MCQs and tricks for competition exam.

  Cube root  If we remember the cube of numbers from 1 to 10, then we will be able to find the cube root of numbers up to 100000 very easy i.e. in few seconds.  The cube of the numbers from 1 to 10 is:-  1³ = 1  2³ = 8  3³ = 27  4³ = 64  5³ = 125  6³ = 216  7³ = 343  8³ = 512  9³ = 729  10³ = 1000  Q. 1.  Find the cube root of 97,336.  Solution:- Unit digit -6  Hence the unit digit of the required number is 6.  ( 216= 6³)  Now, 97  -----  (distinguish 336)  The perfect cube number below 97 is 64 which is the cube of 4. Hence tens digit = 4   Cube root of 97,336 = 46  Q.2.  Find the cube root of 2744 .  Solution:  2  744  unit digit = 4  cube number below 2 = 1 Cube root of 1 = 1  ∴  1  4  Ans: 14  If the unit digit of the number is 8 then the unit digit of its cube root will be 2. And if the unit digit of the numbe...

  1.  During the electrolysis of Cu₂SO₄ (Copper Sulphate)  substance deposited at the anode:-  A. Hydrogen  B. copper  C. Oxygen  D. sulphate  Ans: C. Oxygen  2. Which of the following solution does not conduct electricity:-  A. Urea  B. Benzene  C. sugar  D. all three  Ans: D. All three  3.The material on which the electroplating is to be done, that material is made of:-  A. Anode  B. cathode  Ans: B. Cathode  4. On electrolysis of sodium chloride, Na⁺ ions will be deposited in:-  A. cathode  B. anode  Ans: A. Cathode  5. Electric current flows in an electrolytic material:-  A. By electrons.  B. by protons.  C. by neutrons.  D. by ions.  Ans: D. By ions.  6. The total charge  of 1 mole of electrons is equal to:-  A. 96000 faraday  B. 69600Faraday  C. 96500 Faraday  D. 96700 Faraday  Ans: C. 96500 Faraday  7. ...

 • Top MCQ Q&A Notes related to pH which is very important for various competitive exams.  1. What is the pH value :-  A. negative log value of oxygen ion concentration.  B. negative log value of OH-  ion concentration.  C. Negative log value of hydrogen ion concentration.  D. negative log value of nitrogen ion concentration.  Ans: C. Negative log value of hydrogen ion concentration.  2. The range of pH value is :-  A. 0 to 14  B. 0 to 7  C. 0 to 10  D.  7 to 14  Ans : A. 0 to 14   3. The pH  value of an acid is :-  A. 0  B. 7  C. more than 7   D. less than 7  Ans: D. Less than 7  4. The pH  value of alkali is :-  A.  14  B.  more than 7  C. less than 7  D.  0  Ans : B. More than 7  5. What is the pH value of neutral solution :-  A. 7  B. 14  C. 0   D. 1  Ans : A. 7  6. How much ch...