General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
41
Which agreement aims to protect the ozone layer?
Answer:
greement aims to protect the ozone layer?
The 1987 Montreal Protocol phased out CFCs. It is considered a successful environmental treaty. Ozone recovery is now underway.
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42
Which gas absorbs harmful ultraviolet radiation?
Answer:
bsorbs harmful ultraviolet radiation?
Ozone blocks most incoming UV-B radiation. This prevents skin cancer and cataracts. It is concentrated in the ozone layer.
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43
The main cause of ozone depletion is:
Answer:
Chlorofluorocarbons (CFCs)
CFCs break down ozone molecules. They release chlorine radicals in the stratosphere. This weakens UV protection.
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44
Which of the following is NOT a greenhouse gas?
Answer:
Oxygen
Oxygen is abundant but not a greenhouse gas. CO₂, CH₄, and N₂O are major contributors. These gases absorb infrared radiation.
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45
The greenhouse effect is defined as:
Answer:
Trapping of heat by greenhouse gases
Greenhouse gases let sunlight in but trap heat. This warms Earth’s surface. Without it, Earth would be much colder.
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46
The lowest recorded Earth temperature was in:
Answer:
Antarctica
Antarctica holds the record of -89°C. Its extreme cold is due to high latitude and altitude. It is Earth’s coldest continent.
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### Global Warming, Greenhouse Effect, Ozone
47
Rain shadow effect occurs:
Answer:
On leeward side of mountains
Moist winds lose water on the windward side. The opposite slope receives little rainfall. This creates dry zones.
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48
Winds near the equator that blow east to west are called:
Answer:
low east to west are called:
Trade winds occur between 0° and 30° latitude. They influenced early sea trade routes. They are steady and reliable.
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49
The major cause of climate change today is:
Answer:
Increased greenhouse gases
Human activity releases CO₂, methane, and nitrous oxide. These gases trap heat in the atmosphere. This leads to global warming.
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50
Ozone concentration is highest in which layer?
Answer:
oncentration is highest in which layer?
The ozone layer lies in the stratosphere. It absorbs harmful UV radiation. Its depletion increases health risks.
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