WorksheetsClass Test - PHP I
Total questions: 12
Worksheet time: 8mins
Name
Class
Date
1.
Dancing of piece of camphor in water is due to
a)
Viscosity
b)
Surface tension
c)
Weight
d)
Gravitational force
2.
Addition of common salt to water will …………. the surfac tension
a)
Decreases
b)
Increases
c)
Remains same
d)
None
3.
Surface tension of the liquid can be reduced by
a)
decreasing the temperature
b)
Adding salt
c)
Adding detergents
d)
All the above
4.
Which of the following is a necessary condition for capillary action to take place in a narrow tube
a)
Adhesive forces must be greater than the cohesive forces
b)
Fluid pressure must be zero
c)
Surface must have a thin membrane
d)
None of the above
5.
The apparatus used for the determination of surface tension of a liquid is
4 lines
6.
When there are no external forces, the shape of a liquid drop is determined by
a)
Density of liquid
b)
Viscosity of liquid
c)
Temperature of air onl
d)
Surface tension of the liquid
7.
Choose the wrong statement from the following.
a)
Small droplets of a liquid are spherical due to surface tension
b)
Oil rises through the wick due to capillarity
c)
In drinking the cold drinks through a straw, we use the phenomenon of capillarity
d)
Gum is used to stick two surfaces. In this process we use the property of Adhesion
8.
Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75 × 10-4 N, forces due to the weight of the liquid. If the surface tension of water is 6 × 10-2 N/m, the inner-circumference of the capillary must be
a)
1.25 × 10-2 m
b)
0.50 × 10-2 m
c)
6.5 × 10-2 m
d)
12.5 × 10-2 m
9.
Water drops merge to form a single drop. In this process________
a)
energy is absorbed
b)
energy is liberated
c)
energy is neither absorbed nor liberated
d)
otal surface area increases
10.
The surface tension of water at 250C is __________
4 lines
11.
In case of water and glass, we get a concave meniscus because the adhesive force between water and glass are _______________ than the cohesive forces between water molecules.
a)
Weaker
b)
Stronger
c)
Same
d)
None
12.
Surface tension is due to
a)
Cohesive molecular forces
b)
Nuclear forces
c)
Gravitational forces
d)
All the above
100 %
