CDS Exam (I)- 2018 - General Knowledge Defence Question Paper

CDS Previous Year Question Papers Question Papers
CDS Exam (I)- 2018 - General Knowledge

CDS Exam (I)- 2018 - General Knowledge Defence Questions

1.
Which one of the following elements is used as a timekeeper in atomic clocks?
A.
Potassium
B.
Caesium
C.
Calcium
D.
Magnesium
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ANSWER :
B. Caesium
2.
Which one of the following elements is involved in the control of water content of the blood?
A.
Potassium
B.
Lithium
C.
Rubidium
D.
Caesium
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ANSWER :
A. Potassium
3.
Which one of the following gases dissolves in water to give acidic solution?
A.
Carbon dioxide
B.
Oxygen
C.
Nitrogen
D.
Hydrogen
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ANSWER :
A. Carbon dioxide
4.
Which one of the following elements is essential for the formation of chlorophyll in green plants?
A.
Calcium
B.
Iron
C.
Magnesium
D.
Potassium
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ANSWER :
C. Magnesium
5.
Consider the following chemical reaction:
\( aFe_{2}O_{3}(s) + bCO(g) \rightarrow cFe(s) + dCO_{2}(g) \)
In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?
A.
3, 2, 3, 1
B.
1, 3, 2, 3
C.
2, 3, 3, 1
D.
3, 3, 2, 1
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ANSWER :
B. 1, 3, 2, 3
6.
Why is argon gas used along with tungsten wire in an electric bulb?
A.
To increase the life of the bulb
B.
To reduce the consumption of electricity
C.
To make the emitted light colored
D.
To reduce the cost of the bulb
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ANSWER :
A. To increase the life of the bulb
7.
Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature \( (t_{c}) \)?
A.
These are two independent temperature scales
B.
\( T = t_{c} \)
C.
\( T = t_{c} - 273.15 \)
D.
\( T = t_{c} + 273.15 \)
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ANSWER :
D. \( T = t_{c} + 273.15 \)
8.
Sound waves cannot travel through a
A.
copper wire placed in air
B.
silver slab placed in air
C.
glass prism placed in water
D.
wooden hollow pipe placed in vacuum
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ANSWER :
D. wooden hollow pipe placed in vacuum
9.
Which one of the following is the value of one nanometer?
A.
\( 10^{-7} \) cm
B.
\( 10^{-6} \) cm
C.
\( 10^{-4} \) cm
D.
\( 10^{-3} \) cm
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ANSWER :
A. \( 10^{-7} \) cm
10.
Consider the following statements:
1. There is no net moment on a body which is in equilibrium.
2. The momentum of a body is always conserved.
3. The kinetic energy of an object is always conserved.
Which of the statements given above is/are correct?
A.
1, 2 and 3
B.
2 and 3 only
C.
1 and 2 only
D.
1 only
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ANSWER :
D. 1 only
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