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RTT220 Final Exam Questions And 100% Correct Answers
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RTT220 Final Exam Questions And 100% Correct Answersatomic number of an element is the number of - Answer protons
two isotopes of the same element have the same number of - Answer protons and
electrons, but different numbers of neutrons
atomic weight is - Answer a weighted average atomic mass of the isotopes
the formation of an ionic bond - Answer involves a transfer of one or more electrons
results in a release of energy
occurs when an electron is removed from an atom
what type of chemical bond does the sharing of a pair of electrons form - Answer
covalent
atoms of an element tend to gain or lose electrons so that they will - Answer have the
same number of outer orbital electrons as a noble gas
what does the 235 represent in uranium-235 - Answer the mass number
a positive atom is formed when - Answer a neutral atom loses an electron
an electric current can consist of - Answer positive ions flowing in a liquid
negative ions flowing in a liquid
electrons flowing in a wire
,suppose a current is flowing in a wire from right to left. which way do the electrons in
the wire move - Answer left to right
the SI unit of the electric charge is - Answer the coulomb
a quantity that measures the opposition to the flow of charge is - Answer resistance
voltage can also be called - Answer potential difference or emf
if three identical bulbs are connected in parallel across a 12-V battery, the voltage
across each bulb will be - Answer 12 V
if a new positive point charge is placed at location A directly to the right of the one
pictured, the force on it will - Answer push it to the right
two charged bodies separated by a distance d exert an electrical force on each other.
the charge on one of the bodies is doubled. the electrical forces on each body now -
Answer double
what is the usual symbol used to represent an amount of charge - Answer q
two charged bodies separated by a distance d exert an electrical force on each other.
the distance d is doubled. the electrical force on each body now - Answer decreases by
1/4
electrons are - Answer negatively charged
if the temperature of a wire increases, its resistance - Answer increases
if I short out a D cell and draw a current of 7 A for 5 s, how many coulombs of charge
, move through the circuit - Answer 35 C
the light bulbs in this circuit are connected in - Answer parallel
a battery operating a large flashlight produces a current of 2 amperes in a light bulb that
has a resistance of 4 ohms. the voltage of a battery is - Answer 8 volts
a light bulb used in a slide projector draws a current of 6 amperes when operating on
120 volts. the resistance of the light bulb in ohms is - Answer 20
the energy used by a 100-watt light bulb in one hour is - Answer 360,000 J
a heater is rated at 1200 watts for a 120-volt source. the current in amperes drawn by
the heater is - Answer 10
why is most matter electrically neutral - Answer there are equal amounts of positive and
negative charges present
you have a parallel circuit in a house that operates on 120 V with several outlets for
plugging appliances and it has a 20-A fuse in the circuit. what is the maximum number of
600-W appliances that can be plugged into the outlets without "blowing" the fuse?
Assume that if the current flow exceeds the rating of the fuse, it will blow. - Answer 4
a simple electrical circuit has a constant voltage power supply and a variable resistor.
as you increase the resistance the current flow - Answer decreases
why do we use fuses - Answer to prevent wires overheating and causing fires
if three identical bulbs are connected in a series across a 12-V battery, the voltage
across each bulb will be - Answer 4V
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