The defect of vision in which the lens becomes opaque is called MCQ with Answer and Explanation

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The defect of vision in which the lens becomes opaque is called

A. Hypermetropia

B. Astigmatism

C. Cataract

D. Myopia

Answer: Option C

Solution (By JKExamLibrary)

Cataract: clouding of lens, treated by surgery.

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Question #1

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A piece of ice of density 0.9 g/cm³ floats in water. Fraction of volume above water is

A. 0.5

B. 0.1

C. 0.2

D. 0.9

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Correct Answer: Option B

Explanation:
Submerged fraction = ρ_ice/ρ_water = 0.9, above = 0.1 (10%).

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Question #2

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The principle of AC generator is

A. Mutual induction

B. Electromagnetic induction

C. Thermoelectric effect

D. Self induction

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Correct Answer: Option B

Explanation:
Changing flux induces emf.

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Question #3

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Geostationary satellite period:

A. 12 hours

B. Variable

C. 84 minutes

D. 24 hours

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Correct Answer: Option D

Explanation:
Geostationary: orbit period = Earth's rotation period (24 h), equatorial plane, appears fixed. Orbital radius ≈ 42,000 km from Earth center. Memory tip: 'Geostationary: T=24h, equatorial, fixed position; communication satellites'. Orbital mechanics fact frequently tested in competitive exams.

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