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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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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).