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90074291. Oxygen which is vital for life is a product of photosynthesis and comes from
A
carbonates from soilB
carbon dioxideC
waterD
oxides of mineral elementsCorrect Answer: C. water
90115292. The gas used for artificial fruit ripening of green fruit is —
A
EthyleneB
AcetyleneC
EthaneD
MethaneCorrect Answer: A. Ethylene
90029293. Cokking gas is a mixture of
A
methane and ethyleneB
carbon dioxide and oxygenC
butane and propaneD
carbon monoxide and carbon dioxideCorrect Answer: C. butane and propane
90047294. German silver is an alloy of
A
copper, nickel and silverB
silver, copper and aluminiumC
zinc, copper and nickelD
zinc, silver and copperCorrect Answer: C. zinc, copper and nickel
90043295. Fermentation of milk to curd is due to
A
MycobacteriumB
StaphylocoCcusC
LactobacillusD
YeastsCorrect Answer: C. Lactobacillus
90176296. Which of the following imparts a deep blue color to glass?
A
Cobalt oxideB
Cupric oxideC
Ferrous oxideD
Nickel oxideCorrect Answer: D. Nickel oxide
90170297. Which metal is extracted from sea water?
A
PotassiumB
MagnesiumC
AluminiumD
BerylliumCorrect Answer: B. Magnesium
90054298. Helium gas is used in gas balloons instead of hydrogen gas because it is
A
lighter than hydrogenB
more abundant than hydrogenC
non-combustibleD
more stableCorrect Answer: C. non-combustible
90173299. Which of the following elements is non-radioactive?
A
UraniumB
ThoriumC
PlutoniumD
ZirconiumCorrect Answer: D. Zirconium
90145300. The tip of the match-stick contains
A
phosphorus pentoxideB
white phosphorusC
red phosphorusD
phosphorus trichlorideCorrect Answer: C. red phosphorus
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