Practice test

Electricity and magnetism - Test Set 3

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

    Multimeter is used to measure the –
    1. Current
    2. Voltage
    3. Resistance
    4. All of these
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  2. Question 2

    In A.C. circuits A.C. meter measures –
    1. Mean value
    2. Rms value
    3. Peak value
    4. Root mean value
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  3. Question 3

    Which of the following instrument is used to measure the electric current:
    1. Ammeter
    2. Voltmeter
    3. Wattmeter
    4. Anemometer
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  4. Question 4

    S.I. Unit of electric charge is –
    1. Ampere
    2. Coulomb
    3. ESU
    4. Kelvin
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  5. Question 5

    Who discovered the battery?
    1. Faraday
    2. Volta
    3. Maxwell
    4. Roentgen
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  6. Question 6

    What is the unit of electric power?
    1. Watt
    2. Volt
    3. KWH
    4. Ampere
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  7. Question 7

    Alternating current is converted into direct current by using –
    1. Transformer
    2. Dynamo
    3. Rectifier
    4. Inverter
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  8. Question 8

    Fleming Right Hand Rule is used to find the direction of–
    1. Alternating current
    2. Direct current
    3. Induced current
    4. Original current
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  9. Question 9

    Instrument used to change the speed of electric fan –
    1. Amplifier
    2. Regulator
    3. Switch
    4. Rectifier
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  10. Question 10

    Best Liquid for the transformer core is–
    1. Stainless steel
    2. Cast steel
    3. Hard steel
    4. Soft iron
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  11. Question 11

    Which of the following devices is used to accelerate charged particles to high velocities?
    1. Cyclotron
    2. Copatron
    3. Cosmotron
    4. Cryotron
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  12. Question 12

    For which of the following discoveries in 1827 was the German physicist, Georg Simon Ohm best known?
    1. For developing a device capable of amplifying and modulating electromagnetic signals that could also function as an oscillator.
    2. For invention of the magnetometer, which is a device capable of measuring the direction and strength of a magnetic field.
    3. For measuring the magnetic properties of nuclear particles.
    4. For clarifying the mathematical relationship between electrical current, resistance and voltage.
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  13. Question 13

    Georg Simon Ohm was famous for publishing a formula in 1827. What does it describe?
    1. The sum of all currents entering a junction must equal the sum of all currents leaving the junction.
    2. The total electric flux through a closed surface is proportional to the charge enclosed.
    3. The current flow is proportional to potential difference and inversely proportional to resistance.
    4. The magnitude of EMF induced in the coil is directly proportional to the rate of change of magnetic flux associated with that coil.
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  14. Question 14

    Watt is a unit of ______
    1. Momentum
    2. Power
    3. Resistance
    4. Energy
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  15. Question 15

    Which of the following has the highest value of resistivity?
    1. Nichrome
    2. Silver
    3. Chromium
    4. Iron
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  16. Question 16

    In 1834, who proposed a law that states that the current induced by a change in flow opposes the effect producing the change?
    1. Heinrich Friedrich Lenz
    2. David Brewster
    3. Henry Mosley
    4. Christian Johann Doppler
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  17. Question 17

    Which of the following options is correct for Coulomb’s law?
    1. Valid for both point and distributed charges.
    2. Valid for only distributed charge.
    3. Valid for only point charge.
    4. Valid for neither point charge nor distributed charge.
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  18. Question 18

    Which of the following is the proper number of electrons in 1 A of current?
    1. 6.25 × 1031
    2. 6.25* 1018
    3. 6.25*1019
    4. 6.25*1013
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  19. Question 19

    If four resistors of 3 Ω, 4 Ω, 5Ω and 6Ω are connected in series, what will be the combined resistance of the four resistors?
    1. 3 Ω
    2. 9 Ω
    3. 18 Ω
    4. 10 Ω
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  20. Question 20

    Which of the following materials is a conductor of electricity?
    1. Silver
    2. Glass
    3. Mica
    4. Elsonite
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