Physics

    Physics
    An oil drop spreads over water because
    Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.
    Author: rikazzz Comment
    Everyday Science
    Mercury freezes at
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    Work and Energy
    The energy possessed by a body due to its motion is called its
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    Dynamics
    A force of 15 N moves a body with an acceleration of 3 ms−2. Its mass is
    Author: rikazzz Comment
    Physics
    Who is known as the ‘father of quantum theory’?
    Max Planck is known as the ‘father of quantum theory’.
    Author: rikazzz Comment
    Work and Energy
    By burning large amount of fuel, we get
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    Gravitation
    If a body of mass ‘m’ at an altitude ‘h’, then the distance of the body from the center of the Earth will become
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    Current Electricity
    Watt is equal to one
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    Physics
    The device which transfer the signal from low resistance region to high resistance region is
    A transistor transfers a signal from a low resistance to high resistance. It has two PN-junctions: one junction is forward biased and other junction is reverse biased having low resistance path and high resistance path respectively. The weak signal is introduced in the low resistance, circuit and output is taken from the high resistance circuit.
    Author: rikazzz Comment
    Current Electricity
    To pass the maximum current, the ideal galvanometer should have
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