# Multiple choice question for engineering

## Set 1

1. What is the change in internal energy for a process which has final and initial states are exactly similar?

a) Positive

b) Negative

c) Zero

d) Cannot say

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2. What is the change in internal energy of 2 mole of air (C_{v} = 2.1 X 10^{4} J/mole^{o}C), if its temperature changes from 10^{o}C to 20^{o}C?

a) 420 kJ

b) 540 kJ

c) 840 kJ

d) 1050 kJ

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3. What is the change in internal energy of 1 mole of air ((C_{v} = 2.1 X 10^{4} J/mole^{o}C), if its temperature changes from 10^{o}C to 5^{o}C?

a) 84 kJ

b) 105 kJ

c) – 84 kJ

d) – 105 kJ

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4. Ratio of change in internal energy of a substance from 4^{o}C to T and from T to 10^{o}C is 2, what is T?

a) 5^{o}C

b) 6^{o}C

c) 7^{o}C

d) 8^{o}C

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^{o}C.

5. Ratio of change in internal energy of a substance from 15^{o}C to T and from T to 10^{o}C is – 2, what is T?

a) 5^{o}C

b) 15^{o}C

c) 20^{o}C

d) 30^{o}C

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^{o}C.

6. Total energy of the universe is always ______

a) Increasing

b) Decreasing

c) Constant

d) Cannot say

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7. A stone has initial potential and kinetic energy as 10 J and 5 J respectively, if the final potential energy of the stone is 15 J what is its final kinetic energy?

a) 0

b) 5 J

c) 10 J

d) 15 J

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8. A stone has initial potential and kinetic energy as 5 J and 20 J respectively, if the final kinetic energy of the stone is 15 J what is its final potential energy?

a) 0

b) 10 J

c) 15 J

d) 25 J

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9. A stone has initial potential, kinetic and internal energy 4 J, 15 J and 20 J respectively, if the final kinetic energy and potential energy of the stone is 5 J and 10 J respectively, what is the final internal energy?

a) 15 J

b) 20 J

c) 24 J

d) 32 J

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10. A stone has initial potential, kinetic and internal energy 7 J, 10 J and 2x J respectively, if the final kinetic energy, potential energy and internal energy are 5 J, 21 J and x respectively, what is the final internal energy?

a) 2 J

b) 4 J

c) 5 J

d) 9 J

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## Set 2

1. Which of the following does the concept of material balance based upon?

a) Conservation of mass

b) Conservation of energy

c) Conservation of momentum

d) Conservation of Volume

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2. The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following?

a) Initial condition – Sum of inputs

b) Initial condition + Sum of inputs

c) Sum of inputs – Initial condition

d) None of the mentioned

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3. A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water?

a) 7 grams

b) 10 grams

c) 13 grams

d) 15 grams

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4. 10 moles of O_{2} is added to 10 moles of H_{2}, how many moles of H_{2}O will it produce?

a) 5

b) 10

c) 15

d) 20

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_{2}+ O

_{2}-> 2H

_{2}O, => Moles of H

_{2}O = Moles of H

_{2}= 10.

5. A combustion reaction has reactants 1 mole of C_{x}H_{y} and 2 moles of O_{2} and products 1 mole of CO_{2} and 2 mole of H_{2}O, what is x + y?

a) 1

b) 3

c) 4

d) 5

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6. In a random reaction 2 mole of CH_{4} and 1 mole of C_{2}H_{4} are reacted, and 1 mole of C_{3}H_{8} and 1 mole of C_{x}H_{y} are produced, what is x*y?

a) 2

b) 4

c) 8

d) 12

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7. A reaction has reactants 2 moles of NaOH and 1 mole of H_{2}SO_{4}, and products Na_{2}SO_{4} and H_{2}O, what are the total moles of products?

a) 1

b) 2

c) 3

d) 4

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8. A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?

a) 2

b) 4

c) 6

d) 8

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9. 10 moles of A were present in a system initially, and 10 moles are added to it, it follows the reaction 4A -> B, what are number of moles of B produced?

a) 5

b) 10

c) 15

d) 20

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10. 10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what are number of moles of B produced?

a) 5

b) 10

c) 25

d) 50

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11. There were 10 moles of a substance present initially in a system, 5 moles were added to it and a reaction occurred so that its moles are reduced by 20%, what are the final moles of substance in the system?

a) 10

b) 12

c) 15

d) 18

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12. There were 15 moles of a substance present initially in a system, 25 moles were added to it and a reaction occurred so that its moles are reduced by 50%, what are the final moles of substance in the system?

a) 10

b) 15

c) 20

d) 40

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13. 10 moles of A were present in a system initially, and 12 moles of C are added to it, it undergoes the reaction 2A + 3C -> 2B, what are number of moles of B produced?

a) 4

b) 5

c) 8

d) 12

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14. 10 moles of A were present in a system initially, and 8 moles of C are added to it, it undergoes the reaction 5A + 3C -> 4B, what are number of moles of B produced?

a) 4

b) 6

c) 8

d) 10

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15. 8 moles of A were present in a system initially, and 24 moles of B are added to it, it undergoes the reaction 2A + 3B -> 4C + 5D, what are number of moles of D produced?

a) 10

b) 20

c) 30

d) 40

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## Set 3

1. What is the percentage of excess air, if 10 moles of air entered the process and only 5 moles of that are required?

a) 10%

b) 50%

c) 75%

d) 100%

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2. What is the percentage of excess air if 50 grams of air is in excess and 150 grams of air enters the process?

a) 10%

b) 25%

c) 50%

d) 100%

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3. 10 moles of ethane is supplied with 49 moles of oxygen, what is the percentage of excess oxygen?

a) 20%

b) 40%

c) 50%

d) 70%

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_{2}H

_{6}+ 3.5O

_{2}-> 2CO

_{2}+ 3H

_{2}O, => O

_{2}required = 3.5*10 = 35 moles, => percentage of excess oxygen = 100*(49 – 35)/35 = 40%.

4. The extent of a reaction is 10, and the stoichiometric coefficient of O_{2} is 2.5, if the moles of O_{2} entering the process is 45, what is the percentage of excess air?

a) 20%

b) 40%

c) 60%

d) 80%

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_{2}required = 10*2.5 = 25, => Percentage of excess air = 100*(45 – 25)/25 = 80%.

5. 144 grams of C_{5}H_{12} is burnt with 64 grams O_{2}, and 44 grams of CO_{2} is formed, what is the percentage of excess O_{2}?

a) 25%

b) 50%

c) 75%

d) 100%

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_{5}H

_{12}+

_{2}-> 5CO

_{2}+ 6H

_{2}O, => Extent of reaction = (44/44 – 0)/5 = 0.2. Moles of O

_{2}entered the process = 64/32 = 2, Moles of O

_{2}required = 0.2*8 = 1.6, => Percentage of excess oxygen = 100*(2 – 1.6)/1.6 = 25%.

6. Ethene is burnt with 50% of excess air, what is the percentage of CO_{2} in the products?

a) 11.11%

b) 36.36%

c) 66.66%

d) 72.72%

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_{2}H

_{4}+ 3O

_{2}-> 2CO

_{2}+ 2H

_{2}O. Basis: 10 moles of C

_{2}H

_{4}, => moles of O

_{2}reacted = 30, => moles of O

_{2}entered the process = 45, => moles of CO

_{2}, H

_{2}O and O

_{2}in products are 20, 20 and 15 respectively, => percentage of CO

_{2}= 20/55*100 = 36.36%.

7. Ethene is burnt with 150% of excess air, what is the percentage of O_{2} in the products?

a) 12.5%

b) 33.3%

c) 45.4%

d) 52.9%

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_{2}H

_{4}+ 3O

_{2}-> 2CO

_{2}+ 2H

_{2}O. Basis: 10 moles of C

_{2}H

_{4}, => moles of O

_{2}reacted = 30, => moles of O

_{2}entered the process = 75, => moles of CO

_{2}, H

_{2}O and O

_{2}in products are 20, 20 and 45 respectively, => percentage of O

_{2}= 45/85*100 = 52.9%.

8. Pentane is burnt with 100% of excess air, what is the percentage of H_{2}O in the products?

a) 12.4%

b) 34.6%

c) 42.1%

d) 56.9%

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_{5}H

_{12}+

_{2}-> 5CO

_{2}+ 6H

_{2}O. Basis: 10 moles of C

_{5}H

_{12}, => moles of O

_{2}reacted = 80, => moles of O2 entered the process = 160, => moles of CO

_{2}, H

_{2}O and O

_{2}in products are 50, 60 and 80, => percentage of H

_{2}O = 80/190*100 = 42.1%.

9. Propane is burnt with 20% excess O_{2}, what is the percentage of CO_{2} in products?

a) 12.5%

b) 25%

c) 45%

d) 75.5%

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_{3}H

_{8}+ 5O

_{2}-> 3CO

_{2}+ 4H

_{2}O. Basis: 10 moles of C

_{3}H

_{8}, => moles of O

_{2}reacted = 50, => moles of O

_{2}entered the process = 60, => moles of CO

_{2}, H

_{2}O and O

_{2}in products are 30, 40 and 10, => percentage of CO

_{2}= 10/80*100 = 12.5%.

10. Octane is burnt with 40% excess O_{2}, what is the percentage of CO_{2} in products?

a) 18.18%

b) 36.36%

c) 54.54%

d) 72.72%

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_{8}H

_{18}+ 12.5O

_{2}-> 8CO

_{2}+ 9H

_{2}O. Basis: 10 moles of C

_{8}H

_{18}, => moles of O

_{2}reacted = 125, => moles of O

_{2}entered the process = 175, => moles of CO

_{2}, H

_{2}O and O

_{2}in products are 80, 90 and 50, => percentage of CO

_{2}= 80/220*100 = 36.36%.

11. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O_{2}, N_{2}, CO_{2} and H_{2}O, what is the rate of products?

a) 900 moles

b) 950 moles

c) 1000 moles

d) 1050 moles

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_{4}+ 2O

_{2}-> CO

_{2}+ 2H

_{2}O. O

_{2}supplied = 1000*21/100 = 210 moles, N

_{2}supplied = 1000*79/100 = 790 moles, => O

_{2}unreacted = 210 – 100 = 110 moles, CO

_{2}formed = 50 moles, H

_{2}O formed = 100 moles. => Rate of products = 790 + 110 + 50 + 100 = 1050 moles.

12. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O_{2}, N_{2}, CO_{2} and H_{2}O, what is the percentage of O_{2} in products?

a) 10.4%

b) 25.8%

c) 45.6%

d) 78.2%

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_{4}+ 2O

_{2}-> CO

_{2}+ 2H

_{2}O. O

_{2}supplied = 1000*21/100 = 210 moles, N

_{2}supplied = 1000*79/100 = 790 moles, => O

_{2}unreacted = 210 – 100 = 110 moles, CO

_{2}formed = 50 moles, H

_{2}O formed = 100 moles. => Percentage of O

_{2}= 110/1050*100 = 10.4%.

13. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O_{2}, N_{2}, CO_{2} and H_{2}O, what is the percentage of CO_{2} in products?

a) 4.7%

b) 10.4%

c) 16.5%

d) 24.3%

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_{4}+ 2O

_{2}-> CO

_{2}+ 2H

_{2}O. O

_{2}supplied = 1000*21/100 = 210 moles, N

_{2}supplied = 1000*79/100 = 790 moles, => O

_{2}unreacted = 210 – 100 = 110 moles, CO

_{2}formed = 50 moles, H

_{2}O formed = 100 moles. => Percentage of CO

_{2}= 50/1050*100 = 4.7%.

14. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O_{2}, N_{2}, CO_{2} and H_{2}O, what is the percentage of N_{2} in products?

a) 25.4%

b) 45.2%

c) 75.2%

d) 95.6%

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_{4}+ 2O

_{2}-> CO

_{2}+ 2H

_{2}O. O

_{2}supplied = 1000*21/100 = 210 moles, N

_{2}supplied = 1000*79/100 = 790 moles, => O

_{2}unreacted = 210 – 100 = 110 moles, CO

_{2}formed = 50 moles, H

_{2}O formed = 100 moles. => Percentage of N

_{2}= 790/1050*100 = 75.2%.

15. Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O_{2}, N_{2}, CO_{2} and H_{2}O, what is the percentage of H_{2}O in products?

a) 5.8%

b) 9.5%

c) 15.4%

d) 20.7%

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_{4}+ 2O

_{2}-> CO

_{2}+ 2H

_{2}O. O

_{2}supplied = 1000*21/100 = 210 moles, N

_{2}supplied = 1000*79/100 = 790 moles, => Osub>2 unreacted = 210 – 100 = 110 moles, COsub>2 formed = 50 moles, Hsub>2O formed = 100 moles. => Percentage of H

_{2}O = 100/1050*100 = 9.5%.

## Set 4

1. What is the value of P in the following process?

a) 5 mole

b) 10 mole

c) 15 mole

d) 20 mole

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2. What is the value of P in the following process?

a) 5 mole

b) 15 mole

c) 25 mole

d) 35 mole

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3. What is the value of P in the following process?

a) 5 mole

b) 10 mole

c) 15 mole

d) 20 mole

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4. What is the value of F*P in the following process?

a) 25

b) 125

c) 150

d) 225

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5. What is the value of H/P in the following process, if 2P + H = 16?

a) 1

b) 3

c) 6

d) 8

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Answer the following questions 6 – 10 for the diagram.

6. What is the value of B?

a) 100 Kg/hr

b) 200 Kg/hr

c) 300 Kg/hr

d) 400 Kg/hr

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7. What is the value of C?

a) 400 Kg/hr

b) 689.5 Kg/hr

c) 819.6 Kg/hr

d) 959.2 Kg/hr

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8. What is the value of W?

a) 159.2 Kg/hr

b) 281.3 Kg/hr

c) 465.7 Kg/hr

d) 633.8 Kg/hr

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9. What is the value of F?

a) 98.5 Kg/hr

b) 131.1 Kg/hr

c) 167.7 Kg/hr

d) 256.4 Kg/hr

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10. What is the value of D?

a) 32.3 Kg/hr

b) 49.1 Kg/hr

c) 85.6 Kg/hr

d) 105.3 Kg/hr

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11. How many independent equations are possible, if only one component exists in each stream?

a) 1

b) 2

c) 3

d) 4

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12. How many independent equations are possible, if two components are involved in each of streams?

a) 1

b) 2

c) 3

d) 4

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13. 1 has pure A and 2 has pure B and 3, 4 and 5 has mixture of A and B, how many independent equations are possible?

a) 1

b) 2

c) 3

d) 4

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14. How many independent equations are possible if each stream contains mixture of A, B and C?

a) 1

b) 3

c) 6

d) 8

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15. How many independent equation are possible if 1 has pure A, 2 has mixture of B and C, 3 has mixture of A, B and C, 4 has pure C, 5 has mixture of A and B.

a) 1

b) 3

c) 6

d) 9

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## Set 5

1. What is the pressure if 10 N of force is acting normally on 5 m^{2} surface area?

a) 2 Pa

b) 4 Pa

c) 8 Pa

d) 10 Pa

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2. What is the pressure if 10 N of force acts at 60 degrees from the normal of a 5 m^{2} surface?

a) 0.5 Pa

b) 1 Pa

c) 2 Pa

d) 4 Pa

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^{o}= 10*0.5 = 5 N, => Pressure = 5/5 = 1 Pa.

3. What is the pressure if 10 N of force acts at 30 degrees from the surface of area 5 m^{2}?

a) 1 Pa

b) 2 Pa

c) 5 Pa

d) 10 Pa

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^{o}= 10*0.5 = 5 N, => Pressure = 5/5 = 1 Pa.

4. What is the pressure of 1 mole of an ideal gas at 27^{o}C occupying 1 Liter of volume?

a) 12.31 atm

b) 24.63 atm

c) 36.95 atm

d) 48.94 atm

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5. An open tank 10 m deep is completely filled with a liquid of density 5 kg/m^{3}, what is the pressure difference at the top and bottom?

a) 100 N/m^{2}

b) 250 N/m^{2}

c) 500 N/m^{2}

d) 1000 N/m^{2}

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^{2}.

6. 10 mm of water (density = 1000 kg/m^{3}) and 5 mm of a liquid has the same pressure drop, what is the density of liquid?

a) 500 kg/m^{3}

b) 1000 kg/m^{3}

c) 1500 kg/m^{3}

d) 2000 kg/m^{3}

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_{1}h

_{1}= d

_{2}h

_{2}, => 10*1000 = 5*d

_{2}, => d

^{3}.

7. Which of the following is not a pressure measuring device?

a) Manometer

b) Barometer

c) Galvanometer

d) None of the mentioned

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8. Bernoulli’s Equation is the conservation of?

a) Energy

b) Momentum

c) Pressure

d) Mass

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9. What is the pressure difference of the ends of a U-tube manometer filled with liquid (density = 10 kg/m^{3}) the difference in the height of the liquid in the tubes is 5 cm?

a) 5 N/m^{2}

b) 10 N/m^{2}

c) 15 N/m^{2}

d) 20 N/m^{2}

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^{2}.

10. A hydraulic lever has input surface area 2 m^{2}, and output surface area 10 m^{2}, if the input force is 5 N, then what is the output force?

a) 1 N

b) 2 N

c) 5 N

d) 10 N

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_{1}A

_{1}= F

_{2}A

_{2}, => 5*2 = F

_{2}*10, => F

_{2}= 1 N.

11. A Closed U-tube manometer has a gas at one end and vacuum at other end, if the height difference of the liquid (density = 10 kg/m^{3}) in the manometer in 5 cm, what is the pressure of the gas?

a) 10 N/m^{2}

b) 5 N/m^{2}

c) 2.5 N/m^{2}

d) 1 N/m^{2}

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^{2}.

12. Archimedes’ principle describes which of the following quantities?

a) Pressure

b) Buoyancy

c) Velocity

d) Mass

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13. An object is dipped in water, if the weight of the object measured by spring balance is 10 g and buoyancy force acting on the object is 0.1 N then what is the actual mass of the object?

a) 10 g

b) 20 g

c) 30 g

d) 40 g

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^{–}3)*10 + 0.1 = 0.2 N, => actual mass of the object = 0.2/10 = 0.02 kg = 20 g.

14. An open end manometer is filled with a gas on one end and other end is open to atmosphere with height difference of liquid (density = 10000 Kg/m^{3}) 10 cm, what is the pressure of gas?

a) 1 atm

b) 1.1 atm

c) 1.2 atm

d) 1.3 atm

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15. A closed end manometer is filled with a gas on one end and other end is close with vacuum, height difference of liquid (density = 10000 Kg/m^{3}) 25 cm, what is the pressure of gas?

a) 0.1 atm

b) 0.24 atm

c) 0.36 atm

d) 0.9 atm