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