# Electrical resistance: Quiz

Question 1: The electric resistance of a typical intrinsic (non doped) ________ decreases exponentially with the temperature:
SemiconductorPhysicsQuantum mechanicsCondensed matter physics

Question 2: If a wire conducts high-frequency alternating current then the effective cross sectional area of the wire is reduced because of the ________.

Question 3: In ________, electrical conduction happens not by band electrons or holes, but by full atomic species (ions) traveling, each carrying an electrical charge.

Question 4: Discovered by ________ in 1827,[1] electrical resistance shares some conceptual parallels with the mechanical notion of friction.
Georg OhmAndré-Marie AmpèreIsaac NewtonWilliam Thomson, 1st Baron Kelvin

Question 5: When an electrical potential difference (a voltage) is applied across the metal, the electrons drift from one end of the conductor to the other under the influence of the ________.
Lorentz forceMaxwell's equationsMagnetic fieldElectric field

Question 6: Small holes in the membranes, called ________, are selective to specific ions and determine the membrane resistance.
Ion channelSodium channelPotassium channelLigand-gated ion channel

Question 7: An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional area, and proportional to the ________ of the material.
SiliconCarbonAluminiumResistivity

Question 8: The electrical resistance of an object is a measure of its opposition to the passage of a steady ________.
Electric chargeMagnetic fieldMaxwell's equationsElectric current

Question 9: ________, a new standard for measuring resistance.
Quantum Hall effectFractional quantum Hall effectKlaus von KlitzingGraphene

Question 10: See the discussion on ________ for details about devices constructed to take advantage of this effect.
Piezoresistive effectStrain gaugeElectrical resistanceElectrical conductivity