Questions
An iron needle slowly placed on the surface of water floats on it because
a
when inside in water it will displace water more than its weight
b
the density of the material of needle is less than that of water
c
of surface tension
d
of its shape
detailed solution
Correct option is C
Due to the concave shape of the surface film, total surface tension force on the needle = sl+sl =2sl. Also water displaced by the needle produces a buoyant force B on the needle. Resultant of buoyant force and surface tension force, balances the weight of the needle. Since buoyant force B is very small, weight of the needle is balanced chiefly by surface tension force.Talk to our academic expert!
Similar Questions
Assertion : Surface tension decreases with increase in temperature.
Reason : On increasing temperature kinetic energy increases and inermolecular forces decreases.
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
free study material
JEE
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests
Popular Books
HC Verma Part 1HC Verma Part 2RS AgarwalRD SharmaLakhmir SinghDK GoelSandeep GargTS GrewalNCERT solutions
Class 12 NCERT SolutionsClass 11 NCERT SolutionsClass 10 NCERT SolutionsClass 9 NCERT SolutionsClass 8 NCERT SolutionsClass 7 NCERT SolutionsClass 6 NCERT Solutions
