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Option: C
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Option: B
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Option: A
Explanation :China launch its own digital currency and by doing this, he is becoming the first country in the world to issue its Central Bank Digital Asset.
According to Huang Qifan Executive Vice President of the China International Economic Exchange Centre, the currency will be named DCEP (Digital Currency Electronic Payment).
He made the announcement at the inaugural Bund Summit, which held from 27th to 29th October 2019. He said that the People’s Bank of China has been working on rolling out the cryptocurrency for the past 5-6 years.
China’s digital currency has similarities to Facebook’s currency Libra and crypto currencies like Bitcoin. Like those forms of payment, the Chinese currency will be stored in a digital wallet.

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Option: C
Explanation :Your blood type is determined by the antigens it contains. There are two major types of blood antigens: ABO and Rh, which combine to create blood types: O+. O-, A+, A-, B+, B-, AB+ & AB-
A patient can receive blood that has the same ABO antigens as theirs, plus O. Rh+ can receive Rh+ or Rh-, while Rh- must receive Rh- blood.
If your blood type is: O Positive You can give to: O+, A+, B+, AB+ You can receive from: O+, O-
If your blood type is: A Positive You can give to: A+, AB+ You can receive from: A+, A-, O+, O-
If your blood type is: B Positive You can give to: B+, AB+ You can receive from: B+, B-, O+, O-

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Option: D
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Option: B
Explanation :Black board is group/category of Visual-aids teaching-aids. Teaching aids are the tools that teachers use them in classroom such as flash cards, maps, cassette, and black board. A Teacher aid is a tool used by teachers to help learners improve reading and other skills, fact or idea, and relieve anxiety, fears, or boredom since many teaching aids like games.
There are three types/group/category of teaching aids
i) Audio Aids
ii) Visual Aid
iii) Audio-Visual Aid
i) Audio Aids:- Audio Aids enhance the listening and communication skills of the learners. This teaching type help those students who are auditory learners. Audio aids have audio contents like gramophone, radio, teleconferencing, and tape recorders etc.. These audio contents helps students to develop their mental powers and hearing powers by listening audio contents.
ii) Visual Aid:- Learning through visual representation is called visual aids. Visual aids have contents that we can see with our eyes. One of the most important category or type of teaching aid that teachers always use in their teaching-learning process like blackboard, chalk, duster, picture, map, graphs, charts, posters, museums, and projectors

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Option: D
Explanation :Emotional Adjustment of students is effective in personality formation, class teaching, discipline.

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Option: A
Explanation :Ptyalin is an enzyme that is part of your saliva and aids with digestion. Enzymes are compounds that help speed up chemical reactions. In the case of saliva, the enzymes help speed up reactions that break down the food you eat. Even before food makes it to your stomach it begins to break down, and enzymes help make the process go smoothly.
Ptyalin helps digestion by breaking down starches and glycogens as they enter your mouth. After the starches and glycogen are covered with saliva, they are broken down into maltose and glucose — simple sugars that can be used more readily by the body. After the ptyalin speeds up the chemical reaction that breaks down these molecules, it simply unbinds from them and binds to a different set of molecules. Ptyalin can be used again and again, and this is what allows us to continue eating starches and glycogen.

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Option: C
Explanation :In the 1960s a second type of polio vaccine, known as oral poliovirus vaccine (OPV) or Sabin vaccine, named for its inventor American physician and microbiologist Albert Sabin, was developed. OPV contains live attenuated (weakened) virus and is given orally.

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Option: A
Explanation :Polio vaccine, preparation of poliovirus given to prevent polio, an infectious disease of the nervous system. The first polio vaccine, known as inactivated poliovirus vaccine (IPV) or Salk vaccine, was developed in the early 1950s by American physician Jonas Salk. This vaccine contains killed virus and is given by injection. The large-scale use of IPV began in February 1954, when it was administered to American schoolchildren. In the following years, the incidence of polio in the United States fell from 18 cases per 100,000 people to fewer than 2 per 100,000.
Jonas Salk became a national hero when he allayed the fear of polio with his vaccine, approved in 1955. Although it was the first polio vaccine, it was not to be the last; Albert Sabin introduced an oral vaccine in the 1960s that replaced Salk’s.

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