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90018271. Bhopal gas tragedy is associated with leakage of
A
carbon dioxideB
nitrogen dioxideC
sulphur dioxideD
methyl isocyanateCorrect Answer: D. methyl isocyanate
90062272. Litmus is obtained from
A
a bacteriumB
a fungusC
an algaD
lichenCorrect Answer: D. lichen
90039273. Dry powder fire extinguishers contain
A
sandB
sand and sodium carbonateC
sand and potassium carbonateD
sand and sodium bicarbonateCorrect Answer: D. sand and sodium bicarbonate
90053274. Helium gas is filled in ballons because
A
its atomic number is 2B
it is lighter than airC
it is one of the constituents of waterD
it is a noble gasCorrect Answer: B. it is lighter than air
90021275. Brass is an alloy of
A
Lead and tinB
Zinc and copperC
Antimony, tin and leadD
Zinc, tin and copperCorrect Answer: B. Zinc and copper
90050276. Gold dissolves in
A
Hydrochloric acidB
Nitric acidC
Aqua-regiaD
Acetic acidCorrect Answer: C. Aqua-regia
90160277. What is the most commonly used substance in fluorescent tubes?
A
Sodium oxide and argonB
Sodium vapor and neonC
Mercury vapor and argonD
Mercury oxide and neonCorrect Answer: C. Mercury vapor and argon
90070278. Non-stick kitchenwares are coated with
A
PVCB
GraphiteC
TeflonD
SiliconCorrect Answer: C. Teflon
90129279. The most abundant inert gas in the atmosphere is
A
HeliumB
NeonC
ArgonD
KryptonCorrect Answer: C. Argon
90194280. Which one of the following is radioactive?
A
CesiumB
PlatinumC
StrontiumD
ThoriumCorrect Answer: D. Thorium
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