Tag: chemistry in daily life

Quizzes (9) Questions (159)

Questions Related to chemistry in daily life

Multiple choice chemistry in daily life satellite launch vehicles rocket propellants

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 : 

  1. $M _0$
  2. $M _0+\cfrac{\Delta m}{\Delta t}$
  3. $M _0-\cfrac{\Delta m}{\Delta t}$
  4. $M _0-\cfrac{\Delta m}{\Delta t}t$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mass of the rocket decreases over time as fuel is expelled. If mass delta m is expelled in time delta t, the rate of mass loss is delta m / delta t. After time t, the mass lost is (delta m / delta t) * t.

Multiple choice chemistry in daily life satellite launch vehicles rocket propellants

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

  1. linear momentum

  2. energy

  3. angular momentum

  4. mass
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. 550

  2. 100

  3. 600

  4. 2000
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

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
  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)
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

Which of the following is a food antioxidant?

  1. Butylated hydroxytoluene (BHT)

  2. Butylated hydroxyanisole (BHA)

  3. Saccharin

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

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

  1. Aspartic acid

  2. Alanine

  3. Serine

  4. Phenylalanine

  5. Tryptophan
Reveal answer Fill a bubble to check yourself
A,D Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.