Introduction To Chemistry : Selina Concise Class 6 Chemistry Inside Question Answer
Selina Concise Chemistry Class 6 Inside Based Question Paper with All Answer. Now of days for ICSE Class 6 Students, it is not enough to Learn only Exercise Questions Answers. As because most of the time Examiners will give Inside Question Answer from that respective Chapter. So Here in this page Our Experts provided All Selina Concise Class 6 Chemistry Inside Questions & Answers – Introduction To Chemistry. Selina Concise Class 6 Chemistry Extra Questions and Answers.
(1.) WHAT IS SCIENCE? HOW MANY BRANCHES IN SCIENCE?
ANS:- Science is the systematic, ongoing effort by human beings to study, understand for meaningful purposes. This understanding is slowly developed by careful observations and experiments.
Science is broadly classified into three main branches. That’s are- i) Physics ii) Chemistry iii) Biology.
(2.) WRITE THE NAME OF THE FERTILISERS WHICH ARE USED IN CROPS?
ANS:- Urea, Sodium nitrate, ammonium phosphate, calcium nitrate.
(3.) WRITE THE NAME OF PESTICIDES WHICH USED TO KILL PESTS?
ANS:- Malathion, Parathion, aldrin etc.
(4.) WRITE THE NAME OF COSMETICS WHICH USE IN PAARTS OF HUMAN BODIES?
ANS:- The name of cosmetics are- lipsticks, deodorants, lotions, perfumes, bathing oil, baby products etc.
(5.) WHAT IS TALC?
ANS:- Talcum powder is made up of a mineral called talc. It contains elements loke magnesium, silicon and oxygen.
(6.) WHAT IS THE CONTRIBUTION OF CHEMISTRY IN COMMUNICATION DEVICES?
ANS:- Synthetic chemicals, metallic wires and plastics used in telephones, mobile phones, transistors etc are all gifts of chemistry.
(7.) WRITE THE FULL FORM OF TNT, RDX,DDT,BHC.
ANS:- TNT- Tinitro tolune. RDX- Rapid detonating explosive. DDT- Dichlorodiphenyl trichloro ethane. BHC- Benzene hexachloride.
(8.) WHAT IS ENZYMES?
ANS:- Our body is a mobile chemical factory that uses food, water, oxygen as a raw materials. These sunstances undergo a series of changes with the help of chemicals called enzymes that are secreted our bodies.
(9.) WRITE THE UTILITY OF HCL IN HUMAN BODY.
ANS:- HCL is a strong acid. It is produced in our stomach that helps in the digestion of food.
(10.) WRITE SOME CHEMICALS WHICH WE GET IN FOOD.
ANS:- Chemicals are- Carbohydrates, proteins, vitamins, minerals etc.
(11.) WHO DISCOVERED THE RADIOACTIVITY?
ANS:- Marie Curie.
(12.) WHO DISCOVERED ‘ PERIODIC LAW’?
ANS:- Russian chemist Dmitri Mendeleev discovered periodic table.
(13.) WHAT IS THE CONTRIBUTION OF ANTONIE LAVOISIER IN CHEMISTRY?
ANS:- Antonie Lavoisier revolutionized chemistry. He named the elements carbon, hydrogen and oxygen and discovered the role of oxygen in combustion and respiration for which he is most noted. He established that water is a compound and helped to continue the transformation of chemistry from a qualitative science to a quantitative One.