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Board Paper of Class 10 2015 Maths (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.
  • Question 1
    A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is consonant. VIEW SOLUTION
  • Question 2
    In Fig. 1, PA and PB are tangents to the circle with centre O such that ∠APB = 50°. Write the measure of ∠OAB.
     
    Figure 1
    VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 4
    If x=-12, is a solution of the quadratic equation 3x2+2kx-3=0, find the value of k. VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 7
    In Fig. 2, AB is the diameter of a circle with centre O and AT is a tangent. If ∠AOQ = 58°, find ∠ATQ.
     
    Figure 2
     
    VIEW SOLUTION
  • Question 8
    Solve the following quadratic equation for x :

    4x2 - 4a2x + a4 - b4 =0. VIEW SOLUTION
  • Question 9
    Find the ratio in which the point P 34, 512 divides the line segment joining the points A 12, 32 and B(2, −5). VIEW SOLUTION
  • Question 10
    Find the middle term of the A.P. 213, 205, 197, ---, 37. VIEW SOLUTION
  • Question 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 π =227

    Figure 3



     

    VIEW SOLUTION
  • Question 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 16656 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. Use π =227  VIEW SOLUTION
  • Question 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). VIEW SOLUTION
  • Question 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 π=227 and 5=2.236 
    Figure 4
    VIEW SOLUTION
  • Question 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 π=227 
    Figure 5
    VIEW SOLUTION
  • Question 16
    In Fig. 6, find the area of the shaded region [Use π = 3.14]
     
    Figure 6
    VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 18
    If the sum of the first n terms of an A.P. is 123n2 +7n, then find its nth term. Hence write its 20th term. VIEW SOLUTION
  • Question 19
    Three distinct coins are tossed together. Find the probability of getting
    (i) at least 2 heads
    (ii) at most 2 heads VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 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.
     
    Figure 7
    VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 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?

    VIEW SOLUTION
  • Question 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

    (i) divisible by 2 or 3
    (ii) a prime number VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 27

    Solve for x :

    2x+1+32x-2=235x, x0,-1,2 VIEW SOLUTION
  • Question 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. VIEW SOLUTION
  • Question 29
    Prove that the lengths of tangents drawn from an external point to a circle are equal. VIEW SOLUTION
  • Question 30
    Construct an isosceles triangle whose base is 6 cm and altitude 4 cm. Then construct another triangle whose sides are 34times the corresponding sides of the isosceles triangle. VIEW SOLUTION
  • Question 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. VIEW SOLUTION
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