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Doctors Medicines MCQs Q&A

Which of the following statements is/are correct? 1. Detergents are cleaning agents which work both in hard water as well as ice-cold water. 2. Synthetic detergents are mainly classified into two categories: Anionic detergents and Cationic detergents. Select the correct answer using the code given below.

Which of the following statements is/are correct? 1. Detergents are cleaning agents which work both in hard water as well as ice-cold water. 2. Synthetic detergents are mainly classified into two categories: Anionic detergents and Cationic detergents. Select the correct answer using the code given below. Correct Answer 1 only

The correct answer is 1 only.

Key Points

  • Synthetic detergents are cleansing agents that have all the properties of soaps, but which actually do not contain any soap. 
  • These can be used both in soft and hard water as they give foam even in hard water. Some of the detergents give foam even in ice-cold water. Hence, Statement 1 is correct.
  • Synthetic detergents are mainly classified into three categories: Anionic detergents, Cationic detergents, and Non-ionic detergents Hence, Statement 2 is incorrect. 
  • The main problem that appears in the use of detergents is that if their hydrocarbon chain is highly branched, then bacteria cannot degrade this easily.
  • Slow degradation of detergents leads to their accumulation.
  • Effluents containing such detergents reach the rivers, ponds, etc. These persist in water even after sewage treatment and cause foaming in rivers, ponds, and streams, and their water gets polluted.
  • These days the branching of the hydrocarbon chain is controlled and kept to the minimum.
  • Unbranched chains can be biodegraded more easily and hence pollution is prevented

Related Questions

Assertion (A) Synthetic detergents can lather well in hard water.
Reason (R) Synthetic detergents form soluble calcium and magnesium salts with hard water.
Assertion (A) : Synthetic detergents can lather when in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.
Assertion (A) : Synthetic detergents can lather when in hard water.
Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.
Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. Many farmers use synthetic pesticides to kill infesting insects. The consumption of pesticides in some of the developed countries is touching 3000 grams/hectare. Unfortunately, there are reports that these compounds possess inherent toxicities that endanger the health of the farm operators, consumers and the environment. Synthetic pesticides are generally persistent in environment. Entering in food chain they destroy the microbial diversity and cause ecological imbalance. Their indiscriminate use has resulted in development of resistance among insects to insecticides, upsetting of balance in nature and resources of treated populations. Natural pest control using the botanical pesticides is safer to the user and the environment because they break down into harmless compounds within hours or days in the presence of sunlight. Plants with pesticidal properties have been in nature for millions of years without any ill or adverse effects on the ecosystem. They are easily decomposed by many microbes common in most soils. They help in the maintenance of biological diversity of predators and human health hazards. Botanical pesticides formulated from plants are biodegradable and their use in crop protection is a practical sustainable alternative. On the basis of the above passage, the following assumptions have been made: 1. Synthetic pesticides should never be used in modern agriculture. 2. One of the aims of sustainable agriculture is to ensure minimal ecological imbalance. 3. Botanical pesticides are more effective as compared to synthetic pesticides. Which of the assumptions given above is/are correct?
Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. Many farmers use synthetic pesticides to kill infesting insects. The consumption of pesticides in some of the developed countries is touching 3000 grams/hectare. Unfortunately, there are reports that these compounds possess inherent toxicities that endanger the health of the farm operators, consumers and the environment. Synthetic pesticides are generally persistent in environment. Entering in food chain they destroy the microbial diversity and cause ecological imbalance. Their indiscriminate use has resulted in development of resistance among insects to insecticides, upsetting of balance in nature and resources of treated populations. Natural pest control using the botanical pesticides is safer to the user and the environment because they break down into harmless compounds within hours or days in the presence of sunlight. Plants with pesticidal properties have been in nature for millions of years without any ill or adverse effects on the ecosystem. They are easily decomposed by many microbes common in most soils. They help in the maintenance of biological diversity of predators and human health hazards. Botanical pesticides formulated from plants are biodegradable and their use in crop protection is a practical sustainable alternative. Which of the following statements is/are correct regarding biopesticides? 1. They are not hazardous to human health. 2. They are persistent in environment. 3. They are essential to maintain the biodiversity of any ecosystem. Select the correct answer using the code given below.
You are given a question and two statements. Idientify which of the statements is/are sufficient to answer the question. Question: In a city, some people travel to work by bus, some people travel to work by train, some people travel to work by both bus and train, and some travel to work neither by bus, nor by train. The number of people who travel to work by both bus and train is how much less than the number of people who travel to work by neither? Statements: (1) In the city, there are 384 people who travel to work by bus. (2) In the city, there are 672 people who travel to work by train,
Given below are two quantities named 1 and 2. Based on the given information, you have to determine the relationship between the two quantities. You should use the given data and your knowledge of Mathematics to choose between the possible answers. Quantity 1: P and Q can do a work in 6 days and Q and R can do a work in 60/7 days and P and R can do a work in 20/3 days. If Q and R work for first 2 days and left the work. Find the total time taken by P to complete the remaining work. Quantity 2: A and B can do a work in 8/3 days, B and C can do the same work in 3 days and A and C can do the same work in 24/5 days. In what time C alone can complete the work?
In this question, a statement is given followed by four conclusions. Choose the conclusion(s) which best fit(s) logically. Statement: To pass the examination, one must work hard. Conclusions: I. Examination is related to only hard work. II. All those who do not work hard pass. III. Without hard work, one does not pass. IV. Hard-working person is a satisfied person.
In the following question, two statements are numbered as A and B. On solving these statements, we get quantities A and B respectively. Solve both quantities and choose the correct option. Quantity A: 20% of students prefer to speak both English and Hindi while 40% of students prefer to speak Hindi and 55% of students prefer to speak English. 1300 students don’t prefer to speak both English and Hindi. Find the difference between the number of students who speak only English and only Hindi. Quantity B: 10 men can complete the work in 20 days while 30 women can complete the work in 40 days. If 8 men and 30 women started the work and they work for 8 days then left the work. The remaining work will be completed by a certain number of women in 57.6 days. Find the number of women who completed the remaining work.
In the following question, two statements are given each followed by two conclusions I and II. You have to consider the statements to be true even if theyseem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statement:
(I) If we are lucky then things automatically fall in place.
(II) Luck follows only when we work hard.
Conclusions:
(I) Hard work is the key to success.
(II) If you dont work hard, luck will not follow you.