Physics Questions Answers

  • 36. Who discovered Diode Bulb ?

    1. Henry Becquerel
    2. Sir J.S. Fleming
    3. Lee De Forest
    4. Archemedes
    Answer :

    Option B

    Explanation:

    Sir J.S. Fleming discovered Diode Bulb in 1904,

    Lee De Forest discovered Triode Bulb in 1906,

    Archemedes discovered laws of floatation in 1827,

    Henry Becquerel discovered Radioactivity in 1896.

  • 37. Sudden fall in barometer is indication of

    1. Storm
    2. Rain
    3. Tide
    4. Clear weather
    Answer :

    Option A

  • 38. The angle of reflection is equal to the angle of incidence.

    1. True
    2. False
    Answer :

    Option A

  • 39. Atmospheric pressure is measured by

    1. Tonometer
    2. Pyrometer
    3. Barometer
    4. Thermometer
    Answer :

    Option C

  • 40. What is escape velocity ?

    1. Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
    2. Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
    3. Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
    4. Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
    Answer :

    Option C

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

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

  • 42. What is displacement ?

    1. Longest distance covered by a body in a random direction.
    2. Shortest distance covered by a body in a random direction.
    3. Shortest distance covered by a body in a definite direction.
    4. Longest distance covered by a body in a definite direction.
    Answer :

    Option C

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