Palm oil from a bottle flows out more easily after it has been heated because the
Molecules do not increase speed during the heating
Viscosity of oil is reduced
Oil molecules force each other out
Adhesion between the oil molecules and those of the bottle is increased
Correct answer is B
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid.The result is that liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
Which of the following is the dimension of pressure
ML−1T−2
MLT−2
ML2T3
ML−3
Correct answer is A
Pressure = ForceArea
Pressure = m × at
= MLT−2L×L
= ML−1T−2
The friction which exist between two layers of liquid in relative motion is called
Capillary
Surface
Viscosity
Cohesion
Correct answer is C
Viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighboring portions relative to one another. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Molasses, for example, has a greater viscosity than water. Because part of a fluid that is forced to move carries along to some extent adjacent parts, viscosity may be thought of as internal friction between the molecules; such friction opposes the development of velocity differences within a fluid. Viscosity is a major factor in determining the forces that must be overcome when fluids are used in lubrication and transported in pipelines. It controls the liquid flow in such processes as spraying, injection molding, and surface coating.