cbsenet.nic.in NET Environmental Sciences Paper III Model Question : Central Board Of Secondary Education

Organisation : Central Board Of Secondary Education
Exam : National Eligibility Test (NET)
Document Type : Model/Previous Question Paper
Subject : Environmental Sciences
Date/Year : 10.07.2016 & 28.08.2016

Website : http://cbsenet.nic.in/cbsenet/QuestionPaperJuly2016.aspx
Download Sample Question Paper :
Paper III 10.07.2016 : https://www.pdfquestion.in/uploads/10795-EnvScience.pdf
Paper III 28.08.2016 : https://www.pdfquestion.in/uploads/10795-EnvScience28.pdf

Environmental Sciences Model Question :

Time : 2 1/2 hours
Maximum Marks : 150
Note :
** This paper contains seventy five (75) objective type questions of two (2) marks each.
** All questions are compulsory.

Related : Central Board Of Secondary Education NET Electronic Science Paper III Model Question : www.pdfquestion.in/10791.html

1. In India audit on conservation and protection of tigers in all 28 Tiger reserves was conducted in
(1) 2001
(2) 2004
(3) 2006
(4) 2007

2. In the screening stage of EIA, the impact level of a development project is not discernible, then what step should be adopted ?
(1) Scoping stage ought to be initiated
(2) Detailed EIA study ought to be conducted
(3) A rapid EIA study ought to be conducted
(4) The project may not be given environmental clearance

3. Biodiversity hotspots are regions of high
(1) stationary population of common species
(2) richness of endemic species
(3) migratory population
(4) richness of dominant species

4. Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : Ocean Thermal Energy Conversion (OTEC) plants have very low efficiencies.
Reason (R) : The temperature difference between warm surface water and cold deeper ocean water is not all that great.
Choose the correct answer :
(1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3) (A) is true but (R) is false.
(4) (A) is false but (R) is true.

5. In respect of geothermal power production, identify the correct sequence of the countries :
(1) Iceland > Russia > Japan > USA
(2) Japan > Iceland > USA > Russia
(3) USA > Iceland > Japan > Russia
(4) USA > Japan > Iceland > Russia

6. Among the forest types of India, which category of forest covers maximum geographical area :
(1) Tropical grassland
(2) Mangrove forest
(3) Tropical deciduous forest
(4) Temperate evergreen forest

7. The overall diversity of a landscape comprising several ecosystems is known as
(1) Alpha diversity
(2) Beta diversity
(3) Gamma diversity
(4) Delta diversity

8. The ratio between the amount of radiation emitted by earth upto the wavelength at which maximum radiation is emitted and total amount of radiation emitted by earth is approximately
(1) ~ 25%
(2) ~ 50%
(3) ~ 40%
(4) ~ 66%

9. Milankovitch cycles refer to
(1) Shifts in the temperature of surface water in the middle latitudes of the Pacific Ocean.
(2) The timing of the northern lights in the thermosphere.
(3) The changes in the Earth’s rotation and orbit around the sun that may trigger climate variation.
(4) Upwelling and down-welling in the ocean.

10. El Nino and La Nina phenomena
(1) decrease water temperatures in the eastern Pacific Ocean
(2) increase water temperatures in the Gulf of Mexico
(3) occur in a definite pattern every ten years
(4) cause changes in global temperature and precipitation pattern

11. Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : At a constant temperature, the solubility of ammonia in water increases with decrease in pH.
Reason (R) : The solubility of all gases increase with decrease in pH.
Choose the correct answer :
(1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3) (A) is true but (R) is false.
(4) (A) is false but (R) is true.

12. Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : Temperature of sea water generally decreases with increasing latitude.
Reason (R) : Surface layers of sea water tend to contract and sink in cold waters.
Choose the correct answer :
(1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3) (A) is true but (R) is false.
(4) (A) is false but (R) is true.

13. A normal sand dune is characterized by
(1) Gentle windward and steeper leeward sides.
(2) Both gentle sides.
(3) Steeper windward and gentle leeward sides.
(4) Both steeper sides.

14. Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : The distribution of animals over the world is much more complex and irregular compared to plants.
Reason (R) : The animals are mobile and therefore capable of more rapid dispersal.
Choose the correct answer :
(1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3) (A) is true but (R) is false.
(4) (A) is false but (R) is true.

15. Consider the following statements in case of Gaussian Plume Model.
a. The wind speed is constant both in time and with elevation.
b. The emission rate from the source is constant.
c. The pollutant is conservative.
Choose the answer :
(1) a only (2) b only
(3) a and b only (4) a, b and c

16. A stream flowing at 5.0 m3/s converges with another stream with the same flow rate. The concentration of the phosphate upstream to the junction is 10.0 mg/L and that in the other stream is 5.0 mg/L. The downstream concentration of phosphate is
(1) 2.5 mg/L
(2) 5.0 mg/L
(3) 7.5 mg/L
(4) 10 mg/L

17. Lotka-Volterra model for an ecosystem can be used to study
a. oscillations in prey-predator population.
b. effect of predator on prey population.
c. effect of prey on predator population.
Choose the correct answer :
(1) a and b only (2) b and c only
(3) a and c only (4) a, b and c

18. In an ecosystem following logistic growth model initial population was 900 with growth rate constant of 0.1. If the carrying capacity of the ecosystem is 1000, what is the instantaneous rate of change of population ?
(1) 10
(2) 25
(3) 1.1
(4) 9

19. Choose an appropriate hypothesis testing method for the condition where the variance is an unknown parameter of a population of independent observations :
(1) Z-test
(2) 2-test
(3) t-test
(4) F-test

20. For sampling error of 1.96s; where s is the standard deviation, and at critical value of 1.96, the significance level is
(1) 5.0 %
(2) 1.0 %
(3) 2.7 %
(4) 4.5 %