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Physics
Multiple Choice Question with Two or More Choices Correct Choose the correct statements from the following : (a) If n identical cells, each of emf E and internal resistance r are connected in series, the emf of the combination is nE and the internal resistance of the combination is nr. (b) If n identical cells, each of emf E and internal resistance r are connected in parallel, the emf of the combination is E/n and the internal resistance of the combination is r/n. (c) Cells should be connected in series if the external resistance R is greater than internal resistance r. (d) Cells should be connected in parallel of R is smaller than r.
Chemistry
True or False : Aluminium is extracted from bauxite by the process of electrolytic reduction.
Mathematics
If (1 + ax)ⁿ = 1 + 8x + 24x² + ....., then a = ............ and n = .............. .

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