ECAT Pre Engineering Chemistry Chapter 27 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

Try The MCQ's Test For ECAT Chemistry Chapter 27 Environmental Chemistry

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ECAT Chemistry Chapter 27 Environmental Chemistry

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Question # 1

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

Question # 2

UV radiations bring about

Question # 3

Chloroflurocarbon releases a chemical harmful to ozone

Question # 4

Chromium (VI) is highly toxic and can cause

Question # 5

Ozone in most of the tropical regions acts as a pollutant and causes

Question # 6

Carbon monoxide is pollutant as it

Question # 7

In Antarctica ozone depletion is due to the formation of following compound

Question # 8

The largest item which is recycled is

Question # 9

Ecosystem is a smaller unit of

Question # 10

Oceans cove ______ percent of the surface of the earth

Question # 11

Which of the following waste material is not recycled for use again

Question # 12

Which one of the following dissolves more rapidly in blood hemoglobin than oxygen?

Question # 13

The pH of the rain water in areas where acid rain is the cause of pollution may be

Question # 14

Which is not a component of environment

Question # 15

Shahi Qilla may be destroyed by

Question # 16

In the atmosphere, CO2is about

Question # 17

When chlorofluoro carbon are subjected to U.V. they form

Question # 18

The amount of oxygen in the lithosphere is about

Question # 19

Domestic waste mostly constitutes

Question # 20

Polycyolic aromatic hydrocarbons are taught to be

Question # 21

Phosphate pollution is caused by

Question # 22

Increasing skin cancer and high mutation rate are due to

Question # 23

The film forming components of paints are

Question # 24

Which is not a method for solid waste management

Question # 25

Which step is unnecessary for purification of water for drinking purposes

Question # 26

Water is often treated with chlorine to

Question # 27

Mottling of teeth is due to presence of an element in drinking water

Question # 28

In purification of potable water the coagulant used is

Question # 29

Acid rains are produced by

Question # 30

Atmosphere of big/metropolitan cities is polluted most by

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ECAT Chemistry Chapter 27 Important MCQ's

Sr.# Question Answer
1 Surface and ground water sources are contaminated by various human activities. Which of the followings is not a human activity that causes contamination in fresh water
A. Live stock waste
B. Oil leaks and spills
C. Disposal of industrial effluents
D. Rain
2 Classical smog occurs in palces of
A. Excess SO2
B. Low temperature
C. High temperature
D. Excess NH3
3 SO2Makes ______ acid rains
A. Carbonic acid
B. Sulfuric
C. Nitric acid
D. All of these
4 When chlorofluoro carbon are subjected to U.V. they form
A. Cations
B. Anions
C. Free radicals
D. None of these
5 Most hazardous metal pollutant of automobile exhaust is
A. Mercury
B. Lead
C. Cadmium
D. Copper
6 Potable water is considered to be
A. Safe for human consumption
B. Not safe for human consumption
C. The surface water
D. The ground water
7 In incinerating the waste is burnt at
A. 1000°C
B. 100°C
C. 2000°C
D. 1500°C
8 When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
A. Uninfluenced by occurrence of thuderstorm
B. Which depends on the amount of dust in air
C. Slightly lower than that of rain water without thunderstorm
D. Slighlty higher than that when the thunderstom is not there
9 Which gasses are produced from landfills
A. NH3
B. H2S
C. N2
D. All of these
10 As it passes into food chain, the concentration of DDT
A. Remains same
B. Decreases
C. Increases
D. Unpredictable

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