## The mean of the data x1, x2, x3, …………… x10 is 20 then the mean of (x1 + 4) , (x2 + 4) , (x3 + 4) , …………(x10 + 4) will be a) 20 b) 24 c) 40 d) 10 ( WBBSE – 2019 )

The mean of the data x1, x2, x3, …………… x10 is 20 then the mean of (x1 + 4) , (x2 + 4) , (x3 + 4) , …….(x10 + 4) will be a) 20 b) 24 c) 40 d) 10 Answer : b) 24 Explaination : Mean of the Read more…

## The variables x1, x2, x3, ______, x100 are in ascending order of their magnitude, then the median of the variable is ______. ( WBBSE – 2019 )

The variable x1, x2,x3, ………….,x100 are in ascending order of their magnitude, then the median of the variable is ______. Answer: ( x50+x51 )/2 Explanation: Number of variables (x) = 100 ∴ Median = 1/2 [ (x/2)th+(x/2+1)th ] =1/2 [ (100/2)th+(100/2+1)th ] =1/2 [ 50th+51th ] =1/2 ( x50+x51 ) Read more…

## Only one circle can be drawn through three non-collinear points. ( WBBSE – 2019 )

Write true or false : Only one circle can be drawn through three non-collinear points. Answer : True Explanatation : Through 3 non-collnear points, only one triangle can be drawn. Hence, only one circumcircle can be drawn. Therefore, the given statement is true. International English Olympiad Workbook -Class 5  (114) Read more…

## sin 30º + sin 60º > sin 90º ( WBBSE – 2019 )

Write true or false : sin 30º + sin 60º > sin 90º Answer : True Explanation : LHS = sin 30º + sin 60º = 1/2 +√3/2 = 1 + √3/2 = 1 + 1.732/2 = 2.732/2 = 1.366 RHS = sin 90º = 1 ∴ LHS > RHS Read more…

## If tan∝ + cot∝ = 2, then the value of tan13∝ + cot13∝ is ______.

If tan∝ + cot∝ = 2, then the value of tan13∝ + cot13∝ is ______. a) 13 b) 2 c) 1 d) 0 Answer : b ) 2 Explaination : Given : tan∝ + cot∝ = 2 ⇒ tan∝ + 1/tan∝=2 ⇒ tan2∝ + 1/tan∝ = 2 ⇒ tan2∝ + 1 Read more…

## Reflection of Light, Class – 10 Physics

Introduction : In our daily life, we observe different phenomena of light. But we can neither see nor touch the light. Actually, light is a very peculiar substance. Many scientists had researched the nature and properties of light. Finally, it is known that light has a dual nature that is Read more…

## Appearance of ‘X’ Chromosome & its Byproduct ‘Y’ Chromosome

As a consequence of transmutation of the internal motion, with the division of cell, reproductive potential, and capability appears (not gender division indeed). That itself, in the terminology of a genome, can be briefed as “X Chromosome“. That means, at the beginning of the origination of the organism, relating with Read more…

## Biological Stage in the Evolution of Universe

The process of transmission of the Universal Energy into the matter has its ‘Biological Stage” – least micro unit being DNA (Life Force). Because of the heat of Sun, some planets are visible as ‘inert’ and some are visible as ‘with life’. After the formation of planets, at some point Read more…

## Characteristics of Bio-Matter on Planets Versus Satellites

In accordance with the level of concentration (centralization) of attraction and repulsion of the magnetic field relating to the surface of Sun in the solar unit (solar system) and center of planets, so also, surface of planets and centers of the satellites – the characteristics (quantities and qualities) of Bio-matter Read more…

## Evolution of Organisms – their Growth & Development from Single Cell

On “Evolutionary Transmutation“, unicellular organisms appeared from the Bio-matter. Thereafter, multi-cellular organisms, different species of those multi-cellular organisms, and finally there was appearance of human species. In multi-cellular organisms, initially “Aquatic Animals” (first dimension) appeared, followed by Amphibians (second dimension), and finally Mammals (beyond second dimension; human beings between 2 Read more…