass nor energy crosses the boundaries of the system

both energy and mass cross the boundaries of the system

thermodynamic reactions take place.

**ANSWER : : mass does not cross boundaries of the system, though energy may do so**

**21.Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits.**

02, N2, steam, C02

Oz, N2, water vapour

S02, NH3, C02, moisture

02, N2, H2, air

steam vapours, H2, C02.

**ANSWER : : 02, N2, H2, air**

**22.The unit of temperature in S.I. units is**

Centigrade

Celsius

Fahrenheit

Kelvin

Rankine.

**ANSWER : : Kelvin**

**23.Kinetic theory of gases assumes that the collisions between the molecules are**

perfectly elastic

perfectly inelastic

partly elastic

partly inelastic

partly elastic and partly inelastic.

**ANSWER : : perfectly elastic**

**24.Superheated vapour behaves**

exactly as gas

as steam

as ordinary vapour

approximately as a gas

as average of gas and vapour.

**ANSWER : : approximately as a gas**