Practice test

Electricity and magnetism - Test Set 4

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    Which device is used to either break an electric circuit or to complete it?
    1. Insulators
    2. Wires
    3. Switch
    4. Bulb
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  2. Question 2

    Identify the correct statement.
    1. Resistance of a wire depends on the length and density of the wire.
    2. Specific resistance is the same for all conductors.
    3. Resistance of a wire depends on the length and cross-section of the wire.
    4. Specific resistance is dependent on the cross-sectional area of the wire.
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  3. Question 3

    A light bulb working on a 18V battery draws a current of 3A. What will be the resistance of the bulb?
    1. 6 Ω
    2. 2 Ω
    3. 4 Ω
    4. 3 Ω
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  4. Question 4

    If Q = net charge, t= time, then which of the following equations is correct
    1. I=Q/t
    2. Q=I/t
    3. I = Q × t
    4. T=Q×I
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  5. Question 5

    Whose law states that at a junction in an electric circuit, the sum of the currents flowing into the junction is equal to the sum of the currents flowing out of the junction?
    1. Michael Faraday
    2. Georg Simon Ohm
    3. Victor Francis Hess
    4. Gustav Robert Kirchhoff
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  6. Question 6

    Whenstone bridge is an arrangement of ______ resistors used for accurate measurement of resistance.
    1. 3
    2. 6
    3. 5
    4. 4
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  7. Question 7

    Which of the following statements is correct regarding fuse wire?
    1. It has a low melting point and low conductivity.
    2. It has a high melting point and low conductivity.
    3. It has a low melting point and high conductivity.
    4. It has a high melting point and high conductivity.
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  8. Question 8

    Why do atoms and nonpolar molecules have no dipole moment?
    1. Because their electronic charge cloud is missing.
    2. Because their electronic charge cloud is scattered.
    3. Because their electronic charge cloud is asymmetrically distributed.
    4. Because their electronic charge cloud is symmetrically distributed.
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  9. Question 9

    The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
    1. 48 J
    2. 12 J
    3. 36 J
    4. 24 J
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  10. Question 10

    What is the coil of wire in the electric room heater known as?
    1. Cell
    2. Fuse
    3. Switch
    4. Element
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  11. Question 11

    The internal resistance of which of the instruments is the highest?
    1. Galvanometer
    2. Ammeter
    3. Voltmeter
    4. Mili ammeter
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  12. Question 12

    A. C is converted to D.C. by:
    1. Rectifier
    2. Dynamo
    3. Transformer
    4. Motor
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  13. Question 13

    The emf of a cell does not depend on:
    1. The size of the cell
    2. The material of cathode
    3. The material of anode
    4. Electrolyte used
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  14. Question 14

    How many times will the equivalent resistance of n identical conductors be changed if their parallel arrangement is changed into a series one:
    1. n
    2. n2
    3. n3
    4. n4
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  15. Question 15

    What is increased in the stepdown transformer?
    1. Voltage
    2. Current
    3. Wattage
    4. Current density
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  16. Question 16

    If the length and cross-section of a Wire are both doubled, the resistance will:
    1. Increase 4 times
    2. Decrease 5 times
    3. Increase twice
    4. Remain unchanged
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  17. Question 17

    The current on a 100W, 200V electric bulb is?
    1. 2.2 amp
    2. 2.3 amp
    3. 5/11 amp
    4. 22000 amp
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  18. Question 18

    The specific resistance of a conductor depends on its:
    1. Length
    2. Width
    3. Temperature
    4. Shape of the cross-section
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  19. Question 19

    In a p-type semiconductor, which is the main carrier of electricity ?
    1. Positive holes
    2. Positive ions
    3. Electrons
    4. Negative ions
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  20. Question 20

    The motion of which particle through a metallic wire is called electric current ?
    1. Electron
    2. Positron
    3. Neutron
    4. Photon
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