Discussion
Match List I with List II and select the correct answer using the codes given below :
| List I - planets | List II - Revolution Period |
|---|---|
| (a) Mars | 1. 88 days |
| (b) Earth | 2. 225 days |
| (c) Mercury | 3. 687 days |
| (d) Venus | 4. 365 days |
Answer: B
The correct code is a-3, b-4, c-1, d-2.
- Mars: about 687 days to orbit the Sun.
- Earth: about 365 days.
- Mercury: about 88 days, the shortest year of any planet.
- Venus: about 225 days.
The periods grow with distance from the Sun (Kepler's third law), so Mercury must have the shortest and Mars the longest of these four. The code a-3, b-4, c-2, d-1 swaps Mercury and Venus, and the codes starting a-2 make Mars faster than Earth.
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