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

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jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 291 Discuss
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Which metal is the best conductor of electricity?

A
copper
B
gold
C
silver
D
aluminum

Answer & Explanation

Correct Option: C

Silver has the highest electrical conductivity of all metals, followed by copper.
Question 292 Discuss
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The 'Ozone Layer' in the upper atmosphere protects us from:

A
infrared rays
B
ultraviolet rays
C
visible light
D
x-rays

Answer & Explanation

Correct Option: B

Ozone (O3) absorbs high-energy UV-B and UV-C radiation from the sun.
Question 293 Discuss
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Which of the following is an 'Alloy of Mercury'?

A
brass
B
bronze
C
amalgam
D
steel

Answer & Explanation

Correct Option: C

An amalgam is an alloy of mercury with another metal (except iron, platinum, etc.).
Question 294 Discuss
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Which chemical is used in 'Dry Cleaning'?

A
petrol
B
benzene
C
perchloroethylene
D
methanol

Answer & Explanation

Correct Option: C

Tetrachloroethylene (perc) is the standard solvent used in dry cleaning to remove stains.
Question 295 Discuss
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What is the common name of 'Sodium Bicarbonate'?

A
baking soda
B
washing soda
C
caustic soda
D
bleaching powder

Answer & Explanation

Correct Option: A

NaHCO3 is commonly used in baking as a leavening agent.
Question 296 Discuss
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Which of the following is used as 'Solder' for joining wires?

A
lead and zinc
B
tin and lead
C
copper and tin
D
aluminum and iron

Answer & Explanation

Correct Option: B

Solder is an alloy of tin and lead with a low melting point.
Question 297 Discuss
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Which metal is stored in 'Kerosene' due to its high reactivity?

A
magnesium
B
sodium
C
calcium
D
zinc

Answer & Explanation

Correct Option: B

Sodium reacts vigorously with air and water, so it must be kept submerged in kerosene.
Question 298 Discuss
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What is the chemical name of 'Quick Lime'?

A
calcium hydroxide
B
calcium oxide
C
calcium carbonate
D
calcium sulphate

Answer & Explanation

Correct Option: B

CaO is quicklime; when it reacts with water, it forms Ca(OH)2 (slaked lime).
Question 299 Discuss
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Which among the following is the 'Heaviest Natural Element'?

A
lead
B
mercury
C
uranium
D
gold

Answer & Explanation

Correct Option: C

Uranium (atomic number 92) is the heaviest element occurring naturally in significant amounts.
Question 300 Discuss
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Which of the following is a 'Noble Metal'?

A
iron
B
aluminum
C
gold
D
copper

Answer & Explanation

Correct Option: C

Noble metals (Gold, Platinum, Silver) are resistant to corrosion and oxidation in moist air.
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