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CBSE Class 11 Science Free Doubts and Solutions

CBSE - XI Science - Mathematics

factorise x²-2√5x+3=0 by splitting method

Asked by Shivendra 22nd April 2018, 11:21 PM
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CBSE - XI Science - Physics

Show that A vector . B vector = 1/4 [(A vector + B vector)2 - ( A vector - B vector)2].

Asked by sudhirhanda144 22nd April 2018, 3:38 PM
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CBSE - XI Science - Physics

Find the resultant of the following forces acting at a point -  1) 100√2 dyne along north - east. 2) 980√2 dyne along north - west and 3) 2.0g wt along south.

Asked by sudhirhanda144 22nd April 2018, 3:17 PM
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CBSE - XI Science - Mathematics

sin(a+b)= sina.cosb +cosa.sinb how?prove  

Asked by Shivendra 22nd April 2018, 10:09 AM
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CBSE - XI Science - Mathematics

find the real numbers x and y if (x-iy)(3+5i) is the conjugate of -6-24i

Asked by balagayathrimukkamala 21st April 2018, 4:09 PM
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CBSE - XI Science - Chemistry

HC ≡ CH  above arrow mark is H2O-----------> below the arrow mark is Hg2^+/H^+   ©what effect does branching of alkane chain has on its boiling point

Asked by gganga 14th April 2018, 10:18 PM
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CBSE - XI Science - Mathematics

{x belongs to R : 0< x< 1} explain why it is infinite set

Asked by govtsecschoolnayaganv051 14th April 2018, 3:21 PM
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CBSE - XI Science - Chemistry

which is expected to more stable : O2NCH2 CH2O^- or CH3CH2O^- and why

Asked by gganga 13th April 2018, 4:48 PM
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CBSE - XI Science - Mathematics

Ques.1 (v) solution explain that why it is phi

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Asked by govtsecschoolnayaganv051 13th April 2018, 4:21 PM
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