Science

Q1. Which of the following is primary pollutant?

a.   CO

b.   PAN

c.   Aldehydes

d.   H2SO4

Ans.  a

Q2. Which of the following is not regarded as a pollutant?

a.   NO2

b.   CO2

c.   O3

d.   Hydrocarbon

Ans.  b

Q3. The most abundant hydrocarbon pollutant is

a.   Ethane

b.   Methane

c.   Propane

d.   Butane

Ans.  b

Q4. Which of the following is does not contribute towards the information of photochemical smog?

a.   NO

b.   SO2

c.   O3

d.   Hydrocarbons

Ans.  b

Q5. Which of the following is the biggest particulate matter?

a.   Soot

b.   H2SO4 droplets

c.   Fly ash

d.   HNO3 droplets

Ans.  c

Q6. London smog is found in

a.   summer during day time

b.   summer during morning time

c.   winter during morning time

d.   winter during day time

Ans.  c

Q7. Which of the following statement is true?

a.   SO3 is more harmful air pollutant than SO2

b.   SO2 does not affect larynx

c.   NO is more toxic to living tissues than NO2

d.   NO does not play any role in photochemical smog

Ans.  a

Q8. Which of the following is a sink for CO?

a.   Hemoglobin

b.   Microorganisms

c.   Oceans

d.   Plants

Ans.  b

Q9. Which of the following is a secondary pollutant?

a.   NO

b.   CO

c.   SO2

d.   Phenols

Ans.  d

Q10. The greatest affinity for hemoglobin is shown by

a.   NO

b.   CO

c.   O2

d.   CO2

Ans.  a

Q.11 Ozone layer present in

a.   Troposphere

b.   Stratosphere

c.   Mesosphere

d.   Exosphere

Ans.  b

Q.12 Which of the following is not a herbicide?

a.   Sodium chlorate

b.   Sodium arsenide

c.   Polyphosphate

d.   Triazines

Ans.  c

Q. 13 Poisonous gas present in the exhaust fumes of car is

a.   CH4

b.   C2H2

c.   CO

d.   CO2

Ans.  c

Q.14 Which one of the following is mainly responsible for depletion of ozone layer?

a.   Methane

b.   Carbon dioxide

c.   Water

d.   Chlorofluoro carbons

Ans.  d

Q.15 Ozone is formed in upper atmosphere from oxygen by the action of

a.   U.V. light

b.   Cosmic rays

c.   Free radicals

d.   Nitrogen oxides

Ans.  a

Q.16 The green house effect is caused by

a.   NO2

b.   NO

c.   CO

d.   CO2

Ans.  d

Q.17 DDT is

a.   a fertilizer

b.   biodegradable pollutant

c.   non-biodegradable pollutants

d.   greenhouse gas

Ans.  c

Q.18 Which of the following is the coldest region?

a.   Mesosphere

b.   Troposphere

c.   Stratosphere

d.   Thermosphere

Ans.  a

Q.19 Hottest region of the atmosphere is

a.   Mesosphere

b.   Stratosphere

c.   Thermosphere

d.   Troposphere

Ans.  c

Q.20 The point of temperature inversion between troposphere and ionosphere is called

a.   Stratosphere

b.   Exosphere

c.   Troposphere

d.   Stratosphere

Ans.  d

Q.21 Solid component of the earth consisting of soil, rocks and mountains called

a.   Hydrosphere

b.   Lithosphere

c.   Atmosphere

d.   Biosphere

Ans.  b

Q.22 Which of the following is not regarded as a pollutant?

a.   NO2

b.   CO2

c.   O3

d.   Hydrocarbons

Ans.  b

Q.23 Which of the following has largest concentration in acid rain?

a.   HNO3

b.   HCL

c.   H2SO4

d.   H2CO3

Ans.  c

Q.24 Which of the following is not a greenhouse gas?

a.   CO2

b.   Water vapour

c.   CH4

d.   O2

Ans.  d

Q.25 UV radiation from sun causes a reaction that produces

a.   Carbon monoxide

b.   Sulphur dioxide

c.   Fluorides

d.   Ozone

Ans.  d

Q.26 Ozone hole refers to

a.   hole in ozone layer

b.   reduction in thickness of ozone layer in troposphere

c.   reduction in thickness of ozone layer in stratosphere

d.   increase in concentration of ozone

Ans.  c

Q.27 Which of the following depletes ozone layer?

a.   SO2

b.   CO2

c.   CO

d.   NO and freons

Ans.  d

Q.28 White lung cancer is caused by

a.   Asbestos

b.   Ailica

c.   Paper

d.   Textiles

Ans.  d

Q.29 Hydrogen and helium are found in which of the following regions?

a.   Mesophere

b.   Exosphere

c.   Troposphere

d.   Stratosphere

Ans.  b

Q.30 Depletion of ozone layer over Antarctica takes place during

a.   Spring

b.   November

c.   Winter

d.   Summer

Ans.  a

Q.31 Law of octaves was enunciated by

a.   Doberenier

b.   Newland

c.   L. Meyer

d.   Mendeleef

Ans.  b

Q.32 Mendeleef’s periodic law is based on

a.   atomic number

b.   atomic weight

c.   number of neutrons

d.   none of these

Ans.  b

Q.33 In modern periodic table elements are arranged in order of

a.   increasing mass

b.   increasing volume

c.   increasing atomic number

d.   alphabetically

Ans.  c

Q.34 Which one of the following is not an element?

a.   Diamond

b.   Graphite

c.   Silica

d.   Ozone

Ans.  c

Q.35 Gas deviates from ideal gas nature because molecules

a.   are colorless

b.   attract each other

c.   contain covalent bond

d.   show Brownian movement

Ans.  b

Q.36 The element which shows least metallic character is

a.   indium

b.   boron

c.   aluminum

d.   gallium

Ans.  c

Q.37 Silicon hydrides are called

a.    silanes

b.   silicon-nitrogen compound

c.   silicides

d.   silicates

Ans.  a

Q.38 Which of the following is true for diamond?

a.   It is good conductor of electricity

b.   It is soft

c.   It is a bad conductor of heat

d.   It is made up of C,H and O

Ans.  c

Q.39 Natural gas is

a.   CO+H2

b.   O2

c.   CH4+O2+N2

d.   None

Ans.  d

Q.40 The temperature at which the volume of the gas is zero is

a.   0’C

b.   0 K

c.   0’F

d.   None of these

Ans.  b