Answer: C) Both A & B Explanation: Covalent bonds hold atoms together because the attraction between the positively charged nuclei and the negatively charged shared electrons is greater than the repulsions between the nuclei themselves.

Answer: B) 14 Explanation: Given Number series is :   3   4   14   48   576   27648   It follows a pattern that,   3   4   4 x 3 = 12   but not 14   12 x 4 = 48   48 x 12 = 576   576 x 48 = 27648       Hence, the odd one in the given Number Series is 14.

Answer: A) Jeff Bezos Explanation: Jeff Bezos is the richest person in modern history. The Amazon.com Inc. founder’s net worth broke $150 billion in New York on 16th July 2018 morning, according to the Bloomberg Billionaires Index.       That’s about $55 billion more than Microsoft Corp. co-founder Bill Gates, the world’s second-richest person.

Answer: A) Dn = log 2 (n+1) Explanation: A complete binary tree is a binary tree where all the levels have maximum number of nodes except possibly the last level.   The depth of complete binary tree of n nodes will be Dn=log 2 (n+1) where Dn is the height or depth of the tree and n is the number of nodes.

Answer: A) Germany and Austria Explanation:

Answer: C) Wasshing soda Explanation: Hardness can be removed by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.   Hardness in water is caused by dissolved magnesium ions and calcium ions. These can get into the water when it comes into contact with limestone and other rocks that contain calcium compounds. This can happen, for example, when rainwater flows over these rocks on its way to a reservoir.   Hardness in water is of two types. They are : 1. Temporary hardness 2. Permanent hardness   1. Temporary hardness:: Temporary hardness is caused by dissolved calcium hydrogen carbonate. 2. Permanent hardness:: Permanent hardness is caused by dissolved calcium sulfate. Unlike temporary hardness, it is not removed by boiling the water.

Answer: A) 1951609 Explanation: 1397 x 1397

A line is an undefined term because of it :   1. Contains an infinite number of points 2. can be used to create other geometric shapes 3. is a term that does not have a formal definition   In Geometry, unless it's stated, a line will extend in one dimension and goes on forever in both ways.