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Burning of thread in the candle gives li...

Burning of thread in the candle gives light but not wax.

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A hydrogen gas-filled jar is held with its mouth downwards. A lighted candle is taken into the jar. The candle gets extinguished but the gas burns with a pop sound. What does this experiment show?

An invertad glass jar is placed over a burning candle. After a while, the candle is removed and the inverted glass jar is placed in a through in a trough of water. What do you obseve and justify your observetions.

Knowledge Check

  • to burn the candle at both ends

    A
    to spend cautiously
    B
    to be stingy
    C
    work hard
    D
    to survive difficulty

  • There are two candles of same length and same size.both of them burn at uniform rate. The frist one burns in 5 hours and the second one the second one burns in 3 hours. Both the candles are lit together. After many minutes the length of the first candle is 3 times is 3 times that of the other ?

    A
    90
    B
    120
    C
    135
    D
    150

  • A candle of 6 cm long burns at the rate of 5 cm in 5 h and another candle of 8cm long burns at the rate of 6 cm in 4 h. What is the time required by each candle to remain of equal lengths after burning for some hours, when they starts to burn simultaneously with uniform rate of burning?

    A
    1h
    B
    1.5h
    C
    2h
    D
    none of these

    • Similar Questions

    Explore conceptually related problems

    An inverted glass jar is placed over a burning candle. After a while, the candle is removed and the inverted glass jar is placed in a trough of water. What do you observe and justify your observations.

    Why is burning of a candle involves both physical and chemical change?

    A candle of 6 cm long burns at the rate of 5 cm in 5 h and another candle of 8 cm long burns at the rate of 6 cm in 4 h. What is the time required by each candle to remain of equal lengths after burning for some hours, when they start to burn simultaneously with uniform rate of burning?

    A flame is the visible gaseous part of a fire. It is a zone of combustion of gaseous substances accompanied by evolution of heat and light. All substances do not burn with a flame. Only those substances that vaporise during burning produce flame. A candle flame is taken to study the various zones of a flame. Which zone of a candle flame is the zone of no combustion?

    Assertion (A): Burning of candle is a physical change. Reason (R ): In physical change, no new substance is formed.

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