Secondary School (English Medium) (5 to 8) कक्षा ८ - CBSE Question Bank Solutions

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Look at the shapes given below and state which of these are polyhedra using Euler’s formula.

Using Euler’s formula, find the value of unknown x in the following table.

Using Euler’s formula, find the value of unknown y in the following table.

Using Euler’s formula, find the value of unknown z in the following table.

Using Euler’s formula, find the value of unknown p in the following table.

Using Euler’s formula, find the value of unknown q in the following table.

Using Euler’s formula, find the value of unknown r in the following table.

Can a polyhedron have V = F = 9 and E = 16? If yes, draw its figure.

Check whether a polyhedron can have V = 12, E = 6 and F = 8.

A polyhedron has 60 edges and 40 vertices. Find the number of its faces.

A polyhedron has 20 faces and 12 vertices. Find the edges of the polyhedron.

A solid has forty faces and sixty edges. Find the number of vertices of the solid.

Suppose for the principal P, rate R% and time T, the simple interest is S and compound interest is C. Consider the possibilities.

1. C > S
2. C = S
3. C < S

Then

Suppose a certain sum doubles in 2 years at r % rate of simple interest per annum or at R% rate of interest per annum compounded annually. We have ______.

The compound interest on Rs 50,000 at 4% per annum for 2 years compounded annually is ______.