MCQ
Burning of candle is a:
- APhysical change.
- BChemical change.
- CPeriodic change.
- ✓Both $(a)$ and $(b).$
During burning of candle carbon dioxide gas and water vapours are formed therefore it is a chemical change. Also burning of candle result in melting of wax is a physical change.
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$(i)$
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$(a)$ It is a natural fibre. - Go to $(ii)$
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$(b)$ It is a man-made fibre. - $[P]$
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$(ii)$
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$(a)$ Fibre is obtained from plants. - Go to
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$(b)$ Fibre is obtained from animals. - Go to $(iv)$
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$(iii)$
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$(a)$ Fibre obtained from stem. - $[O]$
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$(b)$ Fibre obtained from seed. - $[R]$
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$(iv)$
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$(a)$ Fibre obtained by harming source organism - $[S]$
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$(b)$ Fibre obtained without harming source organism. - $[T]$
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S.No.
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Column-I (Name of gas in Air)
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S.No.
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Column-II (% age of gas in air)
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$A.$
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Oxygen
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$(p)$
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$20\%$
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$B.$
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Nitrogen
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$(q)$
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$79\%$
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$C.$
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Carbon dioxide
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$(r)$
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$0.04\%$
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$D.$
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Other gases
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$(s)$
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Less than $1\%$
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