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WorksheetsCONCEPTUAL SUMMATIVE ASSESSMENT 3.1
Total questions: 20
Worksheet time: 20mins
What happens if Jane rubs a piece of fur on a hard rubber rod, giving the rod a negative charge?
The fur is left neutral.
Electrons are added to the rod.
The fur is also charged negatively.
Protons are removed from the rod.
When two different materials touch each other directly, some of the electrons in one material is transferred into the other material, this effect can be increased by rubbing the two surfaces together. What charging process is involved?
conduction
earthing
friction
induction
Which activity does not produce the same results as the other three?
walking across a woolen carpet
brushing dry hair with a plastic comb
sliding over a plastic-covers automobile seat
scraping food from a metal bowl with a metal spoon
Which of the following describes on the two objects that are charge by rubbing them together?
Neither may be a conductor.
They must be made of different materials.
hey will sometimes end up with both being positively charged.
The heat produced by friction is a necessary part of this process.
If body X, with a positive charge, is used to charge body Y by induction, what will be the nature of the charge left on the latter?
must be positive
must be negative
must be equal in magnitude to that on X
must be greater in magnitude than that on X
You wish to use a positively charged rod to charge a ball by induction. Which statement is TRUE?
The ball must be a conductor.
The charge on the ball will be positive.
The ball is charged as the area of contact between the two increases.
The ball must be an insulator that is connected temporarily to the ground.
Rubber is a non-conducting material that is why it cannot easily conduct heat and electricity. Which is the best explanation for this kind of material?
It has no electrons.
It has few electrons.
It has excess electrons which are loosely bounded with its nuclei so it can free to move.
It has deficiency in electrons which are tightly bounded with its nuclei so it cannot move freely.
How can a charged object attract an uncharged object made of non-conducting material?
Attraction of an insulator is not possible.
The uncharged object must somehow gain a like charge.
The charges in the uncharged object can become polarized.
The uncharged object must somehow gain an unlike charge.
When you rub a plastic rod against your skin, electrons will likely move ____________________.
from the rod to your skin
from your skin to the rod
simultaneously to your skin and the rod
cannot be determined
An uncharged conductor is supported by an insulating stand. I pass a positively charged rod near the left end of the conductor, but do not touch it. The right end of the conductor will be __________.
positive
neutral
negative
attracted
Increasing the distance between particles by a factor of 2 keeping all other factors the same, electric force will:
cause to decrease by a factor of 4
cause to increase by a factor of 4
cause to decrease by a factor of 2
cause to increase by a factor of 2
Increasing the charge on one of the particles by a factor of 2 while leaving all other factors the same, electric force will:
cause to decrease by a factor of 4
cause to increase by a factor of 4
cause to decrease by a factor of 2
cause to increase by a factor of 2
By how much does the electric force between two charges change when the distance between them is tripled?
increased by 9
also tripled
reduced by 1/3
reduced by 1/9
By how much does the electric force between two charges change when magnitudes of both charges are doubled?
increased by 4
also doubled
decreased by 2
decreased by 4
Which is NOT true for both electric and gravitational forces?
The inverse square distance law applies.
The force is either attractive or repulsive.
The force depends on physical properties of objects.
Potential energy is a function of the distance between two objects.
Two balls are repelling each other as they hang from the ceiling. What can you say about their charges?
one is positive, the other one is negative
one is negative, the other one is positive
neither both are negative nor both are positive
either both are positive or both are negative
A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. What must be the charge of the ball?
positive
negative
neutral
positive or negative
In which way is the electric force similar to the gravitational force?
Electric force is proportional to the mass of the object.
Electric force is similar in strength to gravitational force.
Electric force is both attractive and repulsive.
Electric force decreases in strength as the distance between the charges increases.
Rubber is a nonconducting material that is why it cannot easily conduct heat and electricity. Which is the best explanation for this situation?
It has excess electrons which are loosely bounded with its nuclei so it can free to move.
It has a deficiency in electrons which are tightly bounded with their nuclei so it cannot move freely.
It has few electrons.
It has no electrons.
All matters are said to be neutral wherein the numbers of electron and protons are equal so once charges it do not stay for a long time because of the following factors EXCEPT
amount of charge gain
presence of polar molecules
type of charge
type of material
