Johann Wolfgang Döbereiner
John Newlands
Dmitri lvanovich Mendeleev
Henry Moseley
Threshold limit value of copper in the atmospheric air is
Through which light cannot pass?
Through which one among the following materials does sound travel slowest?
Time period of a simple pendulum is 1.5 sec. If the length of the pendulum is increased by 4 times then what is the new time period.
To convert Ac to DC
To convert temperature from Celcius to Kelvin scale, you must _ the given temperature.
To hear a clear echo, the minimum distance should be
To increase the magnifying power of telescope, we should increase
To measure the speed of an approaching car a police officer shines
To open a door easily, the handle should be fixed