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  <!-- Chapter 1: Physical Quantities and Measurements -->
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  <!-- Chapter 2: Motion -->
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  <!-- Chapter 3: Force -->
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  <!-- Chapter 5: State of Matter and Pressure -->
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  <!-- Chapter 6: Effect of Heat on Matter -->
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  <!-- Chapter 7: Waves and Sound -->
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  <!-- Chapter 8: Reflection of Light -->
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  <!-- Chapter 9: Refraction of Light -->
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