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Write main causes and effects of water pollution?

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What is meant by amplitude?

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Who proposed the Big Bang theory first?

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What is meant by light year?

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Write a short note on the Milky Way Galaxy?

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Write the features of stars?

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What is meant by infrasound waves?

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What galaxy our sun belongs to?

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How can we create waves?

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What do you know about MCB?

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Define wave?

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What is meant by Red Giant Star?

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Describe the uses of ultrasound waves?

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How can we measure frequency?

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Which devices convert electrical energy into other forms of energy?

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What is nebula?

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Why do we use three pin plugs?

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On which factors brightness of a star depends on?

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What is meant by frequency?

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What is the sound range of human ears.

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