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Homework answers / question archive / University of Alabama, Birmingham - ELC 101 1)What is the equation for the work done by a constant temperature system?   a

University of Alabama, Birmingham - ELC 101 1)What is the equation for the work done by a constant temperature system?   a

Electrical Engineering

University of Alabama, Birmingham - ELC 101

1)What is the equation for the work done by a constant temperature system?

 

a.         C.12 kJ

b.         D.14 kJ

Formula: W = p(V2-V1)

2.         refer to problem no.13. Determine the specific volume.

•          A. 0.02 ft^3/lbm

•          B. 0.05 ft^3/lbm

•          C. 1.0 ft^3/lbm

•          D. 1.2 ft^3/lbm Formula :

Vf = ( pi d^2 h) / 4 Pf = mf / vf

Specific volume= Vf /mf

3.         What is the weight of a66-kgm man at standard condition? (Formula: Fg= mg / k)

a.         a. 66 kgf

b.         b. 66 kgm

c.         c. 66 lbm

d.         d. 66 gf

4.         What is the specific weight of water at standard condition? (Formula: γ = ρg / k)

a.         a. 1000 kgm/m3

b.         b. 9.8066 m/s2

c.         c. 1000 kgf/m3

d.         d. None of the above 323. 746 °R =    °F

5.         Twenty grams of oxygen gas are compressed at a constant temperature of 30 ?C to 5%of their original volume. What work is done on the system.

a.         A.824 cal

b.         B.924 cal

c.         C.944 cal

d.         D.1124 cal Formula:

W = -mRTln (V2/V1)

Where R = (1.98 cal/gmole?K) (32 g/gmole)

6.         Helium ( R= 0.4698 BTU/lbm-?R ) is compressed isothermally from 14.7 psia and 68 ?F. The compression ratio is 1:4. Calculate the work done by the gas.

a.         A. –1454 BTU/lbm

b.         B. -364 BTU/lbm

c.         C.-187BTU/lbm

d.         D.46.7 BTU/lbm Formula: W = RT ln (V2/V1)

 

7. A 30-m vertical column of fluid (density 1878 kg/m3 ) is

located where g= 9.65 mps2. Find the pressure at the base of the column.

(Formula: pg= gρhg/k )

•          a. 543680 N/m2

•          b. 543.68 kPa (gauge)

•          c. Both a & b

•          d. None of the above

8.         Ten cu ft. of air at 300 psia 400°F is cooled to 140°F at constant volume. What is the final pressure?

(formula: p2 = p1T2/T1)

e.         a. 0

f.          b. 209 psia

g.         c. - 420 psia

h.         d. None of the above 326. 876 °R =    °F

i.          a. 335

j.          b. 416

k.         c. 400

l.          d. None of the above

9.         There are 1.36 kg of gas, for which R = 377 J/kg.k and k = 1.25, that undergo a nonflow constant volume process from p1 =

551.6 kPa and t1 = 60°C to p2 = 1655 kPa. During the process the gas is internally stirred and there are also added 105.5 kJ of heat. Determine t2.

(Formula: T2= T1p2/ p1)

•          a. 999 K

•          b. 0.51 j

•          c. 0.46 j

 

•          c. 456 K

•          d. One of the above

10.       5 atm =            mmHg

a.         a. 8300

b.         b. 3800

c.         c. 3080

d.         d. None of the above

11.       A certain gas, with cp = 0.529Btu/lb.°R and R = 96.2 ft.lb/lb.°R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5 psia. Compute for T2. (Formula: T2= T1V2/V1)

a.         a. 460°R

b.         b. 270°R

c.         c. 1620 °R

d.         d. None of the above

12.       In the above problem, compute for the mass. (Formula: m = p1V1 / RT1)

a.         a. 0.2148 lb

b.         b. 0.2134 lb

c.         c. 0.1248 lb

d.         d. None of the above 331. 710°R=      °C

e.         a. 214

f.          b. 121

g.         c. 213

h.         d. None of the above 332. 212 °F =    °C

i.          a. 200

j.          b. 150

k.         c. 100

l.          d. None of the above

13.       Let a closed system execute a state change for which the heat is Q = 100 J and work is W = -25 J. Find ?E.

(Formula: ?E = Q- W)

a.         a. 125 J

b.         b. 123 J

c.         c. 126 J

d.         d. None of the above

14.       A pressure gage registers 50 psig in a region where the barometer is 14.25 psia. Find absolute pressure in psia, Pa. (Formula; p = patm+ pg)

a.         a. 433 kPa

b.         b. 443 kPa

c.         c. 343 kPa

d.         d. None of the above

15.       A mass of 5kg is 100m above a given datum where local g =

9.75 m/s2. Find the gravitational force in newtons. (Formula: Fg= mg/k )

•          a. 48.75 N

•          b. 50 N

•          c. 45 N

•          d. None of the above

16.       In the above problem, find the potential energy of the mass with respect to datum.

(Formula: P = mgz/k )

a.         a. 4875 j

b.         a. 981 N

 

c.         d. None of the above

17.       The combined mass of car and passengers travelling at 72 km/hr is 1500 kg. Find the kinetic energy of this combined mass. (Formula: K =mv2/ 2k )

a.         a. 300 kJ

b.         b. 200 kJ

c.         c. 500 kJ

d.         d. None of the above

18.       14.696 psia =   mmHg

a.         a. 760

b.         b. 1

c.         c. 350

d.         d. None of the above

19. 212 °C =     K

e.         a. 485

f.          b. 435

g.         c. 498

h.         d. None of the above

20. 212 °F =     R

i.          a. 567

j.          b. 672

k.         c. 700

l.          d. None of the above

21.       An automobile tire has a gauge pressure of 200 kpa at 0°C assuming no air leaks and no change of volume of the tire, what is the gauge pressure at 35ºC.

•          a. 298.645

•          b. 398.109

•          c. 291.167

•          d. 281.333

Pg = Pabs - Patm

22.       An ideal gas at 45psig and 80ºF is heated in the close container to 130ºF. What is the final pressure?

a.         a. 65.10 psi

b.         b. 65.11 psi

c.         c. 65.23 psi

d.         d. 61.16 psi

P1V1/T1= P2V2/T2;V = Constant

23.       A wall of the firebrick has an inside temperature of 313ºF and an outside temperature of 73ºF. What is the difference in the surface temperature in Rankin?

a.         a. 70

b.         b. 68

c.         c. 72

d.         d. 94 ºR = ºF + 460

24.       What is the force required to accelerate amass of 30kg at a rate of 15m/s².

a.         a. 460 N

b.         b. 380 N

c.         c. 560 N

d.         d. 450 N

F = ma

25.       How much does an object having the mass of 100kg weight in newton.

a.         d. 210 kap Pabs = Pg + Patm

 

b.         b. 991 N

c.         c. 981.6 N

d.         d. 980.1N

F = ma

26.       A certain gas with cp = 0.529Btu/lb°R and R = 96.2ft/lbºR expands from 5 ft and 80ºF to 15 ft while the pressure remains constant at 15.5 psia.

a.         a. T2=1.620ºR, ?H = 122.83 Btu

b.         b. T2 = 2°R, ?H = 122.83 Btu

c.         c. T2 = 2.620ºR, ?H = 122.83 Btu

d.         d. T2 = 1°R, ?H = 122.83 Btu

T2= V2(t2)/V1 and ?H = mcp (T2-T1)

27.       A vacuum is connected to a tank reads 3kpa at a location w/ the barametric pressure reading is 75mmhg. Determined the P absolute in the tank

a.         a. 70.658 kpa

b.         b. 68 kpa

c.         c. 58.78 kap

d.         d. None of the above Pabs = Patm – Pvacuum

28.       Calculate:

a.         Mass flow rate in lb/hr.

b.         The velocity at section 2 in fps

•          a. 800,000lb/hr;625ft/s

•          b. 900,000lb/hr;625 ft/s

•          c. 888,000lb/hr;269 ft/s

•          d. 700,000lb/hr;269 ft/s m = A1V!/V1

29.       A 600kg hammer of a pile driver is lilted 2m the pilling head. What is the change of potential energy? If the hammer is realest. What will be its velocity and the instant if it sticks the pilling?

a.         a. 10,772 N-m and 5.26m/s

b.         b. 13,200 N-m and 5.26m/s

c.         c. 11,772 N-m and 6.26m/s

d.         d. 11,77 2N-m and5.26m/s

?PE = mgo(?Z)/gc

30.       A bayabas falls from a branch 5m above the ground with what speed in meter per second does it strike the ground assume g = 10m/s².

a.         a. 11m/s

b.         b. 12m/s

c.         c. 13m/s

d.         d. 10m/s

?KE = mV2/2gc

31.       While swimming a depth of 13m in a fresh water lake a fish emits an air bubble of volume 2 mm² atmospheric pressure is 100kpa what is the original pressure of the bubble.

a.         a. 217.17 kpa

b.         b. 119 kpa

c.         c. 326.15 kpa

d.         b. 567 fpm

 

32.       Oxygen at 15ºC and 10.3 Mpa gauge pressure occupies 600L. What is the occupied by the oxygen at 8.28 Mpa gauge pressure and 35ºC?

a.         a. 789.32 L

b.         b. 796.32 L

c.         c. 699 L

d.         d. 588 L V2= P1V1/T1P2

33.       Water is flowing through a 1 foot diameter pipe at the rate of 10ft/sec. What is the volume flow rate of water in ft³/sec?

a.         a. 7.85

b.         b. 6.85

c.         c. 8.85

d.         d. 5.85 V = Aν

34.       A certain fluid is flowing in a 0.5m x 0.3 channel at the rate of 3 m/s and has a specific volume of 0.012 m³/kg. Determined the mass of water flowing in kg/s.

a.         a. 267 kg/s

b.         b. 378 kg/s

c.         c. 375 kg/s

d.         d. 456.5 kg/s m = Aν/V

35.       A gas having a volume of100 ft³ at 27ºC is expanded to 120 ft³by heated at constant pressure to what temperature has it been heated to have this new volume?

a.         a. 87°C

b.         b. 85°C

c.         c. 76°C

d.         d. 97°C t2= T2–T1

36.       Water flow to a terminal 3 mm diameter and has an average speed of 2 m/s. What is the rate of flow in cubic meter/mm?

a.         a. 0.0001m³/min

b.         b. 0.076 m³/min

c.         c. 0.085 m³/min

d.         d. 0.097 m³/min

37.       Water flowing at a 6m/s through a 60 mm pipe is suddenly channeled into a 30 mm pipe. What is the velocity in the small pipe?

a.         a. 34m/s

b.         b. 24m/s

c.         c. 15m/s

d.         d. 27m/s

38.       A vertical column of water will be supported to what height by standard atmospheric pressure.

a.         a. 33.9 ft

b.         b. 45 ft

c.         c. 67 ft

d.         d. 25.46 ft ho= Po/Yo

39.       A fluid flows in a steady manner between two section in a flow line at section 1: A 1 = 1ft², V1 = 100fpm, volume1 of 4ft³/lb. at sec2: A2 = 2 ft², p= 0.20 lb/ft³ calculate the velocity at section 2.

a.         a. 625 fpm

from 1 bar to 3000 bar the Gibbs free energy increases by 360 kJ. Estimate the density of the liquid.

b.         a. 0.66 kg liter-1

 

c.         c. 356 fpm

d.         d. None of the above

40.       The weight of an object is 50lb. What is its mass at standard condition?

a.         a. 50 lbm

b.         b. 60 lbm

c.         c. 70 lbm

d.         d. 80 lbm formula: m = Fgk /g

41.       A vertical column of water will be supported to what height by standard atmospheric pressure. If the Y w = 62.4lb/ft3po =

14.7 psi.

•          a. 44.9 ft

•          b. 33.9 ft

•          c. 22.9 ft

•          d. 55.9 ft formula: ho= po/Yw

42.       For a certain gas R = 320 J/kg.K and cv= 0.84kJ/kg.K. Find k?

a.         a. 1.36

b.         b. 1.37

c.         c. 1.38

d.         d. 1.39

formula: k= R / cv+1

43.       Ten cu. ft of air at 300psia and 400°F is cooled to 140°F at constant volume. What is the transferred heat?

a.         a.-120Btu

b.         b. -220Btu

c.         c.-320Btu

d.         d. -420Btu formula: Q= mcv(T2-T1)

44.       Utilizing the answer to the previous problem, estimate the overall or average increase in temperature ( ΔT) of the concrete roof from the energy absorbed from the sun during a12hour day. Assume that all of the radiation absorbed goes into heating the roof. The specific heat of concrete is about 900 J/kg, and the density is about 2,300 kg/m3.

a.         a. 7.9 °C

b.         b. 8.9°C

c.         c. 9.9°C

d.         d. 10.9°C

formula: ΔQ = m c ΔT

45.       The concrete roof of a house is 10 m by 8 m and 10 cm thick (4"). Estimate the total heat the roof would absorb over the 12 day?

a.         a. 1.3 x 108 J

b.         b 2.3 x 108 J

c.         c. 3.3 x 108 J

d.         d. 4.3 x 108 J

formula: ΔQ = ΔQ/Δtx Δt

46.       The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?

a.         a. -540 J

b.         b. -640 J

c.         c. -740 J

d.         d. -840 J

formula: ΔU = q +w

47.       When the pressure on a 1 kg liquid is increased isothermally

a.         d. –1994 kJ/min

 

b.         b. 0.77 kg liter-1

c.         c. 0.88 kg liter-1

d.         d. 0.99 kg liter-1

48.       A car whose mass is 2 metric tons is accelerated uniformly from stand hill to 100 kmph in 5 sec. Find the driving force in Newton’s.

a.         a. 11,120 N

b.         b. 11,320 N

c.         c. 11,420 N

d.         d. 11520 N

formula: F= ma / k

49.       An ideal gas of volume 1liter and pressure 10 bar undergoes a quasistatic adiabatic expansion until the pressure drops to 1 bar. Assume γ to be 1.4 what is the final volume?

a.         a. 3.18 l

b.         b. 4.18 l

c.         c. 5.18 l

d.         d. 6.18 l

50.       Two masses, one of the 10kg and the other unknown, are placed on a scale in a region where g = 9.67 m/sec2. The combined weight of these two masses is 174.06 N. Find the unknown mass in kg.

a.         a. 20 kg

b.         b. 19 kg

c.         c. 18 kg

d.         d. 17 kg formula: m=Fg k / g

51.       The flow energy of 5 ft3 of a fluid passing a boundary to a system is 80,000 ft-lb. Determine the pressure at this point.

a.         a. 222 psi

b.         b. 333 psi

c.         c. 444 psi

d.         d. 111 psi formula: Ef= pV

52.       Find ? for steam at 100 psia and 600°F.If h = 1329.6 and v = 6.216

a.         a. 1214 Btu / lb

b.         b. 1234 Btu /lb

c.         c. 1342 Btu / lb

d.         d. 1324 Btu /lb formula: ? = h– pv/ J

53.       What mass of nitrogen is contained in a10 ft3 vessel at a pressure of 840atm and 820°R? Make a computation by using ideal gas equation.

a.         a. 194lb

b.         b. 214lb

c.         c. 394 lb

d.         d. 413lb formula: m=pV /RT

54.       A rotary compressor receives 6m3/ min of a gas(R=410J/ kgK, cp=1.03kJ /kgK,k= 1.67) at 105 k/Paa, 27°C and delivers it at 630kPaa: ΔP = 0, ΔK= 0. Find the work if the process is isentropic?

a.         a. –1664 kJ/min

b.         b. –1774 kJ/min

c.         c. –1884 kJ/min

d.         a) 265.4°C, 430.7kJ/kg, 71.4kJ/kg, 1.0327kJ/(kg) (K),502.1 kJ/kg

e.         b) 204.2°C, -703.2 kJ/kg, -84.15 kJ/kg, -1.7505 kJ/(kg)

 

formula: WSF = Q- ΔH m=p1V1/RT1 T2= T1(p2/p1)(k-1)/k

55.       A carnot power cycle operates on 2 lb of air between the limits of 71 °F and 500°F. The pressure at the beginning of isothermal expansion is 400 psia and at the end of isothermal expansion is 185psig. Determine the volume at the end of isothermal compression.

a.         a. 7.849 ft3

b.         b. 7.850 ft3

c.         c. 7.851 ft3

d.         d. 7852 ft3

formula: V= mRT/ P P3= P2[T3/ T2]

56.       During a polytropic process,10lb of an ideal gas, whose R=

 

(K),-787.4 kJ/kg

a.         c) 304.2°C, -803.2 kJ/kg, -89.15 kJ/kg, -2.7505 kJ/(kg)(K),

-987.4 kJ/kg

b.         d) 279.4°C, 439.7kJ/kg, 79.4kJ/kg, 3.0327kJ/(kg)(K),

602.1 kJ/kg

Formula of #1and #2: ?u = u2 –u1, W = p(v2-v1), ?s =s2-s1, Q = h2 –h1

57. At throttling calorimeter receives steam from a boiler drum at0.11MPa and is superheated by 10 degrees. If the boiler drum pressure is 1.55 MPa, what is the quality of the steam generated by the boiler?

 

 

 

 

 

 

•          c. 1.456

•          d. 1.356

formula: [ p2/p1]n-1 / n = T2/T1

58. A steam calorimeter receives steam from a pipe at 0.1 MPa and 20°SH. For a pipe steam pressure of 2 MPa, what is the quality of the steam?

 

 

 

 

 

 

•          c. 559.4K

•          d. 669.4K

formula: cp = kR/ k-1 Q= mcp(T2-T1)

59.       A certain gas, with cp = 0.529Btu/ lb. °Rand R = 96.2ft.lb/lb.

°R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5psia. Compute for T2.

•          a.1520°R

•          b. 1620°R

•          c. 1720°R

•          d. 1820°R

formula: T2= T1V2/V1

60.       A System has a temperature of 250°F. Convert this Value to

°R?

a.         a. 740°R

b.         b.730°R

c.         c. 720°R

d.         d. 710°R

formula: °R= °F + 460

61.       Steam with a specific volume of 0.09596 m³/kg undergoes a constant pressure process at 1.70 MPa until the specific volume becomes 0.13796 m³/kg. What are (a) the final temperature, (b)

?u, (c) W, (d)?s, and (e) Q?

a.         a) 265.4°C, 430.7kJ/kg, 71.4kJ/kg, 1.0327kJ/(kg) (K),502.1 kJ/kg

b.         b) 204.2°C, -703.2 kJ/kg, -84.15 kJ/kg, -1.7505 kJ/(kg)(K),

-787.4 kJ/kg

c.         c) 304.2°C, -803.2 kJ/kg, -89.15 kJ/kg, -2.7505 kJ/(kg)(K),

-987.4 kJ/kg

d.         d) 279.4°C, 439.7kJ/kg, 79.4kJ/kg, 3.0327kJ/(kg)

(K),602.1 kJ/kg

62.       Steam with an enthalpy of 2843.5 kJ/kg undergoes a constant pressure process at 0.9 MPa until the enthalpy becomes 2056.1 kJ/kg. What are (a) the initial temperature or quality, (b)

?u, (c)W, (d) ?s, and(e) Q?

389. The pressure gauge on a 2000 m³ tank of oxygen gas reads 600 kPa. How much volumes will the oxygen occupied at

 

Formula: h1 = hf1 + x1hfg1

63.       A 1-kg steam-water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and the temperature to 400°. Determine the heat added.

a.         a) 1378.7 kJ

b.         b) 1348.5 kJ

c.         c) 1278,7 kJ

d.         d) 1246,5 kJ

Formula: Q = (h2 – p2v2) –(h1 –p1v1)

64.       Water vapor at 100 KPa and 150°C is compressed isothermally until half the vapor has condensed. How much work must be performed on the steam in this compression process per kilogram?

a.         a) -1384.7 kJ

b.         b) 1384.7 kJ

c.         c) -2384.7 kJ

d.         d) 2384.7 kJ

65.       Wet steam at 1 MPa flowing through a pipe is throttled to a pressure of 0.1 MPa. If the throttling temperature is110°C, What is the quality of the steam in the pipe?

a.         a) 96%

b.         b) 86%

c.         c) 76%

d.         d) 66%

66.       Steam is throttled to 0.1 MPa with 20 degrees of superheat.

(a)        What is the quality of throttled steam if its pressure is 0.75 MPa (b) What is the enthalpy of the process?

•          a) 97.6%,2713 kJ/kg

•          b) -97.6%, 2713 kJ/kg

•          c) 87.6%,3713 kJ/kg

•          d) -87.6%, 3713 kJ/kg

 

joules/calorie

67. 3 horsepower (hp) =         watts?

•          a) 1492 watts

 

pressure of the outside air 100 kPa?

•          a) 14026.5 m³

•          b) 15026.5 m³

•          c) 13026.5 m³

•          d) 16026.5 m³ Formula: P1V1/T1 =P2V2/T2

68.       Assuming compression is according to the Law PV = C, Calculate the initial volume of the gas at a pressure of 2 bars w/c will occupy a volume of 6m³ when it is compressed to a pressure of 42 Bars.

a.         a) 130m³

b.         b) 136m³

c.         c) 120m³

d.         d) 126m³

Formula: P1V1/T1 =P2V2/T2

69.       A Gas tank registers1000 kPa. After some gas has been used, the gauge registers 500 kPa. What percent of the gas remains in the tank?

a.         a) 64.40%

b.         b) 74.60%

c.         c) 58.40%

d.         d) 54.60%

Formula: Pabs = Patm + Pgage & %= P2/P1 * 100%

70.       The volume of a gas under standard atmospheric pressure & 76 cmHg is 200m³. What is the volume when pressure is 80 cmHg if the temperature is unchanged?

a.         a) 180 in³

b.         b) 170 in³

c.         c) 160 in³

d.         d) 190 in³ Formula: P2V2 = P1V1

71.       While swimming at depth of120m in a fresh water lake, A fish emits an air bubbles of volume 2.0mm³ atmospheric pressure is 100kPa. What is the pressure of the bubble?

a.         a) 217.7 kPa

b.         b) 317.7 kPa

c.         c) 417.7 kPa

d.         d) 517.7 kPa Formula: P= δh

72.       How many joules of work is the equivalent of 15000 cal of heat?

a.         a) 62850 joules

b.         b) 3579.95 joules

c.         c) 14995.81 joules

d.         d) 15004.19 joules Formula: J =Work/Heat

J = mechanical equivalent of heat whose value is 4.19 joules/calorie

73.       Two thick slices of bread, when completely oxidized by the body, can supply 200,000 cal of heat. How much work is this equivalent to?

a.         a) 4,190,000 joules

b.         b) 8,390,000 joules

c.         c) 839,000 joules

d.         d) 419 000 joules Formula: J =Work/Heat

J = mechanical equivalent of heat whose value is 4.19

74. The first law of thermodynamics may be expressed in the following equivalent

 

•          b) 2238 watts

•          c) 746 watts

•          d) 2238 kilowatts Formula: 1hp= 746 watts

75.       How many Newton’s (N) in 900,000 dynes?

a.         a) 8 Newton’s

b.         b) 9 Newton’s

c.         c) 7 Newton’s

d.         d) 6 Newton’s

Formula: 1Newton (N)=100,000dynes

76.       Calculate the power output in horsepower of an 80-kg man that climbs a flight of stairs 3.8 m high in 4.0 s.

a.         a) 744.8 hp

b.         b) 0.998 hp

c.         c) 746 hp

d.         d) 1.998 hp

Formula: Power = Fd/t = mgh/t F = W = mg

d = h

77.       How many calories of heat will be needed to raise the temperature of 200 g of iron from 27°C to 80°C? (c = 0.11 cal/g.

°C)

a.         a) 1.16 kcal

b.         b) 2166 cal

c.         c) 3.16 kcal

d.         d) 4166 cal Formula: H = mc?T

78.       100g of iron was heated to 100°C and mixed with 22g of water at 40°C. The final temperature of the mixture was 60°C. Show that the heat given off by the iron equals the heat absorbed by the water.

a.         a) 440 cal

b.         b) 540 cal

c.         c) 340 cal

d.         d) 640 cal

Formula: H (given off by iron) = H (absorbed by water), mc?T(iron)= mc?T(water)

79.       An engineering science primarily concerned with heat and work conversions.

a.         a. Thermodynamics

b.         b. Mechanics

c.         c. Physics

d.         d. Electromagnetic

80.       “If the temperature o f a fixed quantity of a gas is held constant during a change of state, the volume varies inversely with the absolute pressure.

a.         a. Charle’s Law

b.         b. Boyle’s Law

c.         c. Dalton’s Law

d.         d. Amagat’s Law

81.       Avogadro’s Number NA

a.         a. 6.2205 x 10^23 mol-1

b.         b. 6.2025 x 10^23 mol-1

c.         c. 6.0225 x 10^23 mol-1

d.         d. 6.2250 x 10^23 mol-1

e.         b. < 1

f.          c. = 1

 

g.         a. the net heat transfer id equal to the network

h.         b. the sum of the total energy forms leaving the system boundary is always equal to the energy input

i.          c. energy can neither be created nor destroyed but only

converted from one form to another

j.          d. all of the above

82.       A system whose boundary does not allow the exchange of either matter or energy with the surrounding

a.         a. open system

b.         b. closed system

c.         c. isolated system

d.         d. none of the above

83.       The specific terms used in phase transitions

a.         a. melting

b.         b. evaporation

c.         c. freezing

d.         d. sublimation

84.       The density of water at 4°C is

a.         a. 1 gm/cm³

b.         b. 2 gm/cm³

c.         c. 3 gm/cm³

d.         d. 4 gm/cm³

85.       Archimedes principle states that

a.         a. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is equal to the weight of the displaced fluid

b.         b. when a body is inversed in a fluid, the fluid exerts a

upward force on the body whose magnitude is equal to the weight of the displaced fluid.

c.         c. when a body is inversed in a fluid, the fluid exerts a

downward force on the body whose magnitude is greater than the weight of the displaced fluid.

d.         d. when a body is inversed in a fluid, the fluid exerts a

downward force on the body whose magnitude is lower than the weight of the displaced fluid.

86.       Types of system except one

a.         a. closed

b.         b. open

c.         c. isolated

d.         d. solid

87.       Isometric process is

a.         a. T = P

b.         b. P = C

c.         c. V = C

d.         d. T = V

88.       The ratio of the change in energy in the form of the heat

a.         a. relative density

b.         b. specific heat

c.         c. specific gravity

d.         d. none of the above

89.       Specific heat ratio is always

90. It is a region enclosed by specified boundaries, which may be imaginary, either fixed or moving

 

•          d. none of the above

90.       It states that mass is a commodity that can neither be heated nor destroyed with the exception of nuclear processes where the conversion of mass into energy is a fundamental principle

a.         a. Law of Conservation of Mass

b.         b. Law of Conservation of Energy

c.         c. Law of Conservation of Power

d.         d. Law of Conservation of Heat

91.       The energy that stored in a system as a result of its position in the earth’s gravitational field

a.         a. elastic energy

b.         b. kinetic energy

c.         c. potential energy

d.         d. flow energy

92.       It involves a force deforming a solid body

a.         a. non-elastic work

b.         b. non-flow work

c.         c. flow work

d.         d. elastic work

93.       Developed the Fahrenheit scale

a.         a. Gabriel Daniel Fahrenheit

b.         b. Daniel Gabriel Fahrenheit

c.         c. Gabriel Danelle Fahrenheit

d.         d. Danelle Gabriel Fahrenheit

94.       Developed the centigrade or Celsius

a.         a. Andres Celsius

b.         b. Anders Celsius

c.         c. Andrew Celsius

d.         d. Anthony Celsius

95.       Instrument used to measure the absolute pressure of the atmosphere

a.         a. galvanometer

b.         b. thermometer

c.         c. barometer

d.         d. pressure gages

96.       A vector quantity whose direction is the same as the direction of the velocity

a.         a. Force

b.         b. Momentum

c.         c. Friction

d.         d. Resultant

97.       Conceptualize that the heat was an energy form and that there was a precise relationship between heat and work.

a.         a. Count Rumford

b.         b. Sir Humpry Davey

c.         c. James Prescott

d.         d. all of the above

98.       Which is true:

a.         a. Energy is a scalar quantity

b.         b. Energy is a vector quantity

c.         c. Energy is vector & scalar

d.         d. None of the above

e.         d. Joule's Law

99. A    is used to measure atmospheric pressure

 

•          a. Isolated system

•          b. Open system

•          c. System

•          d. None of the above

100.     Amount or volume of liquid that pass in a given limit of time

a.         a. Flow rate

b.         b. Volume

c.         c. Time

d.         d. None of the above

 

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