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Class X: Math, Board Paper 2015, Set-2

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
  • Q1

    A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is consonant. 

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  • Q2

    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
     

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  • Q3

    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. 

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  • Q4

    If x=-12, is a solution of the quadratic equation 3x2+2kx-3=0, find the value of k. 

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  • Q5

    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. 

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  • Q6

    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. 

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  • Q7

    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
     

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  • Q8

    Solve the following quadratic equation for x :

    4x2 - 4a2x + a4 - b4 =0. 

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  • Q9

    Find the ratio in which the point P 34, 512 divides the line segment joining the points A 12, 32 and B(2, −5). 

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  • Q10

    Find the middle term of the A.P. 213, 205, 197, ---, 37. 

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  • Q11

    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
     

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  • Q12

    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 

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  • Q13

    Find the area of the triangle ABC with A(1, −4) and mid-points of sides through A being (2, −1) and (0, −1). 

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  • Q14

    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
     

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  • Q15

    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
     

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  • Q16

    In Fig. 6, find the area of the shaded region [Use π = 3.14]
     

    Figure 6
     

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  • Q17

    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. 

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  • Q18

    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. 

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  • Q19

    Three distinct coins are tossed together. Find the probability of getting
    (i) at least 2 heads
    (ii) at most 2 heads 

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  • Q20

    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. 

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  • Q21

    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
     

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  • Q22

    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. 

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  • Q23

    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?

     

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  • Q24

    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 

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  • Q25

    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. 

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  • Q26

    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. 

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  • Q27

    Solve for x :

    2x+1+32x-2=235x, x0,-1,2 

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  • Q28

    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. 

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  • Q29

    Prove that the lengths of tangents drawn from an external point to a circle are equal. 

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  • Q30

    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. 

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  • Q31

    If P(–5, –3), Q(–4, –6), R(2, –3) and S(1, 2) are the vertices of a quadrilateral PQRS, find its area. 

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