dispersion
interference
diffraction
polarization
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Materials for rain-proof coats and tents owe their water-proof properties to
RADAR is used for
Sound of frequency below 20 Hz is called
On a clean glass plate a drop of water spread to form a thin layer whereas a drop of mercury remains almost spherical because
Brass gets discoloured in air because of the presence of which of the following gases in air ?
Which is a non metal that remains liquid at room temperature ?
Chlorophyll is a naturally occurring chelate compound in which central metal is
Which of the following is used in pencils ?
Which of the following metals forms an amalgam with other metals ?
