CDS Exam (II)- 2021 - General Knowledge Defence Question Paper

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CDS Exam (II)- 2021 - General Knowledge

CDS Exam (II)- 2021 - General Knowledge Defence Questions

1.
Where should an object be placed in front of a convex lens to get a real and enlarged image of the object?
A.
At twice the focal length
B.
At infinity
C.
Between the principal focus and twice the focal length
D.
Beyond twice the focal length
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ANSWER :
C. Between the principal focus and twice the focal length
2.
The magnetic field lines inside a current carrying long solenoid are in the form of
A.
ellipse.
B.
parabola.
C.
hyperbola.
D.
parallel straight lines.
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ANSWER :
D. parallel straight lines.
3.
A ray of light travelling from a rarer medium to a denser medium
A.
slows down and bends away from the normal.
B.
slows down and bends towards the normal.
C.
speeds up and bends away from the normal.
D.
speeds up and bends towards the normal.
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ANSWER :
B. slows down and bends towards the normal.
4.
An electric circuit is consisting of a cell, ammeter and a nichrome wire of length \( l \). If the length of the wire is reduced to half (\( l/2 \)), then the ammeter reading
A.
decreases to one-half.
B.
gets doubled.
C.
decreases to one-third.
D.
remains unchanged.
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ANSWER :
B. gets doubled.
5.
What is the effect of pressure of a human body on sand?
A.
Larger while standing than while lying
B.
Smaller while standing than while lying
C.
Same while standing or lying
D.
Larger while standing during the daytime and smaller during the night time while lying
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ANSWER :
A. Larger while standing than while lying
6.
An athlete completes one round of a circular track of diameter 100 m in 20 s. What will be the displacements after 1 minute and 10 s, respectively?
A.
0 m, 50 m
B.
300 m, 100 m
C.
300 m, 50 m
D.
0 m, 100 m
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ANSWER :
D. 0 m, 100 m
7.
Which of the following statements about universal indicator is/are true?
1. It is a mixture of several indicators.
2. It shows different colours at different concentrations of hydrogen ions in solution.
3. It helps to determine the strength of given acid and base in titration.
Select the correct answer using the code given below:
A.
1 only
B.
1 and 2 only
C.
2 and 3 only
D.
1, 2 and 3
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ANSWER :
B. 1 and 2 only
8.
Which of the following carbon allotropes is/are good conductor(s) of electricity?
1. Diamond
2. Graphite
3. Fullerene
Select the correct answer using the code given below:
A.
1 only
B.
1 and 2 only
C.
2 only
D.
1 and 3 only
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ANSWER :
C. 2 only
9.
What is the approximate percentage of carbon in the Earth's crust?
A.
0.045%
B.
0.02%
C.
0.015%
D.
0.005%
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ANSWER :
B. 0.02%
10.
When copper reacts with moist carbon dioxide (\( CO_{2} \)) in air, it forms a green coating of which one of the following compounds?
A.
Cupric carbonate
B.
Cuprous oxide
C.
Cupric oxide
D.
Copper sulphate
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ANSWER :
A. Cupric carbonate
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