Welcome to the **Electrical Resistance MDCAT** MCQs with Answers. In this post, we have shared **Electrical Resistance ** Multiple Choice Questions and Answers for PMC MDCAT** 2024**. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding **Electrical Resistance ** MCQs in this MDCAT Online Test.

## Electrical Resistance MDCAT MCQs Test Preparations

Electrical resistance is measured in:

a) Volts

b) Ohms

c) Amperes

d) Watts

The resistance of a conductor depends on:

a) Material, length, and cross-sectional area

b) Voltage and current

c) Temperature and pressure

d) Frequency and wavelength

Which material is typically used as a resistor due to its high resistance?

a) Copper

b) Nichrome

c) Gold

d) Silver

The SI unit of electrical resistance is:

a) Coulomb

b) Farad

c) Ohm

d) Tesla

The reciprocal of resistance is known as:

a) Conductance

b) Capacitance

c) Inductance

d) Impedance

A 100Ω resistor is connected to a 10V power supply. The current through the resistor is:

a) 0.1A

b) 1A

c) 10A

d) 100A

If the length of a wire is doubled, its resistance will:

a) Double

b) Halve

c) Remain the same

d) Become zero

The resistance of a material increases with:

a) Increase in temperature

b) Decrease in length

c) Increase in cross-sectional area

d) Decrease in temperature

Which of the following materials typically has the lowest electrical resistance?

a) Silver

b) Copper

c) Iron

d) Aluminum

In a series circuit, the total resistance is:

a) The sum of the resistances of the components

b) The product of the resistances of the components

c) The reciprocal of the sum of the resistances

d) The difference of the resistances of the components

A conductor with a resistance of zero is called a:

a) Superconductor

b) Insulator

c) Semiconductor

d) Dielectric

Which device is used to measure electrical resistance?

a) Ammeter

b) Voltmeter

c) Ohmmeter

d) Galvanometer

A wire’s resistance is inversely proportional to its:

a) Cross-sectional area

b) Length

c) Temperature

d) Volume

In a parallel circuit, the total resistance is:

a) Less than the smallest resistance

b) Equal to the largest resistance

c) The sum of all resistances

d) The average of all resistances

The resistivity of a material is defined as:

a) The resistance per unit length and cross-sectional area

b) The current per unit voltage

c) The voltage per unit current

d) The power per unit voltage

A material that does not allow electricity to flow through it easily is called a(n):

a) Insulator

b) Conductor

c) Semiconductor

d) Resistor

The resistance of a semiconductor:

a) Decreases with an increase in temperature

b) Increases with an increase in temperature

c) Remains constant with temperature changes

d) Is independent of temperature

The resistance of a material is directly proportional to its:

a) Length

b) Width

c) Thickness

d) Density

Which law relates the resistance of a conductor to its resistivity, length, and cross-sectional area?

a) Ohm’s Law

b) Kirchhoff’s Law

c) Coulomb’s Law

d) Joule’s Law

An increase in the cross-sectional area of a wire results in:

a) A decrease in resistance

b) An increase in resistance

c) No change in resistance

d) A linear increase in resistance

Which of the following factors does not affect the resistance of a conductor?

a) Temperature

b) Length

c) Cross-sectional area

d) Color

In an ohmic conductor, the resistance:

a) Remains constant with varying current

b) Decreases with increasing current

c) Increases with increasing current

d) Varies with the square of the current

The total resistance of two resistors in series, R1 and R2, is given by:

a) R1 + R2

b) R1 – R2

c) 1/R1 + 1/R2

d) R1/R2

The total resistance of two resistors in parallel, R1 and R2, is given by:

a) 1/R1 + 1/R2

b) R1 + R2

c) 1/(1/R1 + 1/R2)

d) R1 – R2

The resistance of a metallic conductor is caused by:

a) Collisions of electrons with atoms

b) The electric field within the conductor

c) The motion of free electrons

d) The length of the conductor

The resistance of a resistor at room temperature is 10Ω. What happens to the resistance if the temperature increases?

a) It increases

b) It decreases

c) It remains constant

d) It fluctuates

In a circuit, if the resistance is doubled and the voltage remains constant, the current will:

a) Be halved

b) Be doubled

c) Remain the same

d) Be zero

For a given material, resistivity is:

a) A constant property

b) Dependent on length and area

c) Variable with current

d) A function of voltage

The resistance of a wire is directly proportional to its:

a) Resistivity and length

b) Length and cross-sectional area

c) Voltage and current

d) Power and energy

The material with the highest electrical resistance is:

a) Nichrome

b) Copper

c) Silver

d) Aluminum

Resistance per unit length of a wire is known as:

a) Resistivity

b) Conductance

c) Resistive index

d) Specific resistance

Which component is used to control the current in a circuit?

a) Resistor

b) Capacitor

c) Inductor

d) Transformer

The resistance of an ideal conductor is:

a) Zero

b) Infinite

c) Very high

d) Very low

If the resistivity of a material is 1.6 x 10^-8 Ωm, the material is likely to be:

a) Copper

b) Aluminum

c) Iron

d) Nichrome

Which of the following has the highest resistivity?

a) Copper

b) Aluminum

c) Silver

d) Glass

In a thermistor, the resistance:

a) Changes with temperature

b) Is constant

c) Decreases with increasing temperature only

d) Increases with increasing temperature only

A resistor with a tolerance of 5% means:

a) The actual resistance may vary by ±5% from the labeled value

b) The resistor can only handle a 5% current increase

c) The resistor can only handle a 5% voltage increase

d) The resistor will overheat at 5% over its rated value

What is the effect of impurities on the resistance of a metal?

a) Increases the resistance

b) Decreases the resistance

c) Does not affect the resistance

d) Makes the resistance infinite

The resistance of an electrical appliance rated at 100W, 220V is:

a) 484Ω

b) 242Ω

c) 22Ω

d) 44Ω

In a variable resistor, the resistance is:

a) Adjusted by changing the length of the resistive element in the circuit

b) Fixed and cannot be changed

c) Inversely proportional to the applied voltage

d) Proportional to the temperature

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