The work of an electric generator is to:
The work of an electric generator is to:
(i) Change chemical energy to electrical energy.
(ii) Change mechanical energy to electrical energy.
(iii) Change electrical energy to mechanical.
(iv) Change electrical energy to chemical energy.
Ans: – Option (ii).
Appliance that works on the principle of electromagnetic induction.
(i) Electric kettle (ii) Electric bell
(iii) Electric lamp (iv) Electric generator.
Ans: – Option(iv).
Electric fuse should have the following combination of melting point and resistance:
(i) high resistance and low melting point
(ii) low resistance and high melting point.
(iii) high resistance and high melting point
(iv) Low resistance and low melting point.
Ans: – Option(i).
Which principle states that by changing magnetic field, current produced:
(i) Coulombs law
(ii) Magnetic behaviour of a solenoid
(iii) Electromagnetic induction
(iv) Ohms.
Ans: – Option(iii).
Appliance that converts high voltage to low voltage is:
(i) Step up transformer
(ii) Step down transformer
(iii) Rectifier
(iv) Amplifier.
Ans: – Option(ii).
Fuse wire is made up of
(i) Silicon and Tin alloy
(ii) Tin coated with zinc
(iii) tin coated with nickel
(iv) Tin coated with aluminium.
Ans: – Option(i).
According to Flemmings left hand rule the force acting on the current carrying conductor is:
(i) Parallel to magnetic field and current flow.
(ii) Perpendicular to magnetic field and current flow.
(iii) Parallel to magnetic field but perpendicular to the direction of current flow.
(iv) Perpendicular to magnetic field but parallel to direction of current flow.
Ans: – Option(ii).
Which wire saves appliances from damage among those that come into our homes?
(i) Phase (ii) Neutral
(iii) Earth (iv) None of the above.
Ans: – Option(iii).
Give the three reasons of accident caused by electricity.
Ans: – The reason of accident caused by electricity is –
- Touched the phase line.
- After touching weigh hand.
Name one of the tools used to check the current in wire and commonly used in home and industry.
Ans: – Short circuit is used in checking the current in wire.
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