What is "Punch Of The Week"?
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"Punch Of The Week" Team Members |
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| This Week's Punches |
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Arrange the sentences A, B, C and D to form a
logicalsequence between sentences 1 and 6. 1.The modern era may be said to have begun about the year 1895. A.So great a revolution in scientific thought has not occurred since Copernicus showed that the earth went round the sun. B.The first step was the experimental demonstration that there exist little electrified bodies very much smaller than a hydrogen atom. C.Between that year and the year 1900, those researches were begun which have changed our whole conception of matter. D. Further, these studies have changed our whole idea of the meaning and purpose of physical science. 6.These little bodies were produced by passing an electric current through a glass tube almost entirely exhausted of air. [1] CABD [2] BDCA [3] ACDB [4] CDAB [5] CBAD |
Quantitative Ability
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Consider a circle of radius 10 cm. and center O. Let
AOB and COD be two perpendicular diameters of this
circle. Consider the two tangent circles of diameters AO and
OB respectively. We have now three circles. Construct now 2
circles whose centers are on the segment CD and are tangent
to the other three circles.Find the radius(in cm) of the
smallest circle? |
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shaunakc said – Wed, 04 Nov 2009 17:14:12 -0000 ( Flag Edit Link )
answer is 10/3 ie option no.1 when u completely draw the figure….consider the triangle formed by taking the centres of circles formed by diameter AO, BO & tangent to the 3 circles…...apply apollonious theorem …..we get (5+r)2+(5+r)2=2(10-r)2+2×52 where r is the radius of smaller circle…....solving we get ans as 10/3