Statement I: If an earth satellite moves to a lower orbit, there is some dissipation of energy but the satellite speed increases.
Statement II: The speed of satellite is a constant quantity.

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If both statement I and statement II are true and statement II is the correct explanation of statement I.

If both statement I and statement II are true but statement II is not the correct explanation of statement I.

If statement I is true but statement II is false

If both statement I and statement II are false

answer is C.

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Detailed Solution

Due to resistance force of atmosphere, the satellite revolving around the earth losses kinetic energy. Therefore in a particular orbit the gravitational attraction of earth on satellite becomes greater than that required for circular orbit there. Therefore satellite moves down
to a lower orbit. In the lower orbit as the potential energy (U = - $\frac{GMm}{r}$ ) becomes more negative,
Hence kinetic energy ( $E_{k} = \frac{GMm}{2 r}$ ) increases, and hence speed of satellite increases.