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Define ultrasound waves?

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What are spiral galaxies?

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Why do we use telescope?

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Define liquid fertilizers?

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Write a short note on CCD readers. 29. How do we change the display of doc

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When total internal reflection takes place?

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Define valancy with example?

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What is contellation?

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What are the temperatures of coolest and hottest stars?

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How wave travel from one place to another?

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What are the types of waves?

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How does current flows?

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Which stars are known as massive stars?

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What is meant by fertilizers?

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State the laws of refraction?

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What are the effects of an electric current? Explain

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What is thermal energy ?

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Define chemical formula?

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What are the types of electric circuits?

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Which important points should be kept in mind in order to delete text?

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