Question
The price of kerosene increases by 20% and then by a
further (20/3) %Â . Find the percentage by which the consumption of kerosene must be reduced so that expenditure on kerosene remains the same.Solution
Let the original price of kerosene be Rs. '100x' Then, increased price of kerosene = 100x X (120/100) X (320/300) = Rs. '128x' So, percentage by which consumption must be reduced = 100 - (100x/128x) X 100 = 100 - 78.125 = 21.875%
Which of the following is the most reactive element in the Halogen series?Â
At what temperature a body will not radiate any heat energy?
Which of the following is a process in which water from any source change into vapour state ‘due to heat’?
If a metal can be drawn into wires relatively easily it is called:
An object of mass 2 kg is lifted vertically through a distance of 1.5 m. The work done in process is
Which of the following methods is suitable for preventing an iron frying pan from rusting?
The gap between two neurons is called as
The number of electrons present in Carbon is?
The Planck constant is used to:
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -