Mechanical Properties of Fluids

Compressibility of water is 5 x 10^-10 m² /N. The change in volume of 100 mL water subjected to 15 x 10⁶ Pa pressure will

• no change

• increase by 0.98 mL

• decrease by 0.75 mL

• increase by 1.50 mL

If there were no gravity, which of the following will not be there for a fluid ?

• Viscosity

• Surface tension

• Pressure

• Archimedes' upward thrust

If a liquid does not wet a solid surface, then its angle ofcontact is

• acute angle

• obtuse angle

• right angle

• None of these

If tension of sonometer wire is made four times, then its frequency will change by a factor of

• 2

• 4

• 1/2

• 6

Dancing of small pieces of camphor on the surface of water is due to

• viscosity

• surface tension

• weight

• lifting force

A ballon contains 500 m³ of He at 27°C and 1 atmospheric pressure. The volume of He at − 3°C and 0.5 atmospheric pressure will be

• 700 m³

• 900 m³

• 1000 m³

• 500 m³

The Reynolds number of a flow is the ratio of

• gravity to viscous force

• gravity force to pressure force

• inertia force to viscous force

• viscous forces to pressure force

Rain drops are spherical in shape due to

• acceleration due to gravity

• downward motion

• surface tension

• capillary

Rain drops are spherical in shape, because of

• surface tension

• capillarity

• downward motion

• acceleration due to gravity

If a liquid is flowing through a horizontal tube, then $\mathrm{p} + \frac{1}{2}{\mathrm{\rho V}}^2$= constant. This shows that

• If p increases then V also increases

• p and V both are constant

• If p increases then V decreases

• If p decreases then V also decreases