# Physics: Practice Questions On Electric Currents And Force!

23 Questions | Total Attempts: 69  Settings  What do you understand about the digestive system, and would you like to try this quiz? The human digestive system involves the gastrointestinal tract and the organs involved, including the salivary glands, pancreas, liver, and gallbladder. Digestion pertains to the breakdown of food into smaller pieces until it can be absorbed into the body. If you choose to learn more about the digestive system, this is the quiz for you.

• 1.
Ohm's law states that the current flowing through a piece of metal is proportional to the potential differnce across it, if ...
• A.

Resistance is constant

• B.

Pressure is constant

• C.

Cross-sectional area is constant

• D.

Temperature is constant

• 2.
"A current that flows in just one direction is known as a [...]"
• 3.
One [...] of negative charge is the chrage carried by a total of 6.25 * 10^18 electrons
• 4.
A current that constantly changes direction is known as
• A.

Changing current

• B.

Variable current

• C.

Variable resistor

• D.

Alternating current

• 5.
A conventional current flows from ...
• A.

Positive to negative

• B.

Negative to positive

• 6.
The potential difference between two points is the energy difference per unit distance moved.
• A.

True

• B.

False

• 7.
The speed of electrons due to the current is called their [...] velocity
• 8.
A device with constant resistance is known as a(n) ...
• 9.
The rate of flow of eletrical charge is the definition of ...
• A.

Wave

• B.

Ray

• C.

Circuit

• D.

Current

• 10.
So, current is the name for moving charges, and the path they follow is called the [...]
• 11.
A perfect ammeter has infinite resistance
• A.

True

• B.

False

• 12.
The total energy difference per unit charge around a circuit is called the
• A.

Internal energy

• B.

Electromotive force (e.m.f.)

• C.

Internal resistance

• D.

Drawn

• 13.
In a series circuit, the charges are allowed more than one possible route around the circuit
• A.

True

• B.

False

• 14.
A variable potential divider (when two resistors "divide up" the potential difference of the battery) is known as a(n)
• 15.
A resistor whose value of resistance depends on its temperature is known as a(n)
• A.

Light dependent resistor

• B.

Strain gauge

• C.

Thermistor

• D.

Negative temperature coefficient (NTC)

• 16.
What is a strain gauge?
• A.

A device whose resistance depends on the amount of light shining through its surface

• B.

A device whoe output voltage depnds on any extension or compression resulting from a change of length

• C.

A device whose value of resistance depends on its temperature

• D.

A circuit which has an output potential difference that depends on an external factor

• 17.
"Every mass in the Universe attracts all other masses in the Universe" This is the fundamental statement of Newton's theory of [...]
• 18.
Matter that contains no charge, or equal amounts of positive and negative charge, is said to be electrically [...]
• 19.
What is a conductor?
• A.

A material that allows the flow of charge through it

• B.

A material through which a charge cannot flow

• C.

A material with infinite internal resistance

• D.

The point charge within an electric field

• 20.
The force that exists between all charges is known as the ...
• 21.
Electric field is the force per unit charge on a negative test charge
• A.

True

• B.

False

• 22.
The lines of a magnetic field are also called ...
• A.

Magnetic lines

• B.

Field lines

• C.

Flux lines

• D.

Magnelines

• 23.
"When a current-carrying wire is placed in a magnetic field, the magnetic interaction between the two results in a force" What is being defined?
• A.

Electrostatic effect

• B.

Magnetic effect

• C.

Motor effect

• D.

Electric effect

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