This set of Introduction to Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Pressure”.

1. What is the pressure if 10 N of force is acting normally on 5 m2 surface area?

a) 2 Pa

b) 4 Pa

c) 8 Pa

d) 10 Pa

View answer

Explanation: Pressure = 10/5 = 2Pa.

2. What is the pressure if 10 N of force acts at 60 degrees from the normal of a 5 m2 surface?

a) 0.5 Pa

b) 1 Pa

c) 2 Pa

d) 4 Pa

View answer

Explanation: Normal component of the force = 10cos60o = 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 m2?

a) 1 Pa

b) 2 Pa

c) 5 Pa

d) 10 Pa

View answer

Explanation: Normal component of the force = 10sin30o = 10*0.5 = 5 N, => Pressure = 5/5 = 1 Pa.

4. What is the pressure of 1 mole of an ideal gas at 27oC occupying 1 Liter of volume?

a) 12.31 atm

b) 24.63 atm

c) 36.95 atm

d) 48.94 atm

View answer

Explanation: For ideal gas PV = nRT, => P = 1*0.0821*300/1 = 24.63 atm.

5. An open tank 10 m deep is completely filled with a liquid of density 5 kg/m3, what is the pressure difference at the top and bottom?

a) 100 N/m2

b) 250 N/m2

c) 500 N/m2

d) 1000 N/m2

View answer

Explanation: Pressure difference = dgh = 5*10*10 = 500 N/m2.

6. 10 mm of water (density = 1000 kg/m3) and 5 mm of a liquid has the same pressure drop, what is the density of liquid?

a) 500 kg/m3

b) 1000 kg/m3

c) 1500 kg/m3

d) 2000 kg/m3

View answer

Explanation: pressure of water = pressure of liquid, => d1h1 = d2h2, => 10*1000 = 5*d2, => d2 = 2000 kg/m3.

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

a) Manometer

b) Barometer

c) Galvanometer

d) None of the mentioned

View answer

Explanation: Galvanometer is used to measure current.

8. Bernoulli’s Equation is the conservation of?

a) Energy

b) Momentum

c) Pressure

d) Mass

View answer

Explanation: Bernoulli’s equation is modified form of conservation of energy equation.

9. What is the pressure difference of the ends of a U-tube manometer filled with liquid (density = 10 kg/m3) the difference in the height of the liquid in the tubes is 5 cm?

a) 5 N/m2

b) 10 N/m2

c) 15 N/m2

d) 20 N/m2

View answer

Explanation: Pressure difference = dgh = 10*10*0.05 = 5 N/m2.

10. A hydraulic lever has input surface area 2 m2, and output surface area 10 m2, 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

View answer

Explanation: Hydraulic lever works on the Pascal’s principle, => F1A1 = F2A2, => 5*2 = F2*10, => F2 = 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/m3) in the manometer in 5 cm, what is the pressure of the gas?

a) 10 N/m2

b) 5 N/m2

c) 2.5 N/m2

d) 1 N/m2

View answer

Explanation: Pressure of the gas = dgh = 10*10*0.05 = 5 N/m2.

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

a) Pressure

b) Buoyancy

c) Velocity

d) Mass

View answer

Explanation: Archimedes’ principle states that buoyant force on a body is equal to the weight of the body.

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

View answer

Explanation: Weight of the object = (10*10-3)*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/m3) 10 cm, what is the pressure of gas?

a) 1 atm

b) 1.1 atm

c) 1.2 atm

d) 1.3 atm

View answer

Explanation: Pressure = 1 + 10000*10*0.1/101325 = 1.1 atm.

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/m3) 25 cm, what is the pressure of gas?

a) 0.1 atm

b) 0.24 atm

c) 0.36 atm

d) 0.9 atm

View answer

Explanation: Pressure = 10000*10*0.25/101325 = 0.24 atm.

**Sanfoundry Global Education & Learning Series – Introduction to Chemical Engineering.**

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