Civil Engineering (CE) Exam  >  Civil Engineering (CE) Tests  >  Test: Barometer & Piezometer - Civil Engineering (CE) MCQ

Test: Barometer & Piezometer - Civil Engineering (CE) MCQ


Test Description

10 Questions MCQ Test - Test: Barometer & Piezometer

Test: Barometer & Piezometer for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Test: Barometer & Piezometer questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Barometer & Piezometer MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Barometer & Piezometer below.
Solutions of Test: Barometer & Piezometer questions in English are available as part of our course for Civil Engineering (CE) & Test: Barometer & Piezometer solutions in Hindi for Civil Engineering (CE) course. Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free. Attempt Test: Barometer & Piezometer | 10 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study for Civil Engineering (CE) Exam | Download free PDF with solutions
Test: Barometer & Piezometer - Question 1

Mercury is used in barometer because of its ______?

Detailed Solution for Test: Barometer & Piezometer - Question 1

Barometer: Long ago in the mid-17th century, an Italian scientist by the name of Evangelista Torricelli decided to create a device to measure atmospheric pressure. This device is called the barometer.

  • The function of a barometer is to let you know whether or not atmospheric pressure is rising or falling. 

Mercury: It is the only common metal that is liquid at ordinary temperatures.

  • Mercury is sometimes called quicksilver. It is a heavy, silvery-white liquid metal. It is a rather poor conductor of heat if compared with other metals but it is a fair conductor of electricity,
  • It alloys easily with many metals, such as gold, silver, and tin. These alloys are called amalgams
  • Mercury has a melting point of -38.9°C, a boiling point of 356.7°C. and is the only metal to remain in liquid form at room temperature.
  • Droplets of liquid mercury are shiny and silver-white with high surface tension.

Mercury is used in Barometer for the following reasons:

  • Mercury is denser. Its relative density is 13.534 times that of water. So to measure the atmospheric pressure, which is 760 mm of mercury you need a barometer, with mercury of length slightly more than 0.76 meters, say one meter to cover the special cases of some higher times the length of mercury barometer, which may be more than 11 meters in length.
  • Further mercury, being metal has a shining quality which highlights it's reading clear.
  • Also, mercury, having comparatively lower specific heat and a good conductor of heat (low melting point), could come to the same temperature of the atmosphere more quickly.
  • Hence option 4 is the correct option.
Test: Barometer & Piezometer - Question 2

The barometric pressure at the base of a mountain is 750 mm Hg and at the top 600 mm Hg. if the average air density is 1 kg/m3, the height of the mountain (in m) is approximately

Detailed Solution for Test: Barometer & Piezometer - Question 2

At base PB = 750 mm of Hg
At top, PA = 600 mm of Hg
∴ Pressure difference = 150 mm of Hg = 150 × 10-3 × 13.6 × 103 × 9.81
(ΔP) = hρg

= 2040m
⇒ Height of mountain = 2040 m

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Barometer & Piezometer - Question 3

Match List I with List ll and select the correct answer:

Detailed Solution for Test: Barometer & Piezometer - Question 3
  • A hydrometer is used to find the specific gravity or relative density of liquids.
  • A barometer is used to measure local atmospheric pressure.
  • U - tube manometer is used to find pressure difference across two points.
  • Bourdon gauge is used to measure gauge pressure.
Test: Barometer & Piezometer - Question 4

Which of the following pressure gauge is generally used for the calibration of other pressure measuring gauges

Detailed Solution for Test: Barometer & Piezometer - Question 4

A pressure gauge is a mechanical instrument designed to measure the internal pressure and vacuum of a system. Types of pressure gauge:

  • Dead weight pressure gauge: A dead weight pressure gauge tester apparatus applies pressure to a fluid using known traceable weights to check the accuracy of pressure gauge readings. A dead weight tester (DWT) is a calibration standard method that involves placing a load on a piston-cylinder and applying pressure beneath the piston to achieve equilibrium. In other words, a deadweight pressure gauge is used for calibration of the other pressure measuring gauges.
  • Bourdon tube pressure gauge: This is used for the measurement of relative pressures from 0.6 - 7,000 bar. They are classified as mechanical pressure measuring instruments and thus operate without any electrical power. The Bourdon pressure gauge uses the principle that a flattened tube tends to straighten or regain its circular form in cross-section when pressurized.
  • Diaphragm pressure gauge: It is a device that uses the deflection of a flexible membrane that separates regions of different pressure. The amount of deflection is repeatable for known pressure so the pressure can be determined by using calibration. The deformation of a thin diaphragm is dependent on the difference in pressure between its two faces. The reference face can be open to the atmosphere to measure gauge pressure, open to the second port to measure differential pressure and or can be sealed against a vacuum or other fixed reference pressure to measure absolute pressure.
  • Manometer gauge: 
  • It is the device used for the difference of pressure between two points in a pipe or two different pipes. The most common type of differential manometers are the U-tube differential manometer and the Inverted U-tube differential manometer.
Test: Barometer & Piezometer - Question 5

Peizometer measures only:

Detailed Solution for Test: Barometer & Piezometer - Question 5

  • Piezometer is the simplest form of manometer used for measuring gauge pressure
  • One end of this manometer is connected to the point where the pressure is to be measured and the other end is open to the atmosphere
  • As one end is open to atmosphere so it can’t be used for measuring the gas pressure
  • Gas pressure cannot be measured by means of piezometers because a gas forms no free atmosphere surface and it can’t be used when large pressures in the lighter liquid are to be measured
Test: Barometer & Piezometer - Question 6

If one were to use a piezometer to measure fluid pressure, which of the following disadvantages are they subject to?

Detailed Solution for Test: Barometer & Piezometer - Question 6

Concept:

  • Pressure: The force per unit area is called pressure. It is denoted by P.
  • Piezometer: A device that is used to measure liquid pressure in a system by measuring the height to which a column of the liquid rises against gravity or a device that measures the pressure (more precisely, the piezometric head) of groundwater at a specific point is called piezometer.

Limitations of Piezometer

  1. Piezometer cannot be used to measure the very high pressure of a liquid, because in that case a long glass tube will be required. A long glass tube is inconvenient to be used.
    • Mathematically, we know
    • Pressure : p = ρgh
    • or p ∝ h
    • Thus, at the same liquid, pressure head: h increases with an increase in pressure; p.
  2. It cannot be used to measure the gauge pressure of a gas i.e. leakage of gas through a piezometer.
  3. It cannot measure the vacuum pressure. Instead of a column of liquid going up in the tube, the atmospheric air will enter into the pipe through the glass tube. Hence, it can neither measure the high pressure nor the vacuum pressure of a liquid.
Test: Barometer & Piezometer - Question 7

Piezometers are used to measure ______. 

Detailed Solution for Test: Barometer & Piezometer - Question 7

  • Piezometer is the simplest form of manometer used for measuring gauge pressure
  • One end of this manometer is connected to the point where the pressure is to be measured and the other end is open to the atmosphere
  • As one end is open to atmosphere so it can’t be used for measuring the gas pressure
  • Gas pressure cannot be measured by means of piezometers because a gas forms no free atmosphere surface and it can’t be used when large pressures in the lighter liquid are to be measured
Test: Barometer & Piezometer - Question 8

In the given figure pressure p, in kPa, is

Detailed Solution for Test: Barometer & Piezometer - Question 8

Concept:
Applying pressure equation
P + (ρwgh) - (ρmgh) = 0 
Calculation:
Given:

ρw = 1000 kg/m3, ρm = 13.6 × 103 kg/m3, h = 30 cm = 0.3 m 
⇒ P + 0.30 × 9810 – 0.30 × 13.6 × 9810 = 0
⇒ P = 3.78 m of water
P= 3.78 × 10 × 1000 = 37.8 kPa

Test: Barometer & Piezometer - Question 9

When can a piezometer be not used for pressure measurement in pipes.

Detailed Solution for Test: Barometer & Piezometer - Question 9

  • Piezometer is the simplest form of manometer used for measuring gauge pressure
  • One end of this manometer is connected to the point where the pressure is to be measured and the other end is open to the atmosphere
  • As one end is open to the atmosphere so it can’t be used for measuring the gas pressure
  • Gas pressure cannot be measured by means of piezometers because a gas forms no free atmosphere surface and it can’t be used when large pressures in the lighter liquid are to be measured
Test: Barometer & Piezometer - Question 10

Which of the following devices is NOT used to measure flow rate of velocity of fluid?

Detailed Solution for Test: Barometer & Piezometer - Question 10

Velocity of a fluid flowing through the pipe is measured by

  • Current and turbine meter
  • Wire anemometer
  • Pitot tube

Piezometer: 

  • A device that is used to measure liquid pressure in a system by measuring the height to which a column of the liquid rises against gravity or a device that measures the pressure (more precisely, the piezometric head) of groundwater at a specific point is called piezometer.

  • One end of the piezometer is connected to the point where the pressure is to be measured and the other end is open to the atmosphere.
Information about Test: Barometer & Piezometer Page
In this test you can find the Exam questions for Test: Barometer & Piezometer solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Barometer & Piezometer, EduRev gives you an ample number of Online tests for practice

Top Courses for Civil Engineering (CE)

Download as PDF

Top Courses for Civil Engineering (CE)