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1. A cyclist takes 2 hrs less to cover a distance of 200km if he increases his speed by 5km/h. Find his original speed. 2. A year ago, a man's age was 8 times his son's age. Now his age is equal to the square of his son's age. Find their present ages. 3. A motorboat whose speed in still water is 15km/hr goes 30km downstream and returns to the starting point in a total time of 4 hrs and 30 minutes. Find the speed of the stream.
what is photosynthesis?
why smoke rises up?
why sky is blue in colour?
Which gases are involved in global warming? what is the gases in our environment?
what is global warming?
what is green house effect?
why AgBr shows both frenkel & schotkky defects?
HOW ARE POLYSACCHARIDES AND DISACCHARIDES DIGESTED
what are the features of Kerala rivers
Explain the terms - flame,fuel,ideal fuel,calorific value.
What are the differences between intra-cloud lightning and inter-cloud lightning ?
Explain test-tube babies.
Explain embryo.
Find the volume of a cuboid of length 12cm breadth 7cm and height 9cm ?
The length and breadth of a rectangular piece of land are 500m and 300m respectively. (1) its area (2)the cost of the land,if 1m square of land costs Rs 10,000
In a figure,circles centered at A and B touch at C with AC=9cm and BC=4cm. The line PQ touches these circles ay P and Q. a)How much are angle APQ and angle BQP? b)Calculate the length of PQ.
briefly explain solar power through photovoltaic cells as an strategies for sustainable development?
briefly eplain wind power as an strategies for sustainable development?
which are the tow types of skelitiel system?