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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. 1997
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What is Bryolory?
Bryology is the study of mosses and liverworts (non-vascular plants).
- Key concept: Bryology focuses on classification, life cycle (gametophyte-dominant), and ecology of bryophytes.
- Why option C is correct: It directly defines bryology.
Q. 1996
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Which of the following is a large blood vessel
that carries blood away from the heart ?
Correct answer: B. Artery
- Key concept: arteries are large blood vessels that carry blood away from the heart to tissues.
- Reason: They have thick, elastic walls to withstand high pressure from the heartbeat.
- Incorrect options: Vein carry blood to the heart; Capillary are small vessels exchanging substances; Nerve does not carry blood.
- Exam tip: Remember "A" for Artery and Away from the heart.
Q. 1995
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Which of the following is not a member of
vitamin B Complex ?
- Correct answer: D — Ascorbic acid is vitamin C, not a member of the vitamin B complex.
- Key concept: Vitamin B complex includes thiamine (B1), riboflavin (B2), and folic acid (B9). They are all B vitamins, unlike ascorbic acid.
- Reason: B vitamins share roles in metabolism; vitamin C has distinct roles (antioxidant, collagen synthesis).
- Exam tip: If a vitamin name ends with -in or is known as B vitamins (B1, B2, B9), it is usually in B complex; vitamin C is not.
Q. 1994
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The HIV virus affects the:
Explanation
- Correct option: B — HIV primarily targets lymphocytes, specifically CD4+ T helper cells, a type of white blood cell.
- Key concept: HIV cripples the immune system by reducing CD4+ T cells, weakening cell-mediated immunity.
- Why others are incorrect:
- A. Leucocytes — too broad; HIV mainly harms a subset (lymphocytes).
- C. Erythrocytes — red blood cells; not targeted by HIV.
- D. None of these — incorrect since lymphocytes are affected.
- Exam tip: Remember “HIV → CD4+ T lymphocytes” to quickly recall the correct option.
Q. 1993
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Liquid natural gas (LNG) predominantly contains
_______ in liquid form.
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Q. 1992
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What is reason for using red light as a stop
signal ?
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Q. 1991
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Which of the following is not correctly matched ?
Correct answer: C
- Reason: Louis Pasteur is known for pasteurization and vaccines, not blood groups. Blood groups were discovered by Karl Landsteiner.
- Other matches: Becquerel — radioactivity; Alexander Fleming — penicillin; William Harvey — described blood circulation.
- Key concept: historical associations of scientists with discoveries; avoid mixing names with wrong fields.
- Exam tip: remember the famous scientist–discovery pairs (Landsteiner → blood groups).
Q. 1990
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All ships have sonar system. It is used to detect
/measure :
- Correct answer: D — Depth of ocean
- Concept — Sonar uses echolocation: emit sound, measure time (t) for echo, depth = (speed of sound in water) × t / 2.
- Typical value — Speed of sound in seawater ≈ 1500 m/s (varies with temp/salinity).
- Why others are wrong — A measures distance to shore, not depth; B and C relate to surface or animal sounds, not bottom mapping.
- Exam tip — Remember formula: Depth = v × t / 2; convert units if needed.
Q. 1989
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Which of the following is not correct ?
(a) Exercise does not help in managing psychological discomfort.
(b) Exercise increases cardio-respiratory fitness.
(c) Exercise reduces risk of diabetes.
(d) Exercise helps in managing bone health.
(a) Exercise does not help in managing psychological discomfort.
(b) Exercise increases cardio-respiratory fitness.
(c) Exercise reduces risk of diabetes.
(d) Exercise helps in managing bone health.
Correct option: A
- Why A is not correct: Regular exercise actually helps manage psychological discomfort by releasing endorphins and reducing stress hormones (e.g., cortisol). It improves mood and mental health.
Q. 1988
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The rusting of the iron is the example of:
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