Board Paper of Class 10 2016 Maths Delhi(SET 2)  Solutions
General Instructions :
(i) All questions are compulsory.
(ii) The question paper consists of 31 questions divided into four sections – A, B, C and D.
(iii) Section A contains 4 questions of 1 mark each, Section B contains 6 questions of 2 marks each, Section C contains 10 questions of 3 marks each and Section D contains 11 questions of 4 marks each.
(iv) Use of calculated is not permitted.
(i) All questions are compulsory.
(ii) The question paper consists of 31 questions divided into four sections – A, B, C and D.
(iii) Section A contains 4 questions of 1 mark each, Section B contains 6 questions of 2 marks each, Section C contains 10 questions of 3 marks each and Section D contains 11 questions of 4 marks each.
(iv) Use of calculated is not permitted.
 Question 1
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. VIEW SOLUTION
 Question 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. $\left(\mathrm{use}\sqrt{3}=1.73\right)$
VIEW SOLUTION
 Question 3
Find the 9^{th} term from the end (towards the first term) of the A.P. 5, 9, 13, ...., 185. VIEW SOLUTION
 Question 4
From an external point P, tangents PA and PB are drawn to a circle with centre O. If ∠PAB = 50°, then find ∠AOB. VIEW SOLUTION
 Question 5
The xcoordinate of a point P is twice its ycoordinate. If P is equidistant from Q(2, –5) and R(–3, 6), find the coordinates of P. VIEW SOLUTION
 Question 6
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.
VIEW SOLUTION
 Question 7
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.
VIEW SOLUTION
 Question 8
If $x=\frac{2}{3}\mathrm{and}x=3$ are roots of the quadratic equation ax^{2} + 7x + b = 0, find the values of a and b. VIEW SOLUTION
 Question 9
Find the ratio in which yaxis divides the line segment joining the points A(5, –6) and B(–1, –4). Also find the coordinates of the point of division. VIEW SOLUTION
 Question 10
How many terms of the A.P. 27, 24, 21, .... should be taken so that their sum is zero? VIEW SOLUTION
 Question 11
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. VIEW SOLUTION
 Question 12
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. VIEW SOLUTION
 Question 13
In Fig. 4, ABCD is a square of side 14 cm. Semicircles are drawn with each side of square as diameter. Find the area of the shaded region. $\left(\mathrm{use}\mathrm{\pi}=\frac{22}{7}\right)$
VIEW SOLUTION
 Question 14
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. $\left(\mathrm{use\pi}=\frac{22}{7}\right)$
VIEW SOLUTION
 Question 15
In Fig. 6, ABC is a triangle coordinates of whose vertex A are (0, −1). D and E respectively are the midpoints of the sides AB and AC and their coordinates are (1, 0) and (0, 1) respectively. If F is the midpoint of BC, find the areas of ∆ABC and ∆DEF.
VIEW SOLUTION
 Question 16
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 semicircle drawn on PQ ad diameter with centre M. If OP = PQ = 10 cm show that area of shaded region is $25\left(\sqrt{3}\frac{\mathrm{\pi}}{6}\right){\mathrm{cm}}^{2}.$
VIEW SOLUTION
 Question 17
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 $\sqrt{3}=1.73$) VIEW SOLUTION
 Question 18
Solve for x :
$\frac{x+1}{x1}+\frac{x2}{x+2}=4\frac{2x+3}{x2};x\ne 1,2,2\phantom{\rule{0ex}{0ex}}$ VIEW SOLUTION
 Question 19
Two different dice are thrown together. Find the probability of:
(i) getting a number greater than 3 on each die
(ii) getting a total of 6 or 7 of the numbers on two dice VIEW SOLUTION
 Question 20
A right circular cone of radius 3 cm, has a curved surface area of 47.1 cm^{2}. Find the volume of the cone. (use π 3.14). VIEW SOLUTION
 Question 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? VIEW SOLUTION
 Question 22
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.
VIEW SOLUTION
 Question 23
Prove that the lengths of tangents drawn from an external point to a circle are equal. VIEW SOLUTION
 Question 24
Prove that the area of a triangle with vertices (t, t −2), (t + 2, t + 2) and (t + 3, t) is independent of t. VIEW SOLUTION
 Question 25
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.
VIEW SOLUTION
 Question 26
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 $\sqrt{3}$= 1.73)
VIEW SOLUTION
 Question 27
A bucket open at the top is in the form of a frustum of a cone with a capacity of 12308.8 cm^{3}. 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) VIEW SOLUTION
 Question 28
The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are 60° and 30° respectively. Find the height of the tower. VIEW SOLUTION
 Question 29
Construct a triangle ABC in which BC = 6 cm, AB = 5 cm and ∠ABC = 60°. Then construct another triangle whose sides are $\frac{3}{4}$ times the corresponding sides of ΔABC. VIEW SOLUTION
 Question 30
The perimeter of a right triangle is 60 cm. Its hypotenuse is 25 cm. Find the area of the triangle. VIEW SOLUTION
 Question 31
A thief, after committing a theft, runs at a uniform speed of 50 m/minute. After 2 minutes, a policeman runs to catch him. He goes 60 m in first minute and increases his speed by 5 m/minute every succeeding minute. After how many minutes, the policeman will catch the thief? VIEW SOLUTION
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