Question # 1

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

Why a C- C bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

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environment

hydrosphere

pollutant

biosphere

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

The force which hold the atoms together to form a compound is called:

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Dispersion forces

London forces

A chemical bond

Ven der wall's forces

Splitting of spectral lines when atoms are subjected to strong electric field is called:

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Compton effect

Stark effect

Zeeman effect

Photoelectric effect

Troposphere extends upto km:

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0-15 km

10-15 km

15-40 km

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

Poisoning of CO can be reveresed by giving oxygen at pressure:

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low

least

medium

High

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Insoluble ferric oxide is produced in the pH range:

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1 to 8

6 to 9

3 to 13

8 to 13

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

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2 days

5 days

6 days

7 days

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

Ozone acts as:

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Pollutant

saver

oxidatant

All of these

Which is the following is true about galvanic cell:

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Reduction occurs at cathode

Reduction occurs at anode

Anode is negatively charged

Chathode is positively charged

Petroleum or crude oil is a complex mixture of compounds mainly:

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benzene

minerals

hydrocarbons

phenols

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