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A drinking straw works on the pressure e...

A drinking straw works on the pressure exerted by the liquid filled in a soft drink bottle in which it is placed.

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### Step-by-Step Solution: 1. **Understanding the Drinking Straw Mechanism**: - A drinking straw is a simple device used to draw liquids into the mouth. It operates based on the principles of pressure differences. 2. **Identifying the Pressure in the Bottle**: - The liquid in the soft drink bottle exerts pressure due to its weight and the atmospheric pressure acting on the liquid surface. However, this pressure alone does not cause the liquid to rise in the straw. ...
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Knowledge Check

  • Soft drinks contain:

    A
    Oxalic acid
    B
    Tartaric acid
    C
    Carbonic acid
    D
    Citric acid

  • Soft drinks contain:

    A
    Oxalic acid
    B
    Tartaric acid
    C
    Carbonic acid
    D
    Citric acid

  • Soft drinks contains

    A
    acetic acid
    B
    tartaric acid
    C
    carbonic acid
    D
    nitric acid

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    Ajay and Rakesh live in Rajgarh town of Churu districk of Rajasthan. As usual, the summer in this area of Rajasthan in extremely hot. Ajay's sister is getting engaged in the month of May, Ajay's family and relatives were waiting for the guests to arrive for the engagement ceremony. They had brought a slab of ice and put it in a tub of water for cooling the warm bottles of soft drinks. Just when they had finished drinking all the cold soft drink bottles, the gruests (including would-be bridegroom) arrive. Ajay and Rakesh were in a fix because they had only warm bottles of soft drinks left with them. Ajay suggested that they should put the warm soft drink bottles in the ice cold water which they already had in the tub but Rakesh did not agree with him Rakesh quickly brought a big slab of ice from the nearby shop crushed it well. He then put the warm soft drink bottles in an empty tub and surrounded them well with crushed ice. These warm soft drink bottles got colled in a short time and were served to the guests. All the guests enjoyed cold soft drinks on a very hot day and felt refreshed. (a) What is the temperature of water formed from freshly melted ice ? (b) What is the temperature of melting ice ? (c) A person holds some ice-old water in his left hand palm and a piece of ice in his right hand palm. Which of the two will appear to be more cold and why ? (d) Explain why, the warm drink bottles could be cooled more quickly by placing them in a tub of crushed ice than in a tub of ice cold water. (e) Can you suggest another way in which the warm soft drinks can be cooled even more quickly by using ice (than by keeping the bottles in crushed ice) ? (f) What type of change of state takes place when ice is used for cooling purposes ? What is the special name of this change of state ? (g) What values are displayed by Rakesh in the episode ?

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