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Electricity Test - 26

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Electricity Test - 26
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  • Question 1
    1 / -0
    A material that lets electricity to pass through it is called a/an-
    Solution
    An electrical conductor is a substance in which electrical charge carriers, usually electrons, move easily from atom to atom with the application of voltage. Conductivity, in general, is the capacity to transmit something, such as electricity or heat. ... Copper, steel, gold, aluminum, and brass are good electric conductor.
  • Question 2
    1 / -0
    Heat produced in a resistor when current is passed through it depends upon-
    Solution
    $$Power=i^2R$$
    and $$Energy=Heat=Power\times time=I^2Rt$$
  • Question 3
    1 / -0
    Which one of the following substances are used to make electric switches and switch boards?
    Solution
    Insulators are used to make electric switches and switch boards. An insulator is a substance that does not conduct electrical current. Hence, to prevent incidents of electric shock , such a material is used to make switches and switch boards.
  • Question 4
    1 / -0
    Which of the following does not belong to the group formed by the others?
    Solution
    Glass is an insulator while others (iron, tin, steel) are conductors.
  • Question 5
    1 / -0
    Which of the following does not belong to the group formed by the others?
    Solution
    Except wood all are good conductors whereas wood is an insulator.
    Good conductors are those materials that allow electricity to pass through them easily. Bad conductors are those materials that do not allow electricity to pass through them easily.
  • Question 6
    1 / -0
    Electric heaters used for cooking have the filament or the heating coil on a plate made up of clay because
    Solution
    Clay is a bad conductor of heat and electricity. It is a ceramic material, with good mechanical and chemical bonds throughout the cross-section that transfer heat through conduction to the interior. Therefore, the Electric heaters used for cooking have the filament or the heating coil on a plate made up of clay 
  • Question 7
    1 / -0
    The device used to generate large amount of electricity is
    Solution
    Electric generator is used to generate large amount of electricity. 
    • Electric cells and storage batteries generate electricity only in the order of tens of volts.
    • Similarly, solar cell generate a very low voltage. They need to be used in large numbers.
    • Whereas an electric generator can generate thousands of volts.
  • Question 8
    1 / -0
    Find the odd man out.
    Copper, Aluminium, Iron, Wood, Brass.
    Solution
    Wood is a bad conductor of electricity. Rest are good conductors of
    electricity.
  • Question 9
    1 / -0
    Find odd one out:
    Copper, Salt water, Cotton, Human body.
    Solution
    Cotton is an insulator, rest are good conductors.
  • Question 10
    1 / -0
    A substance that allows electricity to pass through it, is called ______

    Solution
    Electrical conductors have free electrons in there outermost shell giving them the property of movement of electrons within the conductor structure and that movement of electrons is also called as current Hence, Electrical conductors provides easy passage to the electrons. Hence A option is correct
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