As electrons pass through a bulb, they use

  • energy
  • charge
  • power
  • resistance

Fuses work only

  • in daylight
  • twice
  • once
  • in moonlight

When small hammer is attracted by electromagnet, the bell

  • sparks
  • vibrates
  • stops
  • strucks

William Sturgeon made first electromagnet in

  • 1820
  • 1825
  • 1920
  • 1925

The electromagnet consists of a coil of wire with

  • steel magnet in it
  • iron magnet in it
  • steel magnet above it
  • iron magnet below it

In parallel circuit, the current is

  • equal
  • unequal
  • more powerful
  • less powerful

In conductors, electrons can flow because their

  • ions are free
  • protons are free
  • electrons are free
  • negative ions are free

Poor conductor of electricity is

  • silver
  • aluminum
  • water
  • copper

Earth wire is connected to the

  • ground
  • appliance
  • power house
  • transformer

Another example of 'electromagnets' in trains is

  • bullet train
  • passenger train
  • maglev train
  • cargo train

Turning off a switch also put the bulb off, this is because the circuit is

  • cooled down
  • not complete
  • joined
  • unbroken

'Earphones' are

  • magnets
  • small loudspeakers
  • soft speakers
  • magnetized speakers

In 1 minute, 1kW electric fire uses 10 times as much energy as a

  • 1W LED light
  • 10W LED light
  • 100W bulb
  • 0.1W RC Car

Electrons release energy in the form of

  • heat energy
  • thermal energy
  • sound energy
  • light energy

An instrument that gives an accurate measurement of the electric current flowing in a circuit is known as

  • voltmeter
  • galvanometer
  • barometer
  • ammeter

A magnet may attract or repel by

  • another magnet
  • electric current
  • resistor
  • dynamo

Compared to long thick wire of copper, the short but thick wire would have

  • more resistivity
  • less resistivity
  • equal resistivity
  • may have more or less resistivity

Current can only flow if there is a closed circuit

  • open circuit
  • closed circuit
  • series circuit
  • parallel circuit

If someone carrying a knife or gun passes through a detector, it alters the rate of

  • current
  • voltage
  • resistance
  • magnetic field

Electrolysis is also used to purify

  • sodium
  • copper
  • silver
  • potassium

The electrolyte used in the purification of copper is

  • copper nitrate
  • copper chloride
  • copper sulphate
  • copper carbonate

The strength of electromagnet can be increased by introducing a soft iron core

  • outside the coil
  • inside the coil
  • round the coil
  • above the coil

For current to flow, the circuit should be

  • parallel
  • in series
  • complete
  • hot

Electric companies charge for

  • energy
  • power
  • resistance
  • units

When the switch is turned off, the iron bar

  • holds its magnetism
  • loses its magnetism
  • gains current
  • gains voltage

Charges in an atom are

  • positive only
  • negative only
  • neutral
  • both positive and negative

In our daily life, we find most of the compounds contain

  • sodium
  • chlorine
  • oxygen
  • hydrogen

A current carrying conductor has a

  • magnetic field
  • current capacity
  • voltage capacity
  • resistance capacity

The more the resistors to a circuit, the

  • lower the resistance
  • higher the resistance
  • same the resistance
  • resistance may vary

Electricity is formed by

  • positively charged ions
  • negatively charged ions
  • electrons
  • protons
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