Wo planets with the same diameter are close to each other, as shown. One planet has
twice the mass as the other planet.
B с
D
m
1. A and B; D
2m
2. C; A
At which locations would both planets
gravitational force pull on you in the same
direction? From among these four locations,
where would you stand so that the force of
gravity on you is a maximum; i. e., at which
point would you weigh the most?
3. B and C; C
4. A and D; D
5. None of these
6. B and C;D
7. D:D
8. A and D: A
9. B: D

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.