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11 Questions

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Resistance/Circuits MCQ 1

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Questions and Answers

What is the SI unit of resistance?

Ohms (correct)

Amps

Watts

Joules

How is the heat produced in a conductor related to the current flowing through it?

Directly proportional to the current

Proportional to the square of the current (correct)

Inversely proportional to the current

Unrelated to the current

What does a variable resistor allow you to do?

Change the current flow

Change the voltage

Increase power consumption

Vary the resistance (correct)

In a series circuit, what can be said about the current along the wire?

It remains the same at every point Signup and view all the answers

What happens to the current at junctions in parallel parts of a circuit?

It remains the same at each junction Signup and view all the answers

According to Ohm's Law, what is the relationship between current, potential difference, and resistance?

Current is directly proportional to potential difference and inversely proportional to resistance Signup and view all the answers

Which relationship best describes how temperature affects the resistance of metallic conductors?

As temperature increases, resistance increases due to increased impedance Signup and view all the answers

What is the formula for calculating resistance in series circuits?

$R_T = R_1 + R_2$ Signup and view all the answers

What is the main purpose of a Wheatstone bridge?

To measure the resistance of an unknown resistor Signup and view all the answers

What is the formula for resistivity ($\rho$) in terms of resistance ($R$), cross-sectional area ($A$), and length ($l$) of a body?

$\rho = RA / l$ Signup and view all the answers

In a parallel circuit, how are resistances connected?

$1/R_T = 1/R_1 * 1/R_2$ Signup and view all the answers