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Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air.
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Name two gases that are mainly responsible for acid rain.
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In the following statement, the underlined words are jumbled up. Write them in their correct form.
Carbon dioxide, thaneme, nitrous oxide and water vapour are known as heengrouse sesga.
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Rayon is a fibre obtained by the chemical treatment of wood pulp.
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A liquid fuel, used in homes is ______.
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Fuel must be heated to its ______ before it starts burning.
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Give reasons.
LPG is a better domestic fuel than wood.
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Name the unit in which the calorific value of a fuel is expressed.
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What is menstruation? Explain.
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Reproductive age in women starts when their ______.
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Sprinkling of powder on the carrom board ______ friction.
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Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
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Differentiate between regular and diffused reflection.
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Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.
Polished wooden table
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Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.
Chalk powder
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Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.
Cardboard surface
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Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.
Marble floor with water spread over it
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Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.
Mirror
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