Board Paper of Class 10 2011 Maths (SET 1)  Solutions
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 equation x^{2} − 3x − m (m + 3) = 0, where m is a constant, are
A. m, m + 3
B. − m, m + 3
C. m, − (m + 3)
D. −m, − (m + 3)
VIEW SOLUTION
 Question 2
If the common differences of an A.P. is 3, then a_{20} − a_{15} is
A. 5
B. 3
C. 15
D. 20
VIEW SOLUTION
 Question 3
In figure 1, O is the centre of a circle, PQ is a chord and PT is the tangent at P.
If ∠POQ = 70°, then ∠TPQ is equal to
A. 55°
B. 70°
C. 45°
D. 35°
 Question 4
In Figure 2, AB and AC are tangents to the circle with centre O such that
∠BAC = 40°. Then ∠BOC is equal to
A. 40°
B. 50°
C. 140°
D. 150°
 Question 5
The perimeter (in cm) of a square circumscribing a circle of radius a cm, is
A. 8 a
B. 4 a
C. 2 a
D. 16 a
 Question 6
The radius (in cm) of the largest right circular cone that can be cut out from a cube of edge 4.2 cm is
A. 4.2
B. 2.1
C. 8.4
D. 1.05
 Question 7
A tower stands vertically on the ground. From a point on the ground which is 25 m away from the foot of the tower, the angle of elevation of the top of the tower is found to be 45°. Then the height (in meters) of the tower is
A.
B.
C. 25
D. 12.5
 Question 8
If is the midpoint of the linesegment joining the points A (−6, 5) and B(−2, 3), then the value of a is
A. −8
B. 3
C. −4
D. 4
 Question 9
If A and B are the points (−6, 7) and (−1, −5) respectively, then the distance
2AB is equal to
A. 13
B. 26
C. 169
D. 238
 Question 10
A card is drawn from a wellshuffled deck of 52 playing cards. The probability that the card will not be an ace is
A.
B.
C.
D.
 Question 11
Find the value of m so that the quadratic equation mx (x − 7) + 49 = 0 has two equal roots.
VIEW SOLUTION
 Question 12
Find how many twodigit numbers are divisible by 6.
VIEW SOLUTION
 Question 13
In Figure 3, a circle touches all the four sides of a quadrilateral ABCD whose sides are AB = 6 cm, BC = 9 cm and CD = 8 cm. Find the length of the side AD.
 Question 14
Draw a line segment AB of length 7 cm. Using ruler and compasses, find a point P on AB such that .
VIEW SOLUTION
 Question 15
Find the perimeter of the shaded region in Figure 4, if ABCD is a square of side 14 cm and APB and CPD are semicircles.
 Question 16
Two cubes each of volume 27 cm^{3} are joined end to end to form a solid. Find the surface area of the resulting cuboid.
OR
A cone of height 20 cm and radius of base 5 cm is made up of modeling clay.
A child reshapes it in the form of a sphere. Find the diameter of the sphere.
VIEW SOLUTION
 Question 17
Find the value of y for which the distance between the points A (3, −1) and B (11, y) is 10 units.
VIEW SOLUTION
 Question 18
A ticket is drawn at random from a bag containing tickets numbered from 1 to 40. Find the probability that the selected ticket has a number which is a multiple of 5.
VIEW SOLUTION
 Question 19
Find the roots of the following quadratic equation:
VIEW SOLUTION
 Question 20
Find the A.P. whose fourth term is 9 and the sum of its sixth term and thirteenth term is 40.
VIEW SOLUTION
 Question 21
In Figure 5, a triangle PQR is drawn to circumscribe a circle of radius 6 cm such that the segments QT and TR into which QR is divided by the point of contact T, are of lengths 12 cm and 9 cm respectively. If the area of ΔPQR = 189 cm^{2}, then find the lengths of sides PQ and PR.
VIEW SOLUTION
 Question 22
Draw a pair of tangents to a circle of radius 3 cm, which are inclined to each other at an angle of 60°.
OR
Draw a right triangle in which the sides (other than hypotenuse) are of lengths 4 cm and 3 cm. Then construct another triangle whose sides are times the corresponding sides of the given triangle.
VIEW SOLUTION
 Question 23
A chord of a circle of radius 14 cm subtends an angle of 120° at the centre. Find the area of the corresponding minor segment of the circle.
VIEW SOLUTION
 Question 24
An open metal bucket is in the shape of a frustum of a cone of height 21 cm with radii of its lower and upper ends as 10 cm and 20 cm respectively. Find the cost of milk which can completely fill the bucket at Rs. 30 per litre.
 Question 25
Point P(x, 4) lies on the line segment joining the points A(−5, 8) and B(4, −10). Find the ratio in which point P divides the line segment AB. Also find the value of x.
 Question 26
Find the area of the quadrilateral ABCD, whose vertices are A(−3, −1), B (−2, −4), C(4, − 1) and D (3, 4).
OR
Find the area of triangle formed by joining the midpoints of the sides of the triangle whose vertices are A(2, 1), B(4, 3) and C(2, 5).
VIEW SOLUTION
 Question 27
From the top of a vertical tower, the angles of depression of two cars, in the same straight line with the base of the tower, at an instant are found to be 45° and 60°. If the cars are 100 m apart and are on the same side of the tower, find the height of the tower.
 Question 28
Two dice are rolled once. Find the probability of getting such numbers on the two dice, whose product is 12.
OR
A box contains 80 discs which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a perfect square number.
VIEW SOLUTION
 Question 29
Prove that the tangent at any point of a circle is perpendicular to the radius through the point of contact.
 Question 30
The first and the last terms of an A.P. are 8 and 350 respectively. If its common difference is 9, how many terms are there and what is their sum?
OR
How many multiples of 4 lie between 10 and 250? Also find their sum.
VIEW SOLUTION
 Question 31
A train travels 180 km at a uniform speed. If the speed had been 9 km/hour more, it would have taken 1 hour less for the same journey. Find the speed of the train.
OR
Find the roots of the equation .
VIEW SOLUTION
 Question 32
In Figure 6, three circles each of radius 3.5 cm are drawn in such a way that each of them touches the other two. Find the area enclosed between these three circles (shaded region).
VIEW SOLUTION
 Question 33
Water is flowing at the rate of 15 km/hour through a pipe of diameter 14 cm into a cuboidal pond which is 50 m long and 44 m wide. In what time will the level of water in the pond rise by 21 cm?
 Question 34
The angle of elevation of the top of a vertical tower from a point on the ground is 60°. From another point 10 m vertically above the first, its angle of elevation is 30°. Find the height of the tower.

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