Part A-Dec 2011

CSIR-UGC National Eligibility Test (NET) for Junior Research Fellowship and Lecturer-ship

PREVIOUS SOLVED QUESTIONS – 2011 DECEMBER CSIR – NET EXAM

1. During a total solar eclipse occurring at noon, it becomes dark enough for a few minutes for stars to become visible. The stars that are seen are those which will be seen from the same location

1. On the following night only 2. On the night one month later 3.On the night three months later
4.On the night six months later
Ans.   4

Expln:- Eclipses do not occur every month during a new moon or a full moon. This is because the orbit of the moon is titled by about five degrees with respect to the earth’s orbit, so that usually the moon passes slightly above/below the line between the sun and the earth. Thus at most new and full moons, the shadows miss their….

2. Restriction endonuclease cleaves DNA molecules at specific ‘recognition sites’. One such enzyme has four recognition sites on a circular DNA molecule. After complete digestion, how many fragments would be produced upon reaction with this enzyme ?

1. 4 2. 5 3.3 4.6

Ans.   1

Expln:- If you cut a linear DNA you will get one more fragment than you have restriction endonuclease sites. When cutting circular DNA, you get the same number of fragments as there are RE sites…..

3.     See the following mathematical manipulations.

(i) Let x = 5
(ii) then x2-25 = x-5
(iii) (x-5) (x+5) = x-5
(iv) x + 5 = 1 [cancelling (x-5) from both sides] (v) 10 = 1 [Putting x=5]

Which of the above is the wrong step ?

1. (i) 2. (ii) to (iii) 3.(iii) to (iv) 4.(iv) to (v)

Ans.   4

Expln:-
x2 = 25
Ie; 25 – 25 = 0
X = 5
Ie; 5 – 5 = 0

4.     Inner planets of the solar system are rocky, whereas outer planets are gaseous. One of the reasons for this is that

1. solar heat drove away the gases to the outer region of the solar system 2. gravitational pull of the sun pulled all rocky material to the inner solar system 3.outer planets are larger than the inner planets 4.comets delivered the gaseous materials to the outer planets

Ans.   1

Expln:- Many of the original theories of the formation of our solar system postulated that a proto-planetary disk of dust and gas that surrounded our sun some 4.5 billion years ago, and this disk rotated around the sun, just as we orbit the same star now. The most popular theory put forth the idea that within this spinning disk, the heavier, metallic-elements (silicates and so forth) would fall in towards the star, and the lighter elements, mainly Hydrogen and Helium….

5.     In Δ ABC, angle A is larger than angle C and smaller than angle B by the same amount. If angle B is 67°, angle C is

1. 67°   2. 53°   3.60°   4.57°

Ans.   2

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