UPSC CDS Exam I GK questions 

Below is a list of Union Public Service Commission Combined Defence Services Exam (I) 2018 General Knowledge questions.

UPSC CDS Exam I GK questions

Q1. Which one of the following elements is used as a timekeeper in
atomic clocks?

(a) Potassium (b) Caesium
(c) Calcium (c) Magnesium

Q2. 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

Q3. Which one of the following gases dissolves in water to give acidic solution?
(a) Carbon dioxide (b) Oxygen (c) Nitrogen
(d) Hydrogen

Q4. Which one of the following elements is essential for the formation of chlorophyll in green plants?
(a) Calcium (b) Iron
(c) Magnesium (d) Potassium

Q5. Consider the following chemical reaction:
aFe2O3(s) + bCO(g) -> cFe(s) + dCO2 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

Q6. 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

Q7. Which one of the following is the correct relation between the
Kelvin temperature (T) and the Celsius temperature (tc)?
(a) These are two independent temperature scales
(b) T= tc (c) T= tc- 273.15
(d) T=tc + 273.15

Q8. 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

Q9. 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

Q10. 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) 1and 2 only
(d) 1 only

Q11. Working of safety fuses depends upon

  1. magnetic effect of the current
  2. chemical effect of the current
  3. magnitude of the current
  4. heating effect of the current
    Select the correct answer using the code given below.
    (a) 1, 2, 3 and 4
    (b) 1, 2 and 3 only
    (c) 3 and 4 only
    (d) 4 only

Directions: The following seven (7) items consist of two statements, Statement I and Statement II.
Examine these two statements carefully and select the correct answer using the code given below.

(a) Both the statements are individually true and
Statement II is the corrct explanation of Statement I
(b) Both the statements are individually true but Statement II is not the
correct explanation of Statement I
(c) Statement I is true but Statement II is false
(d) Statement I is false but Statement II is true

Q12. Statement I : By far the most common topographic form in a Karst
terrain is the sinkhole.
Statement II: Topographically, a sinkhole is a depression that varies
in depth from less than a meter to few hundred meters.

Q13. Statement I: Incised meanders are formed in the mature stage of a river.
Statement II: Incised meanders are characterized by rejuvenation and upliftment of land.

Q14. Statement I: Portions of glacial troughs may exhibit remarkably flat
Statement II: The flat floor in a glacial trough is produced by
uniform glacial erosion.

15. Statement I :In Tundra climate, biodiversity is comparatively less.
Statement II : Tundra climate has less reproductive warm period.

16. Statement I : Tides are the rise and fall of sea levels caused by the
combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
Statement II :The Earth rotates from west to east.

17. Statement I : A person may suffer from tuberculosis if she/he
frequently visits crowded place.
Statement II : Bacteria of tuberculosis spread through droplets by
sneezing or coughing.

18. Statement I : Bioaccumulation is a process of progressive accumulation of heavy metals and pesticides in an organism.
Statement II : Large fishes of the pond are found to have higher
concentration of pesticides than planktons of the same



  • 1 ……. B
  • 2 ……. A
  • 3 ……. A
  • 4 ……. C
  • 5 ……. B
  • 6 ……. A
  • 7 ……. D
  • 8 ……. D
  • 9 ……. A
  • 10 ….. C
  • 11 ….. C
  • 12 ….. B
  • 13 ….. A
  • 14 ….. B
  • 15 ….. A
  • 16 ….. B
  • 17 ….. A
  • 18 ….. A
  • 19 ….. D
  • 20 ….. A
  • 21 ….. C
  • 22 ….. C
  • 23 ….. C
  • 24 ….. C
  • 25 ….. A
  • 26 ….. A
  • 27 ….. A
  • 28 ….. B
  • 29 ….. A
  • 30 ….. D
  • 31 ….. D
  • 32 ….. C
  • 33 ….. C
  • 34 ….. D
  • 35 ….. C
  • 36 ….. D
  • 37 ….. C

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