10th Maths Paper Solutions Set 2 : CBSE Delhi Previous Year 2011

General instructions:
1. All questions are compulsory.
2. The question paper consists of 34 questions divided into four sections A, B, C and
D.
3. Section A contains 10 questions of 1 mark each, which are multiple choices type
questions, Section B contains 8 questions of 2 marks each, Section C contains 10 questions of 3 marks each, Section D contains 6 questions of 4 marks each.
4. There is no overall choice in the paper. However, internal choice is provided in one
question of 2 marks, 3 questions of 3 marks each and two questions of 4 marks each.
5. Use of calculators is not permitted.
Q1 :

The point P which divides the line segment joining the points A (2, −5) and B (5, 2) in the ratio 2:3 lies in the quadrant.

A. I

B. II

C. III

D. IV


Answer :

The point P divides the line segment joining the points A (2, −5) and B (5, 2) in the ratio 2: 3.

The point lies in quadrant IV.

The correct answer is D.

Q2 :

A sphere of diameter 18 cm is dropped into a cylindrical vessel of diameter 36 cm, partly filled with water. If the sphere is completely submerged, then the water level rises (in cm) by

A. 3

B. 4

C. 5

D. 6


Answer :

Radius of the sphere

Radius of the cylinder

Let us assume that the water level in the cylinder rises by h cm.

After the sphere is completely submerged,

Volume of the sphere = Volume of liquid raised in the cylinder

Thus, the water level in the cylinder rises by 3 cm.

The correct answer is A.

Q3 :

In figure 1, O is the centre of a circle, AB is a chord and AT is the tangent at A. If AOB = 100°, then BAT is equal to

A. 100°

B. 40°

C. 50°

D. 90°


Answer :

It is given that AOB=100°

ΔAOB is isosceles because

OA = OB = radius

∴ ∠OAB = OBA

∠AOB + OAB + OBA = 180° [Angle sum property of triangle]

⇒ 100° + OAB + OAB = 180°

⇒ 2OAB = 80°

⇒ ∠OAB = 40°

Now, OAT = 90° [AT is tangent and OA is radius]

Thus, BAT = OAT − OAB = 90° − 40° = 50°

The correct answer is C.

Q4 :

The roots of the equation x2 + xp (p + 1) = 0, where p is a constant, are

A. p, p + 1

B.p, p + 1

C. p, − (p + 1)

D.p, − (p + 1)


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Q5 :

Which of the following can not be the probability of an event?

A. 1.5

B.

C. 25%

D. 0.3


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Q6 :

The mid-point of segment AB is the point P (0, 4). If the coordinates of B are (−2, 3) then the coordinates of A are

A. (2, 5)

B. (−2, −5)

C. (2, 9)

D. (−2, 11)


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Q7 :

In figure 2, PA and PB are tangents to the circle with centre O. If APB = 60°, then OAB is

A. 30°

B. 60°

C. 90°

D. 15°


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Q8 :

The angle of elevation of the top of a tower from a point on the ground, which is 30 m away from the foot of the tower is 45°. The height of the tower (in metres) is

A. 15

B. 30

C.

D.


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Q9 :

In an AP, if a = − 10, n = 6 and an = 10, then the value of d is

A. 0

B. 4

C. −4

D.


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Q10 :

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

A. 2 units

B. π units

C. 4 units

D. 7 units


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Q11 :

In figure 3, APB and CQD are semi-circles of diameter 7 cm each, while ARC and BSD are semi-circles of diameter 14 cm each. Find the perimeter of the shaded region.

OR

Find the area of a quadrant of a circle, where the circumference of circle is 44 cm.


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Q12 :

Two concentric circles are of radii 7 cm and r cm respectively, where r > 7. A chord of the larger circle, of length 48 cm, touches the smaller circle. Find the value of r.


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Q13 :

Find the values(s) of x for which the distance between the points P(x, 4) and Q(9, 10) is 10 units.


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Q14 :

Find whether − 150 is a term of the AP 17, 12, 7, 2,…?


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Q15 :

Two cubes, each of side 4 cm are joined end to end. Find the surface area of the resulting cuboid.


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Q16 :

Draw a line segment of length 6 cm. Using compasses and ruler, find a point P on it which divides it in the ratio 3:4.


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Q17 :

Find the value of k so that the quadratic equation kx (3x − 10) + 25 = 0, has two equal roots.


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Q18 :

A coin is tossed two times. Find the probability of getting not more than one head.


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Q19 :

In fig. 4, a triangle ABC is drawn to circumscribe a circle of radius 2 cm such that the segments BD and DC into which BC is divided by the point of contact D are of lengths 4 cm and 3 cm respectively. If area of ΔABC = 21 cm2, then find the lengths of sides AB and AC.


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Q20 :

Two dice are rolled once. Find the probability of getting such numbers on two dice, whose product is a perfect square.

OR

A game consists of tossing a coin 3 times and noting its outcome each time. Hanif wins if he gets three heads or three tails, and loses otherwise. Calculate the probability that Hanif will lose the game.


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Q21 :

If two vertices of an equilateral triangle are (3, 0) and (6, 0), find the third vertex.

OR

Find the value of k, if the points P(5, 4), Q(7, k) and R (9, −2) are collinear.


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Q22 :

Find the roots of the following quadratic equation:


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Q23 :

Find the value of the middle term of the following AP:

−6, −2, 2, ……, 58.

OR

Determine the AP whose fourth term is 18 and the differences of the ninth term from the fifteenth term is 30.


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Q24 :

Find the area of the major segment APB, in Fig 5, of a circle of radius 35 cm and AOB = 90°.


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Q25 :

From the top of a tower 100 m high, a man observes two cars on the opposite sides of the tower with angles of depression 30° and 45° respectively. Find the distance between the cars.


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Q26 :

The radii of the circular ends of a bucket of height 15 cm are 14 cm and r cm (r < 14 cm). If the volume of bucket is 5390 cm3, then find the value of r.


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Q27 :

Draw a triangle ABC with side BC = 7 cm, B = 45° and A = 105°. Then construct a triangle whose sides are times the corresponding sides of ΔABC.


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Q28 :

If P(2, 4) is equidistant from Q(7, 0) and R(x, 9), find the values of x. Also find the distance PQ.


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Q29 :

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


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Q30 :

A motor boat whose speed is 20 km/h in still water, takes 1 hour more to go 48 km upstream than to return downstream to the same spot. Find the speed of the stream.

OR

Find the roots of the equation


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Q31 :

If the sum of first 4 terms of an AP is 40 and that of first 14 terms is 280, find the sum of its first n terms.

OR

Find the sum of the first 30 positive integers divisible by 6.


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Q32 :

From a point on the ground, the angles of elevation of the bottom and top of a transmission tower fixed at the top of a 10 m high building are 30° and 60° respectively. Find the height of the tower.


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Q33 :

Find the area of the shaded region in Fig. 6, where arcs drawn with centres A, B, C and D intersect in pairs at mid-points P, Q, R and S of the sides AB, BC, CD and DA respectively of a square ABCD, where the length of each side of square is 14 cm.


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Q34 :

A toy is in the shape of a solid cylinder surmounted by a conical top. If the height and diameter of the cylindrical part are 21 cm and 40 cm respectively, and the height of cone is 15 cm, then find the total surface area of the toy. [π = 3.14, be taken]


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10th Maths Paper Solutions Set 3 : CBSE Delhi Previous Year 2013 will be available online in PDF book soon. The solutions are absolutely Free. Soon you will be able to download the solutions.