FBISE, NCP & NBF-aligned resources for Classes 9–12
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Chemistry Chapter 11 : Topic 4
Greenhouse Gases and Warming
1 / 20
How do greenhouse gases like carbon dioxide and methane primarily contribute to global warming?
Reasoning: CO₂ and CH₄ absorb infrared (heat) radiation emitted by Earth and re-emit it, preventing heat loss to space and warming the atmosphere.
2 / 20
Which process is most directly responsible for the warming effect of greenhouse gases?
Reasoning: Greenhouse gases trap heat by absorbing infrared radiation and re-emitting it in all directions, including back to Earth.
3 / 20
Why does Earth become warmer when carbon dioxide concentration increases?
Reasoning: CO₂ absorbs outgoing infrared radiation from Earth’s surface, reducing heat loss to space.
4 / 20
Methane is considered a stronger greenhouse gas than carbon dioxide because it:
Reasoning: Methane has a higher heat absorption capacity, making it more efficient at trapping heat than CO₂.
5 / 20
What is the main reason Earth does not lose all its heat energy immediately into space?
Reasoning: Greenhouse gases absorb outgoing infrared radiation and re-radiate it, slowing heat loss.
6 / 20
Which statement best explains the “greenhouse effect” mechanism?
Reasoning: The greenhouse effect occurs when gases trap outgoing heat energy and re-radiate it back toward Earth.
7 / 20
During daytime, Earth receives solar energy. At night, greenhouse gases affect temperature by:
Reasoning: Greenhouse gases slow down heat loss by absorbing and re-emitting infrared radiation at night.
8 / 20
Which of the following best explains why global warming occurs due to greenhouse gases?
Reasoning: Increased greenhouse gases trap more heat, reducing energy loss and increasing average global temperature.
9 / 20
What happens when methane absorbs infrared radiation?
Reasoning: Methane re-emits absorbed infrared radiation, contributing to atmospheric warming.
10 / 20
Why is the balance between incoming solar energy and outgoing thermal energy important?
Reasoning: Earth’s temperature remains stable when incoming and outgoing energy are balanced; greenhouse gases disturb this balance.
11 / 20
Which phenomenon directly increases when greenhouse gases trap more thermal energy?
Reasoning: Trapped heat increases average atmospheric and surface temperature, causing global warming.
12 / 20
Which property of carbon dioxide makes it effective in contributing to greenhouse effect?
Reasoning: CO₂ absorbs Earth’s outgoing infrared radiation, trapping heat in the atmosphere.
13 / 20
How does methane contribute to “energy trapping” in the atmosphere?
Reasoning: Methane absorbs heat energy and re-emits it, preventing heat from escaping into space.
14 / 20
If greenhouse gases were absent, Earth’s temperature would:
Reasoning: Without greenhouse gases, Earth would lose heat rapidly and become much colder.
15 / 20
Which step is part of the greenhouse effect process?
Reasoning: Earth emits infrared radiation after absorbing solar energy, which is then trapped by greenhouse gases.
16 / 20
Why does increasing carbon dioxide concentration enhance global warming?
Reasoning: More CO₂ means more infrared absorption, leading to greater heat retention.
17 / 20
Methane contributes to global warming mainly by:
Reasoning: Methane traps infrared radiation, increasing atmospheric temperature.
18 / 20
Which statement correctly describes “re-emission of thermal energy” by greenhouse gases?
Reasoning: Absorbed infrared energy is re-emitted, some of which returns to Earth’s surface.
19 / 20
The main consequence of reduced thermal energy loss due to greenhouse gases is:
Reasoning: Less heat escaping means more heat retained, leading to global warming.
20 / 20
Which combination best explains greenhouse gas action?
Reasoning: Greenhouse gases absorb infrared radiation and re-emit it, trapping heat in the atmosphere.
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