Practice test

Electricity and magnetism - Test Set 5

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

    The resistance of a 200V−100W bulb is:
    1. 400
    2. 400 only when it is connected to 200 volt mains
    3. 400 when it is not glowing (d) 2
    4. None of these
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  2. Question 2

    Which one of the following is not an electromagnetic wave ?
    1. Radio wave
    2. X-ray
    3. Visible light
    4. Sound wave
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  3. Question 3

    Einstein was awarded the Nobel Prize for:
    1. Photoelectric emission
    2. Special theory relativity
    3. General theory of relativity
    4. Explanation of Brownian motion
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  4. Question 4

    When a positively charged conductor is earthed, then:
    1. Electrons flow from the conductor to the earth
    2. Protons flow from the conductor to the earth
    3. Electrons flow from the earth to the conductor
    4. Protons flow from the earth to the conductor
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  5. Question 5

    Basically, domestic electric wiring is a:
    1. Parallel connection
    2. Series connection
    3. Combination of series and parallel connections
    4. None of the above
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  6. Question 6

    LCD stands for:
    1. Liquid Crystal Display
    2. Low Current Display
    3. Light Circuit Display
    4. None of the above
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  7. Question 7

    The electric appliances in a house are connected:
    1. In series
    2. In parallel
    3. Either in series or in parallel.
    4. Both in series and in parallel.
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  8. Question 8

    Superconductors are substances which:
    1. Conduct electricity at lower temperature
    2. Offer high resistance to the flow of current
    3. Offer no resistance to the flow of current
    4. Conduct electricity at high temperature
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  9. Question 9

    If the length of the filament of a heater is reduced by 10%, the power of the heater will:
    1. Increase by about 9%
    2. Increase by about 11%
    3. Increase by about 19%
    4. Decrease by about 10%
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  10. Question 10

    A battery consists of 10 cells, each of emf 1V. If 2 cells are wrongly connected, the emf of the battery becomes:
    1. 8V
    2. 10V
    3. 6V
    4. 12V
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  11. Question 11

    Which quantity is increased in step-down transformer?
    1. Voltage
    2. Current
    3. Wattage
    4. Frequency
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  12. Question 12

    Magnetism at the centre of a bar magnet is:
    1. Minimum
    2. Maximum
    3. Zero
    4. Minimum or maximum
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  13. Question 13

    The Earth’s magnetic field:
    1. Never change
    2. Has reversed itself many times
    3. Is centered exactly at the Earth’s centre
    4. Originates in a permanently magnetized iron core
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  14. Question 14

    The magnetic length of a bar magnet means:
    1. Its total length
    2. The distance between its two poles
    3. Its width
    4. The distance of a pole from the centre
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  15. Question 15

    If a magnet is moved fast towards a coil, the induced electromotive force does not depend on:
    1. The number of turns of the coil
    2. Pole strength of the magnet
    3. The speed of the magnet
    4. The resistance of the coils
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  16. Question 16

    Which among the following is paramagnetic?
    1. H2O
    2. NO
    3. CO2
    4. SO2
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  17. Question 17

    Materials like Germanium and Silicon are called:
    1. Insulators
    2. Conductors
    3. Metals
    4. Semi-conductors
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  18. Question 18

    Instruments can be shielded from the effects of external magnetic fields by surrounding them with:
    1. A glass shield
    2. A rubber shield
    3. A brass shield
    4. An iron shield
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  19. Question 19

    At magnetic poles, the angle of dip is:
    1. 45
    2. 30
    3. 0
    4. 90
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  20. Question 20

    The purpose of choke in a fluorescent lamp is -
    1. To decrease the voltage momentarily
    2. To increase the flow of current
    3. To decrease the resistance
    4. To decrease the flow of current
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