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Board Paper of Class 10 2012 Maths (SET 1) - Solutions

General instructions:
1. All questions are compulsory.
2. The question paper consists of 34 questions divided into four sections A, B, C and
D.
3. Section A contains 10 questions of 1 mark each, which are multiple choices type
questions, Section B contains 8 questions of 2 marks each, Section C contains 10
questions of 3 marks each, Section D contains 6 questions of 4 marks each.
4. There is no overall choice in the paper. However, internal choice is provided in one
question of 2 marks, 3 questions of 3 marks each and two questions of 4 marks each.
5. Use of calculators is not permitted.
  • Question 1

    The roots of the quadratic equation 2x2x − 6 = 0 are

    A.

    B.

    C.

    D.

    VIEW SOLUTION
  • Question 2

    If the nth term of an A.P. is (2n + 1), then the sum of its first three terms is

    A. 6n + 3

    B. 15

    C. 12

    D. 21

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  • Question 3

    From a point Q, 13 cm away from the centre of a circle, the length of tangent PQ to the circle is 12 cm. The radius of the circle (in cm) is

    A. 25

    B.

    C. 5

    D. 1

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  • Question 4

    In Figure 1, AP, AQ and BC are tangents to the circle. If AB = 5 cm, AC = 6 cm and BC

    = 4 cm, then the length of AP (in cm) is

    A. 7.5

    B. 15

    C. 10

    D. 9

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  • Question 5

    The circumference of a circle is 22 cm. The area of its quadrant (in cm2) is

    A.

    B.

    C.

    D.

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  • Question 6

    A solid right circular cone is cut into two parts at the middle of its height by a plane parallel to its base. The ratio of the volume of the smaller cone to the whole cone is

    A. 1 : 2

    B. 1 : 4

    C. 1 : 6

    D. 1 : 8

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  • Question 7

    A kite is flying at a height of 30 m from the ground. The length of string from the kite to the ground is 60 m. Assuming that there is no slack in the string, the angle of elevation of the kite at the ground is

    A. 45°

    B. 30°

    C. 60°

    D. 90°

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  • Question 8

    The Distance of the point (−3, 4) from the x-axis is

    A. 3

    B. −3

    C. 4

    D. 5

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  • Question 9

    In Figure 2, P (5, −3) and Q (3, y) are the points of trisection of the line segment joining A (7, −2) and B (1, −5). Then y equals

    A. 2

    B. 4

    C. −4

    D.

    VIEW SOLUTION
  • Question 10

    Cards bearing numbers 2, 3, 4, ..., 11 are kept in a bag. A card is drawn at random from the bag. The probability of getting a card with a prime number is

    A.

    B.

    C.

    D.

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  • Question 11

    Find the value of p for which the roots of the equation px (x − 2) + 6 = 0, are equal.

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  • Question 12

    How many two-digit numbers are divisible by 3?

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  • Question 13

    In Figure 3, a right triangle ABC, circumscribes a circle of radius r. If AB and BC are of lengths of 8 cm and 6 cm respectively, find the value of r.

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  • Question 14

    Prove that the tangents drawn at the ends of a diameter of a circle are parallel.

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  • Question 15

    In Figure 4, ABCD is a square of side 4 cm. A quadrant of a circle of radius 1 cm is drawn at each vertex of the square and a circle of diameter 2 cm is also drawn. Find the area of the shaded region. (Use π = 3.14)

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  • Question 16

    A solid sphere of radius 10.5 cm is melted and recast into smaller solid cones, each of radius 3.5 cm and height 3 cm.Find the number of cones so formed.

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  • Question 17

    Find the value of k, if the point P (2, 4) is equidistant from the points A(5, k) and B (k, 7).

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  • Question 18

    A card is drawn at random from a well-shuffled pack of 52 cards. Find the probability of getting

    (i) a red king.

    (ii) a queen or a jack.

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  • Question 19

    Solve the following quadratic equation for x:

    x2 − 4axb2 + 4a2 = 0

     

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  • Question 20

    Find the sum of all multiples of 7 lying between 500 and 900.

     

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  • Question 21

    Draw a triangle ABC with BC = 7 cm, ∠ B = 45° and ∠C = 60°. Then construct another triangle, whose sides are times the corresponding sides of ΔABC.

     

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  • Question 22

    In Figure 5, a circle is inscribed in a triangle PQR with PQ = 10 cm, QR = 8 cm and PR =

    12 cm. Find the lengths of QM, RN and PL.

     

     

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  • Question 23

    In Figure 6, O is the centre of the circle with AC = 24 cm, AB = 7 cm and ∠BOD = 90°.

    Find the area of the shaded region. [Use π = 3.14]

     

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  • Question 24

    A hemispherical bowl of internal radius 9 cm is full of water. Its contents are emptied in a cylindrical vessel of internal radius 6 cm. Find the height of water in the cylindrical vessel.

     

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  • Question 25

    The angles of depression of the top and bottom of a tower as seen from the top of a m high cliff are 45° and 60° respectively. Find the height of the tower.

     

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  • Question 26

    Find the coordinates of a point P, which lies on the line segment joining the points A (−2, −2), and B (2, −4), such that .

     

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  • Question 27

    If the points A (x, y), B (3, 6) and C (−3, 4) are collinear, show that x − 3y + 15 = 0.

     

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  • Question 28

    All kings, queens and aces are removed from a pack of 52 cards. The remaining cards are well shuffled and then a card is drawn from it. Find the probability that the drawn card is

    (i) a black face card.

    (ii) a red card.

     

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  • Question 29

    The numerator of a fraction is 3 less than its denominator. If 1 is added to the denominator, the fraction is decreased by .Find the fraction.

    OR

    In a flight of 2800 km, an aircraft was slowed down due to bad weather. Its average speed is reduced by 100 km/h and time increased by 30 minutes. Find the original duration of the flight.

     

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  • Question 30

    Find the common difference of an A. P. whose first term is 5 and the sum of its first four terms is half the sum of the next four terms.

     

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  • Question 31

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

     

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  • Question 32

    A hemispherical tank, full of water, is emptied by a pipe at the rate of litres per sec.

    How much time will it take to empty half the tank if the diameter of the base of the tank is 3 m?

    OR

    A drinking glass is in the shape of the frustum of a cone of height 14 cm. The diameters of its two circular ends are 4 cm and 2 cm. Find the capacity of the glass.

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  • Question 33

    A military tent of height 8.25 m is in the form of a right circular cylinder of base diameter

    30 m and height 5.5 m surmounted by a right circular cone of same base radius. Find the

    length of the canvas used in making the tent, if the breadth of the canvas is 1.5 m.

     

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  • Question 34

    The angles of elevation and depression of the top and bottom of a light-house from the top of a 60 m high building are 30° and 60° respectively. Find

    (i) the difference between the heights of the light-house and the building.

    (ii) the distance between the light-house and the building.

     

    VIEW SOLUTION
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