Mathematics Standard - Delhi Set 2 2022-2023 English Medium Class 10 Question Paper Solution

Which of the following is true for all values of θ (0° ≤ θ ≤ 90°)?

cos² θ – sin² θ = 1

cosec² θ – sec² θ = 1

sec² θ – tan² θ = 1

cot² θ – tan² θ = 1

If k + 2, 4k – 6 and 3k – 2 are three consecutive terms of an A.P., then the value of k is ______.

3

–3

4

–4

The next term of the A.P. : `sqrt(6), sqrt(24), sqrt(54)` is ______.

`sqrt(60)`

`sqrt(96)`

`sqrt(72)`

`sqrt(216)`

The distance of the point (–1, 7) from x-axis is ______.

–1

7

6

`sqrt(50)`

What is the area of a semi-circle of diameter ‘d’?

`1/16 πd^2`

`1/4 πd^2`

`1/8 πd^2`

`1/2 πd^2`

The empirical relation between the mode, median and mean of a distribution is ______.

Mode = 3 Median – 2 Mean

Mode = 3 Mean – 2 Median

Mode = 2 Median – 3 Mean

Mode = 2 Mean – 3 Median

The pair of linear equations 2x = 5y + 6 and 15y = 6x – 18 represents two lines which are ______.

intersecting

parallel

coincident

either intersecting or parallel

If α and β are the zeroes of the polynomial x² – 1, then the value of (α + β) is ______.

2

1

–1

0

A pole 6 m high casts a shadow `2sqrt(3)` m long on the ground, then the Sun’s elevation is ______.

60°

45°

30°

90°

sec θ when expressed in term of cot θ, is equal to ______.

`(1 + cot^2 θ)/cotθ`

`sqrt(1 + cot^2 θ)`

`sqrt(1 + cot^2 θ)/cotθ`

`sqrt(1 - cot^2 θ)/cotθ`

For the following distribution:

The sum of lower limits of the median class and modal class is:

15

25

30

35

The length of tangent drawn to a circle of radius 9 cm from a point 41 cm from the centre is ______.

40 cm

9 cm

41 cm

50 cm

In figure, if O is the centre of a circle PQ is a chord and the tangent PR at P makes an angle of 50° with PQ, then ∠POQ is equal to ______.

100°

80°

90°

75°

A bag contains 5 red balls and n green balls. If the probability of drawing a green ball is three times that of a red ball, then the value of n is ______.

18

15

10

20

In figure, AT is a tangent to the circle with centre O such that OT = 4 cm and ∠OTA = 30°. Then AT is equal to ______.

4 cm

2 cm

`2sqrt3` cm

`4sqrt3` cm

In ΔABC, PQ || BC. If PB = 6 cm, AP = 4 cm, AQ = 8 cm, find the length of AC.

12 cm

20 cm

6 cm

14 cm

If α, β are the zeroes of the polynomial p(x) = 4x² – 3x – 7, then `(1/α + 1/β)` is equal to ______.

`7/3`

`(-7)/3`

`3/7`

`(-3)/7`

A card is drawn at random from a well-shuffled pack of 52 cards. The probability that the card drawn is not an ace is ______.

`1/13`

`9/13`

`4/13`

`12/13`

Assertion (A): The probability that a leap year has 53 Sundays is `2/7`.

Reason (R): The probability that a non-leap year has 53 Sundays is `5/7`.

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 and 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.

Assertion (A): a, b, c are in A.P. if and only if 2b = a + c.

Reason (R): The sum of first n odd natural numbers is n².

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 and 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.

Evaluate: `5/(cot^2 30^circ) + 1/(sin^2 60^circ) - cot^2 45^circ + 2 sin^2 90^circ`.

If θ is an acute angle and sin θ = cos θ, find the value of tan² θ + cot² θ – 2.

If one zero of the polynomial p(x) = 6x² + 37x – (k – 2) is reciprocal of the other, then find the value of k.

Find the sum and product of the roots of the quadratic equation 2x² – 9x + 4 = 0.

Find the discriminant of the quadratic equation 4x² – 5 = 0 and hence comment on the nature of roots of the equation.

If a fair coin is tossed twice, find the probability of getting 'almost one head'.

Evaluate:

`(5 cos^2 60^circ + 4 sec^2 30^circ - tan^2 45^circ)/(sin^2 30^circ + cos^2 30^circ)`

If A and B are acute angles such that sin (A – B) = 0 and 2 cos (A + B) – 1 = 0, then find angles A and B.

How many terms are there in an A.P. whose first and fifth terms are – 14 and 2, respectively and the last term is 62?

Which term of the A.P. : 65, 61, 57, 53, .............. is the first negative term?

Prove that `sqrt(5)` is an irrational number. 

Prove that the angle between the two tangents drawn from an external point to a circle is supplementary to the angle subtended by the line segments joining the points of contact to the centre.

The sum of first 15 terms of an A.P. is 750 and its first term is 15. Find its 20^th term.

Rohan repays his total loan of ₹ 1,18,000 by paying every month starting with the first installment of ₹ 1,000. If he increases the installment by ₹ 100 every month, what amount will be paid by him in the 30^th installment? What amount of loan has he paid after 30^th installment?

Prove that `sqrt3` is an irrational number.

Find the value of 'p' for which the quadratic equation px(x – 2) + 6 = 0 has two equal real roots.

From a soild cylinder of height 20 cm and diameter 12 cm, a conical cavity of height 8 cm and radius 6 cm is hallowed out. Find the total surface area of the remaining solid.

D is a point on the side BC of ∆ABC such that ∠ADC = ∠BAC. Prove that` \frac{"CA"}{"CD"}=\frac{"CB"}{"CA"} or "CA"^2 = "CB" × "CD".`

If AD and PM are medians of triangles ABC and PQR, respectively where ΔABC ~ ΔPQR, prove that `("AB")/("PQ") = ("AD")/("PM")`.

A student was asked to make a model shaped like a cylinder with two cones attached to its ends by using a thin aluminium sheet. The diameter of the model is 3 cm and its total length is 12 cm. If each cone has a height of 2 cm, find the volume of air contained in the model.

In the given figure, ∠ADC = ∠BCA; prove that ΔACB ∼ ΔADC. Hence find BD if AC = 8 cm and AD = 3 cm.

Prove that, if a line is drawn parallel to one side of a triangle to intersect the other two sides, then the two sides are divided in the same ratio.

Read the following passage:

Two schools 'P' and 'Q' decided to award prizes to their students for two games of Hockey ₹ x per student and Cricket ₹ y per student. School 'P' decided to award a total of ₹ 9,500 for the two games to 5 and 4 Students respectively; while school 'Q' decided to award ₹ 7,370 for the two games to 4 and 3 students respectively.

Based on the above information, answer the following questions:

1. Represent the following information algebraically (in terms of x and y).
2. (a) What is the prize amount for hockey?
   OR
   (b) Prize amount on which game is more and by how much?
3. What will be the total prize amount if there are 2 students each from two games?

Read the following passage:

Jagdish has a field which is in the shape of a right angled triangle AQC. He wants to leave a space in the form of a square PQRS inside the field for growing wheat and the remaining for growing vegetables (as shown in the figure). In the field, there is a pole marked as O.

Based on the above information, answer the following questions :

1. Taking O as origin, coordinates of P are (–200, 0) and of Q are (200, 0). PQRS being a square, what are the coordinates of R and S?
2. (a) What is the area of square PQRS?
   OR
   (b) What is the length of diagonal PR in square PQRS?
3. If S divides CA in the ratio K : 1, what is the value of K, where point A is (200, 800)?

Read the following passage:

Governing council of a local public development authority of Dehradun decided to build an adventurous playground on the top of a hill, which will have adequate space for parking. After survey, it was decided to build rectangular playground, with a semi-circular area allotted for parking at one end of the playground. The length and breadth of the rectangular playground are 14 units and 7 units, respectively. There are two quadrants of radius 2 units on one side for special seats.

Based on the above information, answer the following questions:

1. What is the total perimeter of the parking area?
2. (a) What is the total area of parking and the two quadrants?
   OR
   (b) What is the ratio of area of playground to the area of parking area? 
3. Find the cost of fencing the playground and parking area at the rate of ₹ 2 per unit.