Physics MCQs

Correct answer A. 1st to 5th orbit

Correct answer D. Line spectrum

Correct answer C. Five

Correct answer C. High-energy photons

Correct answer D. Its energy levels are too close to each other

Correct answer B. 10⁻⁸ s

Correct answer C. Lyman series

Correct answer D. 1836

Correct answer B. Rayleigh

Correct answer D. C = 16fd

Correct answer B. 100 km

Correct answer D. To produce parallel beams of light

Correct answer B. Graded index fibre

Correct answer A. Fo/fe

Correct answer A. Repeaters

Correct answer A. 42°

Correct answer A. Focus

Correct answer C. -10 dioptre

Correct answer D. 4f

Correct answer C. Between the principal focus and the optical centre