Which of the following causes damage to bridges, iron railings and all objects made of metals?
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A fungal cell wall is made of :
In which state is Koyna dam located?
Which of the following is added to iron to make iron hard and strong?
Ice floats on water because its density is
HDI is an aggregate measure of progress in which of the three dimensions?
What of the given below devices converts chemical energy to electrical energy?
The energy released at the end of digestion is in the form of