General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

General Science

jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 241 Discuss
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The process of 'vulcanization' of rubber involves heating raw rubber with:

A
carbon
B
sulphur
C
phosphorus
D
silicon

Answer & Explanation

Correct Option: B

Sulphur creates cross-links between polymer chains, improving the strength and elasticity of rubber.
Question 242 Discuss
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Which of the following is used as a 'moderator' in a nuclear reactor?

A
cadmium
B
boron
C
heavy water
D
liquid sodium

Answer & Explanation

Correct Option: C

Moderators like Heavy water (D2O) or Graphite slow down fast-moving neutrons to maintain a chain reaction.
Question 243 Discuss
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Which gas is used in the manufacture of vanaspati ghee from vegetable oils?

A
oxygen
B
nitrogen
C
hydrogen
D
helium

Answer & Explanation

Correct Option: C

Hydrogenation of unsaturated vegetable oils in the presence of a Nickel catalyst produces solid fat (ghee).
Question 244 Discuss
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Which of the following has the maximum density?

A
water at 0 degrees c
B
water at 4 degrees c
C
ice at 0 degrees c
D
water at 100 degrees c

Answer & Explanation

Correct Option: B

Water reaches its maximum density at 4°C due to the unique way hydrogen bonds and volume change.
Question 245 Discuss
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Which substance is used to retard the setting time of cement?

A
gypsum
B
alumina
C
silica
D
limestone

Answer & Explanation

Correct Option: A

Gypsum (Calcium sulphate dihydrate) is added to prevent cement from hardening too quickly upon adding water.
Question 246 Discuss
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The bleaching action of Chlorine is due to:

A
reduction
B
oxidation
C
hydration
D
substitution

Answer & Explanation

Correct Option: B

Chlorine reacts with water to release nascent oxygen, which oxidizes colored substances to colorless ones.
Question 247 Discuss
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Which of the following is a neutral oxide?

A
mgo
B
co2
C
no
D
na2o

Answer & Explanation

Correct Option: C

Nitric oxide (NO) and Carbon monoxide (CO) are neutral; MgO/Na2O are basic, and CO2 is acidic.
Question 248 Discuss
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What is the hybridisation of Carbon in graphite?

A
sp
B
sp2
C
sp3
D
dsp2

Answer & Explanation

Correct Option: B

In graphite, each carbon atom is bonded to three others in a hexagonal layer using sp2 hybridisation.
Question 249 Discuss
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Which chemical is known as 'Pearl Ash'?

A
sodium carbonate
B
potassium carbonate
C
calcium carbonate
D
magnesium carbonate

Answer & Explanation

Correct Option: B

Potassium carbonate (K2CO3) was historically obtained from wood ash and is called Pearl Ash.
Question 250 Discuss
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Which of the following noble gases is not present in the atmosphere?

A
argon
B
helium
C
radon
D
neon

Answer & Explanation

Correct Option: C

Radon is a radioactive gas formed in the ground; it is absent from the general atmosphere.
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