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Integrated Science — First Secondary

Integrated Science — First Secondary

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Question bank: Module 10 — Chemical Reactions in the Atmosphere: Ultraviolet Radiation and Ozone

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  • Questions count: 40
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1.
Compared with visible light, ultraviolet rays have
longer wavelengths and lower energy
shorter wavelengths and higher energy
the same energy
longer wavelengths and higher energy
2.
UV lamps are used for
cooking
sterilising surgical instruments
producing sound
heating rooms
3.
Banknotes can be checked for forgery using
infrared lamps
ultraviolet lamps
radio waves
X-rays only
4.
Nitrogen, oxygen molecules and atomic oxygen absorb photons with wavelength shorter than
24 nm
240 nm
400 nm
700 nm
5.
Ozone absorbs UV photons with wavelength approximately from
100 to 240 nm
240 to 310 nm
400 to 700 nm
700 to 1000 nm
6.
Which wavelength of UV can cause photodissociation of the O₂ molecule?
230 nm
250 nm
290 nm
305 nm
7.
The first step in the formation of ozone is
O + O₂ → O₃
O₂ + UV → O + O
2O₃ → 3O₂
O₃ + UV → O₂ + O
8.
Photodissociation means
breaking of bonds by light absorption
joining of atoms by heat
melting of ice
dissolving of salt
9.
When the bond in an oxygen molecule breaks by photodissociation, the products are
two oxygen ions O²⁻
two single oxygen atoms
one atom and one ion
an ozone molecule
10.
An ozone molecule is formed by combination of
two O₂ molecules
two single O atoms
three single O atoms
one O atom and one O₂ molecule
11.
The overall equation for forming ozone from oxygen is
2O₂ → O₃
3O₂ → 2O₃
O₂ → 2O₃
3O₂ → O₃
12.
The ozone layer is mainly located in the
troposphere
stratosphere
thermosphere
exosphere
13.
The main substances responsible for ozone depletion contain
carbon and hydrogen only
chlorine and bromine
nitrogen and phosphorus
sodium and potassium
14.
CFCs stands for
carbon-fluorine compounds
chlorofluorocarbons
chlorinated fatty compounds
chemical fuel cells
15.
Which of these is a source of bromine that depletes ozone?
halon fire extinguishers
vinegar
baking soda
argon
16.
A chlorine atom acts in the ozone-depletion cycle as
a reactant that is used up
a catalyst
a product
an inhibitor
17.
One chlorine atom can destroy approximately ... ozone molecules.
10
100
1000
100 000
18.
The ozone hole was discovered in 1985 over
the Sahara
Antarctica
the Pacific Equator
the Nile Delta
19.
The Montreal Protocol (1987) aims to
limit global temperature to 2 °C
ban ozone-depleting substances
reduce plastic waste
protect whales
20.
Due to the Montreal Protocol the ozone layer
has stopped forming
has begun to recover gradually
has disappeared
has doubled in thickness
21.
Ozone depletion allows more ___ to reach Earth's surface.
infrared
ultraviolet
radio waves
microwave radiation
22.
Skin cancer is linked to UV because UV
damages the DNA of skin cells
stimulates sweating
cools the skin
increases oxygen supply
23.
The most dangerous type of skin cancer is
melanoma
eczema
acne
psoriasis
24.
The cells of the immune system affected by UV are
red blood cells
helper T cells
platelets
neurons
25.
An eye disease accelerated by UV absorption in the lens is
cataract
glaucoma
colour blindness
night blindness
26.
Which of the following is NOT a health effect of ozone-layer depletion?
skin cancer
weakened immunity
cataract
cholera
27.
Which refrigerant is ozone-friendly?
CFC-12
R-410A (no chlorine)
halon
carbon tetrachloride
28.
Which cleaning materials are recommended as ozone-friendly alternatives?
vinegar and baking soda
CFC sprays
bromine solutions
chlorine gas
29.
Ozone in the troposphere is formed from
CFCs and UV
nitrogen oxides and hydrocarbons in the presence of sunlight
argon and oxygen
CO₂ and water
30.
Smog is formed when ozone combines with
sulfur dioxide, nitrogen dioxide and fine particles
oxygen and nitrogen only
argon and neon
helium
31.
Ozone near the ground reduces photosynthesis by
increasing chlorophyll
burning plant leaves
opening stomata widely
cooling the leaf
32.
Ground-level ozone corrodes
glass
plastics and rubber
gold
granite only
33.
Smog is formed from the accumulation of products from all of the following reactions EXCEPT
nitrogen and oxygen during lightning
oxygen and sulfur under suitable conditions
hydrogen and oxygen under suitable conditions
nitrogen oxides with hydrocarbons in sunlight
34.
Which statement about ozone is correct?
ozone is always harmful
stratospheric ozone is protective, tropospheric ozone is a pollutant
tropospheric ozone is protective
ozone is formed from argon
35.
The energy of a UV photon compared with a visible photon is
lower
higher
equal
zero
36.
Which wavelength carries the greatest photon energy?
200 nm
300 nm
400 nm
700 nm
37.
Ozone destruction by UV absorption produces
O₂ + O
3O
2O₂ only
O₃ + O
38.
The unit used to measure the thickness of the ozone column is the
Dobson unit
decibel
joule
pascal
39.
The Antarctic ozone hole appears mainly in
December
spring (September–October) of the southern hemisphere
March
July
40.
Which action helps to reduce ozone depletion?
using CFC refrigerants
recycling old refrigerators so their gas is captured
using halon extinguishers
releasing aerosols
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