Rohit took a burning candle and covered it with a
glass chimney as shown in figure I. He took another
burning candle and slid a thin tin plate with a hole in
the middle just below the flame and above the melted
wax as shown in figure II. Then, he took the third
candle and covered it with a glass chimney which
was kept on the wooden blocks as shown in figure III.
Which of the following observations is correct?
A Smoke is produced in candle III due to less supply
of air.
B Candles I and III burn freely.
C Tin plate conducts more heat towards the wick and
hence, candle II becomes brighter.
D The flame flickers and produces smoke in candle I.