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Multiple Choice Question with Only One Choice Correct
Two spherical balls A and B made of the same material, are heated to the same temperature. They are then placed in identical surroundings. If the diameter of A is twice that of B, the ratio of rates of cooling of A and B will be

(a)	1 : 1	(b)	2 : 1
(c)	4 : 1	(d)	1 : 4

Chemistry

Multiple Choice Question
Which of the following minerals does not contain iron?

(a)

Magnetite

(b)

Magnesite

(c)

Haematite

(d)

Limonite

Mathematics

The circles, each of radius 5 units, touch each other at (1, 2). If the equation of their common tangent is 4x + 3y = 10, find the equations of the circles.

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