PHYSICS 10 SCIENCE · 2026–27 · From the chapter · exam-style questions · p. 189

Original MCQ based on chapter text

At twice the Sun–planet distance, received solar flux is approximately:

سورج سے دوگنے فاصلے پر حاصل شمسی شدت تقریباً ہے:

  1. (a)

    twice

    دوگنی

  2. (b)

    half

    نصف

  3. (c)

    one quarter

    چوتھائی

  4. (d)

    four times

    چار گنا

Solution & explanation

Correct choice(s): (c)

(c) Flux follows 1/r², so replacing r with 2r gives one quarter.

Independent study material · English-medium textbook p. 189 · Original book ↗