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# Mathematics Delhi Set 2 2014-2015 CBSE Class 10 Question Paper Solution

SubjectMathematics
Year2014 - 2015 (March)
Mathematics [Delhi Set 2]
Marks: 90Date: 2014-2015 March

[1]1

A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is consonant.

Concept: Probability Examples and Solutions
Chapter: [5.01] Probability
[1]2

In Fig. 1, PA and PB are tangents to the circle with centre O such that ∠APB = 50°. Write the measure of ∠OAB.

Concept: Circles Examples and Solutions
Chapter: [3.01] Circles
[1]3

The tops of two towers of height x and y, standing on level ground, subtend angles of 30° and 60° respectively at the centre of the line joining their feet, then find x, y.

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[1]4

If x=1/2, is a solution of the quadratic equation 3x2+2kx3=0, find the value of k

Concept: Nature of Roots
[1]5

If A(5, 2), B(2, −2) and C(−2, t) are the vertices of a right angled triangle with ∠B = 90°, then find the value of t.

Concept: Distance Formula
Chapter: [6.01] Lines (In Two-dimensions)
[2]6

From a point T outside a circle of centre O, tangents TP and TQ are drawn to the circle. Prove that OT is the right bisector of line segment PQ.

Concept: Circles Examples and Solutions
Chapter: [3.01] Circles
[2]7

In Fig. 2, AB is the diameter of a circle with centre O and AT is a tangent. If ∠AOQ = 58°, find ∠ATQ.

Concept: Circles Examples and Solutions
Chapter: [3.01] Circles
[2]8

Solve the following quadratic equation for x4x2  4a2x + (a4  b4) =0.

Concept: Solutions of Quadratic Equations by Factorization
[2]9

Find the ratio in which the point P(3/4,5/12) divides the line segment joining the points A(1/2,3/2) and B(2,-5)

Concept: Section Formula
Chapter: [6.01] Lines (In Two-dimensions)
[2]10

Find the middle term of the A.P. 213, 205, 197, ---, 37.

Concept: Arithmetic Progression
Chapter: [2.02] Arithmetic Progressions
[3]11

In Fig. 3, APB and AQO are semicircles, and AO = OB. If the perimeter of the figure is 40 cm, find the area of the shaded region [Use pi=22/7]

Concept: Problems Based on Areas and Perimeter Or Circumference of Circle, Sector and Segment of a Circle
Chapter: [7.01] Areas Related to Circles
[3]12

A solid wooden toy is in the form of a hemisphere surrounded by a cone of same radius. The radius of hemisphere is 3.5 cm and the total wood used in the making of toy is 166 5/6  cm3. Find the height of the toy. Also, find the cost of painting the hemispherical part of the toy at the rate of Rs 10 per cm2 .[Usepi=22/7]

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]13

Find the area of the triangle ABC with A(1, −4) and mid-points of sides through A being (2, −1) and (0, −1).

Concept: Area of a Triangle
Chapter: [6.01] Lines (In Two-dimensions)
[3]14

In Fig. 4, from the top of a solid cone of height 12 cm and base radius 6 cm, a cone of height 4 cm is removed by a plane parallel to the base. Find the total surface area of the remaining solid. (Use pi=22/7 and sqrt5=2.236)

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]15

In Fig. 5, from a cuboidal solid metallic block, of dimensions 15cm ✕ 10cm ✕ 5cm, a cylindrical hole of diameter 7 cm is drilled out. Find the surface area of the remaining block [Use

pi=22/7]

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]16

In Fig. 6, find the area of the shaded region [Use π = 3.14]

Concept: Problems Based on Areas and Perimeter Or Circumference of Circle, Sector and Segment of a Circle
Chapter: [7.01] Areas Related to Circles
[3]17

The angle of elevation of the top of a building from the foot of the tower is 30° and the angle of elevation of the top of the tower from the foot of the building is 45°. If the tower is 30 m high, find the height of the building.

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[3]18

If the sum of the first n terms of an A.P. is 1/2(3n2 +7n), then find its nth term. Hence write its 20th term.

Concept: Sum of First n Terms of an AP
Chapter: [2.02] Arithmetic Progressions
[3]19

Three distinct coins are tossed together. Find the probability of getting

Concept: Probability Examples and Solutions
Chapter: [5.01] Probability
[3]20

Find that value of p for which the quadratic equation (p + 1)x2 − 6(p + 1)x + 3(p + 9) = 0, p ≠ − 1 has equal roots. Hence find the roots of the equation.

Concept: Nature of Roots
[4]21

In Fig. 7, tangents PQ and PR are drawn from an external point P to a circle with centre O, such that ∠RPQ = 30°. A chord RS is drawn parallel to the tangent PQ. Find ∠RQS.

Concept: Circles Examples and Solutions
Chapter: [3.01] Circles
[4]22

From a point P on the ground the angle of elevation of the top of a tower is 30° and that of the top of a flag staff fixed on the top of the tower, is 60°. If the length of the flag staff is 5 m, find the height of the tower.

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[4]23

Ramkali required Rs 2,500 after 12 weeks to send her daughter to school. She saved Rs 100 in the first week and increased her weekly saving by Rs 20 every week. Find whether she will be able to send her daughter to school after 12 weeks.

What value is generated in the above situation?

Concept: Sum of First n Terms of an AP
Chapter: [2.02] Arithmetic Progressions
[4]24

A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is divisible by 2 or 3.

Concept: Probability Examples and Solutions
Chapter: [5.01] Probability

A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is a prime number.

Concept: Probability Examples and Solutions
Chapter: [5.01] Probability
[4]25

Water is flowing at the rate of 2.52 km/h through a cylindrical pipe into a cylindrical tank, the radius of whose base is 40 cm. If the increase in the level of water in the tank, in half an hour is 3.15 m, find the internal diameter of the pipe.

Concept: Surface Areas and Volumes Examples and Solutions
Chapter: [7.02] Surface Areas and Volumes
[4]26

A well of diameter 4 m is dug 14 m deep. The earth taken out is spread evenly all around the well to form a 40 cm high embankment. Find the width of the embankment.

Concept: Surface Areas and Volumes Examples and Solutions
Chapter: [7.02] Surface Areas and Volumes
[4]27

Solve for x :

2/(x+1)+3/(2(x-2))=23/(5x), x!=0,-1,2

Concept: Solutions of Quadratic Equations by Factorization
[4]28

To fill a swimming pool two pipes are to be used. If the pipe of larger diameter is used for 4 hours and the pipe of smaller diameter for 9 hours, only half the pool can be filled. Find, how long it would take for each pipe to fill the pool separately, if the pipe of smaller diameter takes 10 hours more than the pipe of larger diameter to fill the pool.

Concept: Surface Areas and Volumes Examples and Solutions
Chapter: [7.02] Surface Areas and Volumes
[4]29

Prove that the lengths of the tangents drawn from an external point to a circle are equal.

Concept: Number of Tangents from a Point on a Circle
Chapter: [3.01] Circles
[4]30

Construct an isosceles triangle whose base is 6 cm and altitude 4 cm. Then construct another triangle whose sides are 3/4times the corresponding sides of the isosceles triangle.

Concept: Constructions Examples and Solutions
Chapter: [3.03] Constructions
[4]31

If P(–5, –3), Q(–4, –6), R(2, –3) and S(1, 2) are the vertices of a quadrilateral PQRS, find its area.

Concept: Area of a Triangle
Chapter: [6.01] Lines (In Two-dimensions)

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