General Science (Chemistry) Practice Sets For Competitive Exam P28

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Page 28

90018271. Bhopal gas tragedy is associated with leakage of

A

carbon dioxide

B

nitrogen dioxide

C

sulphur dioxide

D

methyl isocyanate

D

Correct Answer: D. methyl isocyanate

90062272. Litmus is obtained from

A

a bacterium

B

a fungus

C

an alga

D

lichen

D

Correct Answer: D. lichen

90039273. Dry powder fire extinguishers contain

A

sand

B

sand and sodium carbonate

C

sand and potassium carbonate

D

sand and sodium bicarbonate

D

Correct Answer: D. sand and sodium bicarbonate

90053274. Helium gas is filled in ballons because

A

its atomic number is 2

B

it is lighter than air

C

it is one of the constituents of water

D

it is a noble gas

B

Correct Answer: B. it is lighter than air

90021275. Brass is an alloy of

A

Lead and tin

B

Zinc and copper

C

Antimony, tin and lead

D

Zinc, tin and copper

B

Correct Answer: B. Zinc and copper

90050276. Gold dissolves in

A

Hydrochloric acid

B

Nitric acid

C

Aqua-regia

D

Acetic acid

C

Correct Answer: C. Aqua-regia

90160277. What is the most commonly used substance in fluorescent tubes?

A

Sodium oxide and argon

B

Sodium vapor and neon

C

Mercury vapor and argon

D

Mercury oxide and neon

C

Correct Answer: C. Mercury vapor and argon

90070278. Non-stick kitchenwares are coated with

A

PVC

B

Graphite

C

Teflon

D

Silicon

C

Correct Answer: C. Teflon

90129279. The most abundant inert gas in the atmosphere is

A

Helium

B

Neon

C

Argon

D

Krypton

C

Correct Answer: C. Argon

90194280. Which one of the following is radioactive?

A

Cesium

B

Platinum

C

Strontium

D

Thorium

D

Correct Answer: D. Thorium

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