Neglecting the density of air, the terminal velocity obtained by a raindrop of radius 0.3 mm falling through air of viscosity 1.8 10-5 Nsm-2 will be
10.9 ms-1
7.48 ms-1
3.7 ms-1
12.8 ms-1
A metallic wire of density floats horizontal in water. The maximum radius of the wire so that the wire may not sink, will be (consider surface tension of water = T);
Bernoull's principle is based on the law of conservation of
energy
mass
linear momentum
angular momentum
PQRS is a rectangular frame of copper wire shown in figure. The side RS of the frame is movable. If a soap film is formed on it then the diameter of the wire to maintain equilibrium will be (given surface tension of soap solution=0.045 N/m and density of copper = 8.96 x 103 kg/m3 ).
0.12 m
1.2 cm
1.2 mm
2.4 mm
The most characteristic property of a liquid is
elasticity
fluidity
formlessness
volume conservation
Scent sprayer is based on
Charles' law
Boyle's law
Archimedes' principle
Bernoulli's theorem
Bernoulli's equation is an example of conservation of
momentum
Extra pressure inside a soap bubble of radius (r) is proportional to
r
1 / r
r2
1 / r2
When a body falls in air, the resistance of air depends on a greater extent on the shape of the body. Three different shapes are given
Identify the combination of air resistances, which truly represents the physical situation (The cross-sectional areas are the same).
1 < 2 < 3
2 < 3 < 1
3 < 2 < 1
3 < 1 < 2
A steel ball is dropped in oil, then
the ball attains constant velocity after some time
the ball stops
the speed of ball will keep on increasing
none of the above
