An earthquake of magnitude _________________ on Richter scale has thousand times more destructive energy than an earthquake of magnitude 4.
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When a bullet is fired from a gun, the gun moves in the opposite direction. This illustrates Newton's
The instrument that measures the ______________ is called an anemometer.
The phenomenon of change in direction of light when it passes from one medium to another is called
Which of the following is a Non-Luminous body?
A conductor having some appreciable resistance is called a
Insulators have resistivity of the order of
The radius of curvature of a concave mirror is 30 cm. Following Cartesian Sign Convention, its focal length is expressed as
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