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It is more difficult to walk on a sandy road than on a concrete road because
Of the following properties of a wave, the one that is independent of the other is its
Lux is the SI unit of
On a rainy day, small oil films on water show brilliant colours. This is due to
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 ?
