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Physics
Multiple Choice Question with Only One Choice Correct The melting point of substances that contract on melting (a) decreases with increase in pressure (b) increases with increase in pressure (c) decreases at first and then increases with increase in pressure (d) is independent of pressure
Chemistry
Fill in the Blank : The unit cell of diamond is ......... .
Mathematics
For the circle x² + y² = r², find the value of r for which the area enclosed by the tangents drawn from the point P(6, 8) to the circle and the chord of contact is maximum.