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 301 Discuss
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Which chemical is used as 'Rat Poison'?

A
zinc phosphide
B
sodium carbonate
C
potassium nitrate
D
calcium oxide

Answer & Explanation

Correct Option: A

Zinc phosphide is a common rodenticide that releases toxic phosphine gas in the stomach.
Question 302 Discuss
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What is the primary component of 'Glass'?

A
sodium silicate
B
silica
C
potassium carbonate
D
boron oxide

Answer & Explanation

Correct Option: B

Silica (SiO2) is the main ingredient in most types of glass.
Question 303 Discuss
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Which gas is released during the 'Fermentation' of sugar?

A
oxygen
B
carbon dioxide
C
hydrogen
D
methane

Answer & Explanation

Correct Option: B

Yeast breaks down sugar into ethanol and CO2 in an anaerobic process.
Question 304 Discuss
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Which of the following is used to remove 'Rust Stains' from clothes?

A
citric acid
B
oxalic acid
C
acetic acid
D
benzoic acid

Answer & Explanation

Correct Option: B

Oxalic acid reacts with iron (rust) to form a soluble complex that can be washed away.
Question 305 Discuss
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The 'Anomalous Expansion' of water occurs between:

A
0 to 100 degrees c
B
0 to 4 degrees c
C
4 to 10 degrees c
D
-4 to 0 degrees c

Answer & Explanation

Correct Option: B

Water contracts when heated from 0°C to 4°C, which is unusual compared to other liquids.
Question 306 Discuss
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Which among the following is a 'Solid Lubricant'?

A
silicon
B
graphite
C
sulfur
D
phosphorus

Answer & Explanation

Correct Option: B

Graphite layers slide over each other easily, making it an excellent dry lubricant.
Question 307 Discuss
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Which chemical is used as 'Artificial Rain' material?

A
silver iodide
B
silver nitrate
C
sodium chloride
D
potassium iodide

Answer & Explanation

Correct Option: A

Silver iodide (AgI) is used in cloud seeding to induce precipitation.
Question 308 Discuss
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The main constituent of 'Shells' of sea animals is:

A
silica
B
calcium carbonate
C
magnesium carbonate
D
calcium sulphate

Answer & Explanation

Correct Option: B

Shells and corals are primarily made of CaCO3 (Calcite or Aragonite).
Question 309 Discuss
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Which of the following elements is used in 'Solar Cells'?

A
silicon
B
copper
C
silver
D
aluminum

Answer & Explanation

Correct Option: A

Silicon is a semiconductor that converts sunlight into electricity via the photovoltaic effect.
Question 310 Discuss
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Which gas is found in maximum quantity in the 'Sun'?

A
helium
B
hydrogen
C
oxygen
D
neon

Answer & Explanation

Correct Option: B

Hydrogen makes up about 73% of the Sun's mass, followed by Helium (25%).
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