# Mathematics Foreign Set 1 2015-2016 CBSE (English Medium) Class 10 Question Paper Solution

Mathematics [Foreign Set 1]
Marks: 90 Academic Year: 2015-2016
Date & Time: 19th March 2016, 10:30 am
Duration: 3h

[1] 1

In Fig. 1, AOB is a diameter of a circle with centre O and AC is a tangent to the circle at A. If ∠BOC = 130°, the find ∠ACO.

Concept: Tangent to a Circle
Chapter: [3.01] Circles
[1] 2

An observer, 1.7 m tall, is 203–√203 m away from a tower. The angle of elevation from the of observer to the top of tower is 30°. Find the height of tower ?

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[1] 3

For what value of k will the consecutive terms 2k + 1, 3k + 3 and 5k − 1 form an AP?

Concept: Arithmetic Progression
Chapter: [2.02] Arithmetic Progressions
[1] 4

20 tickets, on which numbers 1 to 20 are written, are mixed thoroughly and then a ticket is drawn at random out of them. Find the probability that the number on the drawn ticket is a multiple of 3 or 7 ?

Concept: Probability - A Theoretical Approach
Chapter: [5.01] Probability
[2] 5

A two digit number is four times the sum of the digits. It is also equal to 3 times the product of digits. Find the number ?

Chapter: [2.03] Quadratic Equations
[2] 6

Find the ratio in which the point (−3, k) divides the line-segment joining the points (−5, −4) and (−2, 3). Also find the value of k ?

Concept: Coordinate Geometry
Chapter: [6.01] Lines (In Two-dimensions) [6.01] Lines (In Two-dimensions)
[2] 7

In Fig. 2, from a point P, two tangents PT and PS are drawn to a circle with centre O such that ∠SPT = 120°, Prove that OP = 2PS ?

Concept: Number of Tangents from a Point on a Circle
Chapter: [3.01] Circles
[2] 8

Prove that the points (2, −2), (−2, 1) and (5, 2) are the vertices of a right angled triangle. Also find the area of this triangleb ?

Concept: Areas of Similar Triangles
Chapter: [3.02] Triangles
[2] 9

If the ratio of sum of the first m and n terms of an AP is m2 : n2, show that the ratio of its  mth and nth terms is (2m − 1) : (2n − 1) ?

Concept: Sum of First n Terms of an A.P.
Chapter: [2.02] Arithmetic Progressions
[2] 10

In fig. 3 are two concentric circles of radii 6 cm and 4 cm with centre O. If AP is a tangent to the larger circle and BP to the smaller circle and length of AP is 8 cm, find the length of BP ?

Concept: Concept of Circle - Centre, Radius, Diameter, Arc, Sector, Chord, Segment, Semicircle, Circumference, Interior and Exterior, Concentric Circles
Chapter: [3.01] Circles [3.01] Circles
[3] 11

Find the area of shaded region in Fig. 4, where a circle of radius 6 cm has been drawn with vertex O of an equilateral triangle OAB of side 12 cm. (Use π = 3.14 and$\sqrt{3}$ =1.73)

Concept: Areas of Combinations of Plane Figures
Chapter: [7.01] Areas Related to Circles
[3] 12

A hemispherical tank, of diameter 3 m, is full of water. It is being emptied by a pipe at the rate of $3\frac{4}{7}$ litre per second. How much time will it take to make the tank half empty?$\left[ Use \pi = \frac{22}{7} \right]$

Concept: Volume of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3] 13

If the point C (–1, 2) divides internally the line-segment joining the points A (2, 5) and B (xy) in the ratio 3 : 4, find the value of x2 + y2 ?

Concept: Section Formula
Chapter: [6.01] Lines (In Two-dimensions)
[3] 14

In fig. 5 is a chord AB of a circle, with centre O and radius 10 cm, that subtends a right angle at the centre of the circle. Find the area of the minor segment AQBP. Hence find the area of major segment ALBQA. (use π = 3.14)

Concept: Tangent to a Circle
Chapter: [3.01] Circles
[3] 15

Divide 56 in four parts in AP such that the ratio of the product of their extremes (1st and 4th) to the product of means (2nd and 3rd) is 5 : 6 ?

Concept: nth Term of an AP
Chapter: [2.02] Arithmetic Progressions
[3] 16

Solve the given quadratic equation for x : 9x2 – 9(a + b)x + (2a2 + 5ab + 2b2) = 0 ?

Concept: Solutions of Quadratic Equations by Factorization
Chapter: [2.03] Quadratic Equations
[3] 17

A cylindrical tub, whose diameter  is 12 cm and height 15 cm is full of ice-cream. The whole ice-cream is to be divided into 10 children in equal ice-cream cones, with conical base surmounted by hemispherical top. If the height of conical portion is twice the diameter of base, find the diameter of conical part of ice-cream cone ?

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3] 18

A metal container, open from the top, is in the shape of a frustum of a cone of height 21 cm with radii of its lower and upper circular ends as 8 cm and 20 cm respectively. Find the cost of milk which can completely fill the container at the rate of Rs 35 per litre.$\left[ Use \pi = \frac{22}{7} \right]$

Concept: Frustum of a Cone
Chapter: [7.02] Surface Areas and Volumes
[3] 19

Two men on either side of a 75 m high building and in line with base of building observe the angles of elevation of the top of the building as 30° and 60°. Find the distance between the two men. (Use$\sqrt{3} = 1 . 73$)

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[3] 20

A game consist of tossing a one-rupee coin 3 times and noting the outcome each time. Ramesh will win the game if all the tosses show the same result, (i.e. either all thee heads or all three tails) and loses the game otherwise. Find the probability that Ramesh will lose the game.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[4] 21

A pole has to be erected at a point on the boundary of a circular park of diameter 13 meters in such a way that the difference of its distances from two diametrically opposite fixed gates A and B on the boundary is 7 meters. Is it the possible to do so? If yes, at what distances from the two gates should the pole be erected?

Concept: Solutions of Quadratic Equations by Factorization
Chapter: [2.03] Quadratic Equations
[4] 22

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

Concept: Number of Tangents from a Point on a Circle
Chapter: [3.01] Circles
[4] 23

Draw a ∆ABC in which AB = 4 cm, BC = 5 cm and AC = 6 cm. Then construct another triangle whose sides are$\frac{3}{5}$  of the corresponding sides of ∆ABC ?

Concept: Division of a Line Segment
Chapter: [3.03] Constructions
[4] 24

In fig. 6, AB is a chord of a circle, with centre O, such that AB = 16 cm and radius of circle is 10 cm. Tangents at A and B intersect each other at P. Find the length of PA ?

Concept: Areas of Sector and Segment of a Circle
Chapter: [7.01] Areas Related to Circles
[4] 25

Find the positive value(s) of k for which quadratic equations x2 + kx + 64 = 0 and x2 – 8x + k = 0 both will have real roots ?

Concept: Nature of Roots of a Quadratic Equation
Chapter: [2.03] Quadratic Equations
[4] 26

A vertical tower stands on a horizontal plane and is surmounted by a flagstaff of height 5 m. From a point on the ground the angles of elevation of the top and bottom of the flagstaff are 60° and 30° respectively. Find the height of the tower and the distance of the point from the tower. (take$\sqrt{3}$= 1.732)

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[4] 27

Reshma wanted to save at least Rs 6,500 for sending her daughter to school next year (after 12 month.) She saved Rs 450 in the first month and raised her savings by Rs 20 every next month. How much will she be able to save in next 12 months? Will she be able to send her daughter to the school next year?
What value is reflected in this question ?

Concept: nth Term of an AP
Chapter: [2.02] Arithmetic Progressions
[4] 28

The co-ordinates of the points A, B and C are (6, 3), (−3, 5) and (4, −2) respectively. P(xy) is any point in the plane. Show that $\frac{ar\left( ∆ PBC \right)}{ar\left( ∆ ABC \right)} = \left| \frac{x + y - 2}{7} \right|$

Concept: Application of Pythagoras Theorem in Acute Angle and Obtuse Angle
Chapter: [3.02] Triangles
[4] 29

In fig. 7 is shown a disc on which a player spins an arrow twice. The fraction a/b is formed, where 'a' is the number of sector on which arrow stops on the first spin and 'b' is the number of the sector in which the arrow stops on second spin. On each spin, each sector has equal chance of selection by the arrow. Find the probability that the fraction  a/b>1.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[4] 30

Find the area of the shaded region in Fig. 8, where \\

$\overbrace{APD}$,$\overbrace{AQB}$,$\overbrace{BRC}$ and $\overbrace{CSD}$ are semi-circles of diameter 14 cm, 3.5 cm, 7 cm and 3.5 cm respectively.$\left[ Use \pi = \frac{22}{7} \right]$
Concept: Number of Tangents from a Point on a Circle
Chapter: [3.01] Circles
[4] 31

In fig. 9 is shown a right circular cone of height 30 cm. A small cone is cut off from the top by a plane parallel to the base. If the volume of the small cone is 127127 of the volume of cone, find at what height above the base is the section made.

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances

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