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Resistivity MDCAT MCQs with Answers

Resistivity MDCAT MCQs

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

Resistivity MDCAT MCQs Test Preparations

Resistivity is measured in:
a) Ohm-meter
b) Volt-meter
c) Ampere-meter
d) Watt-meter

Answer
a) Ohm-meter

Resistivity is a property of:
a) A material
b) A circuit
c) A current source
d) An electric field

Answer
a) A material

The resistivity of a material depends on its:
a) Temperature
b) Length
c) Cross-sectional area
d) Voltage

Answer
a) Temperature

Which material has the lowest resistivity?
a) Silver
b) Copper
c) Gold
d) Aluminum

Answer
a) Silver

Resistivity is inversely proportional to:
a) Conductivity
b) Temperature
c) Voltage
d) Current

Answer
a) Conductivity

As the temperature of a conductor increases, its resistivity generally:
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero

Answer
a) Increases

The resistivity of a semiconductor with increasing temperature:
a) Decreases
b) Increases
c) Remains constant
d) Varies randomly

Answer
a) Decreases

The resistivity of a metal wire is typically:
a) Low
b) High
c) Infinite
d) Zero

Answer
a) Low

A material with high resistivity is typically:
a) An insulator
b) A conductor
c) A semiconductor
d) A superconductor

Answer
a) An insulator

The resistivity of pure silicon at room temperature is:
a) Moderate
b) High
c) Low
d) Infinite

Answer
b) High

Which of the following materials is considered a good conductor due to its low resistivity?
a) Copper
b) Iron
c) Wood
d) Rubber

Answer
a) Copper

The unit of electrical resistivity is:
a) Ω·m
b) Ω/m
c) Ω/m²
d) Ω

Answer
a) Ω·m

The resistivity of a perfect conductor is:
a) Zero
b) Very high
c) Infinite
d) Undefined

Answer
a) Zero

Which factor does not affect the resistivity of a material?
a) Temperature
b) Material composition
c) Cross-sectional area
d) Impurities

Answer
c) Cross-sectional area

The resistivity of carbon at room temperature is:
a) High
b) Low
c) Moderate
d) Infinite

Answer
c) Moderate

Resistivity is directly proportional to:
a) The resistance of the material
b) The current through the material
c) The voltage across the material
d) The power dissipated

Answer
a) The resistance of the material

As the temperature decreases, the resistivity of most metals:
a) Decreases
b) Increases
c) Remains constant
d) Becomes infinite

Answer
a) Decreases

The resistivity of an alloy is generally:
a) Higher than its constituent metals
b) Lower than its constituent metals
c) Equal to the average of its constituent metals
d) Independent of its constituent metals

Answer
a) Higher than its constituent metals

For a given material, if the temperature coefficient of resistivity is positive, then as temperature increases, the resistivity:
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero

Answer
a) Increases

Which of the following has the highest resistivity?
a) Glass
b) Aluminum
c) Copper
d) Silicon

Answer
a) Glass

The resistivity of a material is defined as:
a) The resistance per unit length and cross-sectional area
b) The product of resistance and cross-sectional area
c) The inverse of conductivity
d) The product of voltage and current

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

Superconductors are materials with resistivity:
a) Close to zero
b) Very high
c) Infinite
d) Variable

Answer
a) Close to zero

Which material has higher resistivity: Nichrome or Copper?
a) Nichrome
b) Copper
c) Both have the same resistivity
d) It depends on temperature

Answer
a) Nichrome

The resistivity of an insulator is typically:
a) High
b) Low
c) Moderate
d) Zero

Answer
a) High

The temperature coefficient of resistivity indicates:
a) The rate of change of resistivity with temperature
b) The absolute resistivity of the material
c) The voltage drop across the material
d) The power dissipation in the material

Answer
a) The rate of change of resistivity with temperature

The resistivity of semiconductors decreases with:
a) Increasing temperature
b) Decreasing temperature
c) Increasing voltage
d) Decreasing current

Answer
a) Increasing temperature

Which of the following factors can affect the resistivity of a semiconductor?
a) Temperature
b) Impurities
c) Electric field
d) All of the above

Answer
d) All of the above

In a conductor, resistivity is mainly caused by:
a) Collisions between electrons and atoms
b) The potential difference
c) The magnetic field
d) The capacitance of the material

Answer
a) Collisions between electrons and atoms

Which material typically has the highest resistivity?
a) Rubber
b) Copper
c) Aluminum
d) Silver

Answer
a) Rubber

For a given material, resistivity is:
a) A constant
b) A variable
c) Dependent on the shape of the material
d) Inversely proportional to resistance

Answer
a) A constant

The resistivity of a conductor is defined as the:
a) Resistance per unit length and cross-sectional area
b) Voltage per unit length
c) Current per unit cross-sectional area
d) Power per unit resistance

Answer
a) Resistance per unit length and cross-sectional area

The resistivity of a wire does not depend on its:
a) Length
b) Cross-sectional area
c) Material
d) Temperature

Answer
a) Length

Resistivity is represented by the symbol:
a) ρ
b) σ
c) ε
d) λ

Answer
a) ρ

The resistivity of metals typically increases with:
a) Increasing temperature
b) Increasing pressure
c) Increasing current
d) Increasing magnetic field

Answer
a) Increasing temperature

Resistivity of a conductor at absolute zero temperature is:
a) Very low
b) Infinite
c) Zero
d) Moderate

Answer
c) Zero

The resistivity of a pure metal at room temperature is generally:
a) Lower than that of alloys
b) Higher than that of alloys
c) The same as that of alloys
d) Variable

Answer
a) Lower than that of alloys

The resistivity of a substance is affected by:
a) Temperature
b) Pressure
c) Mechanical stress
d) All of the above

Answer
d) All of the above

Resistivity of a material is not affected by:
a) The shape of the material
b) The type of material
c) Temperature
d) Impurities

Answer
a) The shape of the material

Which of the following best describes the relationship between resistivity (ρ) and conductivity (σ)?
a) ρ = 1/σ
b) ρ = σ
c) ρ = σ²
d) ρ = 1/σ²

Answer
a) ρ = 1/σ

Which of the following has a resistivity closest to that of copper?
a) Gold
b) Aluminum
c) Iron
d) Silver

Answer
d) Silver

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