CBSE ADDA

Class 07 Science Chapter Water Q. Why are we left only tiny fraction of water for use even if about 75 % of the earth surface is covered with water. Ans: This is because most of the water about 97% of surface water is in sea and ocean as salty water that is unfit for domestic and agricultural use. Q. What are the various uses of water? Ans: Water is used for various activities such as agriculture, industries, cooking, cleaning utensils, bathing, washing clothes, and, most importantly, for drinking. Q. What are the three state of water? Ans: There are three states of water a. Solid state: ice, snow and hail  b. liquid: Rain, river, sea    c. Gaseous: Water vapour Q what is water cycle? Ans: The circulation of water from atmosphere to the earth and vice versa is called the water cycle. Q.What is evaporation? Ans: The water present on the surface of the ocean evaporates by the sun’s heat. This process of conversion of water from liquid state to vapour state is called evaporati

CBSE MATH STUDY: CBSE 7th Maths Question Papers |Sample Papers 7th Ratio and Proportion Complete the following statements using the help box: 1. The comparison of two quantities of the same kind by means of division is termed as ____. 2. The two quantities to be compared are called the ________ of the ratio. 3. The first term of the ratio is called the _________ and the second term is called the _______. 4. In a ratio, only two quantities of the __________ unit can be compared. 5. If the terms of the ratio have common factors, we can reduce it to its lowest terms by cancelling the  _____. 6. When both the terms of a ratio are multiplied or divided by the same number (other than zero) the  ratio remains _________ .The obtained ratios are called__________. 7. In a ratio the order of the terms is very important. (Say True or False) 8. Ratios are mere numbers. Hence units are not needed. (Say True or False) 9. Equality of two ratios is called a ______

CBSE MATH STUDY: X Maths guess questions for CBSE board exam March ... : 1. If 4a 2 x 2 + 4abx + = 0 has equal roots of x, then find the value of k. 2. Two positive numbers differ by 3 and their product is 504. ...

CBSE MATH STUDY: X Arithmetic progression assignment :(1 to 20) Q. 1. Determine k so that k + 2, 4k - 6 and 3k - 2 are three consecutive terms of an AP. Q. 2. If m th term of A.P. is , and nth term is , s... Q. 21 How many terms of A.P. 22, 20, 18, . . . . . . . . should be taken so that their sum is zero? Q. 22 Find the sum of odd positive integers less than 199. Q. 23 How many two digits numbers between 3 and 102 are divisible by 6? Q. 24 If 7 times the 7th term is equal to 11 times the 11th term of an A.P. Find its 18th term. Q. 25 Which term of A.P. 13, 21, 29, . . . . . . will be 48 less than its 19th term? Q. 26 Find the A.P. whose 3rd term is –13 and 6th term is +2. Q. 27 Find the A.P., whose 5th term is 23 and 9th term is 43. Q. 28 The angles of a triangle are in A.P. If the smallest angle is one fifth the sum of other two angles. Find the angles. Q. 29 Aditi saved Rs. 500 in the first month of a year and then increased her monthly savings by Rs. 50. If in the nth month, her mo