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# Mathematics Delhi Set 1 2012-2013 CBSE (Science) Class 12 Question Paper Solution

SubjectMathematics
Year2012 - 2013 (March)
Mathematics [Delhi Set 1]
Marks: 100Date: 2012-2013 March

1

Write the principal value of tan^(-1)+cos^(-1)(-1/2)

Concept: Inverse Trigonometric Functions - Inverse Trigonometric Functions - Principal Value Branch
Chapter: [1.01] Inverse Trigonometric Functions
2

Write the value of tan(2tan^(-1)(1/5))

Concept: Inverse Trigonometric Functions (Simplification and Examples)
Chapter: [1.01] Inverse Trigonometric Functions
3

Find the value of a if [[a-b,2a+c],[2a-b,3c+d]]=[[-1,5],[0,13]]

Concept: Applications of Determinants and Matrices
Chapter: [2.01] Determinants
4

If |[x+1,x-1],[x-3,x+2]|=|[4,-1],[1,3]|, then write the value of x.

Concept: Applications of Determinants and Matrices
Chapter: [2.01] Determinants
5

if [[9,-1,4],[-2,1,3]]=A+[[1,2,-1],[0,4,9]], then find the matrix A.

Concept: Subtraction of Matrices
Chapter: [2.02] Matrices
6

Write the degree of the differential equation x^3((d^2y)/(dx^2))^2+x(dy/dx)^4=0

Concept: Order and Degree of a Differential Equation
Chapter: [3.04] Differential Equations
7

If veca=xhati+2hatj-zhatk and vecb=3hati-yhatj+hatk are two equal vectors ,then write the value of x+y+z

Concept: Types of Vectors
Chapter: [4.02] Vectors
8

If a unit vector veca makes angles pi/3 with hati,pi/4 with hatj and acute angles θ with  hatk, then find the value of θ.

Concept: Vectors Examples and Solutions
Chapter: [4.02] Vectors
9

Find the Cartesian equation of the line which passes through the point (−2, 4, −5) and is parallel to the line (x+3)/3=(4-y)/5=(z+8)/6

Concept: Equation of a Line in Space
Chapter: [4.01] Three - Dimensional Geometry
10

The amount of pollution content added in air in a city due to x-diesel vehicles is given by P(x) = 0.005x3 + 0.02x2 + 30x. Find the marginal increase in pollution content when 3 diesel vehicles are added and write which value is indicated in the above question.

Concept: Increasing and Decreasing Functions
Chapter: [3.02] Applications of Derivatives
11

Show that the function f in A=R-{2/3}  defined as f(x)=(4x+3)/(6x-4) is one-one and onto hence find f-1

Concept: Types of Functions
Chapter: [1.02] Relations and Functions
12 | Attempt any one of the following
12.1

Find the value of the following: tan(1/2)[sin^(-1)((2x)/(1+x^2))+cos^(-1)((1-y^2)/(1+y^2))],|x| <1,y>0 and xy <1

Concept: Inverse Trigonometric Functions (Simplification and Examples)
Chapter: [1.01] Inverse Trigonometric Functions
12.2

Prove that: tan^(-1)(1/2)+tan^(-1)(1/5)+tan^(-1)(1/8)=pi/4

Concept: Properties of Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
13

Using properties of determinants prove the following: |[1,x,x^2],[x^2,1,x],[x,x^2,1]|=(1-x^3)^2

Concept: Properties of Determinants
Chapter: [2.01] Determinants
14

Differentiate the following function with respect to x: (log x)^x+x^(logx)

Concept: Logarithmic Differentiation
Chapter: [3.01] Continuity and Differentiability
15

If y=log[x+sqrt(x^2+a^2)]  show that (x^2+a^2)(d^2y)/(dx^2)+xdy/dx=0

Concept: Logarithmic Differentiation
Chapter: [3.01] Continuity and Differentiability
16 | Attempt any one of the following
16.1

Show that the function f(x)=|x-3|,x in R is continuous but not differentiable at x = 3.

Concept: Concept of Continuity
Chapter: [3.01] Continuity and Differentiability
16.2

If x = a sin t and y = a (cost+logtan(t/2)) ,find ((d^2y)/(dx^2))

Concept: Second Order Derivative
Chapter: [3.01] Continuity and Differentiability
17 | Attempt any one of the following
17.1

Evaluate : intsin(x-a)/sin(x+a)dx

Concept: Integration Using Trigonometric Identities
Chapter: [3.05] Integrals
17.2

Evaluate: int(5x-2)/(1+2x+3x^2)dx

Concept: Integrals of Some Particular Functions
Chapter: [3.05] Integrals
18

Evaluate :  int x^2/((x^2+4)(x^2+9))dx

Concept: Integrals of Some Particular Functions
Chapter: [3.05] Integrals
19

Evaluate : int_0^4(|x|+|x-2|+|x-4|)dx

Concept: Evaluation of Definite Integrals by Substitution
Chapter: [3.05] Integrals
20

If veca and vecb are two vectors such that |veca+vecb|=|veca|, then prove that vector 2veca+vecb is perpendicular to vector vecb

Concept: Product of Two Vectors - Scalar (Or Dot) Product of Two Vectors
Chapter: [4.02] Vectors
21 | Attempt any one of the following
21.1

Find the coordinates of the point, where the line (x-2)/3=(y+1)/4=(z-2)/2 intersects the plane x − y + z − 5 = 0. Also find the angle between the line and the plane.

Concept: Angle Between Line and a Plane
Chapter: [4.01] Three - Dimensional Geometry
21.2

Find the vector equation of the plane which contains the line of intersection of the planes vecr (hati+2hatj+3hatk)-4=0 and vec r (2hati+hatj-hatk)+5=0 which is perpendicular to the plane.vecr(5hati+3hatj-6hatk)+8=0

Concept: Vector and Cartesian Equation of a Plane
Chapter: [4.01] Three - Dimensional Geometry
22

A speaks truth in 60% of the cases, while B in 90% of the cases. In what percent of cases are they likely to contradict each other in stating the same fact? In the cases of contradiction do you think, the statement of B will carry more weight as he speaks truth in more number of cases than A?

Concept: Independent Events
Chapter: [6.01] Probability
23

A school wants to award its students for the values of Honesty, Regularity and Hard work with a total cash award of Rs 6,000. Three times the award money for Hard work added to that given for honesty amounts to Rs 11,000. The award money given for Honesty and Hard work together is double the one given for Regularity. Represent the above situation algebraically and find the award money for each value, using matrix method. Apart from these values, namely, Honesty, Regularity and Hard work, suggest one more value which the school must include for awards.

Concept: Invertible Matrices
Chapter: [2.02] Matrices
24 | Attempt any one of the following
24.1

Show that the height of the cylinder of maximum volume, which can be inscribed in a sphere of radius R is (2R)/sqrt3.  Also find the maximum volume.

Concept: Maxima and Minima
Chapter: [3.02] Applications of Derivatives
24.2

Find the equation of the normal at a point on the curve x2 = 4y which passes through the point (1, 2). Also find the equation of the corresponding tangent.

Concept: Tangents and Normals
Chapter: [3.02] Applications of Derivatives
25 | Attempt any one of the following
25.1

Using integration, find the area bounded by the curve x2 = 4y and the line x = 4y − 2.

Concept: Area of the Region Bounded by a Curve and a Line
Chapter: [3.03] Applications of the Integrals
25.2

Find the equation of the normal at a point on the curve x2 = 4y which passes through the point (1, 2). Also find the equation of the corresponding tangent.

Concept: Tangents and Normals
Chapter: [3.02] Applications of Derivatives
26

Show that the differential equation 2yx/y dx + (y − 2x ex/y) dy = 0 is homogeneous. Find the particular solution of this differential equation, given that x = 0 when y = 1.

Concept: Methods of Solving First Order, First Degree Differential Equations - Homogeneous Differential Equations
Chapter: [3.04] Differential Equations
27

Find the vector equation of the plane passing through three points with position vectors  hati+hatj-2hatk , 2hati-hatj+hatk and hati+2hatj+hatk . Also find the coordinates of the point of intersection of this plane and the line vecr=3hati-hatj-hatk lambda +(2hati-2hatj+hatk)

Concept: Vector and Cartesian Equation of a Plane
Chapter: [4.01] Three - Dimensional Geometry
28

A cooperative society of farmers has 50 hectares of land to grow two crops A and B. The profits from crops A and B per hectare are estimated as Rs 10,500 and Rs 9,000 respectively. To control weeds, a liquid herbicide has to be used for crops A and B at the rate of 20 litres and 10 litres per hectare, respectively. Further not more than 800 litres of herbicide should be used in order to protect fish and wildlife using a pond which collects drainage from this land. Keeping in mind that the protection of fish and other wildlife is more important than earning profit, how much land should be allocated to each crop so as to maximize the total profit? Form an LPP from the above and solve it graphically. Do you agree with the message that the protection of wildlife is utmost necessary to preserve the balance in environment?

Concept: Graphical Method of Solving Linear Programming Problems
Chapter: [5.01] Linear Programming
29

Assume that the chances of a patient having a heart attack is 40%. Assuming that a meditation and yoga course reduces the risk of heart attack by 30% and prescription of certain drug reduces its chance by 25%. At a time a patient can choose any one of the two options with equal probabilities. It is given that after going through one of the two options, the patient selected at random suffers a heart attack. Find the probability that the patient followed a course of meditation and yoga. Interpret the result and state which of the above stated methods is more beneficial for the patient.

Concept: Conditional Probability
Chapter: [6.01] Probability

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