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Mathematics Standard Official Delhi set 1 2024-2025 English Medium Class 10 Question Paper Solution

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Mathematics [Standard Official Delhi set 1]
Marks: 80 CBSE
English Medium

Academic Year: 2024-2025
Date & Time: 10th March 2025, 10:30 am
Duration: 3h
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General Instructions:

  1. This question paper contains 38 questions. All questions are compulsory.
  2. This Question Paper is divided into FIVE Sections - Section A, B, C, D, and E.
  3. In Section - A question number 1 to 18 are Multiple Choice Questions (MCQs) and question number 19 & 20 are Assertion Reason based question of 1 mark each.
  4. In Section - B questions number 21 to 25 are Very Short-Answer-I (SA-I) type questions of 2 marks each.
  5. In Section - C questions number 26 to 31 are Short Answer-II (SA-II) type questions carrying 3 marks each.
  6. In Section - D questions number 32 to 35 are Long Answer (LA) type questions carrying 5 marks each.  
  7. In Section - E questions number 36 to 38 are Case Study/Passage based integrated units and assessment questions carrying 4 marks each. Internal choice is provided in 2 marks questions in each case study. 
  8. There is no overall choice. However, an internal choice has been provided in 2 questions in Section - B, 2 questions in Section - C, 2 questions in Section - D, and 3 questions in Section - E. 
  9. Draw neat figures wherever required. Take π = `22/7` wherever required if not stated.
  10. Use of a calculator is NOT allowed.

SECTION - A : (This section consists of 20 multiple choice questions of 1 mark each).
[1]1

If x = ab3 and y = a3b, where a and b are prime numbers, then [HCF (x, y) – LCM (x, y)] is equal to ______.

1 − a3b3

ab (1 − ab)

ab − a4b4

ab (1− ab) (1 + ab)

Concept: undefined - undefined
Chapter:
[1]2

`(1 + sqrt3)^2 -  (1 - sqrt3)^2` is ______.

a positive rational number

a negative integer

a positive irrational number

a negative irrational number

Concept: undefined - undefined
Chapter:
[1]3

The value of ‘a’ for which ax2 + x + a = 0 has equal and positive roots is ______.

2

−2

`1/2`

`-1/2`

Concept: undefined - undefined
Chapter:
[1]4

The distance of a point A from the x-axis is 3 units. Which of the following cannot be coordinates of the point A?

(1, 3)

(−3, −3)

(−3, 3)

(3, 1)

Concept: undefined - undefined
Chapter:
[1]5

The number of red balls in a bag is 10 more than the number of black balls. If the probability of drawing a red ball at random from this bag is `3/5`, then the total number of balls in the bag is ______.

50

60

80

40

Concept: undefined - undefined
Chapter:
[1]6

The value of ‘p’ for which the equations px + 3y = p − 3, 12x + py = p has infinitely many solutions is ______.

−6 only

6 only

± 6

Any real number except ± 6.

Concept: undefined - undefined
Chapter:
[1]7

ΔABC and ΔPQR are shown in the adjoining figures. The measure of ∠C is:

140°

80°

60°

40°

Concept: undefined - undefined
Chapter:
[1]8

tan 2A = 3 tan A is true, when the measure of ∠A is ______.

90°

60°

45°

30°

Concept: undefined - undefined
Chapter:
[1]9

Which of the following statement is true?

sin 20° > sin 70°

sin 20° > cos 20°

cos 20° > cos 70°

tan 20° > tan 70°

Concept: undefined - undefined
Chapter:
[1]10

A 30 m long rope is tightly stretched and tied from the top of the pole to the ground. If the rope makes an angle of 60° with the ground, the height of the pole is ______.

`10sqrt3` m

`30sqrt3` m

15 m

`15sqrt3` m

Concept: undefined - undefined
Chapter:
[1]11

On the top face of the wooden cube of side 7 cm, hemispherical depressions of radius 0.35 cm are to be formed by taking out the wood. The maximum number of depressions that can be formed is ______.

400

100

20

10

Concept: undefined - undefined
Chapter:
[1]12

The cumulative frequency for calculating median is obtained by adding the frequencies of all the ______.

classes up to the median class

classes following the median class

classes preceding the median class

all classes

Concept: undefined - undefined
Chapter:
[1]13

If the mean and median of a given set of observations are 10 and 11 respectively, then the value of the mode is ______.

10.5

8

13

21

Concept: undefined - undefined
Chapter:
[1]14

In the adjoining figure, AB is the chord of the larger circle touching the smaller circle. The centre of both the circles is O. If AB = 2r and OP = r, then the radius of the larger circle is:

2r

3r

`2sqrt2 r`

`sqrt2 r`

Concept: undefined - undefined
Chapter:
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[1]15

A parallelogram having one of its sides 5 cm circumscribes a circle. The perimeter of a parallelogram is ______.

20 cm

less than 20 cm

more than 20 cm but less than 40 cm

40 cm

Concept: undefined - undefined
Chapter:
[1]16

E and F are points on the sides AB and AC, respectively, of a ΔABC, such that `(AE)/(EB) = (AF)/(FC) = 1/2`. Which of the following relations is true?

EF = 2BC

BC = 2EF

EF = 3ВС

BC = 3EF

Concept: undefined - undefined
Chapter:
[1]17

Which of the following statements is true for a polynomial p(x) of degree 3?

p(x) has at most two distinct zeroes.

p(x) has at least two distinct zeroes.

p(x) has exactly three distinct zeroes.

p(x) has at most three distinct zeroes.

Concept: undefined - undefined
Chapter:
[1]18

A pair of dice is thrown. The probability that the sum of numbers appearing on top faces is at most 10 is ______.

`1/11`

`10/11`

`5/6`

`11/12`

Concept: undefined - undefined
Chapter:
Question numbers 19 and 20 are Assertion and Reason based questions. Two statements are given, one labelled as Assertion (A) and the other is labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
[1]19

Assertion (A): 4n ends with the digit 0 for some natural number n.

Reason (R): For a number ‘x’ having 2 and 5 as its prime factors, xn always ends with the digit 0 for every natural number n.

Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

Concept: undefined - undefined
Chapter:
[1]20

Assertion (A): Tangents drawn at the end points of a diameter of a circle are always parallel to each other.

Reason (R): The lengths of tangents drawn to a circle from a point outside the circle are always equal.

Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

Concept: undefined - undefined
Chapter:
SECTION - B : (This section has 5 very short answer type questions of 2 marks each).
[2]21

Solve the following system of equations algebraically:

30x + 44y = 10; 40x + 55y = 13

Concept: undefined - undefined
Chapter:
[2]22. (A)

A 1.5 m tall boy is walking away from the base of a lamp post which is 12 m high, at the speed of 2.5 m/sec. Find the length of his shadow after 3 seconds.

Concept: undefined - undefined
Chapter:
OR
[2]22. (B)

In the parallelogram ABCD, side AD is produced at point E, and BE intersects CD at point F. Prove that ΔABE ∼ ΔCFB.

Concept: undefined - undefined
Chapter:
[2]23

Find the coordinates of the point C, which lies on the line AB produced such that AC = 2BС, where the coordinates of points A and B are (–1, 7) and (4, –3), respectively.

Concept: undefined - undefined
Chapter:
[2]24. (A)

Find the value of x for which (sin A + cosec A)2 + (cos A + sec A)2 = x + tan2 A + cot2 A.

Concept: undefined - undefined
Chapter:
OR
[2]24. (B)

Evaluate the following:

`(3 sin 30° - 4 sin^3 30°)/(2 sin^2 50° + 2 cos^2 50°)`

Concept: undefined - undefined
Chapter:
[2]25

Two friends Anil and Ashraf were born in the December month in the year 2010. Find the probability that:

  1. They share the same date of birth.
  2. They have different dates of birth.
Concept: undefined - undefined
Chapter:
SECTION - C : (This section has 6 short answer type questions of 3 marks each)
[3]26. (A)

Prove that `sqrt(2)` is an irrational number.

Concept: undefined - undefined
Chapter:
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OR
[3]26. (B)

Let x and y be two distinct prime numbers, and p = x2y3, q = xy4, r = x5y2. Find the HCF and LCM of p, q, and r. Further check if HCF (p, q, r) × LCM (p, q, r) = p × q× r or not.

Concept: undefined - undefined
Chapter:
[3]27

The monthly incomes of two persons are in the ratio 9 : 7 and their monthly expenditures are in the ratio 4 : 3. If each saved ₹ 5,000, express the given situation algebraically as a system of linear equations in two variables. Hence, find their respective monthly incomes.

Concept: undefined - undefined
Chapter:
[3]28

Р(x, y), Q(–2, –3), and R(2, 3) are the vertices of a right triangle PQR right-angled at P. Find the relationship between x and y. Hence, find all possible values of x for which y = 2.

Concept: undefined - undefined
Chapter:
[3]29. (A)

Prove that `(cosA + sinA - 1)/(cosA - sinA + 1)` = cosec A − cot A.

Concept: undefined - undefined
Chapter:
OR
[3]29. (B)

If cot θ + cos θ = p and cot θ − cos θ = q, prove that `p^2 - q^2 = 4sqrt(pq)`.

Concept: undefined - undefined
Chapter:
[3]30

α and β are zeroes of a quadratic polynomial px2 + qx + 1. Form a quadratic polynomial whose zeroes are `2/α` and `2/β`.

Concept: undefined - undefined
Chapter:
[3]31

Rectangle ABCD circumscribes the circle of radius 10 cm. Prove that ABCD is a square. Hence, find the perimeter of ABCD.

Concept: undefined - undefined
Chapter:
SECTION - D : (This section has 4 long answer questions of 5 marks each.)
[5]32. (A)

The sides of a right triangle are such that the longest side is 4 m more than the shortest side and the third side is 2 m less than the longest side. Find the length of each side of the triangle. Also, find the difference between the numerical values of the area and the perimeter of the given triangle.

Concept: undefined - undefined
Chapter:
OR
[5]32. (B)

Express the equation `(x - 2)/(x - 3) + (x - 4)/(x - 5) = 10/3`; (x ≠ 3, 5) as a quadratic equation in standard form. Hence, find the roots of the equation so formed.

Concept: undefined - undefined
Chapter:
[5]33. (A)

The corresponding sides of ΔABC and ΔPQR are in the ratio 3 : 5. AD ⊥ BC and PS ⊥ QR, as shown in the following figures:

  1. Prove that ΔADC ~ ΔPSR.
  2. If AD = 4 cm, find the length of PS.
  3. Using (ii) find ar(ΔABC) : ar(ΔPQR).
Concept: undefined - undefined
Chapter:
OR
[5]33. (B)

State the basic proportionality theorem. Use it to prove the following:

If three parallel lines l, m, n are intersected by transversals q and s as shown in the adjoining figure, then `(AB)/(BC) = (DE)/(EF)`.

Concept: undefined - undefined
Chapter:
[5]34

A wooden cubical die is formed by forming hemispherical depressions on each face of the cube such that face 1 has one depression, face 2 has two depressions, and so on. The sum of the number of hemispherical depressions on opposite faces is always 7. If the edge of the cubical die measures 5 cm and each hemispherical depression is of diameter 1.4 cm, find the total surface area of the die so formed.

Concept: undefined - undefined
Chapter:
[5]35

The following table shows the number of patients of different age groups who were discharged from the hospital in a particular month:

Age (in years) Number of Patients Discharged
5 − 15 6
15 − 25 11
25 − 35 21
35 − 45 23
45 − 55 14
55 − 65 5
Total 80

Find the ‘mean’ and the ‘mode’ of the above data.

Concept: undefined - undefined
Chapter:
SECTION - E : (This section has 3 case study based questions of 4 marks each.)
[4]36

The Olympic symbol, comprising five interlocking rings, represents the union of the five continents of the world and the meeting of athletes from all over the world at the Olympic Games. In order to spread awareness about the Olympic Games, students of Class X took part in various activities organised by the school. One such group of students made 5 circular rings in the school lawn with the help of ropes. Each circular ring required 44 m of rope.

Also, in the shaded regions, as shown in the figure, students made rangoli showcasing various sports and games. It is given that ΔOAВ is an equilateral triangle, and all unshaded regions are congruent.

Based on the above information, answer the following questions:

  1. Find the radius of each circular ring. (1)
  2. What is the measure of ∠AOB? (1)
    1. Find the area of the shaded region R1. (2)
      OR
    2. Find the length of rope around the unshaded regions. (2)
Concept: undefined - undefined
Chapter:
[4]37

Cable cars at hill stations are one of the major tourist attractions. On a hill station, the length of the cable car ride from the base point to the top-most point on the hill is 5000 m. Poles are installed at equal intervals on the way to provide support to the cables on which the car moves.

The distance of the first pole from the base point is 200 m and subsequent poles are installed at an equal interval of 150 m. Further, the distance of the last pole from the top is 300 m.

Based on the above information, answer the following questions using arithmetic progression:

  1. Find the distance of the 10th pole from the base. (1)
  2. Find the distance between the 15th pole and the 25th pole. (1)
    1. Find the time taken by the cable car to reach the 15th pole from the top if it is moving at the speed of 5 m/sec and coming from the top. (2)
      OR
    2. Find the total number of poles installed along the entire journey. (2)
Concept: undefined - undefined
Chapter:
[4]38

A drone was used to facilitate the movement of an ambulance on a straight highway to a point P on the ground where there was an accident.

The ambulance was travelling at a speed of 60 km/h. The drone stopped at a point Q, 100 m vertically above the point P. The angle of depression of the ambulance was found to be 30° at a particular instant.

Based on the above information, answer the following questions:

  1. Represent the above situation with the help of a diagram. (1)
  2. Find the distance between the ambulance and the site of the accident (P) at the particular instant. (Use `sqrt3` = 1.73) (1)
    1. Find the time (in seconds) in which the angle of depression changes from 30° to 45°. (2)
      OR
    2. How long (in seconds) will the ambulance take to reach point P from a point T on the highway, such that the angle of depression of the ambulance at T is 60° from the drone? (2)
Concept: undefined - undefined
Chapter:

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