Electricity and Circuits Quiz
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Questions and Answers

A conductor carries a current of 5 A. What charge flows through the conductor in 2 minutes?

  • 300 C
  • 10 C
  • 600 C (correct)
  • 0.167 C
  • A current of 0.5 A flows through a conductor for 10 seconds. What is the amount of charge that has flowed through the conductor?

  • 0.05 C
  • 0.2 C
  • 2 C
  • 5 C (correct)
  • What is the charge on a single proton?

  • $9.1 \times 10^{-31}$ kg
  • $-1.6 \times 10^{-19}$ C
  • $+1.6 \times 10^{-19}$ C (correct)
  • $1.67 \times 10^{-24}$ kg
  • What is the unit of electric current?

    <p>Ampere (A) (B)</p> Signup and view all the answers

    If a charge of 10 Coulombs flows through a conductor in 5 seconds, what is the current through the conductor?

    <p>2 A (D)</p> Signup and view all the answers

    How does the resistance of a conductor change with an increase in its length?

    <p>Resistance increases (B)</p> Signup and view all the answers

    What effect does increasing the area of cross-section have on the resistance of a conductor?

    <p>Resistance decreases (C)</p> Signup and view all the answers

    Which material property has a direct impact on the resistance of a conductor?

    <p>Resistivity (B)</p> Signup and view all the answers

    How does the resistance of a semiconductor change with an increase in temperature?

    <p>Resistance decreases (A)</p> Signup and view all the answers

    In the formula $R eta rac{ ho L}{A}$, what does the variable S represent?

    <p>The specific resistance (C)</p> Signup and view all the answers

    What is the unit of resistivity?

    <p>Ohm-metre (D)</p> Signup and view all the answers

    What does the formula R = V/I represent in terms of electrical circuits?

    <p>The calculation of resistance. (B)</p> Signup and view all the answers

    What is the correct formula for calculating potential difference?

    <p>V = rac{W}{Q} (C)</p> Signup and view all the answers

    Which unit is not used to measure resistance?

    <p>Watts (A)</p> Signup and view all the answers

    Which material is commonly used for connecting wires due to its low resistivity?

    <p>Copper (C)</p> Signup and view all the answers

    In what unit is potential difference measured?

    <p>Volt (V) (B)</p> Signup and view all the answers

    At what temperature does mercury become a superconductor?

    <p>4.2 K (C)</p> Signup and view all the answers

    What is the conductance of a conductor with a resistance of 4 Ohms?

    <p>0.25 S (D)</p> Signup and view all the answers

    If a conductor has a resistance of one Ohm, what voltage is required for a current of 2 Amperes to flow through it?

    <p>2 volts (C)</p> Signup and view all the answers

    According to Ohm's Law, what relationship exists between current and potential difference?

    <p>Current is directly proportional to potential difference. (B)</p> Signup and view all the answers

    What is the primary reason for using tungsten as a filament in light bulbs?

    <p>High melting point and ability to emit light upon heating (B)</p> Signup and view all the answers

    What condition must remain constant for Ohm's Law to apply?

    <p>The physical state of the conductor. (B)</p> Signup and view all the answers

    Which of the following materials is used for fuse wire due to its properties?

    <p>Lead and Tin Alloy (A)</p> Signup and view all the answers

    In electrical formulas, the symbol ‘Ω’ represents which of the following?

    <p>Resistance (B)</p> Signup and view all the answers

    How is one volt defined in relation to work and charge?

    <p>It represents the potential difference when one joule of work is done to move one coulomb. (C)</p> Signup and view all the answers

    What defines an ohmic conductor?

    <p>It obeys Ohm's law. (C)</p> Signup and view all the answers

    Which of the following materials is an example of a non-ohmic conductor?

    <p>Diode (D)</p> Signup and view all the answers

    What does the slope of the V-I graph represent for ohmic conductors?

    <p>Static resistance (D)</p> Signup and view all the answers

    In a non-ohmic conductor, what is the shape of the V-I graph?

    <p>A curve (D)</p> Signup and view all the answers

    How is dynamic resistance defined in a V-I graph?

    <p>ΔV / ΔT (C)</p> Signup and view all the answers

    What is the main reason nichrome is used as a heating coil material?

    <p>It is a good conductor of heat. (B)</p> Signup and view all the answers

    Which materials are used for making resistors that do not change resistance with temperature?

    <p>Manganin and constantan. (D)</p> Signup and view all the answers

    In the formula $I = n e v$, what does the variable 'n' represent?

    <p>Number of electrons per cubic meter. (A)</p> Signup and view all the answers

    What is the key characteristic of resistors connected in series?

    <p>The current passing through each resistor is the same. (D)</p> Signup and view all the answers

    What is the value of the current (I) if $n = 6.25 \times 10^{16}$, $e = 1.6 \times 10^{-19}$ C, $v = 2$ m/s, and $t = 2$ sec?

    <p>20 mA (C)</p> Signup and view all the answers

    According to Ohm's Law, which of the following is the correct formula for voltage?

    <p>V = I R (D)</p> Signup and view all the answers

    Which statement is true regarding the configuration of resistances in parallel?

    <p>The voltage across each resistor is the same. (C)</p> Signup and view all the answers

    In a series circuit with three resistors, what can be said about the total current?

    <p>It is the same as the current through each resistor. (B)</p> Signup and view all the answers

    What impact does connecting resistors in parallel have on the overall circuit resistance?

    <p>It decreases the total resistance. (B)</p> Signup and view all the answers

    Which scenario describes an improper understanding of resistors in series?

    <p>The same voltage appears across each resistor. (B)</p> Signup and view all the answers

    What is the formula for calculating the equivalent resistance in a series circuit?

    <p>$R_s = R_1 + R_2 + R_3$ (D)</p> Signup and view all the answers

    In a parallel circuit, what remains the same across each resistor?

    <p>Potential difference across each resistor (C)</p> Signup and view all the answers

    If three resistors of equal value are connected in parallel, how would you express the equivalent resistance?

    <p>$R_p = rac{R}{3}$ (C)</p> Signup and view all the answers

    Which of the following statements is true about the equivalent resistance in series configurations?

    <p>It is always greater than the largest individual resistance. (A)</p> Signup and view all the answers

    What happens to the total current in a parallel circuit as the number of resistors increases?

    <p>It increases. (C)</p> Signup and view all the answers

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