Geometry and Mensuration: Level 1 Test 7

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Geometry and Mensuration: Level 1 Test 7

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Question 1

The area of the largest circle that can be drawn inside a rectangle with side 18 cm and 14 cm is

A	49 cm²
B	154 cm²
C	378 cm²
D	1078 cm²

Question 1 Explanation:

The largest circle will have a diameter of side = 14 cm.
The radius = 7 cm
The area = Πr²= 22/7 x 7²=154 cm

Question 2

Three identical cones with base radius r are placed on their bases so that each in touching the other two. The radius of the circle drawn through their vertices is :

A	Smaller than r
B	Equal to r
C	Larger than r
D	Depends on the height of the cones

Question 2 Explanation:

$\displaystyle \begin{array}{l}The\text{ }length\text{ }of\text{ }the\text{ }side\text{ }of\text{ }the\text{ }equilateral\text{ }triangle\\formed\text{ }by\text{ }joining\text{ }the\text{ }center\text{ }of\text{ }the\text{ }bases\text{ }of\text{ }the\text{ }cones\text{ }=\text{ }2r\text{ }units.\\The\text{ }radius\text{ }of\text{ }the\text{ }circle\text{ }drawn\text{ }through\text{ }the\text{ }vertices\\\text{ }is\text{ }actually\text{ }the\,\,2/3\text{ }of\text{ }the\text{ }altitude\text{ }of\text{ }the\text{ }triangle\text{ }\\=~\frac{\frac{2}{3}\times \sqrt{3}}{2}2r\,\,=\,\,\frac{2\times 1.7}{3}r>r\\Thus\text{ }correct\text{ }option\text{ }is\text{ }\left( c \right)\end{array}$

Question 3

A conical vessel of base radius 2 cm and height 3 cm is filled with kerosene. This liquid leaks through a hole in the bottom and collects in a cylindrical jar of radius 2 cm. The kerosene level in the jar is

A	∏cm
B	1.5 cm
C	1 cm
D	3 cm

Question 3 Explanation:

$\displaystyle \begin{array}{l}The\text{ }kerosene\text{ }level\text{ }=\text{ }height\text{ }of\text{ }the\text{ }cylinder\text{ }\left( liquid\text{ }level \right)\\\frac{1}{3}\times \pi \times {{\left( 2 \right)}^{2}}\times 3=\pi \times {{\left( 2 \right)}^{2}}\times h\\\Rightarrow \,\,h=1\,\,cm\end{array}$

Question 4

The diameter of hollow cone is equal to the diameter of a spherical ball. If the ball is placed at the base of the cone, what portion of the ball will be outside the cone?

A	50%
B	Less than 50%
C	More than 50%
D	100%

Question 4 Explanation:

The diameter of both the shapes is same and thus we can conclude that for a height of the radius of the sphere the volume of the cone is always less than the sphere.
Thus the sphere will remain outside the cone by more than 50% always.

Question 5

The diagonals of a rhombus are 24 cm and 10 cm. Its area is