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Questions

Physics

Multiple Choice Question with Two or More Choices Correct
In which of the following cases do we obtain a spherical wavefront?
(a) Sunlight focussed by a convex lens
(b) Light diverging from a straight slit
(c) Light emitted by a point source in an isotropic medium
(d) A parallel beam of light reflected from a plane mirror

Chemistry

Multiple Choice Question
The compound that is not a Lewis acid is

(a)

BF₃

(b)

AlCl₃

(c)

BeCl₂

(d)

SnCl₄

Mathematics

The lines 3x - 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to the same circle. The radius of this circle is ...............

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