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Questions

Physics

Multiple Choice Question with Only One Choice Correct
X-rays are produced when an element of high atomic weight is bombarded by high energy

(a)	protons	(b)	electrons
(c)	neutrons	(d)	photons

Chemistry

Fill in the Blank :
Silicon exists in the ......... allotropic forms.

Mathematics

If x, y and z are real and different and u = x² + 4y² + 9z² - 6yz - 3zx - 2xy, then u is always

(a)	non-negative	(b)	zero
(c)	non-positive	(d)	none of these

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