AnswersKCPS Physics First 2027Electricity and Magnetism

Practice Test Answers

12 verified answers
1
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Which change will correct the error in Badri’s table?

A
changing “Indirect” to “Direct”
B
changing “Direct” to “Indirect”
C
changing “Mass” to “Amount of electric charge”
D
changing “Distance” to “Amount of electric charge”
2
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What does voltage describe?

A
how fast a material conducts electrical flow
B
how much current can flow
C
how much a material resists electrical flow
D
how fast current can flow
3

Two bar magnets are held close together. When they are released, they move toward one another. Which best describes the original placement of the magnets?

A
The magnets are placed end to end with the south pole of each pointing toward the other.
B
The magnets are placed side by side with the like poles of each magnet near the other.
C
The magnets are placed end to end with the north pole of each pointing toward the other.
D
The magnets are placed side by side with the opposite poles of each magnet near the other.
4

Which current delivered more charge, and how much more charge did it deliver? Current X is 2 point 5 cap A and runs for 39 seconds. Current Y is 3 point 8 cap A and runs for 24 seconds.

A
Y delivered 1 point 3 cap c more than X.
B
X delivered 6 point 3 cap c more than Y.
C
X delivered 97 point 5 cap c more than Y.
D
Y delivered 91 point 2 cap c more than X.
5

What must be true in order for magnetism to induce an electric current in a wire?

A
The wire must be part of an open circuit.
B
There needs to be a switch in the circuit.
C
The wire must be part of a closed circuit.
D
There cannot be a switch in the circuit.
7

Liang is working with an electrical circuit. She replaces a straight electrical wire with a coiled wire. What is Liang most likely trying to do?

A
decrease the strength of the magnetic field when current flows through the circuit
B
increase the current that flows through the wire when the circuit is active
C
decrease the current that flows through the wire when the circuit is active
D
increase the strength of the magnetic field when current flows through the circuit
9

The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released?

A
It will move away from the second magnet because like poles repel.
B
It will move toward the second magnet because like poles attract.
C
It will move toward the second magnet because like poles repel.
D
It will move away from the second magnet because like poles attract.
11

Which basic feature is missing from the circuit?

A
conducting wires
B
an energy source
C
a switch
D
a device that uses energy
12

Based on the field lines, what are the charges of the objects?

A
A: negative B: positive
B
A: negative B: negative
C
A: positive B: positive
D
A: positive B: negative

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