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Physics

Multiple Choice Question with Only One Choice Correct
Two charges are placed at certain distance apart in air. When a metallic sheet is placed between them, the electrostatic force between them will
(a) decrease (b) increase
(c) remain unchanged (d) become zero

Chemistry

Multiple Choice Question
Chlorine acts as a bleaching agent only in presence of
(a) dry air (b) moisture (c) sunlight (d) pure oxygen

Mathematics

Let x and y be two real variables such that x > 0 and xy = 1. Find the minimum value of x + y.
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