Question

Direction - For the below Assertion [As] and Reason [R], choose the correct alternative-
Assertion [As] : Moon cannot be used as a satellite for communication.
Reason [R] : Moon does not move in the equatorial plane of the earth.

• A. Both [As] and [R] are true, and [R] is the correct explanation of [As].
• B. Both [As] and [R] are true, but [R] is not the correct explanation of [As].
• C. [As] is true, but [R] is false.
• D. [As] is false, but [R] is true.

Hint:

A communication satellite must have a stationary footprint over the Earth's surface. Since any orbit outside the equatorial plane has a changing latitude relative to ground stations, the Moon's nonequatorial path makes it structurally impossible to use as a passive continuous communication satellite.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
We need to evaluate the scientific validity of the given Assertion [As] and Reason [R] regarding the suitability of the Moon as a communication satellite.

Step 2: Detailed Explanation:
- Let us evaluate the Assertion [As]: "Moon cannot be used as a satellite for communication." This statement is true. For continuous, reliable global communication, satellites must be geostationary (remaining fixed over a single spot on Earth). The Moon's orbital period is \( 27.3 \) days, which does not match the Earth's daily rotation of 24 hours. Hence, it cannot act as a geostationary communication satellite.
- Let us evaluate the Reason [R]: "Moon does not move in the equatorial plane of the earth." This statement is also true. The Moon's orbit is inclined at an angle of approximately \( 5.1^\circ \) to the ecliptic plane, meaning it does not lie in the Earth's equatorial plane.
- Now let us check for a causal connection:
To be a geostationary satellite, a body must satisfy three main criteria:
1. It must have an orbital period of exactly 24 hours.
2. It must rotate in the same direction as Earth.
3. Its orbit must lie in the equatorial plane of the Earth.
Since the Moon does not move in the equatorial plane of the Earth, it fails one of the fundamental criteria required to be a geostationary communication satellite. Thus, the Reason is a correct explanation for why the Moon cannot be used for satellite communication.

Step 3: Final Answer:
(A) Both [As] and [R] are true, and [R] is the correct explanation of [As].