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Multiple Choice Question with Only One Choice Correct
A steel metre scale is to be ruled so that the millimetre intervals are accurate to about 5 x 10^-5 m at a certain temperature. The maximum temperature variation allowed during ruling is (the coefficient of linear expansion of steel = 10 x 10^-6 K^-1) .

(a)	2 ^oC	(b)	5 ^oC
(c)	7 ^oC	(d)	10 ^oC

Chemistry

The half-life of radium is 1620 years. How many radium atoms decay in 1 s in 1-g sample of radium? The molar mass of radium is 226 g mol^-1.

Mathematics

A rectangle PQRS has its sides PQ parallel to the line y = mx and vertices P, Q, and S on the lines y = a, x = b and x = -b, respectively. Find the locus of the vertex R.

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