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 441 Discuss
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Which among the following is used as an 'antiseptic' in soaps?

A
bithionol
B
chloroxylenol
C
terpineol
D
all of the above

Answer & Explanation

Correct Option: D

Bithionol is added to soaps to impart antiseptic properties; Dettol contains chloroxylenol and terpineol.
Question 442 Discuss
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The 'Critical Pressure' is the minimum pressure required to:

A
solidify a gas
B
liquefy a gas at its critical temperature
C
vaporize a liquid
D
reach absolute zero

Answer & Explanation

Correct Option: B

Critical pressure ($P_c$) is the pressure needed to liquefy a gas exactly at $T_c$.
Question 443 Discuss
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Which of the following is 'Dry Ice'?

A
frozen water
B
solid carbon dioxide
C
frozen nitrogen
D
solid methane

Answer & Explanation

Correct Option: B

Dry ice is solid CO2 which sublimates at -78.5 degrees C without becoming liquid.
Question 444 Discuss
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Which of the following 'Quantum Numbers' determines the shape of an orbital?

A
principal
B
azimuthal
C
magnetic
D
spin

Answer & Explanation

Correct Option: B

The azimuthal quantum number (l) defines the subshell (s, p, d, f) and its geometry.
Question 445 Discuss
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Which among the following is a 'Sublimation' material used in mothballs?

A
camphor
B
naphthalene
C
anthracene
D
all of the above

Answer & Explanation

Correct Option: D

These organic compounds transition directly from solid to gas phase at room temperature.
Question 446 Discuss
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The 'Heisenberg Uncertainty Principle' is significant for:

A
microscopic particles
B
macroscopic objects
C
stationary objects
D
all of the above

Answer & Explanation

Correct Option: A

The uncertainty in position and momentum is only measurable and relevant for tiny particles like electrons.
Question 447 Discuss
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Which of the following is not a 'Greenhouse Gas' listed under the Kyoto Protocol?

A
carbon dioxide
B
methane
C
nitrogen
D
sulphur hexafluoride

Answer & Explanation

Correct Option: C

Nitrogen is the major constituent of air and does not trap heat; CO2, CH4, and SF6 are potent GHGs.
Question 448 Discuss
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The 'Calorific Value' of a fuel is expressed in:

A
kj/kg
B
kj/mol
C
j/s
D
kwh

Answer & Explanation

Correct Option: A

It is the amount of heat produced by the complete combustion of a unit mass of fuel.
Question 449 Discuss
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Which among the following is used in the 'Lead-Acid' storage battery?

A
hcl
B
h2so4
C
hno3
D
koh

Answer & Explanation

Correct Option: B

Dilute sulphuric acid serves as the electrolyte in lead-acid batteries commonly used in cars.
Question 450 Discuss
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The 'Basicity' of orthophosphoric acid (H3PO4) is:

A
1
B
2
C
3
D
4

Answer & Explanation

Correct Option: C

H3PO4 has three replaceable hydrogen atoms bonded to oxygen, making it a tribasic acid.
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