Related Questions

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
A CO
B SO2
C NOx
D CFC (chloro fluoro carbons)
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
A Sedimentation tank
B Circular clarifier
C Mechanical flocculation
D Chemical coagulation
Conditioners like finely divided peat are added to the fertiliser to
A Counteract burning
B Avoid caking & hardening
C Produce bulk
D Increase its solubility
In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is
A More
B Less
C Same
D Unpredictable; depends on the particular reaction
The process by which fine solids is removed from liquids is termed as
A Decantation
B Flocculation
C Sedimentation
D Classification
The stone masonry of finely dressed stones laid in cement or lime, is
A Random rubble masonry
B Coursed rubble masonry
C Dry rubble masonry
D Ashlar masonry
An arch constructed with finely dressed stones, is known
A Ashlar arch
B Rubble arch
C Gauged arch
D Axed arch
Dermatologists tell us (P) that the skin (Q) is finely laminated coating (R) whose layered nature (S) has inspired comparisons with onions
A PQRS
B PRQS
C PRSQ
D PSRQ
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?
A Smog & ozone
B Hydrogen fluoride & nitrogen oxides
C Sulphur dioxide & spray of weed killers
D Carbon monoxide
If n is an integer such that when n is divided by 2 , the remainder is 1, when n is divided by 3, the remainder is 2, and when n is divided by 4, the remainder is 3. what is the least possible value of n?
A 23
B 25
C 24
D 28

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