CBSE Class 10 Maths Standard 2020 Question Paper

This question paper comprises four sections - A, B, C and D. This question paper carries 40 questions. All questions are compulsory. Section A from Question no. 1 to 20 comprises of 20 questions of one mark each.

Section B from Question no. 21 to 26 comprises of 6 questions of two marks each. Section C from Question no. 27 to 34 comprises of 8 questions of three marks each. Section D from Question no. 35 to 40 comprises of 6 questions of four marks each.

Section - A

Question numbers 1 to 10 are multiple choice questions of 1 mark each. Select the correct option.

1. The sum of exponents of prime factors in the prime-factorisation of 196 is

  1. 3
  2. 4
  3. 5
  4. 2

2. Euclid’s division Lemma states that for two positive integers a and b, there exists unique integer q and r satisfying a = bq + r, and

  1. 0 < r < b
  2. 0 < r ≤ b
  3. 0 ≤ r < b
  4. 0 ≤ r ≤ b

3. The zeroes of the polynomial x2 – 3x – m(m + 3) are

  1. m, m + 3
  2. –m, m + 3
  3. m, –(m + 3)
  4. –m, –(m + 3)

4. The value of k for which the system of linear equations x + 2y = 3, 5x + ky + 7 = 0 is inconsistent is

  1. –14/3
  2. 2/5
  3. 5
  4. 10

5. The roots of the quadratic equation x2 – 0.04 = 0 are

  1. ± 0.2
  2. ± 0.02
  3. 0.4
  4. 2

6. The common difference of the A.P.  is

  1. 1
  2. 1/p
  3. –1
  4. –1/p

7. The nth term of the A.P. a, 3a, 5a, …… is

  1. na
  2. (2n – 1)a
  3. (2n + 1)a
  4. 2na

8. The point P on x-axis equidistant from the points A(–1, 0) and B(5, 0) is

  1. (2, 0)
  2. (0, 2)
  3. (3, 0)
  4. (2, 2)

9. The co-ordinates of the point which is reflection of point (–3, 5) in x-axis are

  1. (3, 5)
  2. (3, –5)
  3. (–3, –5)
  4. (–3, 5)

10. If the point P (6, 2) divides the line segment joining A(6, 5) and B(4, y) in the ratio 3 : 1, then the value of y is

  1. 4
  2. 3
  3. 2
  4. 1

In Q. Nos. 11 to 15, fill in the blanks. Each question is of 1 mark.

11. In figure, MN || BC and AM : MB = 1 : 2, then ar(Δ AMN)/ar(Δ ABC) = _________.

12. In given Figure, the length PB = _________ cm.

13. In ΔABC, AB = 6√3 cm, AC = 12 cm and BC = 6 cm, then ∠B = _________.

OR

Two triangles are similar if their corresponding sides are _________.

14. The value of (tan 1º tan 2º …… tan 89º) is equal to _________.

15. In figure, the angles of depressions from the observing positions O1 and O2 respectively of the object A are _________, _________.

Q. Nos. 16 to 20 are short answer type questions of 1 mark each.

16. If sin A + sin2 A = 1, then find the value of the expression (cos2 A + cos4 A).

17. In figure is a sector of circle of radius 10.5 cm. Find the perimeter of the sector. (Take π = 22/7)

18. If a number x is chosen at random from the numbers –3, –2, –1, 0, 1, 2, 3, then find the probability of x2 < 4.

OR

What is the probability that a randomly taken leap year has 52 Sundays ?

19. Find the class-marks of the classes 10-25 and 35-55.

20. A die is thrown once. What is the probability of getting a prime number.

Section - B

21. A teacher asked 10 of his students to write a polynomial in one variable on a paper and then to handover the paper. The following were the answers given by the students :

Answer the following questions :

  1. How many of the above ten, are not polynomials ?
  2. How many of the above ten, are quadratic polynomials ?

22. In figure, ABC and DBC are two triangles on the same base BC. If AD intersects BC at O, show that

ar (Δ ABC)/ar(Δ DBC) = AO/DO

OR

In figure, if AD ⊥ BC, then prove that AB2 + CD2 = BD2 + AC2.

23. Prove that 

OR

Show that tan4 θ + tan2 θ = sec4 θ – sec2 θ

24. The volume of a right circular cylinder with its height equal to the radius is 25 1/7 cm3. Find the height of the cylinder. (Use π = 22/7)

25. A child has a die whose six faces show the letters as shown below :
A B C D E A

The die is thrown once. What is the probability of getting (i) A, (ii) D ?

26. Compute the mode for the following frequency distribution :

Section - C

27. If 2x + y = 23 and 4x – y = 19, find the value of (5y – 2x) and (y/x - 2).

OR

Solve for x : 

28. Show that the sum of all terms of an A.P. whose first term is a, the second term is b and the last term is c is equal to (a + c)(b + c – 2a)/2(b – a)

OR

Solve the equation :

1 + 4 + 7 + 10 + … + x = 287.

29. In a flight of 600 km, an aircraft was slowed down due to bad weather. The average speed of the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. Find the duration of flight.

30. If the mid-point of the line segment joining the points A(3, 4) and B(k, 6) is P (x, y) and x + y – 10 = 0, find the value of k.

OR

Find the area of triangle ABC with A (1, –4) and the mid-points of sides through A being (2, –1) and (0, –1).

31. In Figure, if Δ ABC ~ Δ DEF and their sides of lengths (in cm) are marked along them, then find the lengths of sides of each triangle.

32. If a circle touches the side BC of a triangle ABC at P and extended sides AB and AC at Q and R, respectively, prove that

AQ = 1/2 (BC + CA + AB)

33. If sin θ + cos θ = √2, prove that tan θ + cot θ = 2.

34. The area of a circular play ground is 22176 cm2. Find the cost of fencing this ground at the rate of Rs. 50 per metre.

Section - D

35. Prove that √5 is an irrational number.

36. It can take 12 hours to fill a swimming pool using two pipes. If the pipe of larger diameter is used for four hours and the pipe of smaller diameter for 9 hours, only half of the pool can be filled. How long would it take for each pipe to fill the pool separately ?

37. Draw a circle of radius 2 cm with centre O and take a point P outside the circle such that OP = 6.5 cm. From P, draw two tangents to the circle.

OR

Construct a triangle with sides 5 cm, 6 cm and 7 cm and then construct another triangle whose sides are 3/4 times the corresponding sides of the first triangle.

38. From a point on the ground, the angles of elevation of the bottom and the top of a tower fixed at the top of a 20 m high building are 45° and 60° respectively. Find the height of the tower.

39. Find the area of the shaded region in figure, if PQ = 24 cm, PR = 7 cm and O is the centre of the circle.

OR

Find the curved surface area of the frustum of a cone, the diameters of whose circular ends are 20 m and 6 m and its height is 24 m.

40. The mean of the following frequency distribution is 18. The frequency f in the class interval 19 - 21 is missing. Determine f.

OR

The following table gives production yield per hectare of wheat of 100 farms of a village :

Change the distribution to a ‘more than’ type distribution and draw its ogive.