Board Paper of Class 10 2017 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
What is the common difference of an A.P. in which a_{21} – a_{7} = 84? VIEW SOLUTION
 Question 2
If the angle between two tangents drawn from an external point P to a circle of radius a and centre O, is 60°, then find the length of OP. VIEW SOLUTION
 Question 3
If a tower 30 m high, casts a shadow $10\sqrt{3}$ m long on the ground, then what is the angle of elevation of the sun? VIEW SOLUTION
 Question 4
The probability of selecting a rotten apple randomly from a heap of 900 apples is 0.18. What is the number of rotten apples in the heap? VIEW SOLUTION
 Question 5
Find the value of p, for which one root of the quadratic equation px^{2} – 14x + 8 = 0 is 6 times the other. VIEW SOLUTION
 Question 6
Which term of the progression $20,19\frac{1}{4},18\frac{1}{2},17\frac{3}{4},...$ is the first negative term? VIEW SOLUTION
 Question 7
Prove that the tangents drawn at the end points of a chord of a circle make equal angles with the chord. VIEW SOLUTION
 Question 8
A circle touches all the four sides of a quadrilateral ABCD. Prove that AB + CD = BC + DA. VIEW SOLUTION
 Question 9
A line intersects the yaxis and xaxis at the points P and Q respectively. If (2, –5) is the midpoint of PQ, then find the coordinates of P and Q. VIEW SOLUTION
 Question 10
If the distances of P(x, y) from A(5, 1) and B(–1, 5) are equal, then prove that 3x = 2y. VIEW SOLUTION
 Question 11
If ad ≠ bc, then prove that the equation (a^{2} + b^{2}) x^{2} + 2 (ac + bd) x + (c^{2} + d^{2}) = 0 has no real roots. VIEW SOLUTION
 Question 12
The first term of an A.P. is 5, the last term is 45 and the sum of all its terms is 400. Find the number of terms and the common difference of the A.P. VIEW SOLUTION
 Question 13
On a straight line passing through the foot of a tower, two points C and D are at distances of 4 m and 16 m from the foot respectively. If the angles of elevation from C and D of the top of the tower are complementary, then find the height of the tower. VIEW SOLUTION
 Question 14
A bag contains 15 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball, find the number of black balls in the bag. VIEW SOLUTION
 Question 15
In what ratio does the point $\left(\frac{24}{11},\mathrm{y}\right)$ divide the line segment joining the points P(2, –2) and Q(3, 7)? Also find the value of y. VIEW SOLUTION
 Question 16
Three semicircles each of diameter 3 cm, a circle of diameter 4.5 cm and a semicircle of radius 4.5 cm are drawn in the given figure. Find the area of the shaded region.
VIEW SOLUTION
 Question 17
In the given figure, two concentric circles with centre O have radii 21 cm and 42 cm. If ∠AOB = 60°, find the area of the shaded region. $\left[\mathrm{Use}\mathrm{\pi}=\frac{22}{7}\right]$
VIEW SOLUTION
 Question 18
Water in a canal, 5·4 m wide and 1·8 m deep, is flowing with a speed of 25 km/hour. How much area can it irrigate in 40 minutes, if 10 cm of standing water is required for irrigation? VIEW SOLUTION
 Question 19
The slant height of a frustum of a cone is 4 cm and the perimeters of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum. VIEW SOLUTION
 Question 20
The dimensions of a solid iron cuboid are 4·4 m × 2·6 m × 1·0 m. It is melted and recast into a hollow cylindrical pipe of 30 cm inner radius and thickness 5 cm. Find the length of the pipe. VIEW SOLUTION
 Question 21
 Question 22
Two taps running together can fill a tank in $3\frac{1}{13}$ hours. If one tap takes 3 hours more than the other to fill the tank, then how much time will each tap take to fill the tank? VIEW SOLUTION
 Question 23
If the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27), then find the ratio of their 9^{th} terms. VIEW SOLUTION
 Question 24
Prove that the lengths of two tangents drawn from an external point to a circle are equal. VIEW SOLUTION
 Question 25
In the given figure, XY and X'Y' are two parallel tangents to circle with centre O and another tangent AB with point of contact C, is intersecting XY at A and X'Y' at B. Prove that ∠AOB = 90°.
VIEW SOLUTION
 Question 26
Construct a triangle ABC with side BC = 7 cm, ∠B = 45°, ∠A = 105°. Then construct another triangle whose sides are $\frac{3}{4}$ times the corresponding sides of the ∆ABC. VIEW SOLUTION
 Question 27
An aeroplane is flying at a height of 300 m above the ground. Flying at this height, the angles of depression from the aeroplane of two points on both banks of a river in opposite directions are 45° and 60° respectively. Find the width of the river. [Use $\sqrt{3}=1\xb7732$] VIEW SOLUTION
 Question 28
If the points A(k + 1, 2k), B(3k, 2k + 3) and C(5k − 1, 5k) are collinear, then find the value of k. VIEW SOLUTION
 Question 29
Two different dice are thrown together. Find the probability that the numbers obtained have
(i) even sum, and
(ii) even product. VIEW SOLUTION
 Question 30
In the given figure, ABCD is rectangle of dimensions 21 cm × 14 cm. A semicircle is drawn with BC as diameter. Find the area and the perimeter of the shaded region in the figure.
VIEW SOLUTION
 Question 31
In a rainwater harvesting system, the rainwater from a roof of 22 m × 20 m drains into a cylindrical tank having diameter of base 2 m and height 3·5 m. If the tank is full, find the rainfall in cm. Write your views on water conservation. VIEW SOLUTION
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