CBSE | NCERT CLASS

Hydrocarbons A compound made up of hydrogen and carbon only is called hydrocarbon (hydrogen   +   carbon = hydrocarbon ). Example of hydrocarbons are Methane (CH4), Ethane (C2H6), Ethene (C2H4), ethyne (C2H2).

Definition: the periodic table is a chart of elements prepared in such a way that the elements having similar properties of occur in the same vertical column or group. The horizontal rows of periodic table called periods. The vertical columns of the periodic table called groups.

Definition of Dobereiner's theory law in English and Hindi When elements are arranged in the order of increasing atomic masses, groups of 3 elements (known as triads), having similar properties are obtained. The atomic mass of the middle element of the triad being equal to the Arithmetic mean of the atomic masses of the other two elements.

In NCERT solution for class 8 of science chapter 13 Sound get questions with answers, worksheet, notes etc. Question 1: Choose the correct answer: Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases. Answer 1: Sound can travel through (d) solids, liquids and gases.

In NCERT Solution of Class 8 of math chapter 7 Cube and Cube Roots get worksheet, questions answers,solve paper. Question 1: Which of the following numbers are not perfect cubes: (i) 216 (ii) 128 (iii) 1000 (iv) 100 (v) 46656

In NCERT solution for math for Set of class 11 chapter 1 get NCERT and CBSE questions,set worksheet,solve answers. Chapter 1 (Set) Exercise: 1.1 Question 1: Which of the following are sets? Justify your answer. (i) The collection of all months of a year beginning with the letter J. (ii) The collection of ten most talented writers of India. (iii) A team of eleven best-cricket batsmen of the world.

In NCERT Solution of maths of class 8 of chapter 6 Squares and Square Roots get worksheet,solve, questions and answers. Question 1: What will be the unit digit of the squares of the following numbers? (i) 81 (ii) 272 (iii) 799 (iv) 3853 (v) 1234 (vi) 26387 (vii) 52698 (viii) 99880 (ix) 12796 (x) 55555 Answer 1:  If there is m at the unit place of a number than its square has the digit in unit place of product of m × m (i) Science, 81 contain digit 1 in its unit place then its square has digit in unit place is (1 × 1)=1

In NCERT Solution of class 8 subject math chapter 2 Linear Equations in One Variable get all questions answers, notes, pdf like format.

Separation of Substances: In NCERT solution of class 6 chapter get questions answers, notes, solve paper. Question 1: Why do we need to separate different components of a mixture? Give two examples. Answer 1: We need to separate different components of a mixture because: (i) to remove an undesirable component (ii) to obtain the pure sample of a substance (iii) to remove a harmful component (iv) to obtain a useful component.

NCERT Solution: In Science of class 6 chapter 4 Sorting Materials into Group you get solution of NCERT questions answers, notes, sample questions and many more. Science Chapter 4: Sorting Materials into Group Class VI Exercise Question 1: Name five objects which can be made from wood. Answer 1: Chair, Table,Bed, Doors, wooden toys etc.