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Physics JCCC Exam 1: Questions With Solutions
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Physics JCCC Exam 1: Questions With Solutions
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Physics JCCC Exam 1: Questions With SolutionsAll atoms except hydrogen are composed of ( ), ( ), and ( ) Right Ans -
protons
neutrals
electrons
What is neutral hydrogen composed of? Right Ans - one proton and one
electron
protons and ( ) have pretty much the same mass Right Ans - neutrons
What is the fundamental unit of charge? Right Ans - e
e= Right Ans - 1.6 x 10^-19
What is the SI unit for e? Right Ans - C (coulomb)
What objects are said to be electrically neutral? Right Ans - An object or
atom with zero net charge (equal number of positive and negative charges
that cancel each other out)
What is the smallest amount of free charge? Right Ans - e
What does q stand for? Right Ans - the charge of larger magnitude
What does N stand for in q=Ne Right Ans - integer number of e (must be a
whole number)
What is the net charge ofa carbon nucleus? Right Ans - 6 protons x e
What equation do you use to find the net charge of an element? Right Ans -
q=Ne
Definition: change is neither created nor destroyed but only transfers from
one object to another. Right Ans - Law of Conservation of Charge
According to the Law of Conservation of Charge, an isolated system is always (
) Right Ans - conserved
, Which is charged : carbon atom or carbon ion Right Ans - Carbon ion,
because you add or take away electrons
Definition: substance that readily allows for the movement of electrons
through the material Right Ans - electrical conductors
electrical conductors are usually good ( ) Right Ans - thermal conductors
Name some electrical conductors? Right Ans - metals (copper, gold,
aluminum, steel)
Definition: substances that do not easily allow for the movement of electrons
through the material Right Ans - electrical insulators
Name some good electrical insulators Right Ans - rubber, glass, wood,
ceramics, rocks
Name a semi-conducting material Right Ans - silicone
What is the charge after rubbing an ebonite rod with fur? Right Ans -
negative charge
What is the charge after rubbing a glass rod with silk or plastic? Right Ans -
positive charge
Are electrons created or destroyed? Right Ans - Nope, jsust transfered
What is the net charge of a system before and after? Right Ans - always
zero
Which elements on the periodic table tend to accept electrons? why? Right
Ans - Far right, because their electron shells are almost full
What happens as you gain more electrons? Right Ans - they become
negatively charged
Placing an object in contact with ( ) allows for redistribution of charge
Right Ans - a conductor
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