Board Paper of Class 10 2016 Maths (SET 1)  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
In fig. 1, PQ is a tangent at a point C to a circle with centre O. If AB is a diameter and ∠CAB = 30°, find ∠PCA.
VIEW SOLUTION
 Question 2
For what value of k will k + 9, 2k – 1 and 2k + 7 are the consecutive terms of an A.P.? VIEW SOLUTION
 Question 3
A ladder, leaning against a wall, makes an angle of 60° with the horitonzal. If the foot of the ladder is 2.5 m amay from the wall, find the length of the ladder. VIEW SOLUTION
 Question 4
A card is drawn at random from a well shuffled pack of 52 playing cards. Find the probability of getting neither a red card nor a queen. VIEW SOLUTION
 Question 5
If –5 is a root of the quadratic equation 2x^{2}^{ }+ px – 15 = 0 and the quadratic equation p(x^{2} + x) + k = 0 has equal roots, find the value of k. VIEW SOLUTION
 Question 6
Let P and Q be the points of trisection of the line segment joining the points A(2, –2) and B(–7, 4) such that P is nearer to A. Find the coordinates of P and Q. VIEW SOLUTION
 Question 7
In Fig. 2, a quadrilateral ABCD is drawn to circumscribe a circle with centre O in such a way that the sides AB, BC, CD and DA touch the circle at the points P, Q, R and S respectively. Prove that AB+ CD = BC + DA.
VIEW SOLUTION
 Question 8
Prove that the points (3, 0), (6, 4) and (−1, 3) are the vertices of a right angled isosceles triangle. VIEW SOLUTION
 Question 9
The 4^{th} term of an A.P. is zero. Prove that the 25^{th} term of the A.P. is three times its 11^{th} term. VIEW SOLUTION
 Question 10
In Fig. 3, from an external point P, two tangents PT and PS are drawn to a circle with centre O and radius r.
If OP = 2r, show that ∠OTS = ∠OST = 30°.
VIEW SOLUTION
 Question 11
In fig. 4, O is the centre of a circle such that diameter AB = 13 cm and AC = 12 cm. BC is joined. Find the area of the shaded region.
(Take π = 3.14)
VIEW SOLUTION
 Question 12
In the figure, a tent is in the shape of a cylinder surmounted by a conical top of same diameter. If the height and diameter of cylindrical part are 2.1 m and 3 m, respectively, and the slant height of conical part is 2.8 m, find the cost of canvas needed to make the tent if the canvas is available at the rate of Rs 500/sq. metre. $\left(\mathrm{Use}\mathrm{\pi}=\frac{22}{7}\right)$
VIEW SOLUTION
 Question 13
If the point P(x, y) is equidistant from the points A(a + b, b − a) and B(a − b, a + b). Prove that bx = ay. VIEW SOLUTION
 Question 14
In fig. 6, find the area of the shaded region, enclosed between two concentric circles of radii 7 cm and 14 cm, where $\angle \mathrm{AOC}=40\xb0.\left(\mathrm{Use}\mathrm{\pi}=\frac{22}{7}\right)$
VIEW SOLUTION
 Question 15
If the ratio of the sum of first n terms of two A.P's is (7n + 1) : (4n + 27), find the of their m^{th} terms. VIEW SOLUTION
 Question 16
Solve for x : $\frac{1}{\left(x1\right)\left(x2\right)}+\frac{1}{\left(x2\right)\left(x3\right)}=\frac{2}{3},x\ne 1,2,3$ VIEW SOLUTION
 Question 17
A conical vessel, with base radius 5 cm and height 24 cm, is full of water. This water is emptied into a cylindrical vessel of base radius 10 cm. Find the height to which the water will rise in the cylindrical vessel. $\left(\mathrm{Use}\mathrm{\pi}=\frac{22}{7}\right)$ VIEW SOLUTION
 Question 18
A sphere of diameter 12 cm, is dropped in a right circular cylindrical vessel, partly filled with water. If the sphere is completely submerged in water, the water level in the cylindrical vessel rises by $3\frac{5}{9}\mathrm{cm}$. Find the diameter of the cylindrical vessel. VIEW SOLUTION
 Question 19
A man standing on the deck of a ship, which is 10 m above water level, observes the angle of elevation of the top of a hill as 60° and the angle of depression of the base of hill as 30°. Find the distance of the hill from the ship and the height of the hill. VIEW SOLUTION
 Question 20
Three different coins are tossed together. Find the probability of getting
(i) exactly two heads (ii) at least two heads (iii) at least two tails. VIEW SOLUTION
 Question 21
Due to heavy floods in a state, thousands were rendered homeless. 50 schools collectively offered to the state government to provide place and the canvas for 1500 tents to be fixed by the government and decided to share the whole expenditure equally. The lower part of each tent is cylindrical of base radius 2.8 m and height 3.5 m, with conical upper part of same base radius but of height 2.1 m. If the canvas used to make the tents costs Rs 120 per sq.m, find the amount shared by each school to set up the tents. What value is generated by the above problem? $\left(\mathrm{Use}\mathrm{\pi}=\frac{22}{7}\right)$ VIEW SOLUTION
 Question 22
Prove that the lengths of the tangents drawn from an external point to a circle are equal. VIEW SOLUTION
 Question 23
Draw a circle of radius 4 cm. Draw two tangents to the circle inclined at an angle of 60° to each other. VIEW SOLUTION
 Question 24
In the figure, two equal circles, with centres O and O', touch each other at X.OO' produced meets the circle with centre O' at A. AC is tangent to the circle with centre O, at the point C. O'D is perpendicular to AC. Find the value of $\frac{\mathrm{DO}\text{'}}{\mathrm{CO}}$.
VIEW SOLUTION
 Question 25
Solve for $x:\frac{1}{x+1}+\frac{2}{x+2}=\frac{4}{x+4},x\ne 1,2,4$ VIEW SOLUTION
 Question 26
The angle of elevation of the top Q of a vertical tower PQ from a point X on the ground is 60°. From a point Y, 40 m vertically above X, the angle of elevation of the top Q of tower is 45°. Find the height of the tower PQ and the distance PX. $\left(\mathrm{Use}\sqrt{3}=1.73\right)$ VIEW SOLUTION
 Question 27
The houses in a row are numbered consecutively from 1 to 49. Show that there exists a value of X such that sum of numbers of houses proceeding the house numbered X is equal to sum of the numbers of houses following X. VIEW SOLUTION
 Question 28
In fig. 8, the vertices of ΔABC are A(4, 6), B(1, 5) and C(7, 2). A linesegment DE is drawn to intersect the sides AB and AC at D and E, respectively, such that $\frac{\mathrm{AD}}{\mathrm{AB}}=\frac{\mathrm{AE}}{\mathrm{AC}}=\frac{1}{3}$. Calculate the area of ΔADE and compare it with area of ΔABC.
VIEW SOLUTION
 Question 29
A number x is selected at random from the numbers 1, 2, 3 and 4. Another number y is selected at random from the numbers 1, 4, 9 and 16. Find the probability that product of x and y is less than 16. VIEW SOLUTION
 Question 30
In Fig. 9, is shown a sector OAP of a circle with centre O, containing ∠θ. AB is perpendicular the radius OA and meets OP produced at B. Prove that the perimeter of shaded region is $r\left[\mathrm{tan}\theta +\mathrm{sec}\theta +\frac{\mathrm{\pi}\theta}{180}1\right]$.
VIEW SOLUTION
 Question 31
A motor boat whose speed is 24 km/h in still water takes 1 hour more to go 32 km upstream than to return downstream to the same spot. Find the speed of the stream. VIEW SOLUTION
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