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 491 Discuss
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The 'Pauli Exclusion Principle' states that:

A
no two electrons have the same set of 4 quantum numbers
B
electrons occupy lowest energy orbitals first
C
orbitals are filled singly first
D
momentum and position cannot be known simultaneously

Answer & Explanation

Correct Option: A

This principle limits each orbital to a maximum of 2 electrons with opposite spins.
Question 492 Discuss
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Which among the following is a 'Condensed' form of natural gas?

A
lpg
B
lng
C
cng
D
biogas

Answer & Explanation

Correct Option: B

Liquefied Natural Gas (LNG) is methane cooled to very low temperatures to turn it into liquid for transport.
Question 493 Discuss
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The 'Iodine Value' is used to measure the:

A
acidity of oils
B
degree of unsaturation in oils
C
saponification rate
D
peroxide content

Answer & Explanation

Correct Option: B

Higher iodine value indicates more double bonds (unsaturation) in the fat or oil.
Question 494 Discuss
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Which among the following is a 'Nucleic Acid'?

A
rna
B
hemoglobin
C
insulin
D
glycogen

Answer & Explanation

Correct Option: A

Ribonucleic acid (RNA) and Deoxyribonucleic acid (DNA) are the primary nucleic acids carrying genetic info.
Question 495 Discuss
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The 'Critical temperature' of water is approximately:

A
100 C
B
374 C
C
273 K
D
0 C

Answer & Explanation

Correct Option: B

Above 374 degrees C, water cannot be liquefied regardless of how much pressure is applied.
Question 496 Discuss
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What is the common name of 'Calcium Hydroxide'?

A
quicklime
B
slaked lime
C
limestone
D
gypsum

Answer & Explanation

Correct Option: B

Slaked lime ($Ca(OH)_2$) is formed by the reaction of quicklime with water.
Question 497 Discuss
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Which among the following is the 'Source' of Solar Energy?

A
nuclear fission
B
nuclear fusion
C
chemical oxidation
D
gravitational collapse

Answer & Explanation

Correct Option: B

Hydrogen nuclei fuse to form Helium in the Sun's core, releasing massive amounts of energy.
Question 498 Discuss
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The 'Standard Hydrogen Electrode' (SHE) has a potential of:

A
1.0 V
B
0.0 V
C
-0.76 V
D
1.1 V

Answer & Explanation

Correct Option: B

By convention, the standard potential of the hydrogen electrode is taken as zero at all temperatures.
Question 499 Discuss
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Which of the following is used in 'Non-stick' cookware?

A
pvc
B
teflon
C
polystyrene
D
polyester

Answer & Explanation

Correct Option: B

Teflon (PTFE) has very low friction and high heat resistance, preventing food from sticking.
Question 500 Discuss
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The 'Gold Number' is used to measure the power of:

A
oxidizing agents
B
protective colloids
C
catalysts
D
electrolytes

Answer & Explanation

Correct Option: B

It is the minimum amount of protective sol required to prevent coagulation of a gold sol.
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