All questions of One Word for Class 10 Exam

Answer: B - DemographyThe study of human population with the help of the records of the number of births and deaths is called Demography. Here's a brief explanation:- Demography is a social science that deals with the statistical study of human populations, their size, composition, and distribution across space and time.- It involves the collection and analysis of data related to birth rates, death rates, migration, and other demographic trends.- Demographers use this information to understand the dynamics of population growth and decline, and to make predictions about future trends in population changes.- This information is crucial for policymakers, economists, public health officials, and urban planners, among others, as it helps them make informed decisions about resource allocation, social services, and economic development.

Answer: A. ChromaticsThe art of making fireworks is called Chromatics. This term refers to the science and art of creating colorful displays using various chemical compounds and pyrotechnic techniques. Here's a breakdown of the options given:- Chromatics: The science and art of creating colorful displays, such as fireworks, using chemical compounds and pyrotechnic techniques.- Cosmogony: The study of the origin and development of the universe or a specific cosmological system.- Cosmography: The science that describes the structure, composition, and distribution of the main celestial bodies in the universe.- Cosmology: The branch of science that deals with the study of the origin, evolution, and eventual fate of the universe.In conclusion, the correct answer is A. Chromatics, as it is the term that specifically relates to the art of making fireworks.

Explanation:

Altruista is a word that comes from the Spanish language and means "altruist" in English. An altruist is a person who has an unselfish concern for the welfare of others. In other words, an altruist is someone who puts the needs of others before their own needs. Let's break down the options given in the question to understand why the correct answer is option 'C'.

a) One who is a lover of beauty: This option refers to a person who appreciates and loves beauty. However, it has nothing to do with being an altruist.

b) One who never stops: This option does not make sense in the context of the word "altruista". It is not related to the meaning of the word.

c) A lover of mankind: This option is the correct answer. An altruist is someone who loves humanity and is concerned about the well-being of others. An altruist is willing to make sacrifices for the benefit of others.

d) A person who hates mankind: This option is the opposite of the correct answer. An altruist is someone who loves mankind, not someone who hates it.

In conclusion, the correct option that best explains the given word "altruista" is "a lover of mankind" because an altruist is someone who puts the needs of others before their own needs and cares about the well-being of others.

Answer: C - An expert judgeExplanation:A connoisseur is someone who has a deep understanding, knowledge, and appreciation of a particular subject, often related to arts, food, or wine. They are considered expert judges in their field due to their extensive experience and refined taste. Key features of a connoisseur include:- Expertise: A connoisseur possesses a high level of knowledge and skill in their area of interest.- Discernment: They can make fine distinctions and evaluations, often noticing subtle differences that others may overlook.- Appreciation: They have a genuine love and admiration for the subject matter, which drives their passion for learning and sharing their knowledge.- Reputation: Connoisseurs are often respected and sought after for their opinions and recommendations by others who share their interests.

Explanation:Ambidextrous refers to the ability of an individual to use both their left and right hands with equal ease and skill. This term is often used to describe people who can perform tasks like writing, drawing, or playing sports with either hand proficiently. The correct option is:C: One who can use either hand with ease.

The technique of communication by signs made with the fingers is called:DactylologyExplanation:- Dactylology is a system of communication that involves the use of finger and hand movements to represent words, letters, or ideas.- It is often used by individuals who are deaf or hard of hearing, but it can also be utilized in situations where speaking aloud is not possible or appropriate.- Examples of dactylology include American Sign Language (ASL), British Sign Language (BSL), and finger-spelling alphabets.

Alchemy

Alchemy was a philosophical and protoscientific tradition that aimed to transform base metals into noble metals, discover a universal panacea, and find a way to extend human life. The term "alchemy" comes from the Arabic word al-kīmiyāʾ, which means "the art of transformation." Alchemy was practiced in various cultures throughout history, including ancient Egypt, Greece, China, and India, during the medieval and Renaissance periods, and into the 18th century.

Some key features of alchemy include:

- The belief in the transmutation of metals, especially the transformation of base metals into noble metals like gold and silver
- The search for a universal panacea, or cure-all, that could heal any disease or prolong life indefinitely
- The use of complex symbols, allegories, and mystical language to describe chemical processes and philosophical concepts
- The incorporation of spiritual, religious, and philosophical ideas into the practice of chemistry, such as the idea of the four classical elements (earth, air, fire, and water) and the belief in the philosopher's stone, a legendary substance that could transmute metals and grant eternal life.

Although alchemy is often associated with pseudoscience and magical thinking, it also contributed to the development of modern chemistry in a number of ways. Alchemists developed new techniques for distillation, sublimation, and crystallization, as well as new equipment such as retorts and alembics. They investigated the properties of various substances, such as acids, bases, and salts, and discovered new compounds such as sulfuric acid and nitric acid. They also laid the groundwork for the scientific method by emphasizing the importance of observation, experimentation, and hypothesis testing.