Concave mirror forms real image when object is placed: MCQ with Answer and Explanation

Concave mirror forms real image when object is placed:

A. At pole

B. At focus

C. Between pole and focus

D. Beyond focus

Answer: Option D

Solution (By JKExamLibrary)

Concave mirror: real, inverted image forms when object beyond focal point (u > f). Between pole and focus: virtual, erect image. At focus: image at infinity. Memory aid: 'Concave: object beyond F ⇒ real image; within F ⇒ virtual'. Ray optics concept frequently tested to verify mirror image formation understanding in competitive exams.

This question belongs to: Science Physics

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Specific heat capacity of water is 4200 J/kg°C. How much heat is required to raise temperature of 2 kg water by 10°C?

A. 4200 J

B. 8400 J

C. 84000 J

D. 42000 J

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Correct Answer: Option C

Explanation:
Q = mcΔθ = 2 × 4200 × 10 = 84,000 J = 84 kJ. Large specific heat of water makes it useful for cooling and climate moderation. Always check units: mass kg, c J/kg°C, ΔT °C.

This question belongs to: Science Physics

Question #2 Report Error

A car travels 30 m in 2 s with uniform acceleration starting from rest. Acceleration is

A. 7.5 m/s²

B. 15 m/s²

C. 3.75 m/s²

D. 30 m/s²

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Correct Answer: Option B

Explanation:
s = ½ a t² => 30 = ½ a (4) => a = 15 m/s².

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Question #3 Report Error

Solar cell converts:

A. Mechanical to electricity

B. Light to electricity

C. Heat to electricity

D. Chemical to electricity

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Correct Answer: Option B

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Photovoltaic effect: photons excite electrons in semiconductor, creating voltage. Direct light-to-electricity conversion. Memory tip: 'Photo = light; voltaic = electricity'. Renewable energy principle frequently tested in competitive exams to assess energy conversion understanding.

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