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Electric Current and its Effects Test - 2

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Electric Current and its Effects Test - 2
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following is an essential element in an electric circuit ?

    Solution
  • Question 2
    1 / -0

    The magnetic effect of the current was discovered by _ ? 

    Solution
  • Question 3
    1 / -0

    Which of the following materials is a conductor?

    Solution

    That substance that passes electricity are called conductor. Silver is good conductor of electricity.

  • Question 4
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    Which of the following is the best option while considering the safety of household electric appliances ? 

    Solution
  • Question 5
    1 / -0

    Electric current is measured by a device

    Solution

    An ammeter is a device which is used to measure the amount of current flowing through a circuit.. It is always connected in series.

  • Question 6
    1 / -0

    Compact fluorescent lamps (CELs) are considered better than ordinary electric bulbs because ?

    Solution
  • Question 7
    1 / -0

    A device which prevents or allows the current to flow through it

    Solution

    An electric switch is a device for making and breaking the connection in an electric circuit. 
    If a switch is open, no current flows through that path (ie it is off). If the switch is closed, current is allowed to flow (the path is on).

  • Question 8
    1 / -0

    Electric current is the flow of

    Solution

    Electric current is the flow of negatively charged electron from higher potential to lower potential.

  • Question 9
    1 / -0

    When an electric current passes through a solenoid, it acts as a/an 

    Solution
  • Question 10
    1 / -0

    MCB in electric circuit stand for

    Solution

    Miniature Circuit Breaker (MCB) is a kind of switch that automatically turns off in the case of short circuit or overloading of current. 

  • Question 11
    1 / -0

    The device used to make or break an electric circuit is : 

    Solution
  • Question 12
    1 / -0

    Electrons are ___________ particles.

    Solution

    Electrons are negatively charged particles. Charge of an electron is 1.60217662 × 10-19 coulombs. For calculation purpose  we use 1.6× 10-19 coulombs.Electrons revolve around in nucleus in a definte path called as orbits Electrons play an essential role in physical phenomena such as electricity, magnetism and thermal conductivity.They also participate in gravitational,electromagnetic and weak interactions.

  • Question 13
    1 / -0

    Magnetic effect of electric current was observed by

    Solution

    Hans Christian Øersted was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism.

  • Question 14
    1 / -0

    A ____________ is used in torches.

    Solution

    A dry cell is a type of battery used for portable electrical devices such as torches,radios,TV remote controls etc.

  • Question 15
    1 / -0

    Filament of electric bulb is made up of

    Solution

    Filament of electric bulb is made up of tungsten wire, an alloy of metals having very high melting point.

  • Question 16
    1 / -0

    Electromagnet is used in

    Solution

    An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring.

  • Question 17
    1 / -0

    Fuse wire is made up of alloys of

    Solution

    Fuse wire is made up  of an  alloy of tin and lead with a very low melting point.This fuse wire melt quickly and break when large  electric currents are passed through them  

  • Question 18
    1 / -0

    Which of the following acts as safety device in electric appliances ? 

    Solution
  • Question 19
    1 / -0

    Which of the following dose not use magnetic effect of electric current ? 

    Solution
  • Question 20
    1 / -0

    Electromagnet loses its magnetic property when

    Solution

    Electromagnet  shows magnetic properties only as long as the electric current flows through its coil.

  • Question 21
    1 / -0

    The strength of the magnetic field due to a solenoid can be increased by 

    Solution
  • Question 22
    1 / -0

    Electromagnet is based on

    Solution

    Electromagnet is a magnet that works as magnet in presence of current only. It is based on magnetic effect of electric current.

  • Question 23
    1 / -0

    Electric current is said to be pass through a wire when

    Solution

    The flow of electrons through a conductor (such as metal wire) gives rise to electric current. 

  • Question 24
    1 / -0

    When two or more cells are joined together it forms a

    Solution

    When we connect two or more cells in such a way that the positive terminal of one cell is connected to the negative terminal of the next cell,such a combination of two or more cells is called a battery  

  • Question 25
    1 / -0

    The unit to measure electric resistance is : 

    Solution
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