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Physics

A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has a speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is

(a)

(b)

(c)

(d)

Chemistry

The critical temperature of water is higher than that of O₂ because the H₂O molecule has

(a)	fewer electrons than O₂	(b)	two covalent bonds
(c)	V-shape	(d)	dipole moment

Mathematics

Fill in the blanks :
The area of the triangle whose vertices are A (1, -1, 2), B (2, 1, -1), C (3, -1, 2) is...................

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