Solve the Following Riddle (This is a question asked in my physics text book.)
My first is in VAN but not in PAN
My second is in EARTH and also in HEAVEN
My third is in ONE and not in TWO
My fourth is in BUN and also in FUN
My last is in STAR but not in RADAR
I am a planet that moves round the Sun.
 

Dear Student,
It is clear from the last line that it is the name of a planet.
Now, the first letter is  V (as letter V is in VAN but not in PAN)
the second letter is E( As E is in EARTH and also in HEAVEN)
the third letter is N ( As N is in ONE and not in TWO)
the fourth letter is U ( As U is in BUN and also in FUN)
the fifth letter is S (As is in STAR but not in RADAR)
Therefore Venus is the correct answer as it is the only planet which revolves around the sun.
Regards