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Online General Science Quiz Set No - 31

General Science questions have been taken from previous years question papers of different competitive examinations such SSC CGL, SSC CHSL, CDS, NDA, Bank, State PSC, Railways, MAT, CAT, etc.

301) The pH of fresh groundwater slightly decreases upon exposure to air because?
A) the dissolved carbon dioxide of the groundwater escapes into air
B) the dissolved oxygen of the groundwater escapes into air
C) oxygen from air is dissolved in the water
D) carbon dioxide from air is dissolved in the water

302) The phenomenon which causes mirage is
A) Interference
B) Diffraction
C) Polarisation
D) Total Internal Reflection

303) The planets revolve round the sun due to
A) Frictional force
B) Centrifugal force
C) Inertial force
D) Centripetal force

304) The plants which grow well, only in light are knowns as
A) Sciophilous
B) Xerophytes
C) Heliophytes
D) Epiphytes

305) The polymer obtained by the condensation of hexamethylene diamine and adipic acid is
A) Terylene
B) Tolleri's
C) Bakelite
D) Nylon

306) The presence of which of the following salts in water causes corrosion in steam boilers ?
A) Sodium Chloride
B) Magnesium Chloride
C) Calcium bicarbonate
D) Potassium bicarbonate

307) The product used for manufacturing of Industrial alcohol is?
A) Molasses
B) Khandasari
C) Paper-pulp
D) Bagasse

308) The property of a substance to absorb moisture from the air on exposure is called:
A) Osmosis
B) Desiccation
C) Efflorescence
D) Deliquescene

309) The purest form of iron is
A) Cast iron
B) Pig iron
C) Steel
D) Wrought iron

310) The purest form of iron is:
A) Steel
B) Pig iron
C) Cast iron
D) Wrought iron