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The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
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What is the difference between virtual images of an object formed by a concave mirror and a convex mirror?
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The handles of cooking utensils are made of ______.
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Heat is the transfer of energy between two objects at different temperatures.
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When ice changes into a liquid, it absorbs energy.
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When a liquid boils, energy is absorbed.
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The speed of sound is ______ in solids than in liquids
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______ is the distance between two consecutive particles.
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______ is the number of vibrations of a particle in the medium, in one second
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In any medium, as the ______ increases, the speed of sound also increases.
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the speed of sound in air is 331 ms-1 at ______ and ______ at 22°C.
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The amount of water vapour present in the air is known as ______.
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______ is the ore of iron which is the strongest natural magnet.
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Who laid the foundation for magnetism and suggested that the Earth has a giant bar magnet?
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What is the other name of lodestone?
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Mention the three types of iron ores.
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Rancidity can be prevented by ______.
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Fatty foods become rancid due to the process of ______.
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Fishes and meat containing high levels of ______.
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