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# Multiple choice question for engineering

## Set 1

1. The quantity of solute per unit volume is __________
a) Mole
b) Concentration
c) Density
d) None of the mentioned

Answer: [Reason:] The quantity of solute per unit volume is concentration.

2. Find the correct statement for ppm
a) For solids and liquids, it is mole ratio
b) For gases, it is mole ratio
c) It is mole ration for every phase of matter
d) It is mass ratio for every phase of matter

Answer: b [Reason:] For gases, it is mole ratio and for liquids and solids, it is mass ratio.

3. The concentration of 0.02 M H2SO4 molecules in a solution where the ionization of H2SO4 is 30%.
a) 0.014
b) 0.003
c) 0.002
d) 0.005

Answer: a [Reason:] The remaining concentration of H2SO4 molecules is = 0.02-0.02*0.30.

4. What is the weight fraction of N2 in a gas when it is liquefied? The gas contains 400 ppm of N2 in CO2.
a) 2.54×10-4
b) 3.54×10-4
c) 4.54×10-4
d) 5.54×10-4

Answer: a [Reason:] Basis: 106 mole gas.

5. A student has two solution of a substance. Solution-1: 25M, 400mL and Solution-2: 30M, 300M. What is the molarity of the final solutions if these two solutions are mixed?
a) 27.14
b) 22.14
c) 14.22
d) 14.27

Answer: a [Reason:] M = (M1V1 + M2V2 )/(V1 + V2).

6. What is the total hardness of water in mg/L if the concentration of Ca and Mg are 56.7 mg/L and 9.8 mg/L?
a) 182.1
b) 66.5
c) 133
d) 91.05

Answer: a [Reason:] g CaCO3 /g Ca= 2.5 and g CaCO3 /g Mg = 4.118 Hardness of water = 2.5(56.7) + 4.118(9.8).

7. What is the concentration of 36 grams of water occupying 1 m3 volume?
a) 1 mole / m3
b) 2 mole / m3
c) 11 mole / m3
d) 22 mole / m3

Answer: b [Reason:] Moles of water= 36/18 = 2, Concentration = 2/1= 1 mole / m3.

8. What is the concentration (% m/v) of the solution that contains 20.0 g NaCl in 800.0 mL solution?
a) 5.00%
b) 2.00%
c) 0.200%
d) 2.50%

Answer: d [Reason:] Concentration = 20/800= 0.025 gm/ml.

9. What is the ppm concentration of 6.00 mL sample of solution that has 3.6 x 10-4 g of sodium ions?
a) 20
b) 40
c) 60
d) 80

Answer: c [Reason:] Concentration parts per million.

10. How many mL of 2.50% (m/v) NaOH solution would contain 3.50 g of NaOH?
a) 7
b) 14
c) 21
d) 28

Answer: b [Reason:] % (m/v) = 0.025 = 3.5/v.

## Set 2

1. The quantity of solute per unit volume is __________
a) Mole
b) Concentration
c) Density
d) None of the mentioned

Answer: [Reason:] The quantity of solute per unit volume is concentration.

2. Find the correct statement for ppm
a) For solids and liquids, it is mole ratio
b) For gases, it is mole ratio
c) It is mole ration for every phase of matter
d) It is mass ratio for every phase of matter

Answer: b [Reason:] For gases, it is mole ratio and for liquids and solids, it is mass ratio.

3. The concentration of 0.02 M H2SO4 molecules in a solution where the ionization of H2SO4 is 30%.
a) 0.014
b) 0.003
c) 0.002
d) 0.005

Answer: a [Reason:] The remaining concentration of H2SO4 molecules is = 0.02-0.02*0.30.

4. What is the weight fraction of N2 in a gas when it is liquefied? The gas contains 400 ppm of N2 in CO2.
a) 2.54×10-4
b) 3.54×10-4
c) 4.54×10-4
d) 5.54×10-4

Answer: a [Reason:] Basis: 106 mole gas.

5. A student has two solution of a substance. Solution-1: 25M, 400mL and Solution-2: 30M, 300M. What is the molarity of the final solutions if these two solutions are mixed?
a) 27.14
b) 22.14
c) 14.22
d) 14.27

Answer: a [Reason:] M = (M1V1 + M2V2 )/(V1 + V2).

6. What is the total hardness of water in mg/L if the concentration of Ca and Mg are 56.7 mg/L and 9.8 mg/L?
a) 182.1
b) 66.5
c) 133
d) 91.05

Answer: a [Reason:] g CaCO3 /g Ca= 2.5 and g CaCO3 /g Mg = 4.118 Hardness of water = 2.5(56.7) + 4.118(9.8).

7. What is the concentration of 36 grams of water occupying 1 m3 volume?
a) 1 mole / m3
b) 2 mole / m3
c) 11 mole / m3
d) 22 mole / m3

Answer: b [Reason:] Moles of water= 36/18 = 2, Concentration = 2/1= 1 mole / m3.

8. What is the concentration (% m/v) of the solution that contains 20.0 g NaCl in 800.0 mL solution?
a) 5.00%
b) 2.00%
c) 0.200%
d) 2.50%

Answer: d [Reason:] Concentration = 20/800= 0.025 gm/ml.

9. What is the ppm concentration of 6.00 mL sample of solution that has 3.6 x 10-4 g of sodium ions?
a) 20
b) 40
c) 60
d) 80

Answer: c [Reason:] Concentration parts per million.

10. How many mL of 2.50% (m/v) NaOH solution would contain 3.50 g of NaOH?
a) 7
b) 14
c) 21
d) 28

Answer: b [Reason:] % (m/v) = 0.025 = 3.5/v.

## Set 3

1. ________ is the change of vapour in a non-condensable gas.
a) Saturation
b) Vaporization
c) Condensation
d) None of the mentioned

Answer: c [Reason:] Condensation is the change of vapour in a non-condensable gas.

2. In a condensation process, _______ to _________
a) Gas, Solid
b) Gas, Liquid
c) Liquid, Gas
d) Liquid, Solid

Answer: b [Reason:] In a condensation process, Gas to Liquid.

3. When vapour is cooled at constant total system volume, the _______ changes.
a) Volume
b) Pressure
c) Temperature
d) None of the mentioned

Answer: b [Reason:] When vapour is cooled at constant total system volume, the pressure changes.

4. When vapour is compressed isothermally the ____________ changes.
a) Volume
b) Pressure
c) Temperature
d) None of the mentioned

Answer: a [Reason:] When vapour is compressed isothermally the volume changes.

5. Condensation starts ________ point.
a) Dew point
b) Bubble point
c) Triple point
d) None of the mentioned

Answer: a [Reason:] Condensation starts Dew point.

6. When gas changes to liquid through the process of condensation, the temperature
a) Increases
b) Decreases
c) Remains constant
d) None of the mentioned

Answer: c [Reason:] Temperature is constant during condensation.

7. When the vapour is condensed at constant system pressure, the pressure changes.
a) Correct statement
b) Incorrect statement
c) Can`t say anything
d) None of the mentioned

Answer: a [Reason:] When the vapour is condensed at constant system pressure, the pressure changes.

8. If the fraction of water vapour at 127 Degree Celsius and 1 atm is 0.5, what is the fraction of water vapour at 27 Degree C and 1 atm?
a) 0.275
b) 0.375
c) 0.475
d) 0.875

Answer: b [Reason:] Fraction = 0.5*300/400 = 0.375.

9. Leonard set up the experiment shown below.

9. Correct statement is/are
A: Steam is formed when water boils.
B: water vapour loses heat during condensation.
a) Both A and B
b) Neither A nor B
c) Only A
d) Only B

Answer: a [Reason:] Boiling of water forms steam and due to heat loss condensation is occurring.

10. Water changes into water vapour only when boiling occurs. The statement is
a) Correct
b) Incorrect
c) Always correct
d) None of the mentioned

Answer: b [Reason:] In other operation as well water result in vapour.

## Set 4

1. __________ are statements of equivalent values of different units in the form of ratios.
a) Fraction factor
b) Conversion factor
c) Expand factor
d) None of the mentioned

Answer: b [Reason:] Conversion factor are statements of equivalent values of different units in the form of ratios.

2. Which one is an incorrect conversion
a) 1 inch = 2.54 cm
b) 1 mile = 5280 ft.
c) 1 ft. = 12 inch
d) None of the mentioned

Answer: d [Reason:] All above mentioned are correct conversions of length.

3. A car is travelling with a speed of 550 ft/sec. How fast it is going in miles per hour?
a) 375
b) 750
c) 900
d) 1800

Answer: a [Reason:] 1 mile = 5280 ft and 1 hour = 3600 sec.

4. 30 (in)(cm2)/(yr)(s)(lbm)(ft2) to all SI units.
a) 5.72×10-11
b) 4.76×10-12
c) 8.73×10-11
d) 4.45×10-12

Answer: a [Reason:] 1 lbm = 454 g, 1 ft = 12×2054 centimetres and 1yr = 365×24×60×60 sec.

5. Oil is flowing through a 4 in.-diameter pipe having a velocity of 6 ft/sec. The flow rate gallon per minute and kinetic energy of water in (ft)(lbf)/lbm are respectively?
a) 469.92 and 1.12
b) 352.44 and 0.84
c) 234.96 and 0.56
d) 117.48 and 0.28

Answer: c [Reason:] K.E. = 0.5mv2 and Q = Av.

6. What is the potential energy of a box in (ft)(lbf), kept on a wall having a height 20 ft above the surface? Assume that the mass of the box is 100 lb.
a) 1000
b) 2000
c) 3000
d) 4000

Answer: b [Reason:] PE = mgh, g = 32.2 ft/s2.

7. What is the value of 200 ft3/min in mile3/day?
a) 0.95×10-6
b) 1.95×10-6
c) 0.95×106
d) 1.95×106

Answer: b [Reason:] 1 mile = 5280 ft and 1 day = 24*60 minutes.

8. 1.5 nm. is equal to
a) 1.5*10^-8 dm
b) 0.15 Angstrom
c) 5.9*10^-10 in
d) All of the mentioned

Answer: d [Reason:] 1 in. = 2.54 cm, 1 Angstrom = 10*^-10 meter, 1 meter = 0.1 dm.

9. Acceleration of gravity in AE system is equal to
a) 0.32174 ft/s2
b) 3.2174 ft/s2
c) 32.174 ft/s2
d) 321.74 ft/s2

Answer: c [Reason:] Acceleration of gravity in AE system is equal to 32.174 ft/s2.

10. Fundamental unit for the length in metric system is
a) cm
b) m
c) in
d) yd

Answer: b [Reason:] Fundamental unit for the length in metric system is meter (m).

## Set 5

1. __________ are statements of equivalent values of different units in the form of ratios.
a) Fraction factor
b) Conversion factor
c) Expand factor
d) None of the mentioned

Answer: b [Reason:] Conversion factor are statements of equivalent values of different units in the form of ratios.

2. Which one is an incorrect conversion
a) 1 inch = 2.54 cm
b) 1 mile = 5280 ft.
c) 1 ft. = 12 inch
d) None of the mentioned

Answer: d [Reason:] All above mentioned are correct conversions of length.

3. A car is travelling with a speed of 550 ft/sec. How fast it is going in miles per hour?
a) 375
b) 750
c) 900
d) 1800

Answer: a [Reason:] 1 mile = 5280 ft and 1 hour = 3600 sec.

4. 30 (in)(cm2)/(yr)(s)(lbm)(ft2) to all SI units.
a) 5.72×10-11
b) 4.76×10-12
c) 8.73×10-11
d) 4.45×10-12

Answer: a [Reason:] 1 lbm = 454 g, 1 ft = 12×2054 centimetres and 1yr = 365×24×60×60 sec.

5. Oil is flowing through a 4 in.-diameter pipe having a velocity of 6 ft/sec. The flow rate gallon per minute and kinetic energy of water in (ft)(lbf)/lbm are respectively?
a) 469.92 and 1.12
b) 352.44 and 0.84
c) 234.96 and 0.56
d) 117.48 and 0.28

Answer: c [Reason:] K.E. = 0.5mv2 and Q = Av.

6. What is the potential energy of a box in (ft)(lbf), kept on a wall having a height 20 ft above the surface? Assume that the mass of the box is 100 lb.
a) 1000
b) 2000
c) 3000
d) 4000

Answer: b [Reason:] PE = mgh, g = 32.2 ft/s2.

7. What is the value of 200 ft3/min in mile3/day?
a) 0.95×10-6
b) 1.95×10-6
c) 0.95×106
d) 1.95×106

Answer: b [Reason:] 1 mile = 5280 ft and 1 day = 24*60 minutes.

8. 1.5 nm. is equal to
a) 1.5*10^-8 dm
b) 0.15 Angstrom
c) 5.9*10^-10 in
d) All of the mentioned

Answer: d [Reason:] 1 in. = 2.54 cm, 1 Angstrom = 10*^-10 meter, 1 meter = 0.1 dm.

9. Acceleration of gravity in AE system is equal to
a) 0.32174 ft/s2
b) 3.2174 ft/s2
c) 32.174 ft/s2
d) 321.74 ft/s2