The pH of rainwater is:
a) 4.5-4.8
b) 5.4-5.8
c) 5.6-6.0
d) 7.0
The existence of an element in more than one crystalline form is called.
a) Syntropy
b) Allotropy
c) Allelotropy
d) Allelopathy
At sea level, the mean density of the air molecule is maximum and the atmospheric pressure is:
a) Maximum
b) Minimum
c) Not change
d) Minute change observed
One BTU is equal to _______ joules.
a) 1035
b) 1045
c) 1055
d) 1065
The visible region comes under the spectral series of Hydrogen is called as:
a) Lyman series
b) Balmer series
c) Panchen series
d) Brackett series
Which one of the following is the most abundant element in the universe?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Carbon
