Tag: evs - i

Questions Related to evs - i

What is the hard top part of the earth called?

evs - i earth as a planet spheres of earth earth and structure introduction to the spheres of the earth

  1. Hydrosphere

  2. Lithosphere

  3. Biosphere

  4. Atmosphere

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Correct Option: B

Sphaira means _____.

evs - i earth as a planet spheres of earth earth and structure introduction to the spheres of the earth

  1. Ball

  2. Water

  3. Stone

  4. Life

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Correct Option: A
Explanation:

"Litho" is from the Greek word lithos, meaning stone. "Sphere" is from the Greek word sphaira, meaning globe or ball. The solid outer crust of any celestial body can also be called the lithosphere.

______ means stone or rock.

evs - i earth as a planet spheres of earth earth and structure introduction to the spheres of the earth

  1. Hydro

  2. Litho

  3. Sphaira

  4. Bios

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Correct Option: B

Fermentation was discovered by:

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. Vant Hoff and Le Bell.

  2. Louis Pasteur.

  3. Berzelius.

  4. Kolbe.

Show answer
Correct Option: B
Explanation:

Louis Pasteur discovered fermentation.


 In 1860, he demonstrated that bacteria cause souring in milk, a process formerly thought to be merely a chemical change, and his work in identifying the role of microorganisms in food spoilage led to the process of pasteurization.

 Option B is correct.

$NaCl$ is used as a food preservative and in freezing mixtures.

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. True

  2. False

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Correct Option: A
Explanation:

Bacteria cannot survive in salt conditions as water is completely extracted by salt due to its hygroscopic nature.

Therefore, $NaCl$ is used as a food- preservatives and in freezing mixtures.
So the given statement is true.

Which one of following is employed as a tranquilizer ?

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. Chlorpheninamine

  2. Equanil

  3. Naproxen

  4. Tetracycline

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Correct Option: B
Explanation:

Equanil is a diasaccharide [Everday life]

Milk can be preserved by adding a few drops of:

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. formic acid solution

  2. formaldehyde solution

  3. acetic acid solution

  4. acetaldehyde solution

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Correct Option: A
Explanation:

Formic acid $\Rightarrow H - \overset{O}{\overset{||}{C}} - OH$
Formic acid is used to preserve Milk.

Muddy water can be purified through coagulation by using :
evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. $\text{common slat}$

  2. $\text{alums}$

  3. $\text{sand}$

  4. $\text{lime}$

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Correct Option: B
Explanation:

Muddy water can be purified through coagulation by using alums. 


It is added to the water so that the negatively charged colloidal particles clump together into Flocks which then float to the top of the liquid settle to the bottom of the liquid, or can be more easily filtered from the liquid, prior to further filtration and disinfection of the water.

Which of the following are used as food preservative?

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. Table salt

  2. Sodium hydrogen carbonate

  3. Cane sugar

  4. Benzoic acid

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Correct Option: A,C
Explanation:
A preservative is a substance that is added to products such as foods, pharmaceuticals, paints, biological samples, wood, etc. to prevent  decomposition by microbial growth or by undesirable chemical changes.

Food preservation usually involves preventing the growth of bacteria,fungi (such as yest), or other microorganisms (although some methods work by introducing benign bacteria or fungi to the food), as well as retarding the oxidation of fats that cause rancidity.

The earliest cultures have used sugar as a preservative, and it was  commonplace to store fruit in honey. Similar to pickled foods, sugar cane was brought to Europe through the trade routes. In chemical pickling, the food is placed in an edible liquid that inhibits or kills bacteria and other micro-organisms. Typical pickling agents include  table salt.

Hence A & C are correct options.

Assertion: All chemical added to food items are called food preservatives.
Reason: All the chemicals increase the nutritive value of the food.

evs - i methods of preserving food food spoilage and food preservation chemicals in food food chemistry

  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

  2. Both Assertion and Reason are correct but Reason is NOT the correct explanation for Assertion.

  3. Both Assertion and Reason are incorrect.

  4. Assertion is correct but Reason is incorrect.

  5. Assertion is incorrect but Reason is correct.

Show answer
Correct Option: C
Explanation:

Various chemicals are added to food. They are called food additives and are flavours and sweeteners, food colours (dyes), fat emulsifiers and stablising agents, flour improvers antistaling agents and bleaches, antioxidants, preservatives and nutritional supplements.
Thus, only few chemicals added to food items are called food preservatives.
and Only few chemicals increase the nutritive value of the food.
Hence, both Assertion and Reason are incorrect.