Science Quiz - Question & Answers Set - 8

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Home Practice Tests Science Practice Tests Science Quiz - Question & Answers Set - 8

15 Questions

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Science Quiz - Question & Answers Set - 8

Question 1 :
Consider the following statements:

If there were no phenomenon of capillarity
- 1. it would be difficult to use a kerosene lamp
- 2. one would not be able to use a straw to consume a soft drink
- 3. the blotting paper would fail to function
- 4. the big trees that we see around would not have grown on the Earth
Which of the statements given above are correct?
A1, 2 and 3 only
B1, 3 and 4 only

C 2 and 4 only
D1, 2, 3 and 4

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

BThe formation of hypochlorous acid when chlorine is added to water
CThe formation of nascent oxygen when chlorine is added to water
DThe 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 ?
AMalaria is caused by several species of Plasmodium
BMan does not develop, immunity to malaria during natural infection

CVaccines can be developed only against bacteria
DMan is only an intermediate host and not the definitive host

Question 4 :
A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is:
Food crop - Rat -Snake - Hawk. In this food chain, the highest concentration of the pesticide would accumulate in which one of the following?
AFood crop
BRat
CSnake
DHawk

Question 5 :
Hydrogen fuel cell vehicles produce one of the following as "exhaust"
ANH₃
BCH₄
CH₂O

DH₂O₂

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 ?
ALASIK procedure is used to correct refractive errors of the eye
BIt is a procedure that permanently changes the shapes of the cornea
CIt reduces a person's dependence on glasses or contact lenses
DIt is a procedure that can be done on the person of any age

Question 7 :
Consider the following:
- 1. Oxides of Hydrogen
- 2. Oxides of Nitrogen
- 3. Oxides of Sulphur
Which of the above causes/cause acid rain ?
A1 and 2 only
B3 only
C2 and 3 only

D1, 2 and 3

Question 8 :
Which bacterial strain, developed from natural isolates by genetic manipulations, can be used for treating oil spills ?
AAgrobacterium
BClostridium
CNitrosomonas

DPseudomonas

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

DThey induce the roots of the crop plants to absorb the soil nitrates in larger quantities

Question 10 :
Some species of plants are insectivorous. Why?
ATheir growth in shady and dark places does not allow them- to undertake sufficient photosynthesis and thus they depend on insects for nutrition.
BThey are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition

CThey cannot synthesize certain vitamins themselves and depend on the insects digested by them
DThey 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?
ASand desert
BPaddy crop land
CLand covered with fresh snow

DPrairie land

Question 12 :
What is the principle by which a cooling system (Radiator) in a motor car works ?
AConduction only
BConvection

CRadiation only
DBoth conduction and radiation

Question 13 :
When you travel in certain parts of India, you will notice red soil. What is the main reason for this colour ?
AAbundance of magnesium
BAccumulated humus
CPresence of ferric-oxides

DAbundance of phosphates

Question 14 :
Which one of the following processes in the bodies of living organisms is a digestive process ?
ABreakdown of proteins into amino acids

B Breakdown of glucose into CO2 and H20
CConversion of glucose into glycogen
DConversion of amino acids into proteins

Question 15 :
From the point of view of evolution of living organisms, which one of the following is the correct sequence of evolution ?
AOtter -Tortoise - Shark
BShark - Tortoise - Otter

CTortoise - Shark - Otter
DShark - Otter - Tortoise

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