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Mathematics Standard - Delhi Set 3 2021-2022 English Medium Class 10 Question Paper Solution

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Mathematics [Standard - Delhi Set 3]
Marks: 40 CBSE
English Medium

Academic Year: 2021-2022
Date & Time: 5th May 2022, 10:30 am
Duration: 2h
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General Instructions :

  1. This question paper contains of 14 questions. All questions are compulsory.
  2. This question paper is divided into four sections -A, B, C, and D.
  3. Section A contains 6 questions (Q No.1 to 6) of 2 marks each. Internal choice has been provided in two questions.
  4. Section B contains 4 questions (Q No. 7 to 10) of 3 marks each. Internal choice has been provided in one question.
  5. Section C contains 4 questions (Q No. 11 to 14) of 4 marks each. An internal choice has been provided in one question. It also contains two case study board questions.
  6.  Use of calculator is not permitted.

SECTION - A
[2]1 | Question Number 1 to 6 carry 2 marks each.

Solve the quadratic equation: `x^2 + 2sqrt(2)x - 6` = 0 for x.

Concept: undefined - undefined
Chapter: [0.023] Quadratic Equations
[2]2
[2]2.a

Which term of the A.P. `-11/2, -3, -1/2`.... is `49/2`?

Concept: undefined - undefined
Chapter: [0.024] Arithmetic Progressions
OR
[2]2.b

Find a and b so that the numbers a, 7, b, 23 are in A.P.

Concept: undefined - undefined
Chapter: [0.024] Arithmetic Progressions
[2]3
[2]3.a

In an A.P. if the sum of third and seventh term is zero. Find its 5th term.

Concept: undefined - undefined
Chapter: [0.024] Arithmetic Progressions
OR
[2]3.b

Determine the A.P. whose third term is 5 and the seventh term is 9.

Concept: undefined - undefined
Chapter: [0.024] Arithmetic Progressions
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[2]4
[2]4.a

In the given figure, AB is diameter of a circle centered at O. BC is tangent to the circle at B. If OP bisects the chord AD and ∠AOP = 60°, then find ∠C.

Concept: undefined - undefined
Chapter: [0.042] Circles
OR
[2]4.b

In the given figure, XAY is a tangent to the circle centered at O. If ∠ABO = 40°, then find ∠BAY and ∠AOB.

Concept: undefined - undefined
Chapter: [0.042] Circles
[2]5

Solve the quadratic equation: x2 – 2ax + (a2 – b2) = 0 for x.

Concept: undefined - undefined
Chapter: [0.023] Quadratic Equations
[2]6

Find the sum of first 20 terms of an A.P. whose nth term is given as an = 5 – 2n.

Concept: undefined - undefined
Chapter: [0.024] Arithmetic Progressions
SECTION - B
[3]7 | Question Numbers 7 to 10 carry 3 marks each.

Draw two concentric circles of radii 2 cm and 3 cm. From a point on the outer circle, construct a pair of tangents to the inner circle.

Concept: undefined - undefined
Chapter: [0.042] Circles
[3]8

From a point on a bridge across a river, the angles of depression of the banks on opposite sides of the river are 30° and 45°. If the bridge is at a height of 8 m from the banks, then find the width of the river.

Concept: undefined - undefined
Chapter: [0.053] Some Applications of Trigonometry
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[3]9

Two men on either side of a cliff 75 m high observe the angles of elevation of the top of the cliff to be 30° and 60°. Find the distance between the two men.

Concept: undefined - undefined
Chapter: [0.053] Some Applications of Trigonometry
[3]10

Construct a pair of tangents to a circle of radius 4 cm from a point P lying outside the circle at a distance of 6 cm from the centre.

Concept: undefined - undefined
Chapter: [0.033] Constructions
SECTION - C
[4]11 | Question Numbers 11 to 14 carry 4 marks each.
[4]11.a

The sum of two numbers is 34. If 3 is subtracted from one number and 2 is added to another, the product of these two numbers becomes 260. Find the numbers.

Concept: undefined - undefined
Chapter: [0.022000000000000002] Pair of Linear Equations in Two Variables
OR
[4]11.b

The hypotenuse (in cm) of a right angled triangle is 6 cm more than twice the length of the shortest side. If the length of third side is 6 cm less than thrice the length of shortest side, then find the dimensions of the triangle.

Concept: undefined - undefined
Chapter: [0.040999999999999995] Triangles
[4]12

Prove that a parallelogram circumscribing a circle is a rhombus.

Concept: undefined - undefined
Chapter: [0.042] Circles
[4]13 | Case Study - 1

Read the following passage and answer the questions given below.

Kite Festival

Kite festival is celebrated in many countries at different times of the year. In India, every year 14th January is celebrated as International Kite Day. On this day many people visit India and participate in the festival by flying various kinds of kites.

The picture given below, show three kites flying together.

In the given figure, the angles of elevation of two kites (Points A and B) from the hands of a man (Point C) are found to be 30° and 60° respectively. Taking AD = 50 m and BE = 60 m, find.

  1. the lengths of strings used (take them straight) for kites A and B as shown in the figure.
  2. the distance 'd' between these two kites.
Concept: undefined - undefined
Chapter: [0.053] Some Applications of Trigonometry
[4]14 | Case Study - 2

Read the following passage and answer the questions given below.

A 'circus' is a company of performers who put on shows of acrobats, clowns etc. to entertain people started around 250 years back, in open fields, now generally performed in tents.

One such 'Circus Tent' is shown below.

The tent is in the shape of a cylinder surmounted by a conical top. If the height and diameter of cylindrical part are 9 m and 30 m respectively and height of conical part is 8 m with same diameter as that of the cylindrical part, then find

  1. the area of the canvas used in making the tent;
  2. the cost of the canvas bought for the tent at the rate ₹ 200 per sq m, if 30 sq m canvas was wasted during stitching.
Concept: undefined - undefined
Chapter: [0.062] Surface Areas and Volumes

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