CDS Exam (II)- 2023 - General Knowledge Defence Question Paper

CDS Previous Year Question Papers Question Papers
CDS Exam (II)- 2023 - General Knowledge

CDS Exam (II)- 2023 - General Knowledge Defence Questions

1.
A person can see near objects clearly through his eyes but cannot see distant objects clearly. The possible reason(s) for this defect could be:
1. Excessive curvature of the eye lens.
2. The eye-ball has become too small.
3. The focal length of the eye lens is too large.
4. Elongation of the eye-ball.
Select the correct answer using the code given below:
A.
1 only
B.
2 and 4 only
C.
1 and 4 only
D.
1 and 3 only
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ANSWER :
C. 1 and 4 only
2.

Consider a journey by a car represented by the graph given below in three parts A, B and C. The speed of the car in these parts is \( v_{a} \), \( v_{b} \) and \( v_{c} \), respectively:

Which one of the following is correct in this case?

A.

\( v_{a} < v_{b} < v_{c} \)

B.

\( v_{b} > v_{a} > v_{c} \)

C.

\( v_{a} = v_{b} = v_{c} \)

D.

\( v_{a} > v_{b} ; v_{a} > v_{c} \)

😑 View Answer Error
ANSWER :

B. \( v_{b} > v_{a} > v_{c} \)

3.
A concave mirror of radius of curvature 50 cm is used to form an image of an object kept at a distance of 25 cm from the mirror on its principal axis. What will be the position of the image from the mirror?
A.
At infinity
B.
At 50 cm
C.
At 25 cm
D.
At 75 cm
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ANSWER :
A. At infinity
4.
If the Moon is brought closer to the Earth such that its distance from the Earth becomes half of the original distance, then the gravitational force of attraction between the Earth and the Moon would:
A.
reduce to half of its original value.
B.
increase to two times of its original value.
C.
remain the same as the original value.
D.
increase to four times of its original value.
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ANSWER :
D. increase to four times of its original value.
5.
Sonic boom is produced when a source of sound travels at a speed:
A.
greater than the speed of sound.
B.
greater than the speed of light.
C.
lesser than the speed of sound.
D.
equal to the speed of sound.
😑 View Answer Error
ANSWER :
A. greater than the speed of sound.
6.
Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?
A.
Ga, Sb, Pb
B.
At, Sn, Le
C.
Au, Sn, Pb
D.
Au, Sb, Pb
😑 View Answer Error
ANSWER :
C. Au, Sn, Pb
7.
How much percentage of carbon dioxide is present in the atmosphere of Venus and Mars?
A.
45 - 47%
B.
52 - 55%
C.
74 - 77%
D.
95 - 97%
😑 View Answer Error
ANSWER :
D. 95 - 97%
8.
Which among the following methods is used to separate the constituents present in a compound?
A.
Electrochemical method
B.
Heating method
C.
Fractional distillation
D.
Sublimation
😑 View Answer Error
ANSWER :
A. Electrochemical method
9.
During white-washing of walls, slaked lime reacts slowly with carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Which of the following reactions represents this correctly?
A.
\( CaO(s) + CO_{2}(g) \rightarrow CaCO_{3}(s) \)
B.
\( CaO(l) + CO_{2}(g) \rightarrow CaCO_{3}(s) \)
C.
\( Ca(OH)_{2}(l) + CO_{2}(l) \rightarrow CaCO_{3}(s) + H_{2}O(l) \)
D.
\( Ca(OH)_{2}(aq) + CO_{2}(g) \rightarrow CaCO_{3}(s) + H_{2}O(l) \)
😑 View Answer Error
ANSWER :
D. \( Ca(OH)_{2}(aq) + CO_{2}(g) \rightarrow CaCO_{3}(s) + H_{2}O(l) \)
10.
Which one of the following equations is the balanced chemical equation for the given reaction?
\( Fe + H_{2}O \rightarrow Fe_{3}O_{4} + H_{2} \)
A.
\( Fe + 4H_{2}O \rightarrow Fe_{3}O_{4} + H_{2} \)
B.
\( 3Fe + H_{2}O \rightarrow Fe_{3}O_{4} + 2H_{2} \)
C.
\( 3Fe + 4H_{2}O \rightarrow Fe_{3}O_{4} + 4H_{2} \)
D.
\( 3Fe + 4H_{2}O \rightarrow Fe_{3}O_{4} + H_{2} \)
😑 View Answer Error
ANSWER :
C. \( 3Fe + 4H_{2}O \rightarrow Fe_{3}O_{4} + 4H_{2} \)
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