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

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

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

1.
Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be
A.
zinc and hydrochloric acid
B.
magnesium carbonate and hydrochloric acid
C.
methane and oxygen
D.
copper and dilute hydrochloric acid
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ANSWER :
B. magnesium carbonate and hydrochloric acid
2.
How many moles of CO can be obtained by reacting 2.0 mole of \( CH_{4} \) with 2.0 mole of \( O_{2} \) according to the equation given below?
\( CH_{4}(g) + \frac{1}{2}O_{2} \rightarrow CO + 2H_{2} \)
A.
2.0
B.
0.5
C.
2.5
D.
4.0
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ANSWER :
A. 2.0
3.
Reaction between which of the following two reactants will produce hydrogen gas?
A.
Magnesium and hydrochloric acid
B.
Copper and dilute nitric acid
C.
Calcium carbonate and hydrochloric acid
D.
Zinc and nitric acid
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ANSWER :
A. Magnesium and hydrochloric acid
4.
Which of the following characteristics is common to hydrogen, nitrogen, oxygen and carbon dioxide?
A.
They are all diatomic.
B.
They are all gases at room temperature.
C.
They are all coloured.
D.
They all have same reactivity.
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ANSWER :
B. They are all gases at room temperature.
5.
The compound \( C_{7}H_{7}NO_{2} \) has
A.
17 atoms in a molecule of the compound
B.
equal molecules of C and H by mass
C.
twice the mass of oxygen atoms compared to nitrogen atoms
D.
thrice the mass of nitrogen atoms compared to hydrogen atoms
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ANSWER :
A. 17 atoms in a molecule of the compound
6.
Which of the following is the general formula for saturated hydrocarbons?
A.
\( C_{n}H_{2n+2} \)
B.
\( C_{n}H_{2n-2} \)
C.
\( C_{n}H_{2n+1} \)
D.
\( C_{n}H_{2n-1} \)
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ANSWER :
A. \( C_{n}H_{2n+2} \)
7.
A particle moves with uniform acceleration along a straight line from rest. The percentage increase in displacement during sixth second compared to that in fifth second is about
A.
11%
B.
22%
C.
33%
D.
44%
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ANSWER :
B. 22%
8.
If two miscible liquids of same volume but different densities \( \rho_{1} \) and \( \rho_{2} \) are mixed, then the density of the mixture is given by
A.
\( \frac{\rho_{1} + \rho_{2}}{2} \)
B.
\( \frac{2\rho_{1}\rho_{2}}{\rho_{1} + \rho_{2}} \)
C.
\( \frac{2\rho_{1}\rho_{2}}{\rho_{1} - \rho_{2}} \)
D.
\( \frac{\rho_{1}\rho_{2}}{\rho_{1} + \rho_{2}} \)
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ANSWER :
A. \( \frac{\rho_{1} + \rho_{2}}{2} \)
9.
The position vector of a particle is
\( \vec{r} = 2t^{2}\hat{x} + 3t\hat{y} + 4\hat{z} \)
Then the instantaneous velocity \( \vec{v} \) and acceleration \( \vec{a} \) respectively lie
A.
on xy-plane and along z-direction
B.
on yz-plane and along x-direction
C.
on yz-plane and along y-direction
D.
on xy-plane and along x-direction
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ANSWER :
D. on xy-plane and along x-direction
10.
Two persons are holding a rope of negligible mass horizontally. A 20 kg mass is attached to the rope at the midpoint; as a result the rope deviates from the horizontal direction. The tension required to completely straighten the rope is (\( g = 10 m/s^{2} \))
A.
200 N
B.
20 N
C.
10 N
D.
infinitely large
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ANSWER :
D. infinitely large
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