CSIR UGC NET JRF Earth Sciences June 2011 Model Paper

This Test Booklet will contain 120 (20 Part `A‟+50 Part `B+50 Part „C‟) Multiple Choice Questions (MCQs). Candidates are required to answer 15 in part „A‟, 35 in Part „B‟ and 10 questions in Parts „C‟ respectively(No. of question to attempt may vary from exam to exam). In case any candidate answers more than 15, 35 and 10 questions in Parts A, B and C respectively only first 15, 35 and 10 questions in Parts A, B and C respectively will be evaluated. Questions in Parts `A‟ and „B‟ carry two marks each. In Part „C‟ each question may have sub-parts and it carry 10 marks each. There will be negative marking @25% for each wrong answers in Part „A‟ and „B‟, and no Negative marking for Part „C‟. Below each question, four alternatives or responses are given. Only one of these alternatives is the „CORRECT‟ answer to the question.

May be viewed under heading “General Science”
21. Albedo of a surface is defined by the ratio of outgoing to incoming solar radiation. Keeping this in view, which of the following surface will have the highest albedo?
1. Water
2. Sand
3. Snow
4. Forest
22. Geostrophic wind is a balance between the pressure gradient force and the Coriolis force. In non-geostrophic wind, flow will become circulatory because of
1. pressure difference term
2. momentum term
3. temperature difference term
4. shear term

23. In valley-mountain system, cold air is heavier than warm air, and thus flows down hill as a katabatic wind. In the case of an anabatic wind,
1. wind rises vertically in the valley
2. wind forms updraft and downdraft motion
3. wind will flow along the slope
4. wind will have cross mountain flow
24. Cyclones or hurricanes do not develop within about 50 N and S of the equator because the
1. pressure gradient is weak
2. trade winds converge
3. ocean surface temperature is high
4. Coriolis force is very weak
25. When statically stable air flown over a hill or ridge, it is set into oscillation. These waves are known as
1. Rossby waves
2. Kelvin waves
3. gravity waves
4. mountain waves
26. A ceaseless movement of wind and ocean currents results in global circulation because of
1. unequal distribution of oceanic and continental mass
2. radiative forcing due to Sun-Earth interaction
3. tilt of Earth’s axis
4. revolution / rotation of Earth
27. The organism that can take N2 directly from sea water is
1. foraminifera
2. cocolithophore
3. cyanobacteria
4. dinoflagellates
28. Which is the major limiting element in marine primary production?
1. sodium
2. nitrogen
3. carbon
4. argon
29. If the sea surface temperature is increased in Antarctic Ocean due to global warming, the dissolved oxygen in its deep water will
1. increase
2. initially increase and then decrease
3. decrease
4. not change
30. Hydrogenous sediment in the oceans is
1. derived from skeletal debris
2. precipitated by chemical or biochemical reactions
3. produced by weathering of rocks on land
4. ejected by volcanoes
31. Sea surface temperature (SST) is an important and variable parameter of oceans. In the Indian Ocean, SST variability has the largest amplitude on the timescale of
1. century
2. decadal
3. interannual
4. seasonal
32. The speed of current in the wind-driven Ekman layer
1. increases with depth
2. decreases with depth
3. remains constant
4. first decreases and then increases
33. Which one of the following is not true in case of the Arabian Sea?
1. seasonal high biological productivity
2. mid-depth oxygen minimum zone
3. net annual evaporation
4. net annual precipitation
34. Silicon limitation in the upper ocean will hamper the growth of
1. cocolithophos
2. foraminifera
3. diatam
4. corals
35. Which one of the following rock suites represents the oceanic lithosphere?
1. turbidite
2. ophiolite
3. seismite
4. granulite
36. Which one of the following is defined by shear strain?
1. change in length
2. change in angle
3. change in volume
4. change in area
37. Which one of the following is a measure of compressibility of a material?
1. elasticity (E) Young’s modulus
2. rigidity (G) shear modulus
3. Poisson’s ratio (γ)
4. viscosity (η)
38. Four oxygen ions of radius rc (incompressible and touching spheres) are located at the corners of a square. What will be the radius ratio rc/ra of the cation (radius: rc) lodged at the centre of the square?

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