Question

The distance between earth and moon is about
 $\begin{align}
  & (a)40,000km \\
 & (b)4,00,000km \\
 & (c)400km \\
 & (d)4\times {{10}^{8}}km \\
\end{align}$

Answer 1

Hint: The moon is a satellite of earth. It is the only natural satellite of earth, all the other satellites are artificial satellites.

Complete step-by-step answer:
The answer is option B , the exact distance between earth to the moon is 384,400 km. By the option, 4,00,000 km is the approximate answer to this question.
Additional information:
(1). Earth is the planet of our solar system which has many satellites.
(2). Moon is the natural satellite of the earth.
(3). In the solar system there, a total of 8 planets are present ( mercury, venus, earth, Mars, Jupiter, Saturn, Uranus, Neptune).
(4). All the planets are rotating around the sun in different orbits and the satellite of planets is also rotating around their planet.
(5). Sun is the center of all the rotating circles of the planets.
(6). All the planets are stable in their orbital because of the balancing of gravitation force and centrifugal force.
(7). The distances of all the planets from the sun is
Sun to mercury is 57.91 million km
Sun to venus is 108.2 million km
Sun to earth is 149.6 million km
Sun to mars is 227.9 million km
Sun to Jupiter is 778.5 million km
Sun to Saturn is 1.434 billion km
Sun to Uranus is 2.871 billion km
Sun to Neptune is 4.495 billion km
By the above data, we can say that mercury is the nearest planet from the sun and Neptune is the farthest planet from the sun.
(8). Mars is called the red planet of the solar system, Venus is called the brightest planet of the solar system, it is the hottest planet of the solar system, Uranus is the coldest planet of the solar system.
(9). Out of these 8 planets, 4 planets (mercury, venus, earth, mars) are called the inner planet, and the remaining 4 planets ( Jupiter, Saturn, Uranus, Neptune) are called the outer planet of the solar system.

Note: We can eliminate the option (c) 400km because this distance is very less.
We can see by the given data that the distance between the planets is a range of million and billion so the earth will be near to earth as compared to other planets so option (d) will also be eliminated.
We know that the moon is the natural satellite of the earth so it is a little farther than the artificial satellite so we can eliminate the option (a) on this guess that the satellite is set up at the distance of option(a) range.