The following table shows the total power shortage percentage in India from 1991-1997. Show the data in the form of a Bar graph taking shortage percentage for the years on the Y-axis and the years on the X-axis. If shortage percentage of power increases year by year, how will it affect on human life ? Explain.

The following table shows the total power shortage percentage in India from 1991-1997. Show the data in the form of a Bar graph taking shortage percentage for the years on the Y-axi and the years on X-axis.

In which of the following situations, does the list of numbers involved in the form a G.P.? (i) Salary of Sharmila, when her salary is Rs. 5,00,000 for the first year and expected to receive yearly increase of 10%.

A radio active isotope has a half-life of T years. How long will it take the activity to reduce to 1% of its original value ?

A radio active isotope has a half-life of T years. How long will it take the activity to reduce to 3.125%

Suppose India had a target of producing by 2020 AD, 200,000 MW of electric power, ten percent of which was to be obtained from nuclear power plants. Suppose we are given that, on an average, the efficiency of utilization (i.e. conversion to electric energy) of thermal energy produced in a reactor was 25%. How much amount of fissionable uranium would our country need per year by 2020? Take the heat energy per fission of 235U to be about 200MeV.

Half lives of two isotopes X and Y of a material are known to be 2xx10^(9) years and 4xx10^(9) years respectively. If a planet forms with equal number of these isotopes, estimate the current age of the planet, given that currently the material has 20% of X and 80% of Y by number