Future Secure Institute™

Name: Thermodynamics MM:[ ],Time:[ ] hour’s

Date:

Q1.two blocks which are at different states are brought into contact with each other and allowed to

reach a final state of thermal equilibrium . the final temperature attained is specified by the :-

a) Zeroth law of thermodynamics b) first law of thermodynamics

c)second law of thermodynamics d) third law of thermodynamics

Q2.match Lit-1 with List -2 and select the correct answer using the codes given below the lists :-

List-1 List -2

A. Adiabatic 1.n=infinity

B. isothermal 2.n=Cp/Cv

C. constant pressure 3.n=1

D. constant volume 4.n=zero

Codes:

A B C D

a) 2 3 1 4

b) 2 3 4 1

c) 3 2 1 4

d) 2 4 3 1

Q3. Number of components( c) ,phases (P) and degrees of freedom (F) are related by Gibbs phase rule

as:-

a) C-P-F=2 b)F-C-P=2 c)C+F-P=2 d)P+F-C=2

Q4.pressure reaches a value of absolute zero:-

a) at a temperature of-273K b)under vacuum condition

c)at the earth’s centre d)when molecular momentum of system becomes zero

Q5.which of the following are intensive properties?

1.Kinetic energy 2.specific enthalpy 3. Pressure 4.entropy

Select the correct answer using the code given below:-

a)1 and 3 b) 2 and 3 c)1,3and 4 d) 2 and 4

Q6.match List-1 with List-2 and select the correct answer using the code given below the lists:-

List-1

A. 0 B. 1.0 C. 1.4 D. ∞

List-2

1) isothermal 2)const volume 3)const pr. 4)Adiabatic

Codes:-

A B C D

a) 3 1 4 2

b) 2 1 4 3

c) 3 4 1 2

d) 2 4 1 3

Q7.match List-1 with List-2 and select the correct answer using the code given below the lists:-

List-1

A. mercury in glass

B. thermocouple

C. Thermistor

D. constant volume gas

List-2

1.pressure 2.Electrical resistance 3.volume 4.induced electric voltage

Codes:-

A B C D

a) 1 2 3 4

b) 3 4 2 1

c) 4 3 2 1

d) 2 1 3 4

Q8.consider the four processes A,B ,C and D shown in the graph given below:-

Match list-1 with List-2 and select the correct answer using the code given below the lists:-

List-1 List-2

A. A 1. 0

B. B 2. 1

C. C 3. 1.4

D. D 4.∞

Codes:-

A B C D

a) 4 2 3 1

b) 1 2 3 4

c) 1 3 2 4

d) 4 3 2 1

Q9.ice kept in a well insulated thermo flask is an example of which system?

a) closed system b)isolated system c) open system d)Non-flow adiabatic system

Q10.An idea gas at 27°C is heated at constant pressure till the volume becomes three times. The

temperature of the gas will then be:-

a)81°C b)900°C c)627°C d)927°c

Q11. when a system is taken from state A to state B along the path A-C-B,180kJ of the heat flow into the

system and it does 130kJ of the heat flows into the system and it does 130kJ work:-

How much heat will flow into the system along the path A-D-B if the work done by it along the path is 40

kJ?

a)40kJ b)60kJ c)90kJ d)135kJ

Q12.match List-1 with List-2 and select the correct answer using the codes given below the lists:

List-1

A. work done in a polytropic process

B. work done in steady flow process

C. heat transfer in a reversible adiabatic process

D. work done in an insentropic process

‐∫ 𝑽𝒅𝒑 2.zero 3.𝒑₁𝒗₁−𝒑₂𝒗₂

𝜸−𝟏 4.

𝒑₁𝒗₁−𝒑₂𝒗₂

𝒏−𝟏

Codes:-

A B C D

a) 4 1 3 2

b) 1 4 2 3

c) 4 1 2 3

d) 1 2 3 4

Q13.A control mass undergoes a process from state 1 to state 2 as shown in the figure below. During

this process, the heat transfer to the system is 200kJ.if the control mass returned adiabatically from

state 2 to state 1by another process, then the work interaction during the return process would be:

a)-400 b)-200 c)200 d)400

Q14.the data given in the table refers to an engine based on Carnot cycle,

Where Q₁=heat received(kJ/min)

Q₂=heat rejected(kJ/s)

Sno. Q₁ Q₂ W

1 1500 16.80 8.20

2 1600 17.92 8.75

3 1700 19.03 9.30

4 1800 20.15 9.85

If heat received by the engine is 2000 kJ/min the work output will be nearly

a)9.98 b)10.39 c)11.54 d)10.95

Q15.match List-1 with List -2 and select the correct answer using the codes given below the lists:-

List-1

A. Throttling process

B. isentropic process

C. free expansion

D. isothermal process

List-2

1.no work done

2.no change in entropy

3.constant internal energy

4.constant enthalpy

Codes:-

A B C D

a) 4 2 1 3

b) 1 2 4 3

c) 4 3 1 2

d) 1 3 4 2

Q16.the heat absorbed rejected during polytrophic process is equal to:-

a) 𝛾−𝑛

𝛾−1 ¹/² x work done b)

𝛾−𝑛

𝑛−1 ¹/² x work done

c) 𝛾−𝑛

𝛾−1 x work done d)

𝛾−𝑛

𝛾−1 ² x work done

Q17. Gas contained in a closed system consisting of piston cylinder arrangement is expanded. work

done by the gas during expansion is 50 kJ. decreases in internal energy of the gas during expansion is

30kJ.heat transfer during the process is equal to:-

a)-20kJ b)+20kJ c)-80kJ d)+80kJ

Q18.which one of the following is the steady flow energy equation for a boiler?

a)h₁ +𝑣₁²

2𝑔𝑗=h₂+

𝑣₂²

2𝑔𝑗 b)Q=(h₂-h₁) c)h₁+

𝑣₁²

2𝑔𝑗+Q=h₂+

𝑣₂²

2𝑔𝑗 d)Ws=(h₂-h₁)+Q

Q19.A system undergoes a process during which the heat transfer to the system per degree increase in

temperature is given by the equation:-

dQ/dT =2.0kJ/°C

the work done by the system per degree increase in temperature is given by the equation:

dW/dT=2-0.1 T

where T is in°C. if during the process the temperature of water varies from 100°C to 150°C, the change

in internal energy is:-

a) 125kJ b)-250kJ c)625kJ d)-1250kJ

Q20.A closed system undergoes a process 1-2 for which the values of Q₁₋₂ and W₁₋₂ are + 20kJ and +

50kJ.respectively. if the system is returned to state 1 and Q₂₋₁is-10kJ, what is the value of the work W₂₋₁?

a)+20 kJ b)-40kJ c)-80kJ d)+40kj

Q21.which one of the following is the correct sequence of the three processes A ,B and C In the

increasing order of the amount of work done by a gas following ideal-gas expansions by these

processes?

a)A-B-C b)B-A-C c)A-C-B d)C-A-B

Q22.Match List-1 with List-2 and select the correct answer using the given below the lists:-

List-1

A. isolated system b) nozzle c) Throttling device d) centrifugal compressor

List-2

1. energy is always constant

2. Increase in velocity at the expense of its pressure drop

3.Appreciable drop in pressure without any change in energy

4.enthalpy of the fluid increases by the amount of work input

Codes:-

A B C D

a) 4 3 2 1

b) 1 3 2 4

c) 4 2 3 1

d) 1 2 3 4

Q23.there is no work transfer involved in this process :-

a) Adiabatic expansion b)isothermal expansion

c) polytropic expansion d)free expansion

Q24. In which of the following processes, the heat is fully converted into work?

a) reversible adiabatic process b) reversible isobaric process

c)reversible isometric process d) reversible isothermal process

Q25. A non flow quasi-static process occurs for which

P=(-3V+16) bar,

Where Vis volume in m³. what is work done when V changes from 2 to 6 m³?

a) 16 x 10⁵J b)16.5 x 10⁵J c)16 x 10³J d)16.5 x 10²J

Q26

Q27. In a cyclic process, the heat transfer are +30J,-50J and -10J and +60J. the network for the cyclic

process is:-

a) 30Nm b)40Nm c)50Nm d)60Nm

Q28.A system executes a cyclic process during which there are two processes as given below:-

₁Q₂+ 460kj,₂Q₁= 100kJ and ₁W₂+210kJ,

What will be work interaction in process ₂W₁?

a) 100kJ b)-210kJ c)150kJ d)-150kJ

Q29.when a system undergoes a process such that ∫𝑑𝑄

𝑇 =0 and ds >0, the process is:-

a) irreversible adiabatic b) reversible adiabatic c)isothermal d)isobaric

Q30.A system of 100kg mass undergoes a process in which its specific entropy increases from0.3kj/kgK

to 0.4kJ/kgK. At the same time, the entropy of the surroundings decreases from 80kJ/K to 75kJ/K.

The process is:-

a) reversible and isothermal b) irreversible

c)reversible d)impossible

Q31.for a thermodynamic cycle to be irreversible, it is necessary that:-

a) ∮𝛿𝑄

𝑇 =0 b) ∮

𝛿𝑄

𝑇≤0 c) ∮

𝛿𝑄

𝑇 <0 d) ∮

𝛿𝑄

𝑇 =≥0

Q32.A reversible heat engine receives 6 kJ of heat from thermal reservoir at temperature 800 K, and 8 kJ

of heat from another thermal reservoir at temperature 600K.if it rejects heat to a third thermal reservoir

at temperature 100K. then the thermal efficiency of the engine is approximately equal to:-

a)65% b) 75% c)80% d) 85%

Q33.A reversible engine operates between temperatures T₁ and T₂. the energy rejected by a second

reversible engine at temperature T₂ and rejected to a reservoir at temperature T₃.if the efficiencies of

the engines are same then the relationship between T₁,T₂ and T₃ is given by:-

a) T₂=𝑇1+𝑇₃

2 b)T₂= 𝑇12 + 𝑇²₃ c)T₂= 𝑇₁𝑇₃ d) T₂= 𝑇1 + 𝑇₃ /2

Q34. For a heat engine operating on the carnot cycle, the work output is 1/4th of the heat transferred to

the sink. The efficiency of the engine is:-

a)20% b)33.3% c)40% d)50%

Q35.A reversible engine operates between temperatures 900 K and T₂(T₂ and 900 K) and another

reversible engine between T₂ and 400 K(T₂>400K) in series. The value of T₂ if work output of both the

engines are equal is:-

a)600K b)625K c)650K d)675K

Q36. A carnot engine operates between 27°C and 327°C. if the engine produces 300kJ of work, what is

the entropy change during heat addition?

a)0.5kJ/K b)1.0kJ/K c)1.5kJ/K d)2.0kJ/K

Q37.for a real thermodynamic cycle, which one of the following is correct?

a) ∮𝑑𝑄

𝑇 >0 b) ∮

𝑑𝑄

𝑇 <0 c) ∮

𝑑𝑄

𝑇 =0 d) ∮ 𝑑𝑠 = 0

Q38.assigning the basic dimensions to mass, length, time and temperature respectively as M,L,T and 𝜃

,what are the dimensions of entropy?

a)MLT¯²𝜃 b) ML² T¯¹𝜃 ¯¹ c) ML² T¯²𝜃 ¯¹ d) ML³ T¯²𝜃 ¯¹

Q39.A carnot engine operates between 327°C and 27°C.if the engine produces 300kJ of work, the

entropy change during heat addition is:

a)0.5kJ/K b)1.0kJ/K c)1.5kJ/K d)2.0kJ/K

Q40.An engine working on carnot cycle rejects 40% of absorbed heat from the source, while the sink

temperature is maintained at 27°C, then the source temperature is:-

a)750°C b)477°C c)203°C d)67.5°C

Q41.A carnot engine rejects 30% of absorbed heat to a sink at 30°C. the temperature of the heat source

is:-

a)100°C b)433°C c)737°C d)1010°C

Q42. The value of ∮𝑑𝑄

𝑇 for an irreversible cycle is:-

a)Equal to zero b) Greater than zero c) less than zero d)unity

Q43.an inventor states that his new conceptual engine, while operating between temperature limits of

377°C and 27°C, will reject 50% of heat absorbed from the source. What type of cycle will this engine

have?

a) carnot cycle b) stirling cycle c) impossible cycle d)possible cycle

Q44. The entropy of universe tends to:-

a)become zero b) remain constant c)be maximum d)attain a certain finite minimum value

Q45.the COP of an ideal refrigerator is N. if the machine is operated as a heat pump between the same

temperature limits, its COP will be:-

a)N-1 b)N c)N+1 d)2N

Q46. A carnot engine operates between 37°C and 347° C. if the engine produces 620kJ of work, the

entropy change during heat addition is:-

a)1kJ/K b)2kJ/K c)3kJ/K d)4kJ/K

Q47. A liquid of heat capacity 5 J/K in an insulated container is heated electrically from 300 K to 600 K,if

ln2 =0.693. entropy generation of the universe would be:-

a) 6.93J/K b)3.465J/K c)34.65J/K d)10.65J/K

Q48. Availability function for a closed system is expressed as:-

a)∅ =u+p₀ V-T₀ s b) )∅ =du+p₀V+T₀d s

c) )∅ =du+p₀dV-T₀ds d) ∅ =u+p₀V+T₀s

Q49. What will be the loss of available energy associated with the transfer of 1000kJ of heat from

constant temperature system at 600k to another at 400 K when the environment temperature is 300 K?

a) 150kJ b)250kJ c)500kJ d)700kJ

Q50. 100kJ of energy is transferred from a heat reservoir at 1000 K to a heat reservoir at 500K. the

ambient temperature is 300K. the loss of available energy due to heat transfer process is:-

a)20kJ b)30kJ c)40kJ d)50kJ

Q51.during a thermodynamic process, 100kJ of heat is transferred from a reservoir at 800 K to a sink at

400 K. the ambient temperature is 300 K. the loss of available energy is:-

a)27.5kJ b)32.5kJ c)37.5kJ d)62.5kJ

Q52. Joule-Thomson coefficient is defined as:-

a) 𝜕𝑇

𝜕𝑝 h b)

𝜕ℎ

𝜕𝑝 T c)

𝜕ℎ

𝜕𝑝 p d

𝜕𝑝

𝜕𝑇 h

Q53.clausius –clapeyron equation gives the ‘slope’ of a curve in:-

a) p-V diagram b)p-h diagram c)p-T diagram d)T-s diagram

Q54.Gibb’s free energy ‘G’ defined as:-

a)G=H-Ts b)G=u-Ts c)G=u+pV d)G=H+Ts

Q55.consider the following thermodynamic relation:-

1.Tds=du + pdV 2.Tds=du-pdV 3.Tds=dh+Vdp 4.Tds=dh-Vdp

Which of these thermodynamic relations are correct?

1) 1 and 3 2)1 and 4 3)2 and 3 4)2 and 4

Q56. Which one of the following functions represents the clapeyron equation pertaining to the change

of phase of a pure substance?

a)f(T,p,hfg) b)f(T,p,hfg ‘Vfg ) c)f(T,p,hfg sfg ) d)f(T,p,hfg ‘Vfg )

Q57. The throttling of certain gases may be used for getting the refrigeration effect. The value of joule-

Thomson coefficient for such a throttling process is:-

a)𝜇 =0 b)𝜇 =1 c)𝜇 <1 d)𝜇>1

Q58.consider the phase diagram of a certain substance as shown in the given figure. match List-1 with

List -2 and select the correct answer using the codes given below the lists:-

List-1 List-2

A. vaporization 1.EF

B. Fusion 2.EG

C. sublimation 3.ED

Codes:-

A B C

a) 1 3 2

b) 1 2 3

c) 3 2 1

d) 3 1 2

Q59. With increase of pressure, the latent heat of steam:-

a)remains same b)increases c) decreases d)behaves unpredictably

Q60.match List-1 with List -2 and select the correct answer using the code given below the lists:-

List-1

A. critical point

B. sublimation

C. Triple point

D. Melting

List-2

1.all the three phases solid, liquid and vapour co-exists in equilibrium

2.phase change from solid to liquid

3.properties of saturated liquid and saturated vapour are identical

4. heating process where solid gets directly transformed to gaseous phase

Codes:-

A B C D

a) 2 1 4 3

b) 3 4 1 2

c) 2 4 1 3

d) 3 1 4 2

Q61. In aircraft, air refrigeration cycle is used because of:-

a) low unit weight per tonne of refrigeration

b)high heat transfer rate

c)lower temperature at high-altitudes

d)higher coefficient of performance

Q62.A heat pump operating on carnot cycle pumps heat from a reservoir at 300 K to a reservoir at 600

K. the coefficient of performance is:-

a)1.5 b) 0.5 c)2 d)1

Q63.one ton refrigeration is equivalent to:-

a)3.5 kW b) 50kJ/s c)1000j/min d) 1000kJ/min.

Q64.A carnot heat pump works between temperature limits of 277°C and 27°C. its COP is:-

a)1.108 b)1.2 c)2.2 d)9.26

Q65.An ideal refrigerating machine works between the temperature limits of 45°C and -8°C. the power

required per ton of refrigeration is:-

a) 1.0kW b)1.2kW c)0.8kW d)0.7kW

Q66.the refrigerant used for absorption refrigerators working heat solar collectors is mixture of water

and:-

a)carbon dioxide b) sulphur dioxide c) lithium bromide d) Freon 12

Q67. In an ideal refrigeration (reversed carnot) cycle, the condenser and evaporator temperature are

27°C and -13°C respectively. The COP of this cycle would be:-

a)6.5 b)7.5 c)10.5 d)15.0

Q68. Match list-1 with list-2 and select the correct answer using the codes given below the lists:-

List-1

A. bell coleman refrigeration

B. vapour compression refrigeration

C.Absorption refrigeration

D.jet refrigeration

List-2

1. compressor

2.generator

3.flash chamber

4.Expansion cylinder

CODES:-

A B C D

a) 1 4 3 2

b) 4 1 3 2

c) 1 4 2 3

d) 4 1 2 3

Q69.Air refrigeration cycle is used in:-

a) commercial refrigerators

b) Domestic refrigerators

c)Gas liquefaction

d)Air-conditioning

Q70.in milk chilling plants, the usual secondary refrigerant is:-

a) Ammonia solution b) sodium silicate c) Glycol d) Brine

Q71. The maximum COP for the absorption cycle is given by(TG =generator temperature, Tc=environment

temperature, TE = refri-gerated space temperature)

a) TE(TG-TC)/TG(Tc-TE) b) TG(Tc-TE)/TE(TG-Tc)

c)Tc(TG –TE)/TG(Tc-TE) d)TG (TC-T)TG-TE)

Q72. The correct sequence of the given components of a vapour compression refrigerator is:0

a) evaporator, compressor, condenser and throttle valve

b) condenser, throttle valve, evaporator and compressor

c) compressor, condenser, throttle valve and evaporator

d)throttle valve, evaporator, compressor and condenser

Q73.the enthalpies at the beginning of compression at the end of compression and at the end of

condensation are respectively 185kJ/kg, 210kJ/kg and 85 kJ/kg. the COP of the vapour compression

refrigeration system is:-

a)0.25 b)5.4 c)4 d)1.35

Q74. A good refrigerant should have:-

a)large latent heat of vaporization and low operating pressures

b)small latent heat of vaporization and high operating pressures

c) large latent heat of vaporization and large operating pressures

d) small latent heat of vaporization and low operating pressures

Q75.solar energy can be directly used in:-

a)vapour compression refrigeration system

b)vapour absorption refrigeration system

c)air refrigeration system

d)jet refrigeration system

Q76.match List-1 with list -2 aad select the correct answer using the codes given below the lists:-

List-1

a.R-12 b.R-22 c.R-717 d.R-113

List-2

1.Trichloro-trifluoro-ethane(CCI₂F-CCIF₂)

2.Difluoro-monocholoro-methane(CHF₂CI)

3.Ammonia(NH₃)

4. Difluoro-dichloro-methane(CCI₂F₂)

CODES:-

A B C D

a) 3 2 4 1

b) 4 2 3 1

c) 3 1 4 2

d) 4 1 3 2

Q77.A solar –absorption refrigeration system has generator temperature of 87° C, evaporator

temperature of -3°C, condenser and absorber temperature of 27°C each, then its maximum possible

COP is:-

a)10.0 b) 9.0 c)1.80 d) 1.50Maximum possible COP of a solar absorption refrigeration

system with generator temperature of 360 K, absorber temperature of 300 K, condenser temperature of

300 K and evaporator temperature of 270 K is:-

a)9 b) 6 c)3 d)1.5

Q78.Match List-1 with List -2 for bell Coleman or joule or reverse bray ton cycle for gas cycle

refrigeration and select the correct answer using the codes given below the lists:-

List-1 List-2

A. compression 1.isobaric

B. heat rejection 2.isothermal

C. Expansion 3.isentropic

D. heat absorption 4.isenthalpic

CODES:-

A B C D

a) 3 1 4 2

b) 3 1 3 1

c) 3 2 3 2

d) 3 1 2 2

Q79. A-bell-coleman air refrigeration cycle works as a reversed:-

a) stirling cycle b)otto cycle c)diesel cycle d)brayton cycle

Q80. A carnot refrigerator has a COP of 6. What is the ratio of the lower to the higher absolute

temperatures?

a)1/6 b)7/8 c)6/7 d)1/7

Q81. The figure given below depicts saturation dome for water on the temperature –entropy plane.

What is the temperature difference ∆T shown on a typical isobar line known as?

a) degree of wet bulb depression b) degree of saturation

c)degree of subcooling d) degree of reheat

Q82. In a vapour absorption refrigeration, heat is rejected in:-

a) condenser only b) Generator only

c)Absorber only d) condenser and absorber

Q83. When the brayton cycle working in the pressure limits of p₁ and p₂ is reversed and operated as a

refrigerator , what is the ideal value of COP for such a cycle?

Q84.selection of a refrigerant for a vapour compression system depends on which among the following?

a) Toxicity b) Environmental effect c)saturation pressure –temperature relationship d) all the above

Q85. What is an azeotrope?+-

a) A non-halogenic refrigerant

b) A refrigerant dissolved in alcohol

c) a mixture of refrigerants without phase separation

d) An eco-friendly refrigerant

Q86. In conventional refrigerants what is the element responsible for ozone depletion?

a) Chlorine b)Fluorine c)Carbon d)Hydrogen

Q87. Lowest COP is of vapour:

a) Compression cycle with superheated vapour

b)Compression cycle with dry compre-ssion

c)Compression cycle with wet compre-ssion

d) Absorption cycle

Q88. The following readings refer to a vapour compression refrigerator:-

The enthalpy per kg of refrigerant flow, from p-h chart

At inlet to compressor-1500kj/kg

At outlet to compressor-1700kJ/kg

At exit of condenser-300 kJ/kg

The COP of the refrigerator is:-

a) 3 b) 4 c)5 d)6

Q89.Ammonia used as refrigerant is non-corrosive to:-

a) iron and steel b) copper and copper alloys

c)both(a) and (b) d) Neither (a) nor (b)

Q90.the most suitable pair of refrigerant and absorbent combination for solar refrigeration is:-

a)ammonia and water b) ammonia and sodium thiocyanide

c)water and lithium bromide d) R22 and dimethylformamide

Q91.A carnot heat pump works between 27°C and 327°C . what will be its COP?>

a)0.09 b)1.00 c)1.09 d)2.0

Q92.at 100% relative humidity , the wet bulb temperature is:-

a) more than dew point temperature

b)same as dew point temperature

c)less than dew point temperature

d)equal to ambient temperature

Q93.the expression0.622𝑃𝑣

𝑃𝑡−𝑃𝑣 is used to determine:-

a) relative humidity b)specific humidity c)Degree of saturation d)Partial pressure

Q94. The equation ∅=𝑃𝑣

𝑃𝑠 is used to calculate the (pv = partial pressure of water vapour in moist air at a

given temperature ,

Ps = saturation pressure of water vapour at the same temperature)

a) relative humidity b) Degree of saturation

c)Specific humidity d)Absolute humidity

Q95.the optimum effective temperature for human comfort is:-

a) higher in winter than that in summer b) lower in winter than that in summer

c)same in winter and summer d) not dependent on season

Q96. The wet bulb depression is zero, when relative humidity is equal to:-

a) 100% b)60% c)40% d)zero

Q97. On a psychrometric chart, what does a vertical downward line represent?

a)Adiabatic saturation b) Sensible cooling c)Dehumidification d)Humidification

Q98.during sensible cooling of moist air, its relative humidity:-

a) increases b) does not change c)decreases d)affects specific humidity

Q99. In a sensible heating or cooling process:-

a) dry bulb temperature remains constant

b)wet bulb temperature remains constant

c)the humidity ratio remains constant

d)the relative humidity remains constant

Q100.A certain air has DBT 35°C and DPT of 20°C, the corresponding saturation pressure of water being

5.628kPa and 2.33kPa respectively. When the atmospheric pressure is assumed as 1.0132 bar, the

specific humidity of air will be:-

a)2.5 x 10¯³ b)7.8 x 10¯³ c)14.7 x 10¯³ d)25 x 10¯³