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Class 12
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Study of Physical Properties of Soil
Study of Physical Properties of Soil
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1)
The soil pH is an indication of _______
Clarity of soil.
Texture of the soil.
Acidity or alkalinity of soils.
Nutrient content of the soil.
2)
The majority of plants prefer a very slightly acidic pH of around ________.
10 to 14
3 to 4
6 to 7
1 to 2
3)
A sample soil consists of 12% clay, 55% sand and 31% silt. Find the textural class of the soil using textural triangle.
Silt.
Sandy loam.
Sandy clay loam.
Silty clay.
4)
Which type soil has particle size 0.05–2 mm?
Sand.
Clay.
Silt.
Gravel.
5)
Which particle is the smallest in size?
Silt.
Sand.
Gravel.
Clay.
6)
What is the use of the soil texture triangle?
To determine the water holding capacity of the soil.
Used to find out the pH of soil.
It is a tool used to visualise and understand the meaning of soil texture names.
To calculate the percentage of sand, silt, and clay in soil sample.
7)
A productive soil contains approximately 46% mineral matter, 4% organic matter, 25 % water and 25% _______.
Inorganic matter.
Air.
Nitrogen.
Acidic matter.
8)
"Soil texture" refers to _______________.
The amount of organic matter in a soil.
The amount of inorganic matter in a soil.
The chemical composition of a soil.
The size of the individual soil particles.
9)
An ideal soil should contain _______.
Equivalent portions of sand, silt, clay, and organic matter.
50% clay and 50% sand.
Mostly sand.
Mostly silt.
10)
What is the soil classification system based on?
Its physical properties.
Its smell.
Its chemical properties.
Its colour.
