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Question Paper Solutions for Mathematics Delhi Set 1 2016-2017 CBSE Class 10

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Marks: 90
[1]1

The ratio of the height of a tower and the length of its shadow on the ground is `sqrt3 : 1`. What is the angle of elevation of the sun?

Chapter: [4.03] Heights and Distances
Concept: Heights and Distances
[1]2

Volume and surface area of a solid hemisphere are numerically equal. What is the diameter of hemisphere?

Chapter: [7.02] Surface Areas and Volumes
Concept: Surface Areas and Volumes Examples and Solutions
[1]3

A number is chosen at random from the number –3, –2, –1, 0, 1, 2, 3. What will be the probability that square of this number is less then or equal to 1?

Chapter: [5.02] Probability
Concept: Simple Problems on Single Events
[1]4

If the distance between the points (4, k) and (1, 0) is 5, then what can be the possible values of k?

Chapter: [6.01] Lines (In Two-dimensions)
Concept: Distance Formula
[2]5

Find the roots of the following quadratic equations by factorisation

`sqrt2 x^2 + 7x + 5sqrt2 = 0`

Chapter: [2.03] Quadratic Equations
Concept: Solutions of Quadratic Equations by Factorization
[2]6

Find how many integers between 200 and 500 are divisible by 8.

Chapter: [2.04] Arithmetic Progressions
Concept: Sum of First n Terms of an AP
[2]7

Prove that the tangents drawn at the ends of a diameter of a circle are parallel.

Chapter: [3.02] Circles
Concept: Number of Tangents from a Point on a Circle
[2]8

Find the value of k for which the equation x2 + k(2x + k − 1) + 2 = 0 has real and equal roots.

Chapter: [2.03] Quadratic Equations
Concept: Nature of Roots
[2]9

Draw a line segment of length 8 cm and divide it internally in the ratio 4 : 5

Chapter: [3.03] Constructions
Concept: Division of a Line Segment
[2]10

In the given figure, PA and PB are tangents to the circle from an external point P. CD is another tangent touching the circle at Q. If PA = 12 cm, QC = QD = 3 cm, then find PC + PD

Chapter: [3.02] Circles
Concept: Tangent to a Circle
[3]11

If the mth term of an A.P. be `1/n` and nth term be `1/m`, then show that its (mn)th term is 1.

Chapter: [2.04] Arithmetic Progressions
Concept: Arithmetic Progression
[3]12

Find the sum of n terms of the series `(4 - 1/n) + (4 - 2/n) + (4 - 3/n)+ ......`

Chapter: [2.04] Arithmetic Progressions
Concept: nth Term of an AP
[3]13

If the equation (1 + m2) x2 + 2mcx + c2 – a2 = 0 has equal roots then show that c2 = a2 (1 + m2)

Chapter: [2.03] Quadratic Equations
Concept: Quadratic Equations
[3]14

The `3/4` th part of a conical vessel of internal radius 5 cm and height 24 cm is full of water. The water is emptied into a cylindrical vessel with internal radius 10 cm. Find the height of water in cylindrical vessel. 

Chapter: [7.02] Surface Areas and Volumes
Concept: Surface Areas and Volumes Examples and Solutions
[3]15

In the given figure, OACB is a quadrant of a circle with centre O and radius 3.5 cm. If OD = 2 cm, find the area of the shaded region.

Chapter: [7.01] Areas Related to Circles
Concept: Areas of Sector and Segment of a Circle
[3]16

Two tangents TP and TQ are drawn to a circle with centre O from an external point T. Prove that ∠PTQ = 2∠OPQ.

Chapter: [3.02] Circles
Concept: Circles Examples and Solutions
[3]17

Show that ΔABC, where A(–2, 0), B(2, 0), C(0, 2) and ΔPQR where P(–4, 0), Q(4, 0), R(0, 2) are similar triangles

Chapter: [3.01] Triangles
Concept: Similarity of Triangles
[3]18

The area of a triangle is 5 sq units. Two of its vertices are (2, 1) and (3, –2). If the third vertex is (`7/2`, y). Find the value of y

Chapter: [6.01] Lines (In Two-dimensions)
Concept: Area of a Triangle
[3]19

Two different dice are thrown together. Find the probability that the numbers obtained have a sum less than 7

Chapter: [5.02] Probability
Concept: Simple Problems on Single Events

Two different dice are thrown together. Find the probability that the numbers obtained have a product less than 16

Chapter: [5.02] Probability
Concept: Simple Problems on Single Events

In a simultaneous throw of a pair of dice, find the probability of getting a doublet of odd numbers

Chapter: [5.02] Probability
Concept: Probability - A Theoretical Approach
[3]20

A moving boat is observed from the top of a 150 m high cliff moving away from the cliff. The angle of depression of the boat changes from 60° to 45° in 2 minutes. Find the speed of the boat in m/h.

Chapter: [4.03] Heights and Distances
Concept: Heights and Distances
[4]21

Construct an isosceles triangle with base 8 cm and altitude 4 cm. Construct another triangle whose sides are `2/3` times the corresponding sides of the isosceles triangle.

Chapter: [3.03] Constructions
Concept: Division of a Line Segment
[4]22

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

Chapter: [3.02] Circles
Concept: Number of Tangents from a Point on a Circle
[4]23

The ratio of the sums of m and n terms of an A.P. is m2 : n2. Show that the ratio of the mth and nth terms is (2m – 1) : (2n – 1)

Chapter: [2.04] Arithmetic Progressions
Concept: Sum of First n Terms of an AP
[4]24

Speed of a boat in still water is 15 km/h. It goes 30 km upstream and returns back at the same point in 4 hours 30 minutes. Find the speed of the stream.

Chapter: [2.02] Pair of Linear Equations in Two Variables
Concept: Pair of Linear Equations in Two Variables
[4]25

If a≠b≠0, prove that the points (a, a2), (b, b2) (0, 0) will not be collinear.

Chapter: [6.01] Lines (In Two-dimensions)
Concept: Distance Formula
[4]26

The height of a cone is 10 cm. The cone is divided into two parts using a plane parallel to its base at the middle of its height. Find the ratio of the volumes of the two parts.

Chapter: [7.02] Surface Areas and Volumes
Concept: Volume of a Combination of Solids
[4]27

Peter throws two different dice together and finds the product of the two numbers obtained. Rina throws a die and squares the number obtained. Who has the better chance to get the number 25

Chapter: [5.02] Probability
Concept: Concept Or Properties of Probability
[4]28

A chord PQ of a circle of radius 10 cm substends an angle of 60° at the centre of circle. Find the area of major and minor segments of the circle.

Chapter: [3.02] Circles
Concept: Circles Examples and Solutions
[4]29

The angle of elevation of a cloud from a point 60 m above the surface of the water of a lake is 30° and the angle of depression of its shadow in water of lake is 60°. Find the height of the cloud from the surface of water

Chapter: [4.03] Heights and Distances
Concept: Heights and Distances
[4]30

In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the side of the square where O and O' are centres of the circles. Find the area of shaded region.

Chapter: [7.01] Areas Related to Circles
Concept: Problems Based on Areas and Perimeter Or Circumference of Circle, Sector and Segment of a Circle
[4]31

In a hospital used water is collected in a cylindrical tank of diameter 2 m and height 5 m. After recycling, this water is used to irrigate a park of hospital whose length is 25 m and breadth is 20 m. If tank is filled completely then what will be the height of standing water used for irrigating the park. Write your views on recycling of water.

Chapter: [7.02] Surface Areas and Volumes
Concept: Surface Areas and Volumes Examples and Solutions

CBSE previous year question papers Class 10 Mathematics with solutions 2016 - 2017

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