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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
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Q. 1174
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The speed of light will be minimum while passing through :
Correct option: A
- The speed of light in a medium = c/n, where c is in vacuum and n is refractive index.
- Glass has a higher refractive index (β1.5β1.7) than air, water, or vacuum, so light slows more in glass.
- Thus v in glass < v in water < v in air < v in vacuum.
- Formula snippet: v = c/n. Higher n β lower v.
Q. 1082
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Which kind of Power accounts for the largest share of power generation in India ?
Correct option: C
- Why correct: In India, most power comes from coal-fired thermal plants that run continuously to meet base and peak demand. This makes βThermalβ the largest share of generation.
- Key concept: Electricity generation mix; base-load plants vs intermittent sources.
- Brief formula: Share (%) = (Generation from a source / Total generation) Γ 100. Thermal often highest in this ratio.
Q. 1065
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Electric appliances have star rating ( upto 5 stars) on them. More the number of stars :
1. longer is the life span of the appliance
2. more stringent is the quality checks
3. Higher is the energy efficiency of the appliance
Which of the above is / are correct ?
Correct option: B (3 only)
- Key concept: Star rating indicates energy efficiency, not appliance lifespan or quality checks.
- 3 is correct: Higher stars mean higher energy efficiency (less energy consumption for the same performance).
- 1 is incorrect: Star rating does not guarantee longer life; lifespan depends on build quality and usage.
- 2 is incorrect: Ratings reflect energy efficiency, not the stringency of quality checks.
- Tip: In exams, remember: higher stars = better energy efficiency; check labels like BEE/ENERGY STAR.
Q. 1064
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Usually OMR sheets are used in most of the competitive examinations. The full form of OMR is :
Correct answer: D β Optical Mark Recognition
- Concept: OMR uses optical sensors to detect darkened bubbles on a sheet when light reflects differently. It converts marks into data for scoring.
- Why others are wrong:
- A: Optical Mark Response is not the standard term.
- B & C: No magnetic component is involved in OMR.
- Exam tip: Fill bubbles completely and avoid stray marks to ensure accurate recognition.
Q. 1063
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Normally, the substances that fight against diseases in human body are known as :
Correct option: A
- Explanation: Antibodies are immune system proteins that recognize and neutralize pathogens, forming the bodyβs defense against diseases.
- Key concept: antigenβantibody interaction; antibodies are produced by B cells.
- Why others are incorrect: DNA/RNA are genetic material; enzymes catalyze reactions, not direct pathogen defense.
- Exam tip: remember βantibodiesβ are the specific immune proteins, not the genetic material or general catalysts.
Q. 1061
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Cobalt-60, commonly used in radiation therapy, emits :
Correct option: C
- Explanation: Cobalt-60 is a radioactive isotope that decays to emit high-energy photons called gamma rays. The key is that gamma rays are electromagnetic waves, not charged particles, produced during decay to release excess energy.
- Key concept: Radioactive decay emits different radiation types; gamma rays come from nuclear transitions after beta decay.
- Tip: In therapy and imaging, cobalt-60 is known for gamma radiation, not alpha or beta.
- Why others are incorrect: - Alpha rays: heavy, strongly charged, stopped by paper. - Beta rays: electrons/positrons, require thinner shielding like plastic. - X-rays: produced by electron interactions, not primarily from cobalt-60 decay.
Q. 1060
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Einstein received Nobel Prize for his theory of :
Correct answer: BβPhotoelectricity
- Reason: Einstein explained that light behaves as particles (photons) and can eject electrons from a material if the photon energy exceeds the work function.
- Key concept: Photoelectric Effect; relation E = hΞ½ and KE = hΞ½ β Ο, where Ο is work function.
- Why others are incorrect: A is for Relativity (not awarded the Nobel for that). C is Brownian Motion (earlier work by Einstein but not Nobel). D is false.
- Exam tip: Remember the Nobel awarded for the photoelectric effect, linking quantum theory to experiments.
Q. 1059
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The science dealing with the study of phenomena at very low temperature is known as :
Correct option: B (Cryogenics)
- Explanation: Cryogenics is the science of producing and studying temperatures well below 0Β°C, often using liquefied gases.
- Key concept: Low-temperature physics, phase changes, and properties of materials at near-absolute-zero conditions.
- Formula/numerical note: No specific formula required here; concept focuses on temperature ranges and methods to achieve them (e.g., liquefaction of gases).
- Exam tip: Remember the root "cryo" means cold; other options mimic words but are incorrect (not standard sciences).
- Why others incorrect: A: Refrigenics, C: Cytogenics, D: Frozenics are not recognized sciences for low temperatures.
Q. 1058
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The process by which energy is generated in the Sun is :
Correct option: A
- Explanation: The Sun generates energy mainly by nuclear fusion, fusing hydrogen into helium in its core.
- Key concept: Massβenergy conversion (E = mc^2). The tiny mass difference is released as huge energy due to high core temperatures and pressures.
- Formula (brief): E = Ξm c^2, where Ξm is the mass defect in fusion reactions (protonβproton chain).
- Why others are incorrect: Fission splits heavy nuclei (not primary in the Sun); burning gases is chemical, not nuclear fusion.
- Exam tip: Remember: Sun = fusion, not burning; fusion powers stars.
Q. 1057
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The number of protons in an alpha particle is :
Correct answer: B
- The number of protons in an alpha particle is 2.
- Reason: An alpha particle is the helium-4 nucleus, Z = 2 (atomic number), consisting of 2 protons and 2 neutrons. Its charge is +2e.
- Key concept: Atomic number Z equals the number of protons; alpha particle is a helium nucleus (Z = 2, A = 4).
- Tip: If asked about mass number, alpha particle has A = 4 (not needed here).
- Why others are incorrect: A, C, D would imply 1, 3, or 4 protons, which contradicts Z = 2 for helium.
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