Sardar Krushinagar Dantiwada Agricultural Uiversity 2010 B.Sc Agriculture for competitive -paper14

Two water molecules are held by ________ bond.

(a) Hydrogen (b) ionic (c) covalent (d) negative

The soil having PD 2.50 g/cc and BD 1.25 g/cc will have _____ % porosity.

(a) 45 (b) 50 (c) 55 (d) 60

Total porosity is more in:

(a) Sandy soil (b Loamy soil (c) Clayey soil (d) silty soil

The best agricultural soil structure is:

(a) spheroidal (b) Platy (c) prism (d) columnar

Chemically most active soil separate is

(a) sand (b) silt (c) clay (d) gravel

The common clay mineral found in silt is

(a) montmorillonite (b) mica (c) quartz (d)kaolinite

The lightness or darkness of soil coulour is denoted by:

(a) hue (b) value (c) chroma (d) none of these

Black soil are __________ in organic matter:

(a) Medium (b) Poor (c) High (d) None of these

At FC moisture is held at:

(a) - 31 water potential bar (b) - 1/3 water potential bar

(c) - 15 water potential bar (d) None of these

Organic matter influences water holding capacity of soil in the following manner:

(a) Is not affected at all (b) Is decreased (c) Is stabilized (d) Is increased

Soil containing high proportion of organic matter have the following colour:

(a) Dark colour (b) Yellow colour (c) Red colour (d) Light colour

The components of soil are:

(a) Mineral matter (b) Organic matter (c) Water & Air (d) All of these

Relative proportion of soil separates in sand, silt and clay is termed as:

(a) Soil texture (b) Soil structure (c) Soil porosity (d) None of these

The arrangement of individual soil particles in a specific pattern is called:

(a) Soil texture (b) Soil separates (c) Soil structure (d) None of these

When organic matter is added to the soil:

(a) Bulk density does not change (b) Bulk density is decreased

(c) Bulk density is increased (d) None of these

A branch of soil science which deals with the soil from the crop production point of view:

(a) Pedology (b) Edaphology (c) Ecology (d) Soil geology

An average particle density of soils is:

(a) 1.5 g/cc (b) 2.0 g/cc (c) 2.65 g/cc (d) None of these

The process of determining the amount of sand, silt and clay is known as:

(a) Soil analysis (b) Mechanical analysis (c) Statistical analysis (d) Chemical analysis

Particle density is also known as:

(a) True density (b) Bulk density (c) Apparent density (d) Specific gravity.

The best agricultural soil structure is:

(a) Crumb (b) Platy (c) Columnar (d) Blocky