Q.1
Persons working in cement plants and lime stone quarries are prone to disease like
Q.2
Hard water and soft water can be distinguished by using
Q.3
Which method will be employed to test the hardness of water?
Q.4
Which one of the following has a maximum tendency to form M3 ion ?
Q.5
A matured mammalian cell without nucleus is
Q.6
Silk fibre chemically is :
Q.7
How many electrons are there in a Hydrogen atom?
Q.8
The third shell of an atom can have a maximum of ______ electrons.
Q.9
Rutherford’s scattering experiment proved the presence of
Q.10
Number of neutrons in an atom of hydrogen is
Q.11
Which gas does not form the part of atmosphere ?
Q.12
Which one of the following statement is correct ?
Ozone is found in the earth's atmosphere mostly between
Q.13
Which one is the lightest element in the periodic table
Q.14
Which one of the following is most electronegative?
Q.15
The source of energy that causes the least global warming is
Q.16
Which of the following fuels causes minimum environmental pollution?
Q.17
Global warming may result in
Q.18
Depletion of ozone layer causes
Q.19
Which gas emitted by power stations causes acid rain?
Q.20
The purest form of water is
Q.21
Which of the following metals can displace copper from copper sulphate solution ?
Q.22
Who developed the model of atomic structure ?
Q.23
Nucleus of an atom consists of.
Q.24
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?
Q.25
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is
Q.26
Which one of the following is not a ‘green house gas’ ?
Q.27
Periodic table contains how many groups
Q.28
Biofertilizers convert nitrogen to ________ .
Q.29
Oxygen which is vital for life is a product of photosynthesis and comes from
Q.30
Nitrification is the biological process of converting
Q.31
Which among the following is a covalent compound ?
Q.32
The alkaloid naturally found in coffee, cocoa and cola nut is
Q.33
Which acid is used in Lead storage battery?
Q.34
Which of the following is not a nucleon?
Q.35
Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
Q.36
Which of the process is known as nitrification?
Q.37
The natural resource, known as black gold is
Q.38
The substance most commonly used as a food preservative is
Q.39
Green house effect is accelerated by
Q.40
For generation of biogas, the materials commonly used are
Q.41
Total number of elements in the Periodic table
Q.42
Which of the following is a renewable source of energy ?
Q.43
The elements in the modern Periodic table are arranged according to their
Q.44
Which one of the following is a greenhouse gas ?
Q.45
Acid rain is caused by the pollution of environment by
Q.46
Besides CO2, the other green house gas is
Q.47
Formic acid is produced by
Q.48
The acid used in lead storage cells is
Q.49
Nitrogen fixation is a process of
Q.50
Greenhouse effect is caused by
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