No ManchesterUnited can not win the world cup. As they are a English club, they can only win the Champion League.
They have never won a club world cup trophy.
England won the FIFA Club World Cup 2008.
Barcelona won the 2010/2011 FIFA Club World Cup.
Spain won the world cup in the year 2010.
The FA cup is a club competition. It was won by Chelsea in 1970. Brazil won the World cup in 1970.
They can't they are a club not a country. Only countries enter the world cup.
In the 2011 world cup YUVRAJ has the won the most man of the match awards. He has won 4/8 Man of the match awards.
None, yet.
Wales has never won a world cup.
The World Cup is an international event played between nations, not clubs. The equivalent for club football is the FIFA Clubs' World Cup (and before it the Intercontinental Cup), which Barcelona has won once. Real Madrid has won three.
Yes
Sachin Tendulkar (India) won the Man of the Series award in the 2003 Cricket World Cup.