Science Quiz - Question & Answers Set

Science Quiz - Question & Answers Set - 8

Question 2 :
Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to
The formation of hydrochloric acid when chlorine is added to, water
The formation of hypochlorous acid when chlorine is added to water
The formation of nascent oxygen when chlorine is added to water
The formation of hydrogen when chlorine is added to water

Question 3 :
Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop a malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine ?
Malaria is caused by several species of Plasmodium
Man does not develop, immunity to malaria during natural infection
Vaccines can be developed only against bacteria
Man is only an intermediate host and not the definitive host

Question 6 :
Recently, LASIK (Laser Assisted In Situ Keratomileusis) procedure is being made popular for vision correction. Which one of the following statements in this context is not correct ?
LASIK procedure is used to correct refractive errors of the eye
It is a procedure that permanently changes the shapes of the cornea
It reduces a person's dependence on glasses or contact lenses
It is a procedure that can be done on the person of any age

Question 9 :
Which feature of some species of blue-green algae helps promote them as bio-fertilizers?
They convert- atmospheric methane into ammonia which the crop plants can absorb readily
They induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates
They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily
They induce the roots of the crop plants to absorb the soil nitrates in larger quantities

Question 10 :
Some species of plants are insectivorous. Why?
Their growth in shady and dark places does not allow them- to undertake sufficient photosynthesis and thus they depend on insects for nutrition.
They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition
They cannot synthesize certain vitamins themselves and depend on the insects digested by them
They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs

Question 11 :
Which one of the following reflects back more sunlight as compared to other three?
Sand desert
Paddy crop land
Land covered with fresh snow
Prairie land

Question 12 :
What is the principle by which a cooling system (Radiator) in a motor car works ?
Conduction only
Convection
Radiation only
Both conduction and radiation

Question 14 :
Which one of the following processes in the bodies of living organisms is a digestive process ?
Breakdown of proteins into amino acids
Breakdown of glucose into CO2 and H20
Conversion of glucose into glycogen
Conversion of amino acids into proteins