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 51 Discuss
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In which of the following liquids would anthracene dissolve easily?

A
Benzene
B
Sodium chloride
C
Methane
D
Water

Answer & Explanation

Correct Option: A

Anthracene is a non-polar organic compound and follows the 'like dissolves like' rule, making it soluble in non-polar solvents like benzene.
Question 52 Discuss
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Electrochemical cell is a device which converts chemical energy into electrical energy in a/an ____.

A
oxidation reaction
B
reduction reaction
C
direct redox reaction
D
indirect redox reaction

Answer & Explanation

Correct Option: D

In an electrochemical cell, redox reactions occur in separate half-cells, forcing electrons to flow through an external circuit.
Question 53 Discuss
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In 1960, which isotope was used to define the standard measure of length (the meter)?

A
Krypton-86
B
Krypton-88
C
Krypton-83
D
Krypton-90

Answer & Explanation

Correct Option: A

Between 1960 and 1983, the meter was defined by a specific number of wavelengths of orange-red light emitted by krypton-86.
Question 54 Discuss
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In which year did Johannes Nicolaus Bronsted and Thomas Martin Lowry propose the fundamental concept of acids and bases?

A
1928
B
1921
C
1925
D
1923

Answer & Explanation

Correct Option: D

In 1923, Bronsted and Lowry independently proposed that acid-base reactions involve the transfer of protons between molecules.
Question 55 Discuss
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Which non-essential amino acid is synthesised by the hydroxylation of phenylalanine in a reaction catalysed by phenylalanine hydroxylase?

A
Glutamine
B
Tyrosine
C
Cysteine
D
Glycine

Answer & Explanation

Correct Option: B

Tyrosine is synthesized in the body from phenylalanine; a deficiency in the enzyme responsible for this conversion causes phenylketonuria (PKU).
Question 56 Discuss
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In which year did Robert Brown observe the zigzag movement of colloidal particles in solution?

A
1829
B
1826
C
1828
D
1827

Answer & Explanation

Correct Option: D

Robert Brown discovered 'Brownian motion' in 1827 while observing pollen grains suspended in water under a microscope.
Question 57 Discuss
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The liquid water present in oceans, lakes and rivers gets converted to the gaseous form in the presence of sunlight in the water cycle. This step is called:

A
Condensation
B
Melting
C
Precipitation
D
Evaporation

Answer & Explanation

Correct Option: D

Evaporation is the phase transition from liquid to vapor that occurs at the surface of a liquid when heat energy is applied.
Question 58 Discuss
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Limestone is composed of:

A
iron oxide
B
sodium carbonate
C
aluminium oxide
D
calcium carbonate

Answer & Explanation

Correct Option: D

Limestone is a sedimentary rock primarily consisting of the mineral calcite, which is a crystalline form of calcium carbonate (CaCO3).
Question 59 Discuss
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Which of the following gases is generally used to flush bags of chips by the manufacturers?

A
Nitrogen
B
Oxygen
C
Compressed air
D
Carbon dioxide

Answer & Explanation

Correct Option: A

Nitrogen is an inert gas that displaces oxygen, thereby preventing the oxidation of fats and oils and keeping chips fresh.
Question 60 Discuss
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What is the name of the process of organic matter being broken down into simpler compounds by decomposers?

A
Respiration
B
Fermentation
C
Decomposition
D
Photosynthesis

Answer & Explanation

Correct Option: C

Decomposition is the natural process where microbes and fungi recycle nutrients by breaking down dead organic material.
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