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NDA Miscellaneous Test 7
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NDA Miscellaneous Test 7
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  • Question 1/5
    1 / -0.33
    Soaps are formed by saponification of______.

    Solutions
    Soaps are formed by simple esters by saponification. In the process of saponification, it converts the fat, oil, or lipid into soap by the action of heat. In this process aqueous alkali like NaOH, KOH are used for saponification.

    Aqueous alkali (Sodium hydroxide) NaOH produces hard soap.

    Aqueous alkali (Potassium hydroxide) KOH produces soft soap.

  • Question 2/5
    1 / -0.33
    The atoms of different elements that have the same mass number and different atomic number is______.

    Solutions
    Isobars are the atoms species of different elements that have the same mass number and different atomic numbers.

    Example- 18Ca40and 20Ca40

    There are many other atomic species, which are as follows- Isotopes, Isotones.

    Isotopes- The atoms having the same atomic number but different mass numbers, e.g., protium, deuterium, tritium.

    Isotones- These atoms have the same number of neutrons but different atomic numbers as well as the mass number, eg., 6C13and6N14.

  • Question 3/5
    1 / -0.33
    The scatter light beam passing through the solution and make its path visible is-

    Solutions
    The scatter light beam passing through the solution and make its path visible called the Tyndall effect. Tyndall effect is the example of a colloidal solution. Mixtures compositions of which are not uniform through are called heterogeneous mixtures. The heterogeneous mixtures containing two phases called dispersed phase and dispersion medium respectively. The dispersed phase is that which is dispersed in another substance. The substance in which the dispersed phase is dispersed is called the dispersion medium.

  • Question 4/5
    1 / -0.33
    Match List-I with List-II given below:

     List-I                      -      List-II

    1) Lactic acid             -          a. onion, garlic

    2) Benzoic acid      -             b. curd

    3) Sulphuric acid      -          c. urine

    4) Acetic acid        -                 d. vinegar

    Solutions
    Acids are in sour and turn blue litmus paper into red color. Acids are corrosive, and also gives carbon dioxide gas after reacting with metal carbonates and bicarbonates.

    Lactic acid - a natural source of this acid is found in milk.

    Benzoic acid - it is also found in beer, chewing gums, jams, cherries, etc.

    Sulfuric acid - found in grapes fruit, also in garlic, onion, etc.

    Acetic acid - manufacture from vinegar, acetate, pickles, etc.

  • Question 5/5
    1 / -0.33
    Which of the following statements regarding Ellora Caves is/are correct?

    1) These caves belong from 6th to 10th century.

    2) It has sanctuaries devoted to Buddhism, Hinduism and Jainism at one place.

    Select the correct option -

    Solutions

    • Dating back from the 6th to 10th century, the Ellora Caves comprise 34 monasteries and temples excavated side by side in the wall of a high basalt cliff.

    • Besides being an architectural marvel, the heritage site also embodies the spirit of tolerance as it has sanctuaries devoted to Buddhism, Hinduism and Jainism at one place.

    https://timesofindia.indiatimes.com/city/aurangabad/rain-water-seeps-into-prominent-jain-cave-at-ellora-damages-painting/articleshow/86403941.cms

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