**CLASS 10**

**CBSE**

**Maths Basic**

**2021-22**

Section A

Find the values of k for which the quadratic equation 3`x^2` + `kx` + 3 = 0 has real and equal roots.

Three cubes each of volume 64`"cm"^3` are joined end to end to form a cuboid. Find the total surface area of the cuboid so formed?

An inter house cricket match was organized by a school. Distribution of runs made by the students is given below. Find the median runs scored.

Runs scored | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 |

Number ofstudents | 4 | 6 | 5 | 3 | 4 |

Find the common difference of the AP 4,9,14,… If the first term changes to 6 and the common difference remains the same then write the new AP.

The mode of the following frequency distribution is 38. Find the value of x.

Runs scored | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |

Number ofstudents | 7 | 9 | 12 | 16 | x | 6 | 11 |

XY and MN are the tangents drawn at the end points of the diameter DE of the circle with centre O. Prove that XY || MN.

In the given figure, a circle is inscribed in the quadrilateral ABCD. Given AB=6cm, BC=7cm and CD=4cm. Find AD.

Section C

Long Answer type Questions

Long Answer type Questions

An AP 5, 8, 11…has 40 terms. Find the last term. Also find the sum of the last 10
terms.

A tree is broken due to the storm in such a way that the top of the tree touches the
ground and makes an angle of 300 with the ground. Length of the broken upper part
of the tree is 8 meters. Find the height of the tree before it was broken.

Two poles of equal height are standing opposite each other on either side of the
road 80m wide. From a point between them on the road the angles of elevation of
the top of the two poles are respectively 600 and 300
. Find the distance of the point
from the two poles.

PA and PB are the tangents drawn to a circle with centre O. If PA= 6 cm and APB=`60^0`, then find the length of the chord AB.

The sum of the squares of three positive numbers that are consecutive multiples of 5 is 725. Find the three numbers.

Section C

Construct two concentric circles of radii 3cm and 7cm. Draw two tangents to the smaller circle from a point P which lies on the bigger circle.

Draw a pair of tangents to a circle of radius 6cm which are inclined to each other at an angle of `60^0`. Also find the length of the tangent.

The following age wise chart of 300 passengers flying from Delhi to Pune is prepared by the Airlines staff.

Age | Lessthan 10 | Lessthan 10 | Lessthan 10 | Lessthan 10 | Lessthan 10 | Lessthan 10 | Lessthan 10 | Lessthan 10 |

Number ofpassengers | 14 | 44 | 82 | 132 | 184 | 245 | 287 | 300 |

A lighthouse is a tall tower with light near the top. These are often built on islands,
coasts or on cliffs. Lighthouses on water surface act as a navigational aid to the
mariners and send warning to boats and ships for dangers. Initially wood, coal would
be used as illuminators. Gradually it was replaced by candles, lanterns, electric lights.
Nowadays they are run by machines and remote monitoring.

Prongs Reef lighthouse of Mumbai was constructed in 1874-75. It is approximately 40 meters high and its beam can be seen at a distance of 30 kilometres. A ship and a boat are coming towards the lighthouse from opposite directions. Angles of depression of flash light from the lighthouse to the boat and the ship are 30 0 and 600 respectively.

i) Which of the two, boat or the ship is nearer to the light house. Find its distance from the lighthouse?

ii) Find the time taken by the boat to reach the light house if it is moving at the rate of 20 km per hour.

Prongs Reef lighthouse of Mumbai was constructed in 1874-75. It is approximately 40 meters high and its beam can be seen at a distance of 30 kilometres. A ship and a boat are coming towards the lighthouse from opposite directions. Angles of depression of flash light from the lighthouse to the boat and the ship are 30 0 and 600 respectively.

i) Which of the two, boat or the ship is nearer to the light house. Find its distance from the lighthouse?

ii) Find the time taken by the boat to reach the light house if it is moving at the rate of 20 km per hour.

Krishnanagar is a small town in Nadia District of West Bengal. Krishnanagar clay
dolls are unique in their realism and quality of their finish. They are created by
modelling coils of clay over a metal frame. The figures are painted in natural colours
and their hair is made either by sheep’s wool or jute. Artisans make models starting
from fruits, animals, God, goddess, farmer, fisherman, weavers to Donald Duck and
present comic characters. These creations are displayed in different national and
international museums.

Here are a few images (not to scale) of some clay dolls of Krishnanagar.

Here are a few images (not to scale) of some clay dolls of Krishnanagar.

The ratio of diameters of red spherical apples in Doll-1 to that of spherical
oranges in Doll-2 is 2:3. In Doll-3, male doll of blue colour has cylindrical body and
a spherical head. The spherical head touches the cylindrical body. The radius of
both the spherical head and the cylindrical body is 3cm and the height of the
cylindrical body is 8cm. Based on the above information answer the following
questions:

i) What is the ratio of the surface areas of red spherical apples in
Doll-1 to that of spherical oranges in Doll-2.?

ii) The blue doll of Doll-3 is melted and its clay is used to make the
cylindrical drum of Doll-4. If the radius of the drum is also 3cm,
find the height of the drum.