Air [NTA-NET (UGC-NET) Environmental Science (89)]: Questions 19 - 22 of 99

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Question 19

Appeared in Year: 2020

Question Match List-Ⅰ List-Ⅱ▾

Match List I (Air pollutant) with List II (Control technique/equipment)

List-Ⅰ (Air Pollutant)List-Ⅱ (Control Technique/Equipment)
(A)

PM2.5

(i)

Scrubber

(B)

NOX

(ii)

Electrostatic precipitator

(C)

SO2

(iii)

Cyclone collectors

(D)

Coarse particulate matter

(iv)

Selective catalytic reduction

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (ii)
  • (iv)
  • (i)
  • (iii)

b.

  • (iv)
  • (iii)
  • (ii)
  • (i)

c.

  • (iii)
  • (ii)
  • (i)
  • (iv)

d.

  • (ii)
  • (iii)
  • (iv)
  • (i)

Edit

Question 20

Appeared in Year: 2015

Question MCQ▾

Which of the following air pollutants are released by thermal power plants? - (June)

(1) Oxides of nitrogen (2) Oxides of Sulphur

(3) Ammonia (4) Carbon monoxide

Choose the correct answer:

Choices

Choice (4)Response

a.

1,3 and 4 only

b.

2 and 3 only

c.

1,2, 3 and 4

d.

1,2 and 4 only

Edit

Question 21

Appeared in Year: 2018

Question MCQ▾

The dominant mechanism (s) of deposition of aerosol particles in the size range 5 – 10 µm in the respiratory tract are:

(i) Sedimentation

(ii) Impaction

(iii) Diffusion

Choose the correct answer from the code given below:

Choices

Choice (4)Response

a.

i, ii and iii

b.

Only i and ii

c.

Only ii and iii

d.

Only i and iii

Edit

Question 22

Appeared in Year: 2016

Question MCQ▾

An electrostatic precipitator has collection efficiency of for fine particles of a dirty

gas. Its collection area of plates is and gas flow rate is . If the migration

velocity of the particles is changed by by changing the electric field, what will be

the change in collection efficiency? (September)

Choices

Choice (4)Response

a.

0.05

b.

0.005

c.

0.10

d.

0.001

Edit