Scattering of Light

Q. Question 10
Why do stars twinkle?

Q. Question 12
Why does the Sun appear reddish early in the morning?

Q. A linear equation in two variables ___.

1. has no solution
2. has one solution
3. has two solutions
4. has infinitely many solutions

Q. As there is no atmosphere on the moon, stars do not appear to twinkle when seen from there.

1. False
2. True

Q. Which of the following metal has the least reactivity?

1. Zinc
2. Copper
3. Iron
4. Aluminium

Q. Had the atmosphere not been present, what would be the appearance of sky? [2 MARKS]