CBSE
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
If tension of sonometer wire is made four times, then its frequency will change by a factor of
2
4
1/2
6
Rain drops are spherical in shape due to
acceleration due to gravity
downward motion
surface tension
capillary
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
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 a liquid does not wet a solid surface, then its angle ofcontact is
acute angle
obtuse angle
right angle
None of these
If there were no gravity, which of the following will not be there for a fluid ?
Viscosity
Surface tension
Pressure
Archimedes' upward thrust
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 = 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