Physics Questions Answers

  • 1. Siphon will fail to work if

    1. both its limbs are of unequal length
    2. the temperature of the liquids in the two vessels are the same
    3. the level of the liquid in the two vessels are at the same height
    4. the densities of the liquid in the two vessels are equal
    Answer :

    Option C

  • 2. The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called

    1. Nuclear fusion
    2. Nuclear fission
    3. Nuclear reaction
    4. Fast breeding
    Answer :

    Option B

  • 3. Which is true

    1. In a static liquid at same horizontal level, pressure is more at centre
    2. In a static liquid at same horizontal level, pressure is less at centre.
    3. In a static liquid at same horizontal level, pressure is same at all points
    4. In a static liquid at same horizontal level, pressure is different at all points
    Answer :

    Option C

  • 4. Which law is also called law of inertia ?

    1. Newton first law
    2. Newton second law
    3. Newton third law
    4. All of above
    Answer :

    Option A

  • 5. Radiocarbon is produced in the atmosphere as a result of

    1. collision between fast neutrons and nitrogen nuclei present in the atmosphere
    2. action of ultraviolet light from the sun on atmospheric oxygen
    3. action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
    4. lightning discharge in atmosphere
    Answer :

    Option A

  • 6. What is newton third law of motion ?

    1. Every body maintains its initial state rest or motion unless no external force is applied.
    2. The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.
    3. To every action there is equal and opposite reaction.
    4. None of above.
    Answer :

    Option C

    Explanation:

    Newton First Law of Motion : Every body maintains its initial state rest or motion unless no external force is applied.

    Newton Second Law of Motion : The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.

  • 7. unit of Pressure is

    1. newton second
    2. pascal
    3. watt
    4. newton per meter
    Answer :

    Option B

    Explanation:

    newton second is unit of impulse,

    watt is unit of Power,

    newton per meter is unit of Surface Tension.

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