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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.
📚 Questions: 553
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Q. 3697
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Noise levels in residential areas should not exceed:
Correct answer: D — 55 decibels
- Concept: Noise levels are measured in decibels (dB) as an average over time. For residential areas, a lower limit protects comfort and health.
- Why correct: 55 dB is a typical permissible Leq (equivalent continuous noise level) limit for day hours in residential zones.
- Formula/numerical note: Leq is the average sound energy over a period; higher peaks do not directly replace Leq limits.
- Why others are incorrect: 30 dB is too strict for daytime; 85 dB and 100 dB are far above safe residential standards.
- Exam tip: Remember 55 dB as a standard residential daytime limit for quick recalls.
Q. 3683
👁 0 views
What is the S.I. unit of electric current?
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Q. 3682
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India's first supercomputer is known as:
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Q. 3665
👁 1 views
"Athlete's foot" is:
- Correct answer: C Athlete's foot (tinea pedis) is a common fungal infection that attacks the skin between the toes and sometimes the soles. The key concept is dermatophyte fungi causing interdigital and plantar lesions.
- Why others are incorrect: A describes footwear, not a disease; B is an allergic rash; D is eczema, not a fungal infection.
- Exam tip: Remember fungal infections often affect feet in moist environments; look for itching, scaling, and redness between toes.
Q. 3664
👁 3 views
Which one is a water soluble vitamin?
Explanation
- Correct answer: B — Vitamin C is water-soluble. Water-soluble vitamins dissolve in water, travel in blood, and excess is excreted in urine.
- Key concept: Fat-soluble vitamins (A, D, E, K) are stored in body fats; water-soluble vitamins (like C) are not stored in large amounts.
- Vitamin C is essential for collagen synthesis and acts as an antioxidant.
- Tip: If a vitamin is often lost in urine after high intake, it’s likely water-soluble (e.g., Vitamin C).
- Why others are incorrect: A, C, D are fat-soluble (stored, not easily excreted); B is the only water-soluble option.
Q. 3663
👁 0 views
What makes a lemon sour?
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Q. 3662
👁 2 views
The weight of a body at the centre of the earth is:
Correct option: A - zero
- Reason: Inside a symmetrical sphere, gravitational forces from all directions cancel at the center, giving net gravity zero. Hence weight (gravitational force) is zero at the center.
- Key concept: If density is uniform, g inside varies as g = (G M r)/R^3, so at r = 0, g = 0. Weight = gravitational force on body.
- Why others are wrong: B is false (not infinite). C is false (gravity is not the same as at surface). D is false since A is correct.
- Exam tip: Remember “g inside a uniform sphere drops to zero at the center” to quickly solve similar questions.
Q. 3661
👁 1 views
The acid present in the stomach of human beings is:
The correct answer is C. HCl.
- Key concept: Stomach secretes hydrochloric acid (HCl) to create a highly acidic environment (pH ~1–2) for digestion and pathogen killing.
- Why HCl: Parietal cells secrete H+ and Cl− to form gastric acid. The formula is HCl.
- Why others are incorrect: HNO3 (nitric acid), H2SO4 (sulfuric acid) are strong mineral acids not produced in the stomach; H2CO3 (carbonic acid) is weak and mainly in blood.
Q. 3660
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Organic farming does not include:
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Q. 3659
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The stars twinkle at night because:
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