# Mathematics Delhi Set 1 2015-2016 English Medium Class 10 Question Paper Solution

Mathematics [Delhi Set 1]
Date & Time: 19th March 2016, 10:30 am
Duration: 3h

[1] 1

From an external point P, tangents PA and PB are drawn to a circle with centre O. If ∠PAB = 50°, then find ∠AOB.

Concept: Number of Tangents from a Point on a Circle
Chapter: [3.01] Circles
[1] 2

In Fig. 1, AB is a 6 m high pole and CD is a ladder inclined at an angle of 60° to the horizontal and reaches up to a point D of pole. If AD = 2.54 m, find the length of the ladder. (use3=1.73)

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[1] 3

Find the 9th term from the end (towards the first term) of the A.P. 5, 9, 13, ...., 185

Concept: Sum of First n Terms of an A.P.
Chapter: [2.02] Arithmetic Progressions
[1] 4

Cards marked with number 3, 4, 5, ...., 50 are placed in a box and mixed thoroughly. A card is drawn at random form the box. Find the probability that the selected card bears a perfect square number.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[2] 5

If x=2/3 and x =3 are roots of the quadratic equation ax2 + 7x + b = 0, find the values of a and b.

Concept: Nature of Roots of a Quadratic Equation
[2] 6

Find the ratio in which y-axis divides the line segment joining the points A(5, –6) and B(–1, –4). Also find the coordinates of the point of division.

Concept: Section Formula
Chapter: [6.01] Lines (In Two-dimensions)
[2] 7

In Fig. 2, a circle is inscribed in a ΔABC, such that it touches the sides AB, BC and CA at points D, E and F respectively. If the lengths of sides AB, BC and CA and 12 cm, 8 cm and 10 cm respectively, find the lengths of AD, BE and CF.

Concept: Circumference of a Circle
Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles
[2] 8

The x-coordinate of a point P is twice its y-coordinate. If P is equidistant from Q(2, –5) and R(–3, 6), find the coordinates of P.

Concept: Distance Formula
Chapter: [6.01] Lines (In Two-dimensions)
[2] 9

How many terms of the A.P. 18, 16, 14, .... be taken so that their sum is zero?

Concept: Sum of First n Terms of an A.P.
Chapter: [2.02] Arithmetic Progressions
[2] 10

In Fig. 3, AP and BP are tangents to a circle with centre O, such that AP = 5 cm and ∠APB = 60°. Find the length of chord AB.

Concept: Areas of Sector and Segment of a Circle
Chapter: [7.01] Areas Related to Circles
[3] 11

In Fig. 4, ABCD is a square of side 14 cm. Semi-circles are drawn with each side of square as diameter. Find the area of the shaded region.

(use pi=22/7)

Concept: Circumference of a Circle
Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles
[3] 12

In Fig. 5, is a decorative block, made up two solids – a cube and a hemisphere. The base of the block is a cube of side 6 cm and the hemisphere fixed on the top has diameter of 3.5 cm. Find the total surface area of the bock (Use pi=22/7)

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

In Fig. 6, ABC is a triangle coordinates of whose vertex A are (0, −1). D and E respectively are the mid-points of the sides AB and AC and their coordinates are (1, 0) and (0, 1) respectively. If F is the mid-point of BC, find the areas of ∆ABC and ∆DEF.

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

In Fig. 7, are shown two arcs PAQ and PBQ. Arc PAQ is a part of circle with centre O and radius OP while arc PBQ is a semi-circle drawn on PQ ad diameter with centre M. If OP = PQ = 10 cm show that area of shaded region is 25(sqrt3-pi/6)cm^2.

Concept: Circumference of a Circle
Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles
[3] 15

If the sum of first 7 terms of an A.P. is 49 and that of its first 17 terms is 289, find the sum of first n terms of the A.P.

Concept: Sum of First n Terms of an A.P.
Chapter: [2.02] Arithmetic Progressions
[3] 16

Solve for x

(2x)/(x-3)+1/(2x+3)+(3x+9)/((x-3)(2x+3)) = 0, x!=3,

Concept: Solutions of Quadratic Equations by Factorization
[3] 17

A well of diameter 4 m is dug 21 m deep. The earth taken out of it has been spread evenly all around it in the shape of a circular ring of width 3 m to form an embankment. Find the height of the embankment.

Concept: Concept of Surface Area, Volume, and Capacity
Chapter: [7.02] Surface Areas and Volumes [7.02] Surface Areas and Volumes
[3] 18

The sum of the radius of base and height of a solid right circular cylinder is 37 cm. If the total surface area of the solid cylinder is 1628 sq. cm, find the volume of the cylinder. ("use " pi=22/7)

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3] 19

The angles of depression of the top and bottom of a 50 m high building from the top of a tower are 45° and 60° respectively. Find the height of the tower and the horizontal distance between the tower and the building (use sqrt3=1.73)

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[3] 20

In a single throw of a pair of different dice, what is the probability of getting (i) a prime number on each dice?

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability

In a single throw of a pair of different dice, what is the probability of getting a total of 9 or 11?

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[4] 21

A passenger, while boarding the plane, slipped form the stairs and got hurt. The pilot took the passenger in the emergency clinic at the airport for treatment. Due to this, the plane got delayed by half an hour. To reach the destination 1500 km away in time, so that the passengers could catch the connecting flight, the speed of the plane was increased by 250 km/hour than the usual speed. Find the usual speed of the plane

What value is depicted in this question?

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[4] 22

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] 23

Draw two concentric circles of radii 3 cm and 5 cm. Construct a tangent to smaller circle from a point on the larger circle. Also measure its length.

Concept: Construction of Tangents to a Circle
Chapter: [3.03] Constructions
[4] 24

In Fig. 8, O is the centre of a circle of radius 5 cm. T is a point such that OT = 13 cm and OT intersects circle at E. If AB is a tangent to the circle at E, find the length of AB, where TP and TQ are two tangents to the circle.

Concept: Concept of Circle - Centre, Radius, Diameter, Arc, Sector, Chord, Segment, Semicircle, Circumference, Interior and Exterior, Concentric Circles
Chapter: [3.01] Circles [3.01] Circles
[4] 25

Find x in terms of a, b and c: a/(x-a)+b/(x-b)=(2c)/(x-c)

Concept: Solutions of Quadratic Equations by Factorization
[4] 26

A bird is sitting on the top of a 80 m high tree. From a point on the ground, the angle of elevation of the bird is 45°. The bird flies away horizontally in such a way that it remained at a constant height from the ground. After 2 seconds, the angle of elevation of the bird from the same point is 30°. Find the speed of flying of the bird.

("Take"sqrt3=1.732)

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[4] 27

A thief runs with a uniform speed of 100 m/minute. After one minute, a policeman runs after the thief to catch him. He goes with a speed of 100 m/minute in the first minute and increases his speed by 10 m/minute every succeeding minute. After how many minutes the policeman will catch the thief.

Concept: Algebraic Methods of Solving a Pair of Linear Equations - Cross - Multiplication Method
Chapter: [2.01] Pair of Linear Equations in Two Variables
[4] 28

Prove that the area of a triangle with vertices (t, t −2), (t + 2, t + 2) and (t + 3, t) is independent of t.

Concept: Area of a Triangle
Chapter: [6.01] Lines (In Two-dimensions)
[4] 29

A game of chance consists of spinning an arrow on a circular board, divided into 8 equal parts, which comes to rest pointing at one of the numbers 1, 2, 3, ..., 8 (Fig. 9), which are equally likely outcomes. What is the probability that the arrow will point at (i) an odd number (ii) a number greater than 3 (iii) a number less than 9.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[4] 30

An elastic belt is placed around the rim of a pulley of radius 5 cm. (Fig. 10) From one point C on the belt, the elastic belt is pulled directly away from the centre O of the pulley until it is at P, 10 cm from the point O. Find the length of the belt that is still in contact with the pulley. Also find the shaded area (use π = 3.14 and sqrt3=1.73)

Concept: Circumference of a Circle
Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles
[4] 31

A bucket open at the top is in the form of a frustum of a cone with a capacity of 12308.8 cm3. The radii of the top and bottom circular ends are 20 cm and 12 cm, respectively. Find the height of the bucket and the area of metal sheet used in making the bucket. (use π = 3.14)

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

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