Current electricity important points copy notes Class 12 Chapter 3 Physics

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Why should a magnesium ribbon be cleaned before burning in air?

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Ques 1 : Why should a magnesium ribbon be cleaned before burning in air? Ans 1: Magnesium is very reactive metal like (Na, C a, etc.). When it expose to air it reacts with oxygen to form a layer magnesium oxide (Mg O) on its surface.                  Mg +  O 2 → 2 Mg O This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be used for the reaction. «« Chapter 1 NCERT Solution                                            Next question »»
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CHEMICAL BONDING AND MOLECULAR STRUCTURE

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                    1. Introduction Matter is made up of one or different type of elements. Under normal conditions no other element exists as an  independent atom in nature, except noble gases. However, a group of atoms is found to exist together as one species having characteristic properties. Such a group of atoms is called a molecule. Obviously there must be some force which holds these constituent atoms together in the molecules. The attractive force which holds various  constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond. Since the formation of chemical compounds takes place as a result of combination of atoms of various elements in different ways, it raises many questions. Why do atoms combine? Why are only certain combinations possible? Why do some  atoms combine while certain others do not? Why do molecules possess definite shapes? To answer such questions differen...
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Ncert Solutions Economics chapter 1 class 10 || Development Chapter 1 class 10 || Development || Economics || Social studies ||

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Ques 1. Development of a country can generally be determined by (i)  its per capita income (ii) its average literacy level (iii)  Health status of its people (iv)  all of the above Answer : (iv) all of the above   ( UNDP publishes the human development report(HDR) comparing the countries on the basis of educational level of the people, their health status and per capita income.  Ques 2. Which of the following neighbouring countries has better performance in terms of the human development than India?  (i) Bangladesh (ii) Sri Lanka (iii) Nepal (iv) Pakistan Answer : (ii) Sri Lanka ,  HDI(human development index) of Sri Lanka is 73 which is much higher than the Bangladesh, Nepal and  Pakistan which have 139,145 and 147 respectively.  Ques 3. Assume there are four families in a country. The average per capita income of these families is Rs 5000. If the income of three families are Rs 4000, Rs 7000 and Rs 3000 respecti...
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Changing Trends And Career in Physical Education Solutions || Objective Type Questions || Objective Answers Chapter 1 Class 11 Solution || Physical Education ||

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Ques 1: “Physical Eduction is the sum of changes in an individual caused by experience centring motor activity” Who said this? (a) Prince martin  (b) Millions (c) Charls A.Butchar  (d) Cassidy Ans :  (d) Cassidy Ques 2: “Physical Education is the sum of men’s physical activities selected as to kind and conducted as to outcomes” who said this? (a) C.C.Covel  (b) Charls A Butcha (c) Williams  (d) J.B. Nash Ans :  (c) Williams Ques 3 : How many objectives of physical Education are there? (a) Four  (b) Five (c) Three  (d) Six Ans : (b) Five Ques 4 : What is the aim of physical Education? (a) Physical development  (b) Motor development (c) Mental Development  (d) All Round development Ans : (d) All Round development Ques 5: Sports management is based upon....? (a) Efficient and Talented officials  (b) Smart and clever officials (c) Weak and Greedy officials  (d) None of these  Ans : (a) Efficient and Talented of...
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