Physics Questions Answers

  • 57. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?

    1. Newton first law
    2. Newton second law
    3. Newton third law
    4. Principle of conservation of linear momentum
    Answer :

    Option D

  • 58. Light year is a unit of

    1. Time
    2. Light
    3. Distance
    4. Intensity of light
    Answer :

    Option C

  • 59. The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.

    1. True
    2. False
    Answer :

    Option B

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

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

  • 61. What is unit of Viscosity ?

    1. coulomb
    2. newton second per square meter
    3. watt per meter per degree celcius
    4. joule per kilogram per Kelvin
    Answer :

    Option B

    Explanation:

    coulomb is unit of Electric Charge,

    watt per meter per degree celcius is unit of Thermal Conductivity,
    joule per kilogram per Kelvin is unit of Specific Heat capacity.

  • 62. Which of following in not a property of cathode ray.

    1. Cathode rays are invisible and travel in a straight line.
    2. These rays can ionise gases.
    3. These rays can penetrate through thin metal foils.
    4. These rays make materials cool on which they fall.
    Answer :

    Option D

    Explanation:

    These rays heat the materials on which they fall.

  • 63. All planets move around the sun in elliptical orbits, with the sun being at rest at one focus of the orbit.

    1. True
    2. False
    Answer :

    Option A

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