Current Electricity | Practice MCQs Physics for Mdcat | mosaicbro.com
Current Electricity | Practice MCQs Physics for Mdcat
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Review Answers:
15
In an electrical circuit, the potential difference across a conductor is directly proportional to the current flowing through it, provided the temperature of the conductor remains the same. It is known as:
Correct Answer:C
Explanation:
This is the statement of Ohm’s law.
16
Measure of the opposition to flow of free electrons is known as:
Correct Answer:D
Explanation:
Resistance opposes the flow of electrons in a conductor.
17
The SI unit of resistance is:
Correct Answer:B
Explanation:
The SI unit of resistance is Ohm (Ω).
18
The graphical representation of Ohm’s law is:
Correct Answer:C
Explanation:
Ohm’s law gives a straight-line graph of V vs. I for constant resistance.
19
Ohm is defined as:
Correct Answer:A
Explanation:
Ohm = Volt per Ampere ($VA^{-1}$).
20
If potential difference across the conductor is one volt and one ampere current is flowing, then resistance of the conductor is:
Correct Answer:B
Explanation:
From Ohm’s law, $R = \frac{V}{I} = 1Ω$.
21
Resistance of a conductor depends upon:
Correct Answer:D
Explanation:
Resistance depends on material, length, cross-sectional area, and temperature.