Top 20 Previous Year Question Asked in CDS Examination

Previous Year Question Asked in CDS Examination

1. In atomic clocks, which of the following elements serves as a timekeeper?

(a) Potassium

(b) Caesium

(c) Calcium

(d) Magnesium

2. Which of the following factors is involved in the regulation of blood water content?

■ (a) Potassium

(b) Lithium

(c) Rubidium

(d) Caesium

3. Which of the following gases reacts with water to produce an acidic solution?

(a) Carbon dioxide

(b) Oxygen

(c) Nitrogen

(d) Hydrogen

4. In green plants, which of the following components is required for chlorophyll formation?

(a) Calcium

(b) Iron

(c) Magnesium

(d) Potassium

5. Consider the following chemical reaction:

aFe 2 O3 (s) + bCO(g) —> cFe (s) + dC02

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

6. In green plants, which of the following components is required for chlorophyll formation?

(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

7. Which of the following is the proper relationship between the Kelvin temperature and the Celsius temperature?

(T) and the Celsius temperature (Fc)?

(a) These are two independents

temperature scales

(b) T = t,

(c) T = TC -273-15

(d) r = (c +273-15

8. Sound waves cannot travel through a

(a) copper wire placed in air

(b) silver slab placed in the air

(c) glass prism placed in water

(d) wooden hollow pipe placed in

Vacuum

9. The value of one nanometer is equal to one of the following?

(a) 1 0 “^ cm

(b) 1 0 “^ cm

(c) cm

(d) 1 0 “^ cm

10. Consider the following statements:
11. There is no net moment in a body that is in equilibrium.
12. The momentum of a body is always conserved.
13. 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

11. Working of safety fuses depends upon
12. magnetic effect of the current
13. chemical effect of the current
14. the magnitude of the current
15. heating effect of the current selects 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.

Code:

(a) Both the statements are

individually true and Statement II

is the correct explanation?

Statement I

(b) Both the statements are

individually true but Statement II

is it not the correct explanation?

Statement I

(c) Statement I is true but Statement II

is false

(d) Statement I is false but Statement II

is true

12. 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 a few hundred

meters.

13. Statement I:

Incised meanders are formed in the

the mature stage of a river.

Statement II:

Incised meanders are characterized by

rejuvenation and upliftment of land.

14. Statement I:

Portions of glacial troughs may exhibit

15. Statement I

In the Tundra climate, biodiversity is

comparatively less.

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 in the pond are found to

have a higher concentration of pesticides

than planktons of the same pond.

remarkably flat floors.

Statement II:

The flat floor in a glacial trough is

produced by uniform glacial erosion.

19. According to the biological classification system, which of the following is a genuine fish?

(a) Silverfish

(b) Jellyfish

warm period.

(c) Cuttlefish

(d) Flying fish

20. In which one of the following types of connective tissues in animals does fat get stored?

(a) Adipocyte

(b) Chondrocyte

(c) Osteocyte

(d) Reticulocyte