The question was not popular among the candidates and the few candidates who answered the question performed below expectation as some of them listed the characteristics of the upper course of a river rather than the landforms of the upper course of the river which include:
-gorge/canyon
-V-shaped valley
-interlocking spur
-cliff
-steep slopes
-highland
-hanging valley
The difference between alluvial fan and a delta are:
-alluvial fans are found mostly in arid regions whereas deltas are found both in semi arid    and non-arid regions.
-deltas are found where rivers enter the sea or lake whereas alluvial fans are found where rivers emerge from a canyon onto lowlands
-alluvial fans are found within continents whereas deltas are found in coastal areas
-deltas contain water most of the time whereas alluvial fans are often dry
-alluvial fans are found at the foot of highlands whereas deltas are formed at the mouth of rivers
-deltas are relatively flat while alluvial fans are steep in cross profile
-deltas may have swamps, lakes or lagoons while alluvial fans have none of these
-sediments of alluvial fans are usually more coarse while sediments of deltas are less   coarse, fine silt or clay
-deltas have distributaries whereas alluvial fans have dry rill channels.
-deltas are formed in lower courses of rivers whereas alluvial fans could be formed   outside lower courses of rivers
-alluvial fans are formed mostly by flash floods whereas deltas are formed by rivers.
-formation of alluvial fans is more rapid and in occasional bursts whereas that of delta is   gradual and continuous.
-deltas are larger than alluvial fans
The Similarities between alluvial fan and delta are:
-both are depositional features
-deposits by water action
-composed of alluvium
-materials are sorted according to size and weight
-found on lowlands
-both are built by heavily laden streams/rivers
-both are formed when there is abrupt loss of stream energy to transport materials
-both are fan shaped