Physics Questions Answers

• 8. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?

  1. Nephetometer
  2. Ohmmeter
  3. Ondometer
  4. Pyrometer

  Answer And Explanation

  Answer: Option A

  Explanation:

  Ohmmeter - is used to measure electrical resistance in ohms,
  
  Ondometer - is used to measure frequency of electromagnetic waves,
  
  Pyrometer - is used to measure very high temperature.

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• 9. Which instrument is used to determine the intensity of colours ?

  1. Cathetometer
  2. Chronometer
  3. Colorimeter
  4. Commutator

  Answer And Explanation

  Answer: Option C

  Explanation:

  Cathetometer - is used to determine heights,
  
  Chronometer - is used to longitude of a vessel at sea,
  
  Commutator - is used to convert AC to DC.
  

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• 10. Which instrument is used to measure changes in volume of substances ?

  1. Dyanamo
  2. Dilatometer
  3. Cyclotron
  4. Electroscope

  Answer And Explanation

  Answer: Option B

  Explanation:

  Dyanamo - is used to convert mechanical energy into electrical energy,
  
  Cyclotron - is a charged particle accelerator which can accelerate charged particles to high energies,
  
  Electroscope - is used to detect the presence of an electric charge.

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• 11. Which instrument is used to measure sound under water ?

  1. Hygrometer
  2. Hygroscope
  3. Hypsometer
  4. Hydrophone

  Answer And Explanation

  Answer: Option D

  Explanation:

  Hygrometer - is used to measure level of humidity,
  
  Hygroscope - shows the changes in atmospheric humidity,
  
  Hypsometer - is used to determine the boiling points of liquids.

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• 12. Which instrument is used to measure pressure of gases ?

  1. Manometer
  2. Machmeter
  3. Magnetometer
  4. Micrometer

  Answer And Explanation

  Answer: Option A

  Explanation:

  Machmeter - is used to determine the speed of an aircraft in terms of speed of sound,
  
  Magnetometer - is used to compare magnetic movements and fields,
  
  Micrometer - is used to convert sound waves into electrical vibrations.

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• 13. Which instrument is used to measure heat radiation ?

  1. Radar
  2. Salinometer
  3. Refractometer
  4. Radio micrometer

  Answer And Explanation

  Answer: Option D

  Explanation:

  Radar - is used to detect the direction and speed of an object by means of radiowaves,
  
  Salinometer - is used to determine salinity of solutions,
  
  Refractometer - is used to measure refractive indices.

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• 14. Which instrument is used to measure strength of direct current ?

  1. Stroboscope
  2. Streoscope
  3. Tangent Galvanometer
  4. Tachometer

  Answer And Explanation

  Answer: Option C

  Explanation:

  Stroboscope - is used to view rapidly moving objects,
  
  Streoscope - is used to view two dimensional pictures,
  
  Tachometer - is used to determine rotational speed of a shaft (used in aeroplanes and motor boats).

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