JEE Main & Advanced
Physics
Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन
JEE PYQ-Fluid Mechanics, Surface Tension and Viscosity
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 2005]
A) 8cm
B) 10cm
C) 4cm
D) 20cm
Correct Answer:
D
Solution :
[d] As lift accelerates downward, the liquid will rise under psuedo forcecontinuously acting in upward directions. So, liquid will rise upto entire length of the tube.