CDS Exam (II)- 2025 - General Knowledge Defence Question Paper

CDS Previous Year Question Papers Question Papers
CDS Exam (II)- 2025 - General Knowledge

CDS Exam (II)- 2025 - General Knowledge Defence Questions

31.
Which one of the following metals is widely extracted by the electrolysis of its molten compound?
A.
Cu
B.
Au
C.
Sn
D.
Na
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ANSWER :
D. Na
32.
Which one of the following is not a property of 'graphene'?
A.
It is the thinnest material known so far.
B.
It is almost completely transparent.
C.
It is highly conducting.
D.
It is a wide band-gap semiconductor.
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ANSWER :
D. It is a wide band-gap semiconductor.
33.
Why do plastics not degrade easily?
A.
They have strong ionic bonds.
B.
They have strong covalent bonds.
C.
They have strong metallic bonds.
D.
They have very high melting points (\( > 500^{\circ}C \)).
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ANSWER :
B. They have strong covalent bonds.
34.
Which one of the following is the correct chemical formula of carboxylic acid?
A.
\( C_{3}H_{7}OH \)
B.
\( C_{3}H_{8} \)
C.
\( C_{2}H_{5}COOH \)
D.
\( CH_{3}COCH_{3} \)
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ANSWER :
C. \( C_{2}H_{5}COOH \)
35.
Which one of the following statements is not correct for benzene?
A.
Each carbon atom forms sigma bonds with two other carbon atoms with a bond angle of \( 120^{\circ} \).
B.
Delocalized electrons create a symmetrical 'cloud' of electrons above and below the plane.
C.
The length of C-C bonds is intermediate between single and double bonds.
D.
It has six isomers.
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ANSWER :
D. It has six isomers.
36.
Which one of the following is not a nitrogen fertilizer?
A.
\( (NH_{4})_{2}SO_{4} \)
B.
\( NH_{4}NO_{3} \)
C.
\( N_{2} \)
D.
\( (NH_{2})_{2}CO \)
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ANSWER :
C. \( N_{2} \)
37.
Which one of the following general electronic configurations correctly represent a transition metal element?
A.
\( (n-2)d^{1-10}ns^{2} \)
B.
\( (n-2)f^{1-14}(n-1)d^{0-1}ns^{2} \)
C.
\( ns^{2}np^{6}nd^{1-10} \)
D.
\( (n-1)d^{1-10}ns^{0-2} \)
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ANSWER :
D. \( (n-1)d^{1-10}ns^{0-2} \)
38.
Variable oxidation numbers are possible for:
A.
Sodium
B.
Calcium
C.
Iron
D.
Lithium
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ANSWER :
C. Iron
39.
Which one of the following gas smells like a rotten egg?
A.
Ammonia
B.
Hydrogen sulphide
C.
Acetylene
D.
Sulphur dioxide
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ANSWER :
B. Hydrogen sulphide
40.
The chemical reaction
\( K_{2}SO_{4}(aq) + BaCl_{2}(aq) \rightarrow 2KCl(aq) + BaSO_{4}(s) \)
is an example of:
A.
Addition reaction
B.
Displacement reaction
C.
Decomposition reaction
D.
Double displacement reaction
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ANSWER :
D. Double displacement reaction
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