Previous year MCQs

General science UPPSC 2019 GS-I
Question

Smog is essentially caused by the atmospheric presence of:

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Oxide of nitrogen and sulphur

Detailed Solution:

The correct answer is “Oxide of nitrogen and sulphur”.
Smog (धुंध) is primarily caused by the atmospheric presence of oxides of nitrogen and sulfur. These pollutants, along with particulate matter and volatile organic compounds, contribute to the formation of smog, especially in urban areas.

Similar Questions:

Which one of the following is not correctly matched? Pollutant – Disease caused
  1. A) Mercury – Minamata disease
  2. B) Cadmium – Itai-Itai disease
  3. C) Nitrate Ion – Blue baby syndrome
  4. D) Fluoride Ion – Indigestion
Harmful ultra-violet radiation coming from the sun can cause:
  1. A) Liver cancer
  2. B) Brain cancer
  3. C) Oral cancer
  4. D) Dermal cancer
Match List-I with List-II and select the correct answer from the code given below:
List-I (Appliance/ quantity) - List-II (Measured Instrument)

1. Pressure - A. Ammeter
2. Weight - B. Hygrometer
3. Current - C. Barometer
4. Relative Humidity - D. Spring balance

Code:
A B C D
  1. A) 2 3 4 1
  2. B) 3 4 1 2
  3. C) 4 1 2 3
  4. D) 1 2 3 4
Chemical name of limestone is?
  1. A) Calcium carbonate
  2. B) Magnesium chloride
  3. C) Sodium chloride
  4. D) Sodium sulphide
Arteether, a drug to cure malaria is obtained from a
  1. A) seed plant
  2. B) fungus
  3. C) Bacterium
  4. D) moss
If the doors of a refrigerator are left open for a few hours, the room temperature:
  1. A) will decrease
  2. B) will increase
  3. C) will remain the same
  4. D) will decrease only in the area in the vicinity of the refrigerator
Match List I with List Il and select the correct answer using the code given below
List I [Product] - List II [Source]

(A) Opium - (a) Bark
(B) Hing - (b) Root
(C) Rubber - (c) Fruit
(D) Quinine - (d) Stem
  1. A) A-a, B-b, C-c, D-d
  2. B) A-c, B-b, C-d, D-a
  3. C) A-d, B-b, C-a, D-c
  4. D) A-b, B-d, C-c, D-a
The "blue moon" phenomenon occurs:
  1. A) When two full moons occur in the same month
  2. B) When four full moons appear in two consecutive months of the same calendar year.
  3. C) when two full moons appear in the same month thrice in a calendar year
  4. D) None of the above.
Site of gaseous exchange in lungs is:
  1. A) Tracheoles
  2. B) Bronchioles
  3. C) Pulmonary vein
  4. D) Alveoli
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): CO2, SO2 and NO2 gases get dissolved in rain water and produce acid rain.
Reason (R): Atmospheric air is polluted due to high concentration of gases like carbon dioxide, sulphur dioxide and oxides of nitrogen.

Select the correct answer from the codes given below:
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B) (A) is false, but (R) is true.
  3. C) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  4. D) (A) is true, but (R) is false.
Bauxite is the ore of:
  1. A) Iron
  2. B) Copper
  3. C) Aluminium
  4. D) Gold
Which one of the following is not a natural polymer:
  1. A) wool
  2. B) silk
  3. C) leather
  4. D) nylon