If there were no gravity, which of the following will not be there for a fluid ?
Viscosity
Surface tension
Pressure
Archimedes' upward thrust
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 liquid X of density 3.36 g/cm3 is poured in the right arm of a U-tube, which contains Hg. Another liquid Y is poured in left arm with height 8 cm, upper levels of X and Y are same. What is density of Y ?
0.8 g/cm3
1.2 g/cm3
1.4 g/cm3
1.6 g/cm3
A jar is filled with two non-mixing liquids 1 and 2 having densities ρ1 and ρ2 respectively.
A solid ball, made of a material of density ρ3 , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for ρ1 and ρ2 and ρ3 ?
ρ1 < ρ3 < ρ2
ρ3 < ρ1 < ρ2
ρ1 > ρ3 > ρ2
ρ1 < ρ2 < ρ3
The water droplets in free fall are spherical due to
gravity
viscosity
surface tension
intermolecular attraction
If a mercury drop is divided into 8 equal parts, its total energy,
remains same
becomes twice
becomes half
becomes 4 times
Work done to blow a bubble of volume V is W. The work done in blowing a bubble of volume 2V will be :
21/3 W
2W
41/3 W
4W
A rectangular vessel when full of water, takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water ?
9 min
7 min
5 min
3 min
By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of mercury (density = 13.6 g cm-3). Using the straw, he can drink water from a glass upto a maximum depth of
10 cm
75 cm
13.6 cm
1.36 cm
