The Hydrosphere – Old Year Questions

1. With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct?
1. OMT is measured up to a depth of 26ºC isotherm which is 129 meters in the south-western Indian Ocean during January-March.
2. OMT collected during January-March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean.
Select the correct answer using the code given below:

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

[I.A.S. (Pre) 2020]


2. Which one of the following seas is the deepest?

(a) South China Sea
(b) Bering Sea
(c) Mediterranean Sea
(d) Japan Sea

[U.P.P.C.S. (Mains) 2015]


3. The surface of the earth covered with water is approximately?

(a) One-fourth
(b) Half
(c) Two-thirds
(d) Three-fifths (3/5)

[41st B.P.S.C. (Pre) 1996]

4. On the sea level, the nearest place to the center of the earth is?

(a) North Pole
(b) Tropic of Capricorn
(c) Tropic of Cancer
(d) Tropic of Equator

[38th B.P.S.C. (Pre) 1992]


5. Datum line :

(a) Is a horizontal line to the sea level from where heights and depths are measured
(b) Is the mean of primary and secondary data
(c) International date line
(d) Is an imaginary line which passes through zero degree meridian

[U.P.P.C.S. (Pre) 1991, U.P.P.C.S. (Pre) 1994]


6. The largest part of our hydrosphere is –

(a) Atlantic Ocean
(b) Indian Ocean
(c) Pacific Ocean
(d) Antarctica Ocean

[Uttarakhand P.C.S. (Pre) 2010]


7. A ridge of 64000 km. length and 2000 km to 2400 km width passing through the north and south Atlantic oceanic basin enter into the south Pacific Oceanic basin through Indian oceanic and then from the middle of Australia and Antarctic. This ridge is –

(a) Socotra-Lakshadweep – Changos-Ridge
(b) Pacific – Antarctica Ridge
(c) Dolfin – Challenger Ridge
(d) Mid-Oceanic Ridge

[47th B.P.S.C. (Pre) 2005]


8. Out of the following which combination is incorrect?

(a) Telegraph Plateau – Indian Ocean
(b) Cocoa Ridge – Pacific Ocean
(c) Walvis Ridge – Atlantic Ocean
(d) Agulhas Basin – Indian Ocean

[M.P.P.C.S. (Pre) 2019]


9. Where is ‘Ninety East Ridge’ situated?

(a) Pacific Ocean
(b) Indian Ocean
(c) Atlantic Ocean
(d) Arctic Ocean

[53rd to 55th B.P.S.C. (Pre) 2011]


10. The tension of gravitational water in the ground is –

(a) below 1/3 atmosphere
(b) At 1.25 atmosphere
(c) At 5 atmosphere
(d) At 15 atmosphere

[U.P.U.D.A./L.D.A. (Spl) (Mains) 2010]


11. Consider the following statements:
1. On the planet Earth, the fresh water available for use amounts to about less than 1% of the total water found.
2. Of the total freshwater found on the planet Earth, 95% is bound up in polar ice caps and glaciers.
Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

[I.A.S. (Pre) 2010]


12. With reference to the water on the planet Earth, consider the following statements :
1. The amount of water in the rivers and lakes is more than the amount of groundwater.
2. The amount of water in polar ice caps and glaciers is more than the amount of groundwater.
Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

[I.A.S. (Pre) 2021]


13. The largest amount of freshwater on our planet is in

(a) River
(b) Lakes and streams
(c) Glaciers and mountains
(d) Underground water

[U.P.P.C.S. (Pre) (Re-Exam) 2015]


14. On the planet Earth, most of the freshwater exists as ice caps and glaciers. Out of the remaining freshwater, the largest proportion

(a) Is found in the atmosphere as moisture and clouds
(b) Is found in freshwater lakes and rivers
(c) Exists as groundwater
(d) Exists as soil moisture

[I.A.S. (Pre) 2013]


15. Which one is the most extensive part of the oceanic floor?

(a) Ocean Deeps
(b) Oceanic Slope
(c) Oceanic Shelves
(d) Deep Sea Plains

[Uttarakhand P.C.S. (Pre) 2012]