###### Class 10 Physics Tutorials

## 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 Read more…

###### Class 10 Maths Tutorials

## 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) Read more…

###### Class 10 Maths Tutorials

## 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 [ Read more…

###### Class 10 Chemistry Tutorials

## 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 Read more…

###### Class 10 Maths Tutorials

## 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 Read more…

###### Class 10 Maths Tutorials

## Value of median of date 2, 3, 9, 10, 9, 3, 9, is 10 . ( WBBSE – 2019 )

Write true or false : Value of median of date 2, 3, 9, 10, 9, 3, 9, is 10 . Answer : False Explanation : Ascending order : 2, 3, 3, 9, 9, 9, 10 . Number of variables (n) Read more…

###### Class 10 Maths Tutorials

## Number of surfaces of a solid right circular cylinder is ______. ( WBBSE – 2019 )

Number of surfaces of a solid right circular cylinder is _______. Answer : 03 Explaination :

###### Class 10 Maths Tutorials

## The simplest value of cos53˚/sin37˚is ______. ( WBBSE – 2019 )

The simplest value of cos53˚/sin37˚is ______. Answer: 1 Explanation: cos53˚/sin37˚= cos(90-37)/ sin37˚ [ ∵ 53+37=90 ⇒ 53 = 90-37 ] = sin37˚/sin37˚ [ ∵ cos(90-θ) = sinθ ] = 1

###### Class 10 Maths Tutorials

## If the bases of two triangles are situated on same line and other vertex of the two triangles are common, then the ratio of the areas of two triangles ______to the ratio of their bases.

If the bases of two triangles are situated on same line and other vertex of the two triangles are common, then the ratio of the areas of two triangles ______to the ratio of their bases. Answer: equal Explanation: Area of Read more…

###### Class 10 Physics Tutorials

## Refraction of Light, Class – 10 Physics

Introduction : In our dailylife, we may observe that the path of the rays of light have been bent when the these go from one medium at the separation of the two media. A man sees a fish under water. Read more…

###### Class 10 Maths Tutorials

## 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 Read more…