📣 Paper 3 has been removed from NET from 2018 (Notification)- now paper 2 and 3 syllabus is included in paper 2. Practice both paper 2 and 3 from past papers.

NTA NET Environmental Science July 2018 Higher Questions and Answers Part 1

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Q. 1 For a thermally comfortable, seated bare bodied person at 25 °C, the maximum energy loss is due to:

(1) Radiation

(2) Convection

(3) Conduction

(4) Evaporation

Q. 2) High concentrations of pollutants at ground level during winter season are due to:

(1) Radiation inversion

(2) Subsidence inversion

(3) Frontal inversion

(4) Landscape induced inversion

Q. 3) The theme ‘Transforming our world: 2030 Agenda’ pertains to:

(1) Protection of ozone layer

(2) Climate change - Action plans

(3) Sustainable development goals

(4) Millennium development goals

Q. 4) At a latitude of , there is pressure gradient of 5.0 mb per 100 km. Given the density of air 1.25 kg/m3, the geostrophic winds will have velocity (m/s) :

(1) 5.48 m/s

(2) 54.86 m/s

(3) 109.72 m/s

(4) 27.43 m/s

Q. 5) The basic nature of lithosphere does not arise from element (s) :

(1) Na and K

(2) Ca

(3) Mg

(4) Si

Q. 6 If the tropospheric lapse rate be 6.5 °C/km and if T denotes temperature and Z denotes the altitude then:

(1) /km

(2) /km

(3) /km

(4) /km

Q. 7) Identify the statement, which best describes the second law of thermodynamics:

(1) The internal energy of the universe is constant.

(2) Energy can be neither created nor destroyed.

(3) At absolute zero, entropy of a substance is considered to be zero.

(4) When an isolated system undergoes a spontaneous change, the entropy of the universe Increases.

Q. 8) Tropical cyclones occur on:

(1) Meso - scale

(2) Micro – scale

(3) Planetary scale

(4) Synoptic scale

Q. 10) . Select the incorrect statement about the redox potential of aqueous solutions:

(1) As the concentration of molecular oxygen increases, the redox potential increases.

(2) As the concentration of hydrogen ions increases, the redox potential increases.

(3) As the concentration of molecular oxygen decreases, the redox potential decreases.

(4) As the concentration of hydrogen ions decreases, the redox potential increases.

Q. 11) Match the List - I and List - II. Identify the correct answer from the codes given below:

Match the List - I and List - II. Identify the Correct Answer from the Codes Given Below
List – IList – II
(a) Lead(i) Winkler Method
(b) Dissolved Oxygen(ii) Gravimetric Method
(c) (iii) GC-MS
(d) PAH(iv) West Gaeke Method

(1) (a) - (iii) , (b) - (iv) , (c) - (ii) , (d) - (i)

(2) (a) - (i) , (b) - (ii) , (c) - (iii) , (d) - (iv)

(3) (a) - (ii) , (b) - (iii) , (c) - (iv) , (d) - (i)

(4) (a) - (ii) , (b) - (i) , (c) - (iv) , (d) - (iii)

Q. 12 The main acidic component of the present atmosphere is:

(1) HCl

(2)

(3)

(4)

Q. 13) Identify the incorrect statement regarding PCBs:

(1) These are water soluble and hence bio accumulate.

(2) These are fire resistant.

(3) These are stable at high temperatures.

(4) These have high electrical resistance.

Q. 14 Toxicity of which of the following metals is not due to reaction with sulfhydryl group?

(1) Arsenic

(2) Cadmium

(3) Lead

(4) Chromium

Q. 15 By chemical reaction, the hydroxyl radicals fail to remove which of the following trace gases from the atmosphere?

(1) CO

(2) NO

(3)

(4) CFCs