Board Paper of Class 12Science 2013 Maths All India(SET 2)  Solutions
i. All questions are compulsory.
ii. The question paper consists of 29 questions divided into three sections A, B and C. Section A comprises of 10 questions of one mark each, Section B comprises of 12 questions of four marks each, and Section C comprises of 7 questions of six marks each.
iii. All questions in section A are to be answered in one word, one sentence or as per the exact requirements of the question.
iv. There is no overall choice. However, internal choice has been provided in 4 questions of four marks each and 2 questions of six marks each. You have to attempt only one of the alternatives in all such questions.
v. Use of calculators is not permitted.
 Question 1
Write the differential equation representing the family of curves y = mx, where m is an arbitrary constant.
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 Question 2
If A_{ij} is the cofactor of the element a_{ij} of the determinant, then write the value of a_{32} · A_{32}.
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 Question 3
Write the value of.
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 Question 4
For what value of x, is the matrix a skewsymmetric matrix?
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 Question 5
Write the principal value of.
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 Question 6
The money to be spent for the welfare of the employees of a firm is proportional to the rate of change of its total revenue (marginal revenue). If the total revenue (in rupees) received from the sale of x units of a product is given by R(x) = 3x^{2} + 36x + 5, find the marginal revenue, when x = 5, and write which value does the question indicate.
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 Question 7
Find the length of the perpendicular drawn from the origin to the plane 2x − 3y + 6z + 21 = 0.
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 Question 8
Find, if for a unit vector .
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 Question 9
If matrix and A^{2} = pA, then write the value of p.
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 Question 10
A and B are two points with position vectors respectively. Write the position vector of a point P which divides the line segment AB internally in the ratio 1 : 2.
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