When the temperature is increased, the angle of contact of a liquid
increases
decreases
remains the same
first increases and then decreases
A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in ms-1 ) through a small hole on the side wall of the cylinder near its bottom is
10
20
25.5
5
Motion of a liquid in a tube is best described by
Bernoulli' theorem
Poiseuille's equation
Stokes' law
Archimedes' principle
A water fountain on the ground sprinkles water all around it. If the speed of water coming out of the fountain is v, the total area around the fountain that gets wet is
A glass tube of uniform internal radius (r) has a value separating the two identical ends. Initially, the value is in a tightly closed position. End 1 has a hemispherical soap bubble of radius r. End 2 has sub-hemi-spherical soap bubbles as shown in figure. Just after opening the valve,
air from end 1 flows towards end 2. No change in the volume of the soap bubbles.
air from end 1 flows towards end 2. Volume of the soap bubbles at end 1 decreases.
no changes occur
air from end 2 flows towards end 2. Volume of the soap bubble at end 1 increases.
A capillary tube when immersed vertically in a liquid records a rise of 3.0 cm. If the tube is half immersed in the liquid at an angle of 60o with the vertical, the length of the liquid column along the tube will be :
1.5 cm
3.0 cm
6.0 cm
Drops of liquid of density are floating half immersed in a liquid of density . If the surface tension of the liquid is T, then the radius of drop will be :
A body floats in a liquid contained in a beaker. The whole system as shown in figure falls freely under gravity. The upthrust on the body is
zero
equal to the weight of the liquid displaced
equal to the weight of the body in air
equal to the weight of the immersed portion of the body.
