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While cooking, if the bottom of the vess...

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that

A

the food is not cooked completely

B

the fuel is not burning completely

C

the fuel has high calorific value

D

the fuel is burning completely.

Text Solution

Verified by Experts

The correct Answer is:
B
Due to incomplete combustion of fuel, the unburnt carbon particles are deposited at the bottom of the vessel
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One day Anita was standing in the kitchen and talking to her mother who was cooking vegetables in a stainless steel untensil. Anita observed that the bottom of cooking utensil was getting blackened from outside. She showed this to her mother. The mother told Anita that the bottoms of all the cooking utenisls kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X Anita checked the gas stove thoroughly and could under-stand the reason for this problem. She explained everything to her mother. As Anita was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Anita's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. (a) Why is the bottom of cooking utensil kept on burning gas stove getting blackene? Explain. (b) Apart from blackening the bottom of cooking utensils state two other disadvantages of using gas stove in this condition. (c) What did Anita find on checking the gas stove throughly which was causing this problem? (d) What step Anita might have asked her mother to take to get rid of this problem? (e) What type of flame was produced by the gas stove burner after the required step was taken by Anita's mother?Why? (f) What values are displayed by Anita in this episode?

Knowledge Check

  • While cooking, if the bottom of the vessel is getting blackend on the outside, it means that:

    A
    the food is not cooked completely.
    B
    the fuel is not burning completely.
    C
    the fuel is wet.
    D
    the fuel is burning completely.

  • A vessel of height 2d is half-filled with a liquid of refractive index sqrt(2) and the other half with a liquid of refractive index n. (The given liquids are immiscible). Then the apparent depth of the inner surface of the bottom of the vessel (neglecting the thickness of the bottom of the vessel) will be

    A
    `(n)/(d(n+sqrt2))`
    B
    `(d(n+sqrt2))/(nsqrt2)`
    C
    `(nsqrt2)/(d(n+sqrt2))`
    D
    `(nd)/(d+sqrt(2n))`

  • Small blood vessel may get blocked in infection of

    A
    Plasmodium ovale
    B
    P. vivax
    C
    P. malariae
    D
    P. falciparum.

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