Cosmic rays
Ultraviolet rays
Infrared rays
none of these
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
On a clear night, we can see nearly _ stars with naked eyes
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that
Ondometer is a -
One can distinguish a telescope from a microscope by observing
One carat of diamond is equal to
One fathom is equal to how many meters ?
One kilometer is equal to how many miles?
One micron is equal to.
One nanometer is equal to
