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Multiple Choice Question with Only One Choice Correct
Transformers are used in
(a) dc circuits alone
(b) ac circuits alone
(c) both ac and dc circuits
(d) integrated circuits

Chemistry

Multiple Choice Question
An acidic buffer solution can be prepared by mixing the solutions of

(a)	ammonium acetate and acetic acid	(b)	ammonium chloride and ammonium hydroxide
(c)	sulphuric acid and sodium hydroxide	(d)	sodium chloride and sodium hydroxide

Mathematics

The chords of contact of the pair of tangents drawn from each point on the line 2x + y = 4 to the circle x² + y² = 1 pass through te point ........... .

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