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,

Fruits stored in a cold chamber exhibit longer storage life because

(a)

exposure to sunlight is prevented

(b)

concentration of carbon dioxide in the environment is increased

(c)

rate of respiration is decreased

(d)

there is an increase in humidity

Correct Answer

(c)

Explanation

Respiration can be controlled by refrigerated storage.

Microtheme: Chemistry —
15 questions asked in Prelims in the past.

  1. [2025] Consider the following:
    I. Cigarette butts
    II. Eyeglass lenses
    III. Car tyres
    How many of them contain plastic?

    • (a) Only one
    • (b) Only two
    • (c) All the three
    • (d) None
    Correct Answer: (C) All the three
  2. [2021] Water can dissolve more substances than any other
    liquid because

    • (a) it is dipolar in nature
    • (b) it is a good conductor of heat
    • (c) it has high value of
    • (d) it is an oxide of hydrogen
    Correct Answer: (A) it is dipolar in nature
  3. [2014] Which of the following is/are the example/examples of chemical change?
    1. Crystallization of sodium chloride
    2. Melting of ice
    3. Souring of milk
    Select the correct answer using the code given below:

    • (a) 1 and 2 only
    • (b) 3 only
    • (c) 1, 2 and 3 only
    • (d) None of the above
    Correct Answer: (B) 3 only
  4. [2013] Fruits stored in a cold chamber exhibit longer storage life because

    • (a) exposure to sunlight is prevented
    • (b) concentration of carbon dioxide in the environment is increased
    • (c) rate of respiration is decreased
    • (d) there is an increase in humidity
    Correct Answer: (C) rate of respiration is decreased
  5. [2011] Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use?

    • (a) Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in the human body due to lack of requisite enzymes.
    • (b) When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation.
    • (c) Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories.
    • (d) Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation.
    Correct Answer: (D) Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation.
  6. [2010] Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps ?

    • (a) A mercury coating on the inside of the lamp makes the light bright white
    • (b) When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations
    • (c) When the lamp is switched on, it is the mercury which converts the ultra-violet energy into visible light
    • (d) None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps
    Correct Answer: (B) When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations
  7. [2010] Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to

    • (a) the formation of hydrochloric acid when chlorine is added to water
    • (b) the formation of hypochlorous acid when chlorine is added to water
    • (c) the formation of nascent oxygen when chlorine is added to water
    • (d) the formation of hydrogen when chlorine is added to water
    Correct Answer: (B) the formation of hypochlorous acid when chlorine is added to water
  8. [2010] If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:

    • (a) Potato is mainly made up of starch whereas paper is mainly made up of cellulose
    • (b) Potato transmits microwaves whereas paper reflects microwaves
    • (c) Potato contains water whereas paper does not contain water
    • (d) Potato is a fresh organic material whereas paper is a dead organic material.
    Correct Answer: (C) Potato contains water whereas paper does not contain water
  9. [2009] Which one of the following is used as an explosive ?

    • (a) Phosphorous Trichloride
    • (b) Mercuric Oxide
    • (c) Graphite
    • (d) Nitroglycerine
    Correct Answer: (D) Nitroglycerine
  10. [2008] What are rubies and sapphires chemically known as?

    • (a) Silicon dioxide
    • (b) Aluminum oxide
    • (c) Lead tetroxide
    • (d) Boron nitride
    Correct Answer: (B) Aluminum oxide
  11. [2008] Which one of the following is also called Stranger Gas?

    • (a) Argon
    • (b) Neon
    • (c) Xenon
    • (d) Nitrous oxide
    Correct Answer: (C) Xenon
  12. [2008] Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?

    • (a) Hydrogen and oxygen
    • (b) Oxygen and acetylene
    • (c) Methane and air
    • (d) Carbon dioxide and methane
    Correct Answer: (C) Methane and air
  13. [2008] Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

    • (a) Lithium and mercury
    • (b) Lithium and osmium
    • (c) Aluminum and osmium
    • (d) Aluminum and mercury
    Correct Answer: (B) Lithium and osmium
  14. [2008] What is the pH level of blood of a normal person?

    • (a) 4.5-4.5
    • (b) 6.45-6.55
    • (c) 7.35-7.45
    • (d) 8.25-8.35
    Correct Answer: (C) 7.35-7.45
  15. [2003] Regarding the atom of a chemical element, the magnetic quantum number refers to:

    • (a) Orientation
    • (b) Shape
    • (c) Size
    • (d) Spin
    Correct Answer: (A) Orientation