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Name the material and type of wires for the following:
(a) Connecting wires for lighting
(b) Fuse wire
(c) Heating elements
(d) Connecting wires of a power line
(e) Earthing elements
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What is meant by a ring circuit in house wiring?
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Out of the wires- live, neutral and earthing, on which line will you connect the fuse and the switch. Give reason for your answer.
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The atomic number of a radioactive element is not changed when it emits ______.
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Live wire is also called ______ wire.
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To which wire is the metallic case of an electric appliance connected? Give the reason?
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Name the colour code of the wire which is connected to metallic body of an appliance.
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How does the colour code of wires in a cable help in house wiring?
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State Fleming’s left-hand rule.
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A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
When will coil come to rest?
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A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
When will the couple acting on the coil be
- maximum
- minimum?
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A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
Name an instrument which makes use of the principle stated above.
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A radioactive source emits three types of radiations.
Name the radiation which is most penetrating.
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A radioactive source emits three types of radiations.
Name the radiation which travels with the speed of light.
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A radioactive source emits three types of radiations.
Which radiation has zero mass?
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A radioactive source emits three types of radiations.
Name the radiation which has the lowest ionizing power.
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How γ - radiations are produced?
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