61.
For a water does not wet a glass rod, the angle of contact is
A
Obtuse
B
Acute
C
0 degree
D
90 degree
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For a water does not wet a glass rod, the angle of contact is
Obtuse
Acute
0 degree
90 degree
For a liquid which is rising in a capillary, he angle of contact is
Obtuse
Acute
180 degree
90 degree
Excess pressure inside a bubble of radius r and of a liquid of surface tension T is
T/r
2T/r
3T/r
4T/r
By which phenomenon does the water rise from roots to leaves of plants
Capillary action
Surface Tension
Bernoullis Theorem
Viscosity
A liquid does not wet the surface of a solid if the angle of contact is
Zero
An acute one
45 degree
An obtuse one
Why does static electricity move from you to a metal object after you have walked over new carpet?
It is attracted to the metal.
It is attracted to you.
It is attracted to the carpet
It is made in your shoes.
Which type of electricity moves along a pathway to turn on a light?
static electricity
lightning energy
turbine electricity
current electricity
Which material acts as a conductor of electricity?
popsicle stick
rubber glove
plastic button
paper clip
Which form of electric discharge appears in nature?
rain
ocean currents
lightning
volcanoes
What will happen if you add more batteries to an electrical circuit containing light bulbs?
There is no change.
The bulbs will dim.
The bulbs will be brighter.
The bulbs will last longer.
What type of charge does the material losing electrons have?
Negative
Positive
Both positive and negative
No charge
What type of charge does the material gaining electrons have?
Negative
Positive
Both positive and negative
No charge
What is rubbed off one material and onto the other?
Electrons
Dirt
Neutrons
Protons
Two objects have collected static electricity with the same charge. What would the objects do when placed near each other?
repel
attract
nothing
stick together
If two charged materials are brought close together, what do they exert on each other?
Heat
A force
Ultra sonic waves
Radio waves
How can you tell when static electricity has been discharged?
Heat is released that can be felt.
Light is released and you can feel a shock.
Static electricity gives off many different colors
The object begins to spin rapidly when it is shocked.
A positively charged rod is brought near a charged electroscope. As a result of doing this, the electroscope leaves move further apart. What is the charge on the electroscope?
Positive
Negative
It is neutral
It depends on the distance between the electroscope and the rod
A positively charged rod is brought near a charged electroscope. As a result of doing this, the electroscope leaves move closer to each other. What is the charge on the electroscope?
Positive
Negative
It is neutral
It depends on the distance between the electroscope and the rod
A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur?
It acquires a positive charge but greater in magnitude than the rod
It acquires a negative charge but greater in magnitude than the rod
It acquires a negative charge but less in magnitude than the rod
It acquires a positive charge with the same magnitude as the rod
A negatively charged rod is brought near a charged electroscope. As a result of doing this, the electroscope leaves move further apart. What is the charge on the electroscope?
Positive
Negative
It is neutral
It depends on the distance between the electroscope and the rod