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CBSE->Std 10 Questions

Total Questions 2595
why unsaturated carbon compounds have double and triple bond instead of single bond ?
Explain each step of tropic level with example
Which are the biotic components of an ecosystem?
How food chain and food web interconnected with each other?
WRITE THE NAME AND STRUCTURAL FORMULA OF THE SECOND MEMBER OF THE HOMOLOGOUS SERIES WITH THE GENERAL FORMULA C2H2n+1OH?
WHICH IS STRONGER OUT OF SINGLE,DOUBLE AND TRIPLE BOND.WHY?
THE RADII OF TWO CONCENTRIC CIRCLES ARE 13CM AND 8CM.AB IS A DIAMETER OF THE BIGGER CIRCLE.BD IS A TANGENT TO THE SMALLER CIRCLE TOUCHING IT AT D.FIND THE LENGTH AD.
TWO TANGENT SEGMENTS BC,BD ARE DRAWN TO A CIRCLE WITH A CENTRE O SUCH THAT <DBC=120.PROVE THAT BO = 2BC.
FROM A POINT P,TWO TANGENTS PA AND PB ARE DRAWN TO A CIRCLE O.IF THE DISTANCE BETWEEN P AND O IS EQUAL TO THE DIAMETER OF THE CIRCLE,SHOW THAT TRIANGLE APB IS EQUILATERAL.
IF P AND Q ARE THE ROOTS OF THE QUADRATIC EQUATION X2-PX+Q=0 THEN P=? Q=?
IF 'a' AND 'b' ARE THE ROOTS OF THE EQUATION X2+KX+12=0 SUCH THAT a-b=1 THEN THE VALUE OF K IS?
what is principal focus?
The points A(2,9),B(a,5)and c(5,5)are the vertices of a triangle ABC,right angled at B.Find the value of a and hence the area of triangle ABC.
The angle of elevation of a cloud from a point 200m above the lake is 30 degree and the angle of deppression of its reflection in the lake is 60 degree find the height of the cloud above the lake.
In what ratio does the point (1/2,6) divide the line segment joining the points (3,5)and (-7,9)?
What point on x axis is equidistant from the pointsA(7,6)and B(-3,4)?
The area of a triangle whose vertices are(-2,-2),(-1,-3)and (x,0) is 3 square units .Find the value of x.
Determine the ratio in which the line 3x+y-9=0 divides the line segment joining the points (1,3)and (2,7)
If the points A(4,3)and B(x,5)are on the circle with centre O(2,3);find the value of x
A point Pis at a distance of root 10 from the point (2,3).Find the coordinates of the point P if its y coordinate is twice its x coordinate.