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GATE 2018 : Engineering Sciences [Section H / Atmospheric and Oceanic Sciences] (with Final Answer Keys)

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GATE 2018 Atmospheric and Oceanic Sciences (XE-H) Q. 1 Q. 9 carry one mark each & Q. 10 Q. 22 carry two marks each. Q.1 The most abundant gas in the atmosphere among inert gases is (A) Helium Q.2 (B) Argon (B) Synoptic, MJO and ENSO (D) Tidal, Milankhovich and ENSO Atmospheric vertical profile of temperature is measured by radiosonde. Equivalent instruments for measuring ocean temperature profile among the following are: (P) drifting buoy (Q) ARGO float (R) current mooring (S) XBT (A) Q, R, S Q.6 (B) Polar > Hadley > Ferrel (D) Ferrel > Hadley > Polar Analysis of an atmospheric variable shows prominent modes at 5, 40 and 1460 days. These modes correspond respectively to (A) Tidal, MJO and ENSO (C) Synoptic, MJO and Decadal Q.5 (B) Pressure, Ozone concentration (D) Temperature, Water Vapour Correct order of the maximum vertical extent of atmospheric circulation cells is (A) Hadley > Ferrel > Polar (C) Hadley > Polar > Ferrel Q.4 (D) Krypton The pair of variables that always exhibit monotonic decrease with height in the atmosphere is (A) Pressure, Temperature (C) Air Density, Pressure Q.3 (C) Neon (B) Q, S (C) R, S (D) P, R, S When deep water sinks in the North Atlantic and moves away from where it formed, it gets (A) richer in oxygen and nutrients (B) less acidic and richer in metals (C) richer in CO2 and poorer in O2 (D) richer in CO2 and O2 Q.7 The speed of sound in the ocean depends on (A) temperature alone (B) temperature and pressure (C) temperature and salinity (D) temperature, salinity and pressure XE - H 1/5

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