Environmental Chemistry Test

Result

Environmental Chemistry Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

The acid rain possesses:

A
sulphuric acid

B
nitric acid

C
sulphurous acid

D
all of these

Solution
Question 2
1 / -0

Which statement is not correct?

A
$$CO$$ is the main air pollutant

B
All pollutants are not wastes

C
Water is polluted by dissolved oxygen

D
Lichens are pollution indicators

Solution
Question 3
1 / -0

The knocking will be maximum when the mixture of the fuel is

A
straight-chain

B
iso-chain

C
neo-chain

D
none of these

Solution

Order of octane no.:
straight-chain compounds < iso-chain compounds < neo-chain compounds

So, the knocking will be maximum in compound with the lowest octane number, and of the above compounds, straight-chain compounds have the lowest value of octane number.

So, knocking will be maximum in straight-chain compounds.
Hence, Option "A" is the correct answer.
Question 4
1 / -0

Which of the following substance is used as an anti nock compound?

A
TEL

B
Lead tetrachloride

C
Lead acetate

D
$$\mathrm{ C_{2}H_{5}PbCl} $$

Solution

In many processes, TEL (Tetra Ethyl Lead) is used a antiknock compound.
Hence, Option "A" is the correct answer.
Question 5
1 / -0

DDT is :

A
an antibiotic

B
a fertilizer

C
a non-degradable pollutant

D
dichlorodifluorotitanium

Solution
Question 6
1 / -0

Pollutant is a chemical substance or factor which disturbs:

A
our balanced environment

B
geochemical cycles

C
flora of any region

D
fauna of any region

Solution

Chemical pollution introduces chemicals into the natural environment, negatively affecting the air, water, and soil. Such pollutants can come from a wide variety of sources. When chemical pollutants are concentrated in an area for a period, they can adversely affect the ecosystem and those who live in the area.

$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (A)}.$$
Question 7
1 / -0

The basic component of smog is:

A
PAN

B
PBN

C
NO$$_2$$

D
all of these

Solution
Question 8
1 / -0

An object is located at a height of $$5\ km$$ from the surface of the earth. The object is located in which part of the atmosphere?

A
Thermosphere

B
Mesosphere

C
Stratosphere

D
Troposphere

Solution

Troposphere extends upto 10 km from the earth's surface. Since, the object is 5 km above the surface of the earth, it is present in troposphere.
Question 9
1 / -0

if there were no atmosphere around in the earth, then what will be the temperature of the earth.

A
Increase

B
Go on decreasing

C
Increase during day and decrease during night

D
be unaffected

Solution

If there were no atmosphere around the earth, the temperature of the earth will increase during day and decrease during night. In the absence of atmosphere around the earth, it will be like a moon. There would be no life, no winds, no rains, no fires, no protection against harmful solar radiations. Due to absence of atmosphere around the moon, the temperature ranges from -190 $^{0}$ C to 110 $^{0}$ C. Air is a bad conductor of heat. The atmosphere has an average temperature of the earth almost steady during the day and night. It prevents sudden increase in temperature during the day time. Also, it decreases the rate of escape of heat during night time. The correct answer is options C
Question 10
1 / -0

Smog is a combination of:

A
Smoke and fog

B
Smoke and light

C
Fog and light

D
All are correct

Solution

Smog is formed when the smoke particles combines with the already occurring fog. Fog is nothing but the water droplets suspended in the environment near the earth's surface.
Smoke and light will cause the scattering of light, while fog and light will have no effect on the formation of smog.