Please select a subject first
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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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Show the path of a ray of light when it travels from air into water, the angle of incidence being 30°. Mark the angle of incidence and the corresponding angle of refraction.
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How are the refractive index of water-related to the real depth and the apparent depth of a column of water?
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With the help of a well-labelled diagram show that the apparent depth of an object, such as a coin, in water is less than its real depth.
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Why is the heating coil placed in a circular porcelain plate in an electric stove?
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