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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. 1977
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Opium is derived from which part of poppy plant ?
Correct answer: D. Capsule
- Opium is the latex collected from the unripe seed capsules of Papaver somniferum, not from seeds or leaves.
- Key concept: alkaloids (morphine, codeine) are present in latex exuded from the capsule walls.
- Why others are incorrect: seeds contain oils, leaves contain little latex, and bark is from other trees; only the unripe capsule yields opium.
- Exam tip: remember “opium = latex from unripe poppy capsule.”
Q. 1976
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Which of the following is not a viral
disease ?
Answer: A. Tuberculosis
- Why correct: Tuberculosis is caused by a bacterium (Mycobacterium tuberculosis), not a virus.
- Key concept: Viral diseases are caused by viruses; bacterial diseases by bacteria.
- Other options:
- Polio — viral (poliovirus).
- Swine flu — viral (influenza A).
- Hepatitis — can be viral (A, B, C) or non-viral in some cases, but commonly discussed as viral in exams.
- Exam tip: Remember “TB = bacterium”; viruses cause diseases like polio, flu, hepatitis.
Q. 1975
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Which of the following cells produce immune response in human body ?
Correct option: B
- Why: White blood cells (leukocytes) are the primary cells of the immune system that recognize and attack pathogens.
- Key concept: Immune response is carried out by leukocytes (e.g., neutrophils, lymphocytes, macrophages).
- Other options:
- A) Red blood cells transport oxygen, not immunity.
- C) Epithelical/epithelial cells form barriers, not active immune cells.
- D) Adipose cells store fat and have other roles, not direct immune response.
- Exam tip: Remember “WBC = white blood cells = immune defense.”
Q. 1974
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Which of the following is not a renewable source of energy ?
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Q. 1973
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Magnification produced by a rear view mirror fitted in vehicles:
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Q. 1972
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Which of the following is not a property of acids ?
Correct answer: D
- A Sour taste is a property of acids (e.g., citric acid in lemons).
- B Acids are typically corrosive.
- C For acidic solutions, pH < 7 (pH = 7 is neutral).
- D Acids turn red litmus to blue — this is false; acids turn blue litmus to red. Bases do the opposite.
Q. 1971
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Which of the following cell organelles is referred to as the 'suicidal bags' or
'disposal units' ?
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Q. 1970
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Boiling point of water inside a sealed pressure cooker is:
Answer: B
- Concept: Boiling point rises with external pressure. In a sealed pressure cooker, pressure increases, so water boils at a higher temperature.
- Reason: At about 2 atmospheres (200 kPa) the boiling point is ≈121°C, higher than 100°C at 1 atm.
- Why others are wrong: 100°C is at 1 atm; 95°C and 0°C do not correspond to typical sealed-cooker conditions.
- Exam tip: Remember: higher internal pressure → higher boiling point.
Q. 1969
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ELISA stands for:
Answer: A
- Correct concept: ELISA stands for Enzyme-linked immunosorbent assay. It uses an enzyme-labeled antibody or antigen and a color change read by spectrophotometry to detect a target molecule.
- Why others are wrong:
- B: “Epithelium lesions in surface analysis” is not a test.
- C: “Energy-linked immunity assay” is incorrect terminology.
- D: “Enzyme-linked immunity analysis” is not the standard name.
- Key concept: Enzyme-substrate color reaction converts to a measurable signal (absorbance).
- Exam tip: Remember common acronym: ELISA = Enzyme-Linked Immunosorbent Assay; often used for antibody/antigen detection.
Q. 1968
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Which of the following statements is
correct ?
Correct option: C
- Why: Electrons are negatively charged and occupy orbits around the nucleus, not inside it. The nucleus contains protons (positive) and neutrons (neutral). The atomic mass is mainly in the nucleus.
- Key concept: Atomic structure—negative electron cloud surrounds a dense positively charged nucleus.
- Compact formula: Electron charge ≈ -1.6 × 10^-19 C; mass negligible compared to nucleus.
- Why other options are wrong: A wrongly states protons are negative; B wrongly places protons/positively charged electrons in nucleus; D wrongly says entire mass is in orbits.
- Exam tip: Remember: nucleus = protons + neutrons; electrons in orbits around it.
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