CBSE X
All India (2)
MATHS PAPER 2012
Time allowed: 180 minutes; Maximum Marks: 90
General Instructions: | |
1) | All questions are compulsory. |
2) | The question paper consists of thirty questions divided into 4 sections A, B, C and D. Section A comprises of ten questions of 01 mark each, Section B comprises of five questions of 02 marks each, Section C comprises ten questions of 03 marks each and Section D comprises of five questions of 06 marks each. |
3) | All questions in Section A are to be answered in one word, one sentence or as per the exact requirement of the question. |
4) | There is no overall choice. However, internal choice has been provided in one question of 02 marks each, three questions of 03 marks each and two questions of 06 marks each. You have to attempt only one of the alternatives in all such questions. |
5) | In question on construction, drawing should be near and exactly as per the given measurements. |
6) | Use of calculators is not permitted. |
1. If 1 is a root of the equations a${y}^{2}$ + ay + 3 = 0 and${y}^{2}$+ y + b = 0 then ab equals:
2. The sum of first 20 odd natural numbers is:
3. In Fig. 1, the sides AB, BC and CA of a triangle ABC, touch a circle at P, Q and R respectively. If PA = 4 cm, BP = 3 cm and AC = 11 cm, then the length of BC (in cm) is:
4. In Fig 2, a circle touches the side DF of Î”EDF at H and touches ED and EF produced at K and M respectively. If EK = 9 cm, then the perimeter of Î”EDF (in cm) is:
5. If the radius of the base of a right circular cylinder is halved, keeping the height the same, then the ratio of the volume of the cylinder thus obtained to the volume of original cylinder is:
6. If the area of a circle is equal to sum of the areas of two circles of diameters 10 cm and 24 cm, then the diameter of the larger circle (in cm) is:
7. The length of shadow of a tower on the plane ground is $\sqrt{3}$times the height of the tower. The angle of elevation of sun is:
8. If the coordinates of one end of a diameter of a circle are (2, 3) and the coordinates of its centre are (âˆ’2, 5), then the coordinates of the other end of the diameter are:
9. The coordinates of the point P dividing the line segment joining the points A (1, 3) and B (4, 6) in the ratio 2 : 1 are:
10. Two dice are thrown together. The probability of getting the same number on both dice is:
11. Find the value(s) of k so that the quadratic equation ${x}^{2}$âˆ’4kx + k = 0 has equal roots.
12. Find the sum of all three digit natural numbers, which are multiples of 11.
13. Tangents PA and PB are drawn from an external point P to two concentric circles with centre O and radii 8 cm and 5 cm respectively, as shown in Fig. 3. If AP = 15 cm, then find the length of BP.
14. In Fig. 4, an isosceles triangle ABC, with AB = AC, circumscribes a circle. Prove that the point of contact P bisects the base BC.
OR
In Fig. 5, the chord AB of the larger of the two concentric circles, with centre O, touches the smaller circle at C. Prove that AC = CB.
15. The volume of a hemisphere is 2425$\frac{1}{2}{\mathrm{cm}}^{3}$. Find its curved surface area. [ Use Ï€ = $\frac{22}{7}$]
16. In Fig. 6, OABC is a square of side 7 cm. If OAPC is a quadrant of a circle with centre O, then find the area of the shaded region. [ Use Ï€ = $\frac{22}{7}$]
17. If a point A (0, 2) is equidistant from the points B (3, p) and C (p, 5), then find the value of p.
18. A number is selected at random from first 50 natural numbers. Find the probability that it is a multiple of 3 and 4.
19. Solve for x: 4${x}^{2}$ âˆ’ 4ax + (${a}^{2}$âˆ’${b}^{2}$) = 0
OR
Solve for x: 3${x}^{2}$- 2$\sqrt{6}$x + 2 = 0
20. Prove that the parallelogram circumscribing a circle is a rhombus.
OR
Prove that opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the centre of the circle.
21. Construct a right triangle in which the sides, (other than the hypotenuse) are of length 6 cm and 8 cm. Then construct another triangle, whose sides are $\frac{3}{5}$ times the corresponding sides of the given triangle.
22. In Fig. 7, PQ and AB are respectively the arcs of two concentric circles of radii 7 cm and 3.5 cm and centre O. If âˆ POQ = 30Â°, then find the area of the shaded region. [ Use Ï€ = $\frac{22}{7}$]
23. From a solid cylinder of height 7 cm and base diameter 12 cm, a conical cavity of same height and same base diameter is hollowed out. Find the total surface area of the remaining solid. [ Ï€ = $\frac{22}{7}$]
OR
A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, then find the radius and slant height of the heap.
24. The angles of depression of two ships from the top of a light house and on the same side of it are found to be 45Â° and 30Â°. If the ships are 200 m apart, find the height of the light house
25. A point P divides the line segment joining the points A (3, âˆ’5) and B (âˆ’4, 8) such that $\frac{\mathrm{AP}}{\mathrm{PB}}$= $\frac{k}{1}$. If P lies on the line x + y = 0, then find the value of k.
26. If the vertices of a triangle are (1, âˆ’3), (4, p) and (âˆ’9, 7) and its area is 15 sq. units, find the value(s) of p.
27. A box contains 100 red cards, 200 yellow cards and 50 blue cards. If a card is drawn at random from the box, then find the probability that it will be (i) a blue card (ii) not a yellow card (iii) neither yellow nor a blue card.
28. The${17}^{\mathrm{th}}$term of an A.P. is 5 more than twice its${8}^{\mathrm{th}}$term. If the ${11}^{\mathrm{th}}$term of the A.P. is 43, then find its${n}^{\mathrm{th}}$term.
29. A shopkeeper buys some books for Rs 80. If he had bought 4 more books for the same amount, each book would have cost Rs 1 less. Find the number of books he bought.
OR
The sum of two numbers is 9 and the sum of their reciprocals is $\frac{1}{2}$. Find the numbers.
30. Sum of the first 14 terms of an A.P. is 1505, and its first term is 10. Find its ${25}^{\mathrm{th}}$term.
31. Prove that the tangent at any point of a circle is perpendicular to the radius through the point of contact.
OR
A quadrilateral ABCD is drawn to circumscribe a circle. Prove that AB + CD = AD + BC.
32. A solid is in the shape of a cone surmounted on a hemisphere, the radius of each of them being 3.5 cm and the total height of solid is 9.5 cm. Find the volume of the solid. [ Use Ï€ = $\frac{22}{7}$]
33. A bucket is in the form of a frustum of a cone and it can hold 28.49 litres of water. If the radii of its circular ends are 28 cm and 21 cm, find the height of the bucket.[ Use Ï€ = $\frac{22}{7}$]
34. The angle of elevation of the top of a hill at the foot of a tower is 60Â° and the angle of depression from the top of the tower to the foot of the hill is 30Â°. If the tower is 50 m high, find the height of the hill.