# Mathematics All India Set 3 2017-2018 CBSE Class 10 Question Paper Solution

Mathematics [All India Set 3]
Marks: 90Academic Year: 2017-2018
Date: March 2018

[1]1

What is the value of (cos2 67° – sin2 23°)?

Concept: Trigonometric Ratios of Complementary Angles
Chapter: [4.02] Trigonometric Identities [4.03] Introduction to Trigonometry
[1]2

In an AP, if the common difference (d) = –4, and the seventh term (a7) is 4, then find the first term.

Concept: nth Term of an AP
Chapter: [2.02] Arithmetic Progressions
[1]3

Given triangle ABC ~ triangle PQR, if (AB)/(PQ) = 1/3, then find (ar  triangle ABC)/(ar triangle PQR)

Concept: Similarity of Triangles
Chapter: [3.02] Triangles
[1]4

What is the HCF of the smallest prime number and the smallest composite number?

Concept: Fundamental Theorem of Arithmetic
Chapter: [1.01] Real Numbers
[1]5

Find the distance of a point P(xy) from the origin.

Concept: Distance Formula
Chapter: [6.01] Lines (In Two-dimensions)
[1]6

If x = 3 is one root of the quadratic equation x2 – 2kx – 6 = 0, then find the value of k.

Concept: Concept of Polynomials
Chapter: [2.04] Polynomials [2.04] Polynomials
[2]7

Two different dice are tossed together. Find the probability :

1) of getting a doublet

2) of getting a sum 10, of the numbers on the two dice.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[2]8

Find the ratio in which P(4, m) divides the line segment joining the points A(2, 3) and B(6, –3). Hence find m.

Concept: Section Formula
Chapter: [6.01] Lines (In Two-dimensions)
[2]9

An integer is chosen at random between 1 and 100. Find the probability that it is

1) divisible by 8.

2) not divisible by 8.

Concept: Basic Ideas of Probability
Chapter: [5.01] Probability [5.01] Probability
[2]10

In Fig. 1, ABCD is a rectangle. Find the value of x and y.

Concept: Equations Reducible to a Pair of Linear Equations in Two Variables
Chapter: [2.01] Pair of Linear Equations in Two Variables
[2]11

Find the sum of first 8 multiples of 3

Concept: Sum of First n Terms of an AP
Chapter: [2.02] Arithmetic Progressions
[2]12

Given that sqrt2 is irrational prove that (5 + 3sqrt2)  is an irrational number

Concept: Concept of Irrational Numbers
Chapter: [1.01] Real Numbers
[3]13 | Attempt Any one
[3]13.1

If A(–2, 1), B(a, 0), C(4, b) and D(1, 2) are the vertices of a parallelogram ABCD, find the values of a and b. Hence find the lengths of its sides

Concept: Coordinate Geometry
Chapter: [6.01] Lines (In Two-dimensions) [6.01] Lines (In Two-dimensions)
[3]13.2

If A(–5, 7), B(–4, –5), C(–1, –6) and D(4, 5) are the vertices of a quadrilateral, find the area of the quadrilateral ABCD

Concept: Area of a Triangle
Chapter: [6.01] Lines (In Two-dimensions)
[3]14

Find all zeroes of the polynomial (2x^4 - 9x^3 + 5x^2 + 3x - 1) if two of its zeroes are (2 + sqrt3)  and (2 - sqrt3)

Concept: Relationship Between Zeroes and Coefficients of a Polynomial
Chapter: [2.04] Polynomials
[3]15

Find HCF and LCM of 404 and 96 and verify that HCF × LCM = Product of the two given numbers.

Concept: Fundamental Theorem of Arithmetic
Chapter: [1.01] Real Numbers
[3]16

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
[3]17 | Attempt Any One
[3]17.1

Prove that the area of an equilateral triangle described on one side of a square is equal to half the area of the equilateral triangle described on one of its diagonals

Concept: Areas of Similar Triangles
Chapter: [3.02] Triangles
[3]17.2

If the areas of two similar triangles are equal, prove that they are congruent

Concept: Areas of Similar Triangles
Chapter: [3.02] Triangles
[3]18

A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.

Concept: Concept of Polynomials
Chapter: [2.04] Polynomials [2.04] Polynomials
[3]19

The table below shows the salaries of 280 persons :

 Salary (In thousand Rs) No. of Persons 5 – 10 49 10 – 15 133 15 – 20 63 20 – 25 15 25 – 30 6 30 – 35 7 35 – 40 4 40 – 45 2 45 – 50 1

Calculate the median salary of the data.

Concept: Median of Grouped Data
Chapter: [5.02] Statistics
[3]20 | Attempt Any One
[3]20.1

A wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in given figure. If the height of the cylinder is 10 cm, and its base is of radius 3.5 cm, find the total surface area of the article [Use π = 22/7]

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]20.2

A heap of rice is in the form of a cone of base diameter 24 m and height 3.5 m. Find the volume of the rice. How much is canvas cloth required to just cover the heap?

Concept: Volume of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]21

Find the area of the shaded region in Fig. 3, where arcs drawn with centres A, B, C and D intersect in pairs at mid-points P, Q, R and S of the sides AB, BC, CD and DA respectively of a square ABCD of side 12 cm. [Use π = 3.14]

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[3]22 | Attempt Any One
[3]22.1

If 4 tan θ = 3, evaluate ((4sin theta - cos theta + 1)/(4sin theta + cos theta - 1))

Concept: Trigonometric Ratios
Chapter: [4.03] Introduction to Trigonometry
[3]22.2

If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A

Concept: Trigonometric Ratios of Complementary Angles
Chapter: [4.02] Trigonometric Identities [4.03] Introduction to Trigonometry
[4]23

As observed from the top of a 100 m high lighthouse from the sea-level, the angles of depression of two ships are 30° and 45°. If one ship is exactly behind the other on the same side of the lighthouse, find the distance between the two ships. [Use sqrt3=1.732]

Concept: Heights and Distances
Chapter: [4.01] Heights and Distances
[4]24

The diameters of the lower and upper ends of a bucket in the form of a frustum of a cone are 10 cm and 30 cm respectively. If its height is 24 cm, find:

1) The area of the metal sheet used to make the bucket.

2) Why we should avoid the bucket made by ordinary plastic? [Use π = 3.14]

Concept: Surface Area of a Combination of Solids
Chapter: [7.02] Surface Areas and Volumes
[4]25

Prove that (sin A - 2sin^3 A)/(2cos^3 A - cos A) = tan A

Concept: Trigonometric Ratios
Chapter: [4.03] Introduction to Trigonometry
[4]26 | Attempt Any One
[4]26.1

The mean of the following distribution is 18. Find the frequency f of class 19 – 21.

 Class 11-13 13-15 15-17 17-19 19-21 21-23 23-25 Frequency 3 6 9 13 f 5 4

Concept: Mean of Grouped Data
Chapter: [5.02] Statistics
[4]26.2

The following distribution gives the daily income of 50 workers of a factory.

 Daily income (in Rs 100 − 120 120 − 140 140 − 160 160 − 180 180 − 200 Number of workers 12 14 8 6 10

Convert the distribution above to a less than type cumulative frequency distribution, and draw its ogive.

Concept: Graphical Representation of Cumulative Frequency Distribution
Chapter: [5.02] Statistics
[4]27 | Attempt Any One
[4]27.1

A motorboat whose speed is 18 km/hr in still water takes 1 hr more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.

Concept: Concept of Polynomials
Chapter: [2.04] Polynomials [2.04] Polynomials
[4]27.2

A train travels at a certain average speed for a distance of 63 km and then travels at a distance of 72 km at an average speed of 6 km/hr more than its original speed. If it takes 3 hours to complete the total journey, what is the original average speed?

Chapter: [2.03] Quadratic Equations
[4]28

The sum of four consecutive numbers in an AP is 32 and the ratio of the product of the first and the last term to the product of two middle terms is 7: 15. Find the numbers.

Concept: Arithmetic Progression
Chapter: [2.02] Arithmetic Progressions
[4]29

Draw a triangle ABC with BC = 6 cm, AB = 5 cm and ∠ABC = 60°. Then construct a triangle whose sides are 3/4 of the corresponding sides of the ∆ABC.

Concept: Constructions Examples and Solutions
Chapter: [3.03] Constructions
[4]30 | Attempt Any One
[4]30.1

In an equilateral triangle ABC, D is a point on side BC such that BD = 1/3BC . Prove that 9 AD2 = 7 AB2

Concept: Right-angled Triangles and Pythagoras Property
Chapter: [3.02] Triangles
[4]30.2

Prove that, in a right triangle, the square on the hypotenuse is equal to the sum of the squares on the other two sides.

Concept: Similarity of Triangles
Chapter: [3.02] Triangles

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