A person cannot see objects clearly beyond 2 m. This defect of vision is: MCQ with Answer and Explanation

A person cannot see objects clearly beyond 2 m. This defect of vision is:
A. Presbyopia
B. Astigmatism
C. Hypermetropia
D. Myopia
Answer: Option D
Solution (By JKExamLibrary)
Myopia (nearsightedness) is the inability to see distant objects clearly, with far point less than infinity. Here, far point is 2 m. Corrected using concave lens. Hypermetropia (farsightedness) affects near vision; presbyopia is age-related loss of accommodation; astigmatism involves uneven corneal curvature. Memory aid: 'Myopia = near-sighted; far point reduced'. This application question tests knowledge of vision defects and corrections, frequently appearing in competitive exams. Always link symptom (blurred distant vision) to defect (myopia) and correction (diverging lens).

This question belongs to: Science Physics

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Work per unit charge to move between points is:
A. Electric potential
B. Capacitance
C. Potential energy
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Correct Answer: Option A


Explanation:
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Question #2 Report Error
The magnetic field at the center of a circular coil of radius R carrying current I is:
A. μ₀NI/(4πR)
B. μ₀NI/(2R)
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Correct Answer: Option B


Explanation:
For a circular coil with N turns, magnetic field at center B = μ₀NI/(2R). For single turn (N=1), B = μ₀I/(2R). This derives from Biot-Savart law. Option A is for single turn; B and D have incorrect constants. Memory tip: 'Coil center: B = μ₀NI/(2R); straight wire: B = μ₀I/(2πr)'. This formula application is frequently tested in magnetism sections of competitive exams. Always note number of turns N; competitive exams often include it to test attention to detail.

This question belongs to: Science Physics
Question #3 Report Error
Which of the following statements is correct for an object moving with constant speed?
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Correct Answer: Option B


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This question belongs to: Science Physics