Tag: chemistry in daily life

Questions Related to chemistry in daily life

Suppose a rocket with an initial mass $M _0$ expels a mass $\delta m$ in the form of gases in time $\Delta t$, then the mass of the rocket after time t is : 

chemistry in daily life satellite launch vehicles rocket propellants

  1. $M _0$

  2. $M _0+\cfrac{\Delta m}{\Delta t}$

  3. $M _0-\cfrac{\Delta m}{\Delta t}$

  4. $M _0-\cfrac{\Delta m}{\Delta t}t$

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Correct Option: D

The propulsion of a rocket is based on the principle of conservation of

chemistry in daily life satellite launch vehicles rocket propellants

  1. linear momentum

  2. energy

  3. angular momentum

  4. mass

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Correct Option: A
Explanation:

The rocket propulsion is based on the principle of linear momentum conservation as initially the rocket is at rest but when the rocket is ready to take off the the momentum of small mass of gas ejected at high speed is compensated by increased momentum of the rocket with the remaining fuel.

The sweeteners value of aspartame in comparison to cane sugar is:

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. 550

  2. 100

  3. 600

  4. 2000

Show answer
Correct Option: B
Explanation:
  • Sugar substitutes are substances that are used in place of sweeteners with sugar (sucrose) or sugar alcohols. They may also be called artificial sweeteners.
  • Natural sweeteners add to calorie intake and therefore many people prefer to use artificial sweeteners.
  • Aspartame is the most successful and widely used artificial sweetener. It is roughly 100 times as sweet as cane sugar. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine. Use of aspartame is limited to cold foods and soft drinks because it is unstable at cooking temperature.

Which of the following is not a food additive?

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. Preservatives

  2. Sweetening agents

  3. Flavours

  4. Oxidants

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Correct Option: D
Explanation:

Antioxidants are added to food to prevent it from spoiling.

Name an artificial sweetener which is derivative of sucrose.

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. Saccharine

  2. Sucrolose

  3. Sucrobenzamide

  4. Aspartame

Show answer
Correct Option: B
Explanation:

Surolose is trichloro derivative of sucrose. Its appearance and taste are like sugar.

Match the column I with column II and mark the appropriate choice.

Column I Column II
(A) Alitame (i) Antihistamine
(B) Iodoform (ii) Artificial sweetener
(C) Prontosil (iii) Antibacterial agent
(D) Terfenadine (iv) Antiseptic
chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. (A) $\rightarrow$(i), (B) $\rightarrow$(ii), (C) $\rightarrow$(iv), (D) $\rightarrow$(iii)

  2. (A) $\rightarrow$(ii), (B) $\rightarrow$(iv), (C) $\rightarrow$(iii), (D) $\rightarrow$(i)

  3. (A) $\rightarrow$(iii), (B) $\rightarrow$(i), (C) $\rightarrow$(ii), (D) $\rightarrow$(iv)

  4. (A) $\rightarrow$(iv), (B) $\rightarrow$(iii), (C) $\rightarrow$(i), (D) $\rightarrow$(ii)

Show answer
Correct Option: B
Explanation:
  • Antiseptics are applied to the living tissues such as wounds, cuts, ulcers and diseased skin surfaces. Iodoform is used as an antiseptic for wounds.
  • Alitame is high potency Artificial sweetener, the control of sweetness of food is difficult while using it.
  • Prontosil, also called sulfamidochrysoidine, trade name of the first synthetic drug used in the treatment of general bacterial infections in humans.It is an Antibacterial agent.
  • Antihistamines interfere with the natural action of histamine by competing with histamine for binding sites of receptor where histamine exerts its effect.Synthetic drugs, brompheniramine (Dimetapp) and terfenadine (Seldane), act as antihistamines.

Which of the following is a food antioxidant?

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. Butylated hydroxytoluene (BHT)

  2. Butylated hydroxyanisole (BHA)

  3. Saccharin

  4. Both A and B

Show answer
Correct Option: D
Explanation:
Butylated hydroxytoluene is  an organic compound primarily used as an antioxidant food additive.

Butylated hydroxyanisole (BHA) is an antioxidant consisting of a mixture of two isomeric organic compounds, 2-tert-butyl-4-hydroxyanisole and 3-tert-butyl-4-hydroxyanisole.

Saccharin is an artificial sweetener.

Option D is correct.

Name two $\alpha$-amino acids, which form a dipeptide, which is 100 times more sweet than cane sugar?

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. Aspartic acid

  2. Alanine

  3. Serine

  4. Phenylalanine

  5. Tryptophan

Show answer
Correct Option: A,D
Explanation:

Aspartame is the artificial sweetener, which is 100 times more sweet than cane sugar. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine.

Aspartame is unstable at cooking temperature. Where would you suggest aspartame to be used for sweetening?

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. Soft drinks

  2. Cold drinks

  3. Both of them

  4. None of these

Show answer
Correct Option: C
Explanation:

Aspartame is unstable at cooking temperature, hence it can used in soft drinks and cold drinks for artificial sweetening.

Non-degradable and fat-soluble pollutant, such as DDT enters the food chain, the pollutant:

chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

  1. magnifies in concentration at each trophic level

  2. degrades at first trophic level

  3. accumulates in the body fat of organism at the first trophic level and does not pass to second trophic level

  4. decreases in concentration at each trophic level

Show answer
Correct Option: A
Explanation:
Biomagnification is the accumulation or increasing concentration of lipophilic pesticides in the top members of the food chain. 
During biomagnification, the concentration of non-degradable pesticide like DDT goes on increasing along the food chain and highest values occur in the consumers of the top trophic level. So, the value of pesticide will go on increasing at each trophic level. 

Thus, the correct answer is option A.