78%
100%
1%
21%
The percentage of oxygen present in air is approximately
The PH value of a sample of multiple distilled water is
The phenomenon in which seeds germinate and seedlings grow while still attached to their mother plant before dropping down to establish themselves or be transported elsewhere, is most commonly found in which among the following plants?
The phenomenon of ejection of electrons from the metal surface when a light of suitable frequency falls on it is called-
The phenomenon which causes mirage is
The photoelectric effect is described as the ejection of electrons from the surface of a metal when -
The plastic material commonly used for making gear wheels is
The polymerisation of Which among the given is used in manufacturing of polythene in industry -
The presence of Cobalt in Vitamin B12 was established for the 1st time by
The presence of ozone in the stratosphere is responsible for
