Physics ยท General Awareness

Physics Measuring Instruments

1,123 Questions

Physics measuring instruments are essential tools used to measure various physical quantities. This topic covers devices like hygrometers, oscilloscopes, and sphygmomanometers. It is a highly scoring section in general science and general awareness examinations.

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Physics Measuring Instruments Questions

Multiple choice

Which instrument is used to measure the pH of water?

  1. pH meter

  2. Conductivity meter

  3. Turbidimeter

  4. Flowmeter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A pH meter is an instrument used to measure the pH of a solution. It consists of a probe that is inserted into the solution and a meter that displays the pH value.

Multiple choice

Which instrument is used to measure the turbidity of water?

  1. Turbidimeter

  2. Secchi disk

  3. Flowmeter

  4. Current meter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A turbidimeter is an instrument used to measure the turbidity of water. It works by measuring the amount of light that is scattered by the suspended particles in the water.

Multiple choice

What is the principle of operation of a Secchi disk?

  1. Measuring the depth of water

  2. Measuring the transparency of water

  3. Measuring the turbidity of water

  4. Measuring the flow rate of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A Secchi disk is a simple instrument used to measure the transparency of water. It consists of a white disk that is lowered into the water until it disappears from view. The depth at which the disk disappears is a measure of the transparency of the water.

Multiple choice

Which instrument is used to measure the stage of a river?

  1. Staff gauge

  2. Water level recorder

  3. Flowmeter

  4. Current meter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A staff gauge is a simple instrument used to measure the stage of a river. It consists of a graduated scale that is attached to a post or structure in the river. The stage of the river is measured by reading the water level on the scale.

Multiple choice

Which instrument is used to measure the discharge of a river?

  1. Current meter

  2. Flowmeter

  3. Velocity rod

  4. Pitot tube
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A current meter is a device used to measure the velocity of flowing water. It consists of a propeller or impeller that rotates in proportion to the speed of the water. The discharge of a river can be calculated by measuring the velocity of the water and the cross-sectional area of the river.

Multiple choice

Which of the following is NOT a common type of oceanographic instrument?

  1. CTD (Conductivity, Temperature, Depth) profiler

  2. ADCP (Acoustic Doppler Current Profiler)

  3. ROV (Remotely Operated Vehicle)

  4. Spectrophotometer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Spectrophotometers are not typically used as oceanographic instruments, as they are primarily used for analyzing the chemical composition of substances in laboratory settings.

Multiple choice

Which of the following is NOT a type of astronomical detector?

  1. CCD detector

  2. CMOS detector

  3. Photomultiplier tube

  4. Radiometer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radiometers are used to measure the intensity of radio waves, while CCD, CMOS, and photomultiplier tubes are used to detect light.

Multiple choice

Which of the following instruments is used to measure the altitude of celestial objects?

  1. Sundial

  2. Astrolabe

  3. Quadrant

  4. Armillary sphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A quadrant is an instrument used to measure the altitude of celestial objects. It consists of a quarter-circle arc with a plumb line attached to the center.

Multiple choice

What is the name of the instrument used to measure the time of day?

  1. Sundial

  2. Astrolabe

  3. Quadrant

  4. Armillary sphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A sundial is an instrument used to measure the time of day. It consists of a pointer that casts a shadow on a marked surface.

Multiple choice

What was the name of the instrument that C. V. Raman used to study the Raman effect?

  1. Spectrometer

  2. Raman spectrometer

  3. Interferometer

  4. Polarimeter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

C. V. Raman used a Raman spectrometer to study the Raman effect.

Multiple choice

Which instrument is commonly used to measure horizontal angles in surveying?

  1. Theodolite

  2. Level

  3. Total station

  4. GPS receiver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A theodolite is a precision instrument used to measure horizontal and vertical angles. It is commonly used in surveying to establish control points and measure angles between points.

Multiple choice

Which diagnostic technique is commonly used to measure the electron density in a plasma?

  1. Interferometry

  2. Spectroscopy

  3. Langmuir Probe

  4. Magnetic Probe
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interferometry is a diagnostic technique that utilizes the interference of electromagnetic waves to determine the electron density in a plasma. By measuring the phase shift or intensity changes in the transmitted or reflected waves, the electron density can be inferred.

Multiple choice

What is the primary purpose of using a bolometer in plasma diagnostics?

  1. Measuring Plasma Potential

  2. Measuring Electron Density

  3. Measuring Ion Temperature

  4. Measuring Radiated Power
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A bolometer is a diagnostic tool used to measure the total radiated power emitted by a plasma. It is typically composed of a temperature-sensitive material that converts the incident radiation into a measurable electrical signal.

Multiple choice

Which diagnostic technique is commonly employed to measure the ion temperature in a plasma?

  1. Langmuir Probe

  2. Spectroscopy

  3. Magnetic Probe

  4. Doppler Spectroscopy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Doppler spectroscopy is a diagnostic technique that utilizes the Doppler shift in spectral lines to determine the ion temperature in a plasma. By measuring the shift in the wavelength or frequency of emitted or absorbed light, the ion velocity distribution and temperature can be inferred.

Multiple choice

Which diagnostic technique is commonly used to measure the electric field in a plasma?

  1. Langmuir Probe

  2. Spectroscopy

  3. Magnetic Probe

  4. Stark Spectroscopy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stark spectroscopy is a diagnostic technique that utilizes the Stark effect to measure the electric field in a plasma. The Stark effect refers to the splitting of spectral lines in the presence of an electric field. By analyzing the splitting of spectral lines, the electric field strength can be determined.