The scientist who proposed the electromagnetic theory of light was MCQ with Answer and Explanation

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The scientist who proposed the electromagnetic theory of light was

A. Huygens

B. Einstein

C. Newton

D. Maxwell

Answer: Option D

Solution (By JKSSB Mock Tests)

Maxwell's equations predicted EM waves, light is EM.

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Question #1

Photoelectric emission requires:

A. Any frequency with high intensity

B. Frequency > threshold

C. Long wavelength

D. High intensity

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Correct Answer: Option B

Explanation:
Emission requires photon energy hν ≥ work function φ ⇒ ν ≥ ν₀. Intensity affects electron count, not emission possibility. Memory aid: 'Photoelectric: frequency threshold (quantum); intensity affects current'. Quantum physics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2

The force acting on a particle of mass 1 kg moving in a circle of radius 0.5 m with speed 2 m/s is

A. 4 N

B. 8 N

C. 1 N

D. 2 N

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Correct Answer: Option B

Explanation:
Centripetal force = m v²/r = 1×4/0.5 = 8 N.

This question belongs to: Science Physics

Question #3

Lens power P = -4 D. Focal length and type:

A. 40 cm, convex

B. 25 cm, concave

C. 40 cm, concave

D. 25 cm, convex

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Correct Answer: Option B

Explanation:
P = 1/f(m) ⇒ f = 1/P = 1/(-4) = -0.25 m = -25 cm. Negative focal length indicates diverging (concave) lens. Memory aid: 'Negative power = concave lens; f(cm) = 100/P(D)'. Direct lens power application frequently tested in competitive exams with sign convention awareness.

This question belongs to: Science Physics

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