Mechanical Aptitude Mechanical Aptitude Basic Electrical Circuits Questions and Answers 3

Question 1

Which material is the best conductor of electricity?

Accepted Answer

Copper

Answer

Copper is an excellent electrical conductor due to its low resistivity and is widely used in electrical wiring.

Question 2

Two resistors of 4 ohms and 6 ohms are connected in series. What is the total resistance?

Accepted Answer

10 ohms

Answer

In a series circuit, total resistance is the sum of individual resistances: 4 + 6 = 10 ohms.

Question 3

What happens to current in a circuit if the voltage is doubled while resistance stays the same?

Accepted Answer

Current doubles

Answer

According to Ohm's Law (I = V/R), current is directly proportional to voltage, so doubling voltage doubles current.

Question 4

Which device is used to measure the current flowing through a circuit?

Accepted Answer

Ammeter

Answer

An ammeter measures current in amperes and must be connected in series with the circuit.

Question 5

What is the function of a diode in an electrical circuit?

Accepted Answer

Allows current to flow in only one direction

Answer

A diode permits current flow in the forward direction and blocks it in the reverse direction, acting as a one-way valve for electricity.

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