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Questions

Physics

Multiple Choice Question with Only One Choice Correct
Huygen' s principle states that every point on a wavefront in a homogeneous and isotropic medium is to be considered as a source of secondary
(a) plane wavelets
(b) cylindrical wavelets
(c) spherical wavelets
(d) wavelets of any complicated shape

Chemistry

What volume of 95 mass per cent of alcohol (density 0.809 g cm^-3) must be used to prepare 150 cm³ of 30 mass per cent alcohol (density 0.987 g cm^-3)?

Mathematics

Number of solutions of the equation tan x + sec x = 2 cos x lying in the interval [0, 2

] is

(a)	0	(b)	1
(c)	2	(d)	3

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