Physics

    Physics
    A needle or a pin floats on the surface of water because of
    The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle’s weight.
    Author: rikazzz Comment
    Physics
    The working of a rocket is based on the principle of:
    Rocket works on the principle of conservation of linear momentum.
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    Physics
    Every hot object emits ________
    Every hot object emits infrared rays.
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    Physics
    The velocity of falling rain drops attains a terminal value because of
    The velocity of falling rain drops attains a terminal value because of viscous force exerted by air.
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    Physics
    Magnetic keepers are used to protect magnets from :
    Magnetic keepers are soft iron bars placed at either end of the pair of magnets. It is used to avoid self-demagnetisation of magnets.
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    Physics
    Unit of impedance is ________
    The unit of impedance, like that of resistance, is the ohm.
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    Physics
    Work done in a free expansion process is
    In free expansion there is no work done as there is no external external pressure. That’s certainly true, in fact free expansion is an irreversible process in which a gas expands into an insulated evacuated chamber, you can think of it like ann container with a piston and the gas is left to expand in vacuum.
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    Physics
    Who defined the law of gravitation ?
    Isaac Newton put forward the law in 1687 and used it to explain the observed motions of the planets and their moons, which had been reduced to mathematical form by Johannes Kepler early in the 17th century.
    Author: rikazzz Comment
    Everyday Science
    Which of the following is a secondary fuel?
    Gasoline is a secondary fuel Secondary fuels are fuels that are derived from some primary fuel or fuels through chemical or physical processes. These are fuels that are not found as a natural resource. Gasoline is the best example of a secondary fuel, as it must be made from oil through distillation processes.
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    Physics
    Negative acceleration is in the opposite direction of:
    When an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object also has a negative acceleration.
    Author: rikazzz Comment