Measuring Instruments MCQ Quiz - Objective Question with Answer for Measuring Instruments - Download Free PDF

The correct answer is Altimeter.

• The altimeter is used to measure the height of an aircraft above a fixed level.

Key Points

• Altimeter:
  • An altimeter is a device that measures altitude at a location's distance above sea level.

Additional Information

• A barometer is used to measure atmospheric pressure.
• A fathometer is used to measure the depth of water.
• A wattmeter is an instrument for measuring the electric active power. 

The correct answer is a fathometer.

Key Points

• A fathometer is a device that is used to measure the depth of water in the ocean using the principle of reflection of sound or echo sounding.
• The device transmits sound waves through the water which on striking the bottom, return as the echo.
• This echo is received and analyzed by the hydrophone echo receiver to give the depth of water.
• The fathometer was patented on 22 July 1913 by Alexander Behm.

Additional Information

• A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
• Lactometer is an instrument used in measuring the volume of cream in a sample of milk, and the probable amount of water, if any, which has been added to it.
• A dynamometer is a device used for measuring the torque and brake power required to operate a driven machine. It has a device to measure the frictional resistance.

The correct answer is  Voltmeter.

Key Points

• A voltmeter is an instrument used to measure the potential difference.
• A voltmeter is used between two points in an electric circuit to measure the potential difference between those two points.
• Voltmeter was invented in 1819 by Hans Oersted.
• The symbol for the voltmeter is shown below:
• 

Additional Information

• The ammeter is the instrument used for measuring current in the electrical circuit.
• The galvanometer is the instrument that detects current in the electrical circuit.

The correct answer is Barometer.

Key Points

• The Barometer was invented by Italian Physicist Evangelista Toricelli in 1643.
• The Barometer measures atmospheric pressure in units of measurement called atmospheres or bars.
• There are two main types of Barometer:
  • Mercury Barometer
  • Aneroid Barometer.
• When there is a sudden fall in the barometer, it is an indication of a storm because the atmospheric pressure decreases all of a sudden during the storm.
• The Barometric Pressure is an indicator of the weight of the column of air ranges from a historic high of 32.01 inches to an all-time low of 25.9 inches.

Additional Information

Image of Barometer:

The correct answer is Altitude.

• Altitude:
  • An altimeter is an instrument used to measure altitudes in aircraft.
  • The measurement of altitude using altimeter is called altimetry.

Additional Information 

The correct answer is Seismograph.

Key Points

•  A seismograph is an instrument used to detect and record earthquakes.
• The first seismograph was developed in 1890.
  • It consists of a mass attached to a fixed base and during an earthquake, the base moves and the mass does not.
  • The motion of the base with respect to the mass is commonly transformed into an electrical voltage.
  • The electrical voltage is recorded on paper, magnetic tape, or another recording medium.
  • This record is proportional to the motion of the seismometer mass relative to the earth, but it can be mathematically converted to a record of the absolute motion of the ground. ​

Additional Information

• Earthquake: 
  • Earthquakes are caused by seismic waves that are generated due to a sudden movement in the earth's crust. 
  • Earthquakes may occur naturally or as a result of human activities.
  • Tectonic earthquakes are generated due to the sliding of rocks along a fault plane. 
  • Volcanic earthquakes are caused due to violent volcanic eruptions.

Important Points

The correct answer is Hydrophone.

Key Points

• The Hydrophone was invented by Reginald Fessenden in 1914.
• The word hydrophone is the combination of hydro and phone where hydro means water and phone means sound hence hydrophone is used for measuring sound under the water.

Additional Information

Image of Hydrophone:

The correct answer is Lactometer.

Important Points

• Lactometer is based on the principle of Archimedes.
• Archimedes’ principle, states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force, the magnitude of which is equal to the weight of the fluid displaced by the body.
• Instruments like types of hydrometers such as lactometer, saccharometer obey the Archimedes principle.

Key Points

• Lactometer is a small glass instrument that is used used to find out the amount of water in the milk​.
• It works on the principle of specific gravity of milk (Archimede’s Principle). 
• It measures the relative density of milk with respect to water. 
• If the specific gravity of a sample of milk is within the approved ranges, the milk is pure and If it is not, then there is some adulteration.

Additional Information

• Manometer - It is based on the principle of Hydrostatic Balance and is used for measuring the pressure.
• Auxanometer - For measuring the increase of growth in plants.
• Odometer - It registers the distance traveled by the vehicle
• Colorimeter - It is based on Beer-Lambert's law and is used to measure the absorbency of light waves.

• Saccharometer is a hydrometer used for determining the amount of sugar in a solution.

The correct answer is the periscope.

Key Points

• A periscope is used in submarines to view the surroundings outside the water while being inside the water.
• The mirrors are arranged inside a periscope in such a way that it allows the observer to see his surrounding while remaining submerged.

• Major Measuring Instrument is the following

The correct answer is option 4, i.e Altimeter.

Key Points

• An altimeter is an instrument used to measure altitudes in aircraft.
  • The altimeter was invented by Louis Paul Cailletet.
  • The measurement of altitude using altimeter is called altimetry.
• Actinometer is the instrument used to measure the heating power of radiation.
• Ceilometer is the instrument used to measure the aerosol concentration within the atmosphere.
• The accelerometer is the instrument used to measure the acceleration forces.

The correct answer is Pyrometer.

Key Points

The correct answer is Galvanometer.

Key Points

• The galvanometer is the instrument that is used to detect the presence of electricity in a circuit.
• Both the direction and magnitude of the current are depicted by the instrument.
• The SI unit of the galvanometer is Ampere per division.

Image of Galvanometer:

The correct answer is sonar.

Key Points

• Sonar is a technique that uses sound propagation to navigate, measure distances, and communicate with or detect objects on or under the surface of the water, such as other vessels.
• SONAR stands for "Sound Navigation and Ranging".
• Sound waves emitted by or reflected from the object are detected by sonar apparatus and analyzed for the information they contain.
• Scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the seafloor such as shipwrecks, and map the seafloor itself. There are two types of sonar—active and passive.

Additional Information

The correct answer is Altitude.

• Altitude:
  • An altimeter is an instrument used to measure altitudes in aircraft.
  • The measurement of altitude using altimeter is called altimetry.

Additional Information 

The correct answer is Barometer.

Key Points

• The Barometer was invented by Italian Physicist Evangelista Toricelli in 1643.
• The Barometer measures atmospheric pressure in units of measurement called atmospheres or bars.
• There are two main types of Barometer:
  • Mercury Barometer
  • Aneroid Barometer.
• When there is a sudden fall in the barometer, it is an indication of a storm because the atmospheric pressure decreases all of a sudden during the storm.
• The Barometric Pressure is an indicator of the weight of the column of air ranges from a historic high of 32.01 inches to an all-time low of 25.9 inches.

Additional Information

Image of Barometer: