In an examination Raj got more marks than Moti but not as many as Meena. Meena got more marks than Ganesh and Rupali. Ganesh got less marks than Moti but his marks are not the lowest in the group. Who is second in the descending order of marks?

Let's decipher the clues to arrange them in descending order (highest to lowest):
1. Raj got more marks than Moti but less than Meena: $\text{Meena}>\text{Raj}>\text{Moti}$.
2. Meena got more marks than Ganesh and Rupali: $\text{Meena}>\text{Ganesh}$ and $\text{Meena}>\text{Rupali}$.
3. Ganesh got less marks than Moti: $\text{Moti}>\text{Ganesh}$.
4. Ganesh's marks are not the lowest, meaning someone is below Ganesh. Since we know $\text{Meena}>\text{Raj}>\text{Moti}>\text{Ganesh}$, the only person left to be at the bottom is Rupali: $\text{Ganesh}>\text{Rupali}$.

Combining these relations, the clear sequence from highest to lowest is:

$$\text{Meena}>\text{Raj}>\text{Moti}>\text{Ganesh}>\text{Rupali}$$

In this descending order, Raj is second.