2011 CSIR NET JRF solved question paper part 1

CSIR NET JRF Life science December question and answer paper June 2011.

1. A physiological disorder X always leads to the disorder Y. However, disorder Y may occur by itself. A population shows 4% incidence of disorder Y. Which of the following inferences is valid?

A. 4% of the population suffers from both X&Y
B.Less than 4% of the population suffers fromX
C.At least 4% of the population suffers f fromX
D.There is no incidence of X in the given population

2. Exposing an organism to a certain chemical can change nucleotide bases in a gene, causing mutation. In one such mutated organism if a protein had only 70% of the primary amino acid sequence, which of the following is likely?
A.Mutation broke the protein
B.The organism could not make amino
C.Mutation created a terminator codon
D.The gene was not transcribed

3. A reference material is required to be prepared with 4 ppm calcium. The amount of CaC03 (molecular weight = 100) required to prepare 1000 g of such a reference material is
A. 10 micro grams
B. 4 micrograms
C. 4 mg
D. 10 mg

4.Standing on a polished stone floor one feels colder than on a rough floor of the same stone. This is
A.Thermal conductivity of the stone depends on the surface smoothness
B.Specific heat of the stone changes by polishing it
C.The temperature of the polished floor is lower than that of the rough floor
D.There is greater heat loss from the soles of the feet when in contact with the polished floor than with the rough floor

5.Popular use of which of the following fertilizers increases the acidity of soil?
A.Potassium Nitrate
C.Ammonium sulphate
D.Superphosphate of lime

6. If the atmospheric concentration of carbon dioxide is doubled and there are favourable conditions of water, nutrients, light and temperature, what would happen to water requirement of plants?
A.It decreases initially for a short time and then returns to the original value
B.It increases
C.It decreases
D.It increases initially for a short time and then returns to the original value

7.The graph represents the depth profile of temperature in the open ocean; in which region this is likely to be prevalent?

A.tropical region
B.Equatorial region
C.Polar Region
D. Sub tropic region

8.Glucose molecules diffuse across a cell of diameter d in time t. If the cell diameter is tripled, the diffusion time
A.increase to 9t
B.decrease to t/3
C.increase to 3r
D.decrease to t/9

9.Identify the figure which depicts a first order reaction.

A. 1
B. 2
C. 3
D. 4

10.which of the following particles has the largest range in a given medium if their initial energies are the
A. alpha
B. electron
C. positron
D. gamma

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