SSC CGL Science – Metals, Non-Metals & Metallurgy – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Metals, Non-Metals & Metallurgy – Level 2 · Exam Level · Tier I Sprint – 15 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Match the followingMatch the ore with the metal:
P. Cinnabar Q. Galena R. Calamine
1. Lead 2. Zinc 3. Mercury

Correct Answer: B [P-3, Q-1, R-2]

Explanation:

Cinnabar HgS, galena PbS, calamine ZnCO₃.

2.  
A copper strip is placed in silver nitrate solution. After some time:

Correct Answer: D [silver deposits on the strip and the solution turns blue]

Explanation:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag; copper is above silver in the reactivity series.

3.  
Aqua regia is a mixture of concentrated HCl and concentrated HNO₃ in the ratio:

Correct Answer: C [3 : 1]

Explanation:

Three parts HCl to one part HNO₃.

4.  
Odd one outOdd one out (by the main metal of the alloy):

Correct Answer: A [Duralumin]

Explanation:

Brass, bronze and German silver are copper alloys; duralumin is an aluminium alloy.

5.  
Which metal does NOT react with water even as steam?

Correct Answer: A [Copper]

Explanation:

Al, Zn, Fe react with steam; Pb, Cu, Ag, Au do not react with water.

6.  
Assertion–Reason
A: Zinc protects iron from rusting even after the zinc coating is scratched.
R: Zinc is more reactive than iron.

Correct Answer: B [Both A and R are true and R explains A]

Explanation:

Zinc corrodes first (sacrificial protection).

7.  
Froth flotation is mainly used to concentrate:

Correct Answer: C [sulphide ores]

Explanation:

Sulphide ore particles are wetted by pine oil and float with the froth.

8.  
Heating an ore strongly in excess of air is called:

Correct Answer: D [roasting]

Explanation:

Roasting – excess air (sulphides).

9.  
True/false countHow many of these statements are true?
I. All ores are minerals.
II. All minerals are ores.
III. Gangue is removed during concentration.
IV. Gold occurs in the native state.

Correct Answer: D [3]

Explanation:

Only II is false: not every mineral is profitable to mine.

10.  
Solder, used for joining electric wires, is an alloy of:

Correct Answer: C [lead and tin]

Explanation:

SoLT – Lead and Tin; low melting point.

11.  
Spot My Mistake“In electrolytic refining of copper, the pure copper is made the anode and impure copper the cathode.” The correct statement is:

Correct Answer: A [impure copper is the anode; pure copper is the cathode]

Explanation:

Impure metal dissolves from the anode; pure metal deposits on the cathode.

12.  
A gold ornament is 87.5% pure gold. Its purity in carats is:

Correct Answer: B [21 carat]

Explanation:

Answer: 21 carat. carat = 87.5 ÷ 100 × 24 = 21.

13.  
Two-quantity comparison
Quantity I: percentage of gold in 22-carat gold
Quantity II: 90%

Correct Answer: A [Quantity I > Quantity II]

Explanation:

Answer: Quantity I > Quantity II. 22/24 × 100 = 91.67% > 90%.

14.  
The thermite reaction is used for:

Correct Answer: C [welding railway tracks]

Explanation:

Fe₂O₃ + 2Al → 2Fe + Al₂O₃ gives molten iron.

15.  
Fill in the blankAn alloy of mercury with another metal is called an ___.

Correct Answer: B [amalgam]

Explanation:

Answer: amalgam. Amalgam = mercury alloy.

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