Q. 1) Which are the national symbol of India ?

Ans.) National Flag, National Song, National Anthem & National Emblem.

Q. 2) Who is the president of India ?

Ans.)

Q. 3) Who is the prime minister of India ?

Ans.)

Q. 4) Which are types of energy ?

Ans.) Solar energy, Bio-gas energy, Geothermal energy, Hydro energy & Tidal energy.

Q. 5) What is acid rain ?

Ans.) The acid rain  is caused by the smoke coming out of the vehicles they mostly leave sulphur, it goes up in the sky and form cloud, the water in the cloud react with the sulphur and form sulphuric acid and come down as acid rain.

Q. 6) Name the types of disaster ?

Ans.) Chemical disaster, Biological disaster & Nuclear disaster.

Q. 7) What is the speed of light ?

Ans.) The speed of light is

                                        300000 km/s in air

                                        225000 km/s in water

                                        180000 km/s in glass

Q. 8) Write some formulas ?

Ans.) Some formulas are as follows :-

1)        (x + a) (x + b) = x² + (a + b) x + ab

2)        (a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca

3)        (a + b)³ = a³ + 3ab (a + b) + b³

4)        (a - b)³ = a³ - 3ab (a - b) - b³

5)        a³ + b³ = (a + b)³ - 3ab (a + b)

6)        a³ - b³ = (a - b)³ + 3ab (a - b)

7)        a³ + b³ + c³ - 3abc = (a² + b² + c²) (a + b + c - ab - bc - ca)

Q. 9) Write some unit ?

Ans.) Some unit are as follows :-

                                                    100mm² = 1cm²

                                                    100cm² = 1dm²

                                                    100dm² = 1m²

                                                    10000cm² = 1m²

                                                    1are = 100m² = 1dam²

                                                    1hectare = 10000m² = 1hm² = 100ares

                                                    100hectares = 1km²