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Electricity and Circuits Test - 4

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Electricity and Circuits Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    An electric bulb is marked as `100 W - 220 V`. What is the current flowing through its filament?

  • Question 2
    1 / -0

    An electric heater of 1000 watt is used for 5 hours everyday. What is the amount of electrical energy consumed in 30 days?

  • Question 3
    1 / -0

    An electric geyser draws a current of 10 amperes at 220 V. What is the cost of running it for 2 hours everyday in a month of 30 days, if the cost of electricity is Rs.1.20 per unit?

  • Question 4
    1 / -0

    Which of the following is a natural magnet?

    Solution

    A lodestone is a naturally magnetised piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron.

     

  • Question 5
    1 / -0

    Which of the following statements is NOT true?

  • Question 6
    1 / -0

    Which of the following materials are magnetic in nature?

    (i) Iron nail
    (ii) Key of a car
    (iii) Leather
    (iv) Rubber ball
    (v) Metal door handle

  • Question 7
    1 / -0

    Which of the following statements is NOT true?

    Solution

    A fuse is an electrical safety device that operates to provide overcurrent protection to an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the current. A fuse is a short piece of wire made up of a material of high resistivity and low melting point. Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s). A copper wire cannot be used as a fuse wire because it has a high melting point. It will not melt easily when a high electric current passes through it and may damage the electrical appliances.

     

  • Question 8
    1 / -0

    By which of the following devices is consumed electrical energy measured?

  • Question 9
    1 / -0

    How many types of wire do all house hold electric circuits consist of?

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