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