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
501
The ozone hole was first discovered over:
Answer:
Antarctica
In the 1980s, scientists observed severe ozone thinning over Antarctica. Cold stratospheric conditions worsened the effect of CFCs. This discovery led to the Montreal Protocol.
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502
Acid rain has been increasing mainly because of:
Answer:
All of the above
Burning of fossil fuels in industries and vehicles releases SO₂ and NOₓ. Urban growth amplifies this effect. All factors contribute to worsening acid rain.
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503
The main purpose of animal husbandry is:
Answer:
Production of meat, milk, and dairy
Animal husbandry ensures food products like milk, meat, and wool. It supports rural economy and livelihoods. Conservation of forests or wildlife is not its primary aim.
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504
Which statement is **not true** about animal husbandry?
Answer:
It is protection of wildlife
Animal husbandry is focused on domestic animals for food and livelihood. Wildlife conservation is a separate activity. Thus, linking it to animal husbandry is incorrect.
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505
Which of the following statements about ozone is correct?
Answer:
All of the above
Ozone plays both protective and harmful roles. In the stratosphere, it blocks UV rays. At ground level, it forms smog and irritates lungs.
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506
Freons are classified as:
Answer:
CFCs
Freons are trade names for chlorofluorocarbons (CFCs). They were used in refrigeration, aerosol sprays, and air-conditioning. Their release caused serious ozone depletion.
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507
Each chlorine radical can destroy approximately how many ozone molecules?
Answer:
hlorine radical can destroy approximately how many ozone molecules?
Chlorine radicals from CFCs act as catalysts. A single chlorine atom can break down up to 100,000 ozone molecules before being neutralized. This chain reaction makes CFCs highly destructive.
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508
Formation of the ozone layer is explained by:
Answer:
Chapman’s reaction
Sydney Chapman explained ozone formation in the stratosphere. O₂ molecules split into oxygen atoms, which then combine to form O₃. This process maintains the ozone shield.
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509
Which of the following is **not** an ill effect of acid rain?
Answer:
Causes cataracts in humans
Acid rain damages aquatic life, corrodes monuments, and removes nutrients from soil. Cataracts are linked with UV exposure, not acid rain. Hence, it is not considered an effect of acid rain.
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510
The ozone layer primarily absorbs which radiation?
Answer:
UV rays
Ozone absorbs UV-B and UV-C radiation from the Sun. This prevents harmful radiation from reaching Earth’s surface. Without it, life would face severe genetic damage.