Question

Q)Find the wrong statement among the following.•Surface tension of liquid is independent of area of surface
•Water with detergent dissolved should have small angle of contact
•Centre of a spinning cricket ball in air does not follow parabolic trajectory
•For a fluid in steady flow, increase of fluid speed at a constriction follows conservation of momentum law​

Answer 1

Wrong statements: Fluids

Explanation:

• From the given statements if we talk about statement 1, it is correct because we know that surface tension is force per unit area and force is independent of the area so is surface tension.
• Statement2 is also true since a small angle of contact represents the fast capillary rise of detergent on cloth (pores act as small capillary tubes)  which ultimately means efficient cleaning.
• Statement 3 is also correct because of the Magnus effect.
• While Statement 4 is false or wrong since it follows conservation of mass not conservation of momentum law.

Thus, the wrong statement is statement 4 - For a fluid in a steady flow, an increase of fluid speed at a constriction follows conservation of momentum law