Physics · 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 botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis site of photosynthesis

Which of the following is mainly used to the light intensity and optical properties in a UV spectrophotometer?

  1. Photometer

  2. Monochromator

  3. Diode

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

UV spectroscopy is a type of absorption spectroscopy in which light of ultra-violet region is absorbed by the molecule resulting in the excitation of the electrons from the ground state to higher energy state. A photometer is a part of a UV spectrophotometer and measures light intensity or the optical properties of solutions. Thus the correct answer is option A.

Multiple choice botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis site of photosynthesis

Which of the following can be measured by photometer?

  1. Illuminance

  2. Irradiance

  3. Fluorescence

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A photometer is an instrument that measures the strength of electromagnetic radiations in the ultraviolet, visible and the infrared spectrum. Most of the photometers convert light into electric current with the help of a photoresistor. photodiode or a photomultiplier. 

So, the correct answer is 'All of the above'

Multiple choice spectrophotometer, colorimeter and biosensor biochemical techniques bio-chemistry

Which of the following statement can be related to colorimeter?

  1. It is a light sensitive device

  2. It is used to measure the absorbance

  3. It is used to measure the transmittance

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A colorimeter is a light-sensitive device user to measure the transmittance and absorbance of light passing through a liquid sample. It measures the intensity or concentration of the color that develops after adding a specific reagent to a solution. The working of colorimeter is based on Beer-Lambert law which states that absorption of light transmitted through the medium is directly proportional to the medium concentration.

So,  the correct answer is 'All of the above'

Multiple choice spectrophotometer, colorimeter and biosensor biochemical techniques bio-chemistry

Name the equipment used in measuring thermal behaviour of water _______________.

  1. SEM

  2. Differential scanning calorimeter

  3. Real time PCR

  4. MALDI-TOF
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Differential scanning calorimetry (DSC) is the standard analytical technique used to measure the thermal behavior, such as heat capacity and phase transitions, of materials including water.

Multiple choice zoology biotechnology: general introduction application of biotechnology miscellaneous applications of biotechnology application of biology in therapy and vaccine

The type of bio transducer used in the biosensors are ___________.

  1. Electrochemical biosensors

  2. Piezoelectric biosensors

  3. Pyroelectric biosensors

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The type of transducer used in the sensors are 


D) All of the above

i.e electrochemical, piezoelectric, pyroelectric, optical, amperometric biosensors.

Multiple choice zoology biotechnology: general introduction application of biotechnology miscellaneous applications of biotechnology application of biology in therapy and vaccine

Which of the following is considered as a physical component of biosensor?

  1. Analyte

  2. Amplifier

  3. Transducer

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A biosensor typically consists of a biological recognition element and a physical transducer that converts the biological signal into an electrical one. An amplifier is often used to boost this signal, making both components essential physical parts of the system.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

Complete the following sentence.

The stem of a hydrometer is made narrow because it _______its sensitivity.

  1. $increases$
  2. $decreases$
  3. $independent$
  4. $can't say$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrometer is an instrument used for determining the density of a liquid. It usually consists of a glass float with a long thin stem which is graduated. The glass float is a large hollow bulb which increases the buoyancy so that the hydrometer floats. The narrow stem increases the sensitivity of the hydrometer. The bottom of the hydrometer is made heavier by loading it with lead shots so that it floats vertically.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

A hydrometer is used to measure , which of  the following quantity of a liquid ?

  1. Mass

  2. Volume

  3. Relative density

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

A hydrometer is an instrument used to measure the relative density (or specific gravity) of liquids that is, the ratio of the density of the liquid to the density of water.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

Which is the best instrument for testing the state of charge of car battery ?

  1. Voltmeter

  2. Ammeter

  3. Voltameter

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

A hydrometer is used to test the state of charge of a battery cell. This is performed by measuring the density of the electrolyte, which is accomplished by measuring the specific gravity of the electrolyte. The greater the concentration of sulfuric acid, the more dense the electrolyte becomes.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

The narrow stem in a hydrometer

  1. increases its sensitivity.

  2. increases upthrust on it

  3. raises its centre of gravity

  4. increases its size
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The narrow stem in a hydrometer increases its sensitivity.
The pressure increase with depth, so the lower part is made heavy to withstand high pressure.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

Give reasons as to why the lower end of a hydrometer is filled with mercury or lead.

  1. to lower its CG point

  2. to increase the height of its CG point

  3. to rotate in water

  4. to jump in water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The lower end of a hydrometer is filled with mercury or lead in order to make it heavy so that it remains upright