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Resistivity

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Q. If two resistors of resistivity ρ are connected in series, what is the total resistivity of the combination?
  • A. ρ
  • B. 2ρ
  • C. ρ/2
  • D. Depends on the configuration
Q. If two wires of the same material are connected in series, how does their combined resistance compare to the individual resistances?
  • A. Less than both
  • B. Equal to the sum
  • C. Greater than both
  • D. Depends on length
Q. In a material with a resistivity of 2 x 10^-8 Ω·m, what is the resistance of a 10 m long wire with a cross-sectional area of 1 mm²?
  • A. 0.02 Ω
  • B. 0.2 Ω
  • C. 2 Ω
  • D. 20 Ω
Q. In a material with a resistivity of 2 x 10^-8 Ω·m, what is the resistance of a 3 m long wire with a cross-sectional area of 1 mm²?
  • A. 0.006 Ω
  • B. 0.018 Ω
  • C. 0.024 Ω
  • D. 0.036 Ω
Q. In a series circuit, if one resistor has a resistance of 5 Ω and another has 10 Ω, what is the total resistance?
  • A. 5 Ω
  • B. 10 Ω
  • C. 15 Ω
  • D. 20 Ω
Q. In a series circuit, if one resistor has a resistivity of 5 Ω·m and another has 10 Ω·m, what is the total resistance?
  • A. 5 Ω
  • B. 10 Ω
  • C. 15 Ω
  • D. 20 Ω
Q. In a temperature-resistivity graph, what does the slope represent for a metallic conductor?
  • A. Resistivity
  • B. Temperature coefficient of resistivity
  • C. Resistance
  • D. Conductivity
Q. What happens to the resistance of a wire if its diameter is halved while keeping the length constant?
  • A. It doubles
  • B. It halves
  • C. It quadruples
  • D. It remains the same
Q. What happens to the resistivity of a superconductor as it approaches absolute zero?
  • A. Increases
  • B. Decreases
  • C. Becomes infinite
  • D. Becomes zero
Q. What happens to the resistivity of a superconductor as it transitions to the superconducting state?
  • A. Increases
  • B. Decreases
  • C. Becomes zero
  • D. Remains constant
Q. What happens to the total resistance in a parallel circuit if more resistors are added?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the resistors
Q. What happens to the total resistance in a parallel circuit if one of the resistors is removed?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Depends on the other resistors
Q. What is the effect of increasing the cross-sectional area of a conductor on its resistance?
  • A. Increases resistance
  • B. Decreases resistance
  • C. No effect
  • D. Depends on the material
Q. What is the effect of increasing the length of a conductor on its resistance?
  • A. Increases resistance
  • B. Decreases resistance
  • C. No effect
  • D. Depends on the material
Q. What is the effect of increasing the length of a conductor on its resistivity?
  • A. Increases
  • B. Decreases
  • C. No effect
  • D. Depends on the material
Q. What is the resistivity of a material if a 5 m long wire with a cross-sectional area of 1 mm² has a resistance of 10 Ω?
  • A. 2 x 10^-6 Ω·m
  • B. 5 x 10^-6 Ω·m
  • C. 1 x 10^-5 Ω·m
  • D. 2 x 10^-5 Ω·m
Q. What is the resistivity of a material if a wire of length 2 m and cross-sectional area 1 mm² has a resistance of 4 ohms?
  • A. 2 x 10^-6 Ω·m
  • B. 4 x 10^-6 Ω·m
  • C. 8 x 10^-6 Ω·m
  • D. 1 x 10^-6 Ω·m
Q. What is the unit of resistivity?
  • A. Ohm
  • B. Ohm-meter
  • C. Siemens
  • D. Coulomb
Q. Which material has the highest resistivity?
  • A. Copper
  • B. Aluminum
  • C. Iron
  • D. Rubber
Q. Which material has the lowest resistivity?
  • A. Copper
  • B. Aluminum
  • C. Silver
  • D. Iron
Q. Which of the following factors does NOT affect the resistivity of a material?
  • A. Temperature
  • B. Material type
  • C. Length of the conductor
  • D. Cross-sectional area
Q. Which of the following materials has the highest resistivity?
  • A. Copper
  • B. Aluminum
  • C. Silver
  • D. Rubber
Showing 31 to 52 of 52 (2 Pages)

Resistivity MCQ & Objective Questions

Understanding resistivity is crucial for students preparing for school and competitive exams in India. This fundamental concept in physics not only helps in grasping the behavior of materials but also plays a significant role in various objective questions and MCQs. Practicing resistivity MCQ questions can enhance your exam preparation and boost your confidence in tackling important questions effectively.

What You Will Practise Here

  • Definition and significance of resistivity in materials
  • Key formulas related to resistivity and conductivity
  • Factors affecting resistivity and their implications
  • Applications of resistivity in real-world scenarios
  • Diagrams illustrating resistivity concepts
  • Comparison of resistivity in different materials
  • Sample objective questions with detailed explanations

Exam Relevance

The topic of resistivity is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that require them to apply formulas, analyze graphs, or solve numerical problems related to resistivity. Common question patterns include direct MCQs, assertion-reason type questions, and numerical problems that assess conceptual understanding.

Common Mistakes Students Make

  • Confusing resistivity with resistance and conductivity
  • Overlooking the temperature dependence of resistivity
  • Misapplying formulas in numerical problems
  • Ignoring the significance of units in calculations
  • Failing to interpret graphical data related to resistivity

FAQs

Question: What is resistivity?
Answer: Resistivity is a property of materials that quantifies how strongly they oppose the flow of electric current, typically measured in ohm-meters.

Question: How does temperature affect resistivity?
Answer: Generally, the resistivity of conductors increases with temperature, while that of semiconductors decreases.

Question: Why is it important to practice resistivity MCQs?
Answer: Practicing resistivity MCQs helps solidify your understanding of the concept and prepares you for various question formats in exams.

Now is the time to enhance your understanding of resistivity! Dive into our practice MCQs and test your knowledge to excel in your exams.

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