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
321
Biogas is produced by:
Answer:
iogas is produced by:
Anaerobic bacteria break down organic waste such as dung and kitchen scraps to produce methane-rich biogas. This renewable energy source is used for cooking and electricity.
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322
The most important fuel used in nuclear power plants is:
Answer:
U-235
Uranium-235 is fissile and sustains chain reactions, making it the primary fuel for nuclear reactors. U-238 is more abundant but not directly fissile. It can be converted into plutonium-239.
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323
A major hazard of nuclear power plants is:
Answer:
All of the above
Nuclear power poses multiple risks—long-lived radioactive waste, accident potential, and contamination during transport and processing. Strict safety protocols are needed to minimize these risks.
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324
Reduction in fuel use cannot be achieved by:
Answer:
Reducing car taxes
Cutting car taxes encourages more vehicle ownership and fuel use. Switching to cleaner fuels and lifestyle changes (e.g., public transit) directly reduce fuel consumption. Thus, tax reduction does the opposite.
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325
Solar radiation consists of:
Answer:
All of the above
Sunlight contains ultraviolet, visible, and infrared wavelengths. UV drives vitamin D synthesis but can harm DNA, visible light drives photosynthesis, and infrared provides heat. All three together form solar radiation.
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326
Which of the following is considered an alternate fuel?
Answer:
onsidered an alternate fuel?
CNG burns cleaner than petrol, diesel, or coal, emitting fewer particulates and greenhouse gases. It is widely used as an alternative fuel in vehicles. Petrol and coal are conventional, not alternate, fuels.
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327
Which are referred to as the "Earth’s lungs"?
Answer:
re referred to as the "Earth’s lungs"?
Forests produce oxygen through photosynthesis and regulate atmospheric gases. The Amazon rainforest is often called the "lungs of the Earth." Forest loss weakens this global life-support system.
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328
Forest-rich areas in Karnataka are mainly found in:
Answer:
reas in Karnataka are mainly found in:
The Western Ghats are biodiversity hotspots with dense tropical forests. They house reserves like Bandipur and Nagarhole. Mangalore is a coastal city, not a forest zone.
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329
Livestock wastes release large amounts of which compound into the environment?
Answer:
Nitrogen compounds
Animal wastes contain ammonia and organic nitrogen that decompose into nitrates. These contribute to eutrophication when washed into water bodies. Managing livestock waste is key to reducing agricultural pollution.
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330
Sulphur occurs in soils and rocks mainly as:
Answer:
nd rocks mainly as:
Sulphur is commonly present as metal sulphides (like pyrite, FeS₂) and sulphates (like gypsum). These compounds enter biogeochemical cycles through weathering. Plants take up sulphur primarily as sulphate.
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