Electricity and Circuits: Master Electric Charge and Circuits Concepts

Question 1

In a series circuit with a battery and multiple resistors, what happens to the current as it flows through the circuit components?

Accepted Answer

The current remains the same through all components.

Answer

The current increases through the battery and decreases through the resistors.

Answer

The current decreases through the battery and increases through the resistors.

Answer

The current varies depending on the resistance of each component.

Question 2

Which material is suitable for use as an electrical wire?

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 3

Which of the following factors is **not** considered when determining the resistance of a wire?

Accepted Answer

Temperature of the surroundings

Answer

Material of the wire

Answer

Length of the wire

Answer

Cross-sectional area of the wire

Question 4

Which of the following describes the relationship between electric current and potential difference?

Accepted Answer

Electric current is directly proportional to the potential difference across a conductor.

Answer

Electric current is the flow of positive charges.

Answer

Electric current is measured in coulombs.

Answer

Electric current can flow through conductors and insulators.

Question 5

In a DC circuit, if the resistance of a resistor is halved, what will happen to the current flowing through the resistor?

Accepted Answer

The current will double.

Answer

The current will halve.

Answer

The current will remain the same.

Answer

The current will quadruple.

Question 6

In a simple series circuit, which of these stays the same throughout the circuit?

Accepted Answer

Current

Answer

Voltage

Answer

Resistance

Answer

Power

Question 7

Which of these factors does NOT affect the resistance of a conductor?

Accepted Answer

Intensity of magnetic field

Answer

Length

Answer

Area of cross-section

Answer

Temperature

Question 8

Which factor does NOT directly influence the resistance of a wire?

Accepted Answer

Voltage applied to the wire

Answer

Length of the wire

Answer

Cross-sectional area of the wire

Answer

Material of the wire

Question 9

In a series circuit with a battery, resistor, and capacitor, what is true about the current?

Accepted Answer

Current is the same throughout the circuit.

Answer

Current is highest in the battery and decreases through the resistor and capacitor.

Answer

Current is highest in the capacitor and decreases through the resistor and battery.

Question 10

Which of the following is a limitation of Ohm's Law?

Accepted Answer

Ohm's Law does not apply to non-linear devices.

Accepted Answer

Ohm's Law assumes a constant temperature.

Answer

Ohm's Law applies to all types of conductors.

Answer

Ohm's Law can be applied to AC circuits.

Question 11

Which of the following is **not** a semiconductor material?

Accepted Answer

Metal

Answer

Silicon

Answer

Germanium

Answer

Compound semiconductor

Question 12

In an inductor with a constant current flowing through it, where is energy stored?

Accepted Answer

Magnetic field generated by the current

Answer

Electric field surrounding the inductor

Answer

Capacitance of the inductor

Question 13

In a parallel circuit, the current through each branch is:

Accepted Answer

Equal to the current in the main circuit

Answer

Less than the current in the main circuit

Answer

Greater than the current in the main circuit

Question 14

A battery, resistor, and capacitor are connected in series. What happens to the capacitor?

Accepted Answer

It charges gradually to the battery's voltage.

Answer

It charges instantly to the battery's voltage.

Answer

It completely discharges through the resistor.

Answer

It has no effect on the circuit.

Question 15

According to Ohm's Law, how does electric current relate to resistance in a circuit?

Accepted Answer

Current is inversely proportional to resistance.

Answer

Current is directly proportional to resistance.

Answer

Current is independent of resistance.

Answer

Resistance is directly proportional to current.

Question 16

In a simple series circuit consisting of a battery, a resistor, and a light bulb, what will happen to the brightness of the light bulb if the resistance of the resistor is increased?

Accepted Answer

The brightness will decrease.

Answer

The brightness will increase.

Answer

The brightness will remain unchanged.

Answer

The brightness will reverse direction.

Question 17

In a transformer, what factor determines the ratio of the output voltage to the input voltage?

Accepted Answer

Turns ratio of the transformer

Answer

Frequency of the input voltage

Answer

Core material of the transformer

Answer

Load connected to the secondary winding

Question 18

In a series electrical circuit with multiple resistors, what is the relationship between the equivalent resistance and the individual resistances?

Accepted Answer

The equivalent resistance is equal to the sum of the individual resistances.

Answer

The equivalent resistance is less than the smallest individual resistance.

Answer

The equivalent resistance is greater than the sum of the individual resistances.

Question 19

In an AC circuit, the current and voltage can be:

Accepted Answer

Either in phase or out of phase, depending on the circuit elements

Answer

Always in phase with each other

Answer

Always out of phase with each other

Question 20

The unit of electric charge in the International System of Units (SI) is:

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 21

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Lower than the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Dependent on the voltage applied

Question 22

The energy stored in a capacitor is:

Accepted Answer

Proportional to the square of the voltage and proportional to the capacitance

Answer

Inversely proportional to the square of the voltage and inversely proportional to the capacitance

Answer

Proportional to the voltage and inversely proportional to the capacitance

Answer

Proportional to the capacitance and inversely proportional to the voltage

Question 23

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the individual currents

Answer

Lower than the sum of the individual currents

Answer

Greater than the sum of the individual currents

Answer

Independent of the voltage applied

Question 24

The magnetic field around a current-carrying wire has the shape of a(n):

Accepted Answer

Circle

Answer

Radial line

Answer

Ellipse

Answer

Parabola

Question 25

Which of the following is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Glass

Question 26

Which of the following is a renewable source of electrical energy?

Accepted Answer

Solar panels

Answer

Fossil fuels

Answer

Nuclear power plants

Answer

Coal-fired power plants

Question 27

The power dissipated in a circuit is:

Accepted Answer

Equal to the product of voltage and current

Answer

Inversely proportional to the product of voltage and current

Answer

Proportional to the square of the voltage

Answer

Proportional to the square of the current

Question 28

The SI unit of electric current is referred to as:

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Coulomb

Question 29

An inductor's energy storage occurs within its:

Accepted Answer

Magnetic field

Answer

Electric field

Answer

Capacitance

Answer

Resistance

Question 30

When a coil of wire experiences a changing magnetic field, what phenomenon occurs within the coil?

Accepted Answer

Electric current generation

Answer

Magnetic field generation

Answer

Electromagnetic force generation

Answer

Capacitance generation

Question 31

Which device is responsible for converting AC current to DC current?

Accepted Answer

Rectifier

Answer

Transformer

Answer

Diode

Answer

Capacitor

Question 32

In an electrical circuit, the power dissipated across a resistor is determined by:

Accepted Answer

Current squared multiplied by resistance

Answer

Voltage multiplied by current

Answer

Voltage squared divided by resistance

Answer

Power is always zero

Question 33

To ensure electrical safety, which of these precautions is essential?

Accepted Answer

Wear insulated gloves when handling electrical components

Accepted Answer

Use equipment with proper insulation to prevent current leakage

Answer

Ignore warning labels and safety instructions

Question 34

Which SI unit is used to quantify electric charge?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Newton

Answer

Weber

Question 35

How is the magnetic field strength B related to the current I flowing through a wire?

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Quadratically proportional

Answer

No relationship

Question 36

In which component is electrical energy stored in its electric field?

Accepted Answer

Capacitor

Answer

Inductor

Answer

Resistor

Answer

Transformer

Question 37

Which property is characteristic of an ideal resistor?

Accepted Answer

Resistance is constant with voltage

Answer

Resistance varies with temperature

Answer

Resistance is zero at high frequencies

Answer

Resistance is negative

Question 38

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the individual branch currents

Answer

Greater than the sum of the individual branch currents

Answer

Less than the sum of the individual branch currents

Answer

Independent of the branch currents

Question 39

What is the primary function of a transformer?

Accepted Answer

Increase or decrease voltage

Answer

Increase or decrease current

Answer

Store electrical energy

Answer

Convert AC to DC

Question 40

Which of the following is the SI unit of electric charge?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 41

A current of 2 A flows through a resistor of 10 Ω. What is the voltage across the resistor according to Ohm's law?

Accepted Answer

5 V

Answer

10 V

Answer

20 V

Answer

40 V

Question 42

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Glass

Question 43

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of individual resistances

Answer

Greater than the sum of individual resistances

Answer

Less than the sum of individual resistances

Answer

Independent of the individual resistances

Question 44

Which term describes the ability of a capacitor to store charge?

Accepted Answer

Capacitance

Answer

Inductance

Answer

Resistance

Answer

Voltage

Question 45

The direction of the induced current in a coil is determined by:

Accepted Answer

Lenz's law

Answer

Ohm's law

Answer

Faraday's law

Answer

Kirchhoff's law

Question 46

The power factor of a circuit is a measure of:

Accepted Answer

The ratio of real power to apparent power

Answer

The ratio of reactive power to apparent power

Answer

The ratio of apparent power to real power

Answer

The ratio of reactive power to real power

Question 47

In long-distance power transmission, which factor has the most significant impact on efficiency?

Accepted Answer

Voltage level

Answer

Conductor material

Answer

Line losses

Answer

Distance of transmission

Question 48

Which renewable energy source relies primarily on organic matter and microbial processes?

Accepted Answer

Bioenergy

Answer

Solar

Answer

Wind

Question 49

Which of the following is the SI unit of electric charge?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 50

In a series circuit, the total resistance is

Accepted Answer

Equal to the sum of individual resistances

Answer

Less than the sum of individual resistances

Answer

Cannot be determined without knowing the individual resistances

Answer

Greater than the sum of individual resistances

Question 51

The process by which a changing magnetic field induces an electric field is called:

Accepted Answer

Electromagnetic induction

Answer

Capacitance

Answer

Conduction

Answer

Resistance

Question 52

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of individual currents

Answer

Less than the sum of individual currents

Answer

Cannot be determined without knowing the individual currents

Answer

Greater than the sum of individual currents

Question 53

The power dissipated by a resistor is given by:

Accepted Answer

I²R

Answer

VI

Answer

V²/R

Answer

IR

Question 54

Which SI unit measures electric charge?

Accepted Answer

Coulomb (C)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 55

Which material conducts electricity effectively?

Accepted Answer

Iron

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 56

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the resistances of all components

Answer

Lower than the resistance of any component

Answer

Higher than the resistance of any component

Answer

Dependent on the voltage applied

Question 57

Which of the following is NOT a type of electromagnetic induction?

Accepted Answer

Capacitive induction

Answer

Self-induction

Answer

Mutual induction

Answer

Transformer induction

Question 58

A capacitor stores energy primarily in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Gravitational field

Answer

Chemical energy

Question 59

The power dissipated in a resistor is given by:

Accepted Answer

P = I²/R

Answer

P = VI

Answer

P = V²/R

Answer

P = VR

Question 60

Describe the role of semiconductors in the operation of a solar cell.

Accepted Answer

Semiconductors generate an electric field when exposed to light, enabling current flow.

Answer

Semiconductors act as insulators, preventing the flow of electrons.

Answer

Semiconductors store electrical energy, similar to batteries.

Answer

Semiconductors amplify electrical signals in solar cells.

Question 61

A 12-volt battery is connected to a resistor with a resistance of 6 ohms. Calculate the current flowing through the resistor.

Accepted Answer

2 A

Answer

0.5 A

Answer

1 A

Answer

3 A

Question 62

The SI unit of electric charge is known as:

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 63

In a closed electric circuit, the current flowing through its components is:

Accepted Answer

Identical throughout the circuit

Answer

Zero

Answer

Greater in the battery

Answer

Greater in the resistor

Question 64

Which of the following factors influence the resistance of a conductor?

Accepted Answer

Length, cross-sectional area, and material composition

Answer

Voltage only

Answer

Current only

Answer

Temperature only