question_answer

A 20 cm long capillary tube is dipped, in water. The water rises upto 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be     AIEEE  Solved  Paper-2005

A) 8cm     

B)                        10cm    

C)        4cm                       

D)        20cm

Correct Answer: D

Solution :

As lift accelerates downward, the liquid will rise under psuedo forcecontinously acting in upward directions. So, liquid will rise upto entire length of the tube.      (during free fall)