Board Paper of Class 10 2013 Maths Delhi(SET 1)  Solutions
(i) All questions are compulsory.
(ii) The question paper consists of 34 questions divided into four sections A, B, C and D.
(iii) Sections A contains 8 questions of one mark each, which are multiple choice type questions, section B contains 6 questions of two marks each, section C contains 10 questions of three marks each, and section D contains 10 questions of four marks each.
(iv) Use of calculators is not permitted.
 Question 1
 Question 2
In Fig. 1, PA and PB are two tangents drawn from an external point P to a circle with centre C and radius 4 cm. If PA ⊥ PB, then the length of each tangent is:
(A) 3 cm
(B) 4 cm
(C) 5 cm
(D) 6 cm
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 Question 3
In Fig.2, a circle with centre O is inscribed in a quadrilateral ABCD such that, it touches the sides BC, AB, AD and CD at points P, Q, R and S respectively, If AB = 29 cm, AD = 23 cm, ∠B = 90° and DS = 5 cm, then the radius of the circle (in cm.) is:
(A) 11
(B) 18
(C) 6
(D) 15
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 Question 4
The angle of depression of a car, standing on the ground, from the top of a 75 m high tower, is 30°. The distance of the car from the base of the tower (in m.) is:
(A)
(B)
(C)
(D) 150
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 Question 5
The probability of getting an even number, when a die is thrown once, is :
(A)
(B)
(C)
(D)
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 Question 6
A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears a primenumber less than 23, is :
(A)
(B)
(C)
(D)
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 Question 7
 Question 8
If the difference between the circumference and the radius of a circle is 37 cm, then using, the circumference (in cm) of the circle is:
(A) 154
(B) 44
(C) 14
(D) 7
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 Question 9
Solve the following quadratic equation for x:
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 Question 10
How many three − digit natural numbers are divisible by 7?
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 Question 11
In Fig. 4, a circle inscribed in triangle ABC touches its sides AB, BC and AC at points D, E and F respectively. If AB = 12 cm, BC = 8 cm and AC = 10 cm, then find the lengths of AD, BE and CF.
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 Question 12
Prove that the parallelogram circumscribing a circle is a rhombus.
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 Question 13
A card is drawn at random from a well shuffled pack of 52 playing cards.
Find the probability that the drawn card is neither a king nor a queen.
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 Question 14
Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular card board of dimensions 14 cm × 7 cm. Find the area of the remaining card board.
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 Question 15
For what value of k, are the roots of the quadratic equation kx (x − 2) + 6 = 0 equal?
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 Question 16
Find the number of terms of the AP 18, 13, ….., and find the sum of all its terms.
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 Question 17
Construct a triangle with sides 5 cm, 4 cm and 6 cm. Then construct another triangle whose sides are times the corresponding sides of first triangle.
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 Question 18
The horizontal distance between two poles is 15 m. The angle of depression of the top of first pole as seen from the top of second pole is 30°. If the height of the second pole is 24 m, find the height of the first pole.
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 Question 19
Prove that the points (7, 10), (−2, 5) and (3, −4) are the vertices of an isosceles right triangle.
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 Question 20
Find the ratio in which the yaxis divides the line segment joining the points (−4, − 6) and (10, 12). Also find the coordinates of the point of division.
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 Question 21
In Fig.5, AB and CD are two diameters of a circle with centre O, which are perpendicular to each other. OB is the diameter of the smaller circle. If OA = 7 cm, find the area of the shaded region.
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 Question 22
A vessel is in the form of hemispherical bowl surmounted by a hollow cylinder of same diameter. The diameter of the hemispherical bowl is 14 cm and the total height of the vessel is 13 cm. Find the total surface area of the vessel.
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 Question 23
A wooden toy was made by scooping out a hemisphere of same radius from each end of a solid cylinder. If the height of the cylinder is 10 cm, and its base is of radius 3.5 cm, find the volume of wood in the toy.
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 Question 24
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find: (i) the length of the arc (ii) area of the sector formed by the arc.
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 Question 25
Solve the following for x:
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 Question 26
Sum of the areas of two squares is 400 cm^{2}. If the difference of their perimeters is 16 cm, find the sides of the two squares.
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 Question 27
If the sum of first 7 terms of an AP is 49 and that of first 17 terms is 289, find the sum of its first n terms.
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 Question 28
Prove that the tangent at any point of a circle is perpendicular to the radius through the point of contact.
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 Question 29
In fig. 6, l and m are two parallel tangents to a circle with centre O, touching the circle at A and B respectively. Another tangent at C intersects the line l at D and m at E. Prove that ∠DOE = 90°.
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 Question 30
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 60°. If the tower is 60 m high, find the height of the building.
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 Question 31
A Group consists of 12 persons, of which 3 are extremely patient, other 6 are extremely honest and rest are extremely kind. A person from the group is selected at random. Assuming that each person is equally likely to be selected, find the probability of selecting a person who is (i) extremely patient (ii) extremely kind or honest.
Which of the above values you prefer more?
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 Question 32
The three vertices of a parallelogram ABCD are A(3, −4), B(−1, −3) and C(−6, 2). Find the coordinates of vertex D and find the area of ABCD.
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 Question 33
Water is flowing through a cylindrical pipe, of internal diameter 2 cm, into a cylindrical tank of base radius 40 cm, at the rate of 0.4 m/s. Determine the rise in level of water in the tank in half an hour.
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 Question 34
A bucket open at the top, and made up of a metal sheet is in the form of a frustum of a cone. The depth of the bucket is 24 cm and the diameters of its upper and lower circular ends are 30 cm and 10 cm respectively. Find the cost of metal sheet used in it at the rate of Rs 10 per 100 cm^{2}. [Use π = 3.14]
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