Date: March 2015

A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is consonant.

Chapter: [5.01] Probability [5.01] Probability

In Fig. 1, PA and PB are tangents to the circle with centre O such that ∠APB = 50°. Write the measure of ∠OAB.

Chapter: [3.01] Circles [3.01] Circles

The tops of two towers of height *x *and *y,* standing on level ground, subtend angles of 30° and 60° respectively at the centre of the line joining their feet, then find *x*, *y*.

Chapter: [4.01] Heights and Distances

If x=−`1/2`, is a solution of the quadratic equation 3x^{2}+2kx−3=0, find the value of k

Chapter: [2.03] Quadratic Equations

If A(5, 2), B(2, −2) and C(−2, *t*) are the vertices of a right angled triangle with ∠B = 90°, then find the value of *t*.

Chapter: [6.01] Lines (In Two-dimensions)

From a point T outside a circle of centre O, tangents TP and TQ are drawn to the circle. Prove that OT is the right bisector of line segment PQ.

Chapter: [3.01] Circles [3.01] Circles

In Fig. 2, AB is the diameter of a circle with centre O and AT is a tangent. If ∠AOQ = 58°, find ∠ATQ.

Chapter: [3.01] Circles [3.01] Circles

Solve the following quadratic equation for *x* : 4x^{2} − 4a^{2}x + (a^{4} − b^{4}) =0.

Chapter: [2.03] Quadratic Equations

Find the ratio in which the point `P(3/4,5/12)` divides the line segment joining the points `A(1/2,3/2)` and B(2,-5)

Chapter: [6.01] Lines (In Two-dimensions)

Find the middle term of the A.P. 213, 205, 197, ---, 37.

Chapter: [2.02] Arithmetic Progressions

In Fig. 3, APB and AQO are semicircles, and AO = OB. If the perimeter of the figure is 40 cm, find the area of the shaded region [Use `pi=22/7`]

Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles

A solid wooden toy is in the form of a hemisphere surrounded by a cone of same radius. The radius of hemisphere is 3.5 cm and the total wood used in the making of toy is 166 `5/6` cm^{3}. Find the height of the toy. Also, find the cost of painting the hemispherical part of the toy at the rate of Rs 10 per cm^{2 .}[Use`pi=22/7`]

Chapter: [7.02] Surface Areas and Volumes

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

Chapter: [6.01] Lines (In Two-dimensions)

In Fig. 4, from the top of a solid cone of height 12 cm and base radius 6 cm, a cone of height 4 cm is removed by a plane parallel to the base. Find the total surface area of the remaining solid. (Use `pi=22/7` and `sqrt5=2.236`)

Chapter: [7.02] Surface Areas and Volumes

In Fig. 5, from a cuboidal solid metallic block, of dimensions 15cm ✕ 10cm ✕ 5cm, a cylindrical hole of diameter 7 cm is drilled out. Find the surface area of the remaining block [Use

`pi=22/7`]

Chapter: [7.02] Surface Areas and Volumes

In Figure, find the area of the shaded region [Use π = 3.14]

Chapter: [7.01] Areas Related to Circles [7.01] Areas Related to Circles

The angle of elevation of the top of a building from the foot of the tower is 30° and the angle of elevation of the top of the tower from the foot of the building is 45°. If the tower is 30 m high, find the height of the building.

Chapter: [4.01] Heights and Distances

If the sum of the first n terms of an A.P. is `1/2`(3n^{2} +7n), then find its n^{th} term. Hence write its 20^{th} term.

Chapter: [2.02] Arithmetic Progressions

Three distinct coins are tossed together. Find the probability of getting

(i) at least 2 heads

(ii) at most 2 heads

Chapter: [5.01] Probability [5.01] Probability

Find that value of *p* for which the quadratic equation (*p* + 1)*x*^{2} − 6(*p* + 1)*x* + 3(*p* + 9) = 0, *p* ≠ − 1 has equal roots. Hence find the roots of the equation.

Chapter: [2.03] Quadratic Equations

In Fig. 7, tangents PQ and PR are drawn from an external point P to a circle with centre O, such that ∠RPQ = 30°. A chord RS is drawn parallel to the tangent PQ. Find ∠RQS.

Chapter: [3.01] Circles [3.01] Circles

From a point P on the ground the angle of elevation of the top of a tower is 30° and that of the top of a flag staff fixed on the top of the tower, is 60°. If the length of the flag staff is 5 m, find the height of the tower.

Chapter: [4.01] Heights and Distances

Ramkali required Rs 2,500 after 12 weeks to send her daughter to school. She saved Rs 100 in the first week and increased her weekly saving by Rs 20 every week. Find whether she will be able to send her daughter to school after 12 weeks.

What value is generated in the above situation?

Chapter: [2.02] Arithmetic Progressions

A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is divisible by 2 or 3.

Chapter: [5.01] Probability [5.01] Probability

A box contains 20 cards numbered from 1 to 20. A card is drawn at random from the box. Find the probability that the number on the drawn card is a prime number.

Chapter: [5.01] Probability [5.01] Probability

Water is flowing at the rate of 2.52 km/h through a cylindrical pipe into a cylindrical tank, the radius of whose base is 40 cm. If the increase in the level of water in the tank, in half an hour is 3.15 m, find the internal diameter of the pipe.

Chapter: [7.02] Surface Areas and Volumes [7.02] Surface Areas and Volumes

A well of diameter 4 m is dug 14 m deep. The earth taken out is spread evenly all around the well to form a 40 cm high embankment. Find the width of the embankment.

Chapter: [7.02] Surface Areas and Volumes [7.02] Surface Areas and Volumes

Solve for *x* :

`2/(x+1)+3/(2(x-2))=23/(5x), x!=0,-1,2`

Chapter: [2.03] Quadratic Equations

To fill a swimming pool two pipes are to be used. If the pipe of larger diameter is used for 4 hours and the pipe of smaller diameter for 9 hours, only half the pool can be filled. Find, how long it would take for each pipe to fill the pool separately, if the pipe of smaller diameter takes 10 hours more than the pipe of larger diameter to fill the pool.

Chapter: [7.02] Surface Areas and Volumes [7.02] Surface Areas and Volumes

Prove that the lengths of the tangents drawn from an external point to a circle are equal.

Chapter: [3.01] Circles

Construct an isosceles triangle whose base is 6 cm and altitude 4 cm. Then construct another triangle whose sides are `3/4`times the corresponding sides of the isosceles triangle.

Chapter: [3.03] Constructions

If P(–5, –3), Q(–4, –6), R(2, –3) and S(1, 2) are the vertices of a quadrilateral PQRS, find its area.

Chapter: [6.01] Lines (In Two-dimensions)

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