Maths class 9 cbse


1

1033

December 24, 2020

Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent? Arrange the substances with polar covalent bonds in order of increasing bond polarity:


0

1731

May 29, 2020

Factorise: 250(ab)^3+2


1

290

June 19, 2019

Prove (a+b+c)^3  a^3  b^3  c^3 = 3(a+b) (b+c) (c+a)


1

121

June 19, 2019

If a+b+c = 0, then prove that (b+c)^2 / 3bc + (c+a)^2 / 3ca + (a+b)^2 / 3ab = 1


1

614

June 18, 2019

If a+b = 12 and ab= 27, find the value of a^3+b^3


1

181

June 18, 2019

If A,B,C are all non zero and A+B+C = 0 Prove that A2/BC + B2/CA + C2/AB = 3


1

292

June 18, 2019

Prove that (a+b+c)3 –a^3b^3c63= 3(a+b)(b+c)(c+a)


1

233

June 18, 2019

Factorise: x^3 + 13x^2 + 32x + 20


1

110

June 18, 2019

Represent root 5 on number line


1

467

June 18, 2019

If a+b+c=5,and ab+bc+ca=10,prove a^3+b^3+c^33abc=25


1

455

June 17, 2019

Prove that (a+b+c)whole cube  a cube b cube  c cube = 3(a+b)(b+c)(c+a )


1

4628

June 17, 2019

The blood groups of 30 students of class VIII are recorded


1

210

April 12, 2019

Eleven bags of wheat flour, each marked 5 kg, actually contained the following weights of flour


1

345

April 12, 2019

Activity : Ask all the students in your class to write a 3digit number


1

574

April 10, 2019

Activity: Note the frequency of twowheelers, threewheelers and fourwheelers going past


1

496

April 10, 2019

The distance (in km) of 40 engineers from their residence to their place of work were found


1

127

April 10, 2019

To know the opinion of the students about the subject statistics, a survey of 200 students


1

201

April 10, 2019

A teacher wanted to analyse the performance of two sections of students in a mathematics test


1

420

April 10, 2019

An organisation selected 2400 families at random and surveyed them to determine


1

384

April 10, 2019

Three coins are tossed simultaneously 200 times with the following frequencies


1

462

April 10, 2019

In a particular section of class IX, 40 students were asked about the month of their birth


1

286

April 10, 2019

1500 families with 2 children were selected randomly, and the following data were recorded


1

549

April 10, 2019

In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays


1

227

April 10, 2019

Give one example of a situation in which (i) the mean is an appropriate measure of central tendency


1

301

April 10, 2019

Find the mean salary of 60 workers of a factory from the following table


1

435

April 10, 2019

Find the mode of 14, 25,14, 28,18,17,18,14, 23, 22,14 and 18


1

391

April 10, 2019

The following observations have been arranged in ascending order


1

283

April 10, 2019

In a mathematics test given to 15 students, the following marks (out of 100) are recorded


1

430

April 10, 2019

The following number of goals were scored by a team in a series of 10 matches


1

578

April 10, 2019
