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Electricity Test - 13

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Electricity Test - 13
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  • Question 1
    1 / -0

    An electric device draws a current of 1.5 A and is kept on for 4 hours. What is the total charge that flows through this device?

    Solution

    The total charge that flows through the electric device, Q = I x t

    or Q = (1.5 A) x (4 hours)

    or Q = (1.5 A) x (4 x 60 x 60 sec)

    or Q = 21600 C

  • Question 2
    1 / -0

    When two objects are rubbed together, one object loses some of its free electrons while the other gains the same number of these free electrons. Which object gains the positive charge?

    Solution

    Electrons are negatively-charged particles. The object losing electrons gains positive charge. The object gaining electrons gains negative charge.

  • Question 3
    1 / -0

    The path of motion of free electrons in a metal is:

    Solution

    The path of motion of free electrons in a metal is zig-zag. The normal motion of “free” electrons in a conductor is random, with no particular direction or speed.

  • Question 4
    1 / -0

    In a conductor, free electrons:

    Solution

    Positive charges move from higher potential to lower potential. Negative charges move from lower potential to higher potential. Free electrons inside a conductor move towards the region of higher potential.

  • Question 5
    1 / -0

    A unit charge is moved from a point A to another point B. The work done in the process is called:

    Solution

    The potential difference between two points - point  A and point B - is the work done in moving a unit charge from point A to point B.

  • Question 6
    1 / -0

    Ohm's law is not obeyed by:

    Solution

    Many conductors do not obey ohm's law. They are known as non-ohmic conductors. For such conductors, the graph between potential difference and current is not a straight line passing through the origin. Vacuum tubes, semiconductor diodes, transistors, liquid electrolytes, thermistors, etc are examples of such conductors.

  • Question 7
    1 / -0

    Constantan or Manganin is chosen for making standard resistances because of:

    Solution

    The main feature of Constantan and Manganin is their resistivity, which is constant over a wide range of temperatures. Manganin wire is used in the manufacture of resistors, particularly ammeter shunts, because of its virtually zero temperature coefficient of resistance value and long term stability.

  • Question 8
    1 / -0

    A wire of resistance 2 Ω is bent to form a circle. What is the resistance between two diametrically opposite points?

    Solution

    When a wire of resistance2Ω is bent to form a circle, the resistance between the two diametrically opposite points can be calculated as a parallel combination of two resistors of 1Ω each. The effective resistance of the two resistors will be0.5Ω

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