MCQ
The hearing range of human ear is
- ✓$20\ Hz$ to $20,000\ Hz$
- Bless than $20\ Hz$
- Cmore than $20,000\ Hz$
- D$20\ Hz$ to $25,000\ Hz$
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Column I
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Column II
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$(A)$
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A non-metal, essential for respiration
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$(i)$
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Graphite
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$(B)$
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A non-metal, the source of energy in Sun
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$(ii)$
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Silicon
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$(C)$
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A non-metal, good conductor of electricity
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$(iii)$
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Oxygen
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$(D)$
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A non-metal, used in semiconductors
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$(iv)$
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Hydrogen
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