Physics
Stars appears to move from east to west because

The background of the stars moves from west to east
The earth rotates from west to east
All stars move from east to west
The earth rotates from east to west

ANSWER DOWNLOAD EXAMIANS APP

Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.

ANSWER DOWNLOAD EXAMIANS APP