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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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State two advantages of ‘the ring system of house wiring’.
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State the colour coding of wires in the flexible lead used for connecting the appliances to the mains in a house circuiting.
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Why is that the same current flowing through the bulb heats up the filament, while the leads are not heated up?
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A lady working in her kitchen received a shock from an electric hot plate. What could be the reason for the shock?
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Why is the filament in an electric bulb coiled?
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Why mica is preferred to other insulators in an electric iron?
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What will happen if switch is connected in ‘neutral wire’?
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Where is a fuse placed in an electrical circuit? Name a material suitable for making a fuse wire.
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Two fuse wires of the same lengths are rated 5A and 20A. Which of the two fuse wires is thick and why?
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State whether a magnetic field is associated or not around a static charge.
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State whether a magnetic field is associated or not around a moving charge.
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State under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be maximum.
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State under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be Zero.
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A mixture of radioactive substances gives off three types of radiation name the radiation which travels with the speed of light.
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A mixture of radioactive substance gives off three types of radiation name the radiation similar in nature to X-rays.
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