1. A square pit, known as _________ with side as about 1.50 m, is excavated upto a depth at which sufficiently hard soil is available.
a) Test pits
b) Probing
c) Test piles
d) Deep boring
Discussion
Explanation: Using Trail pits or Test pits, various Tata of the soil can be inspected, studied and classified accordingly. This method is useful when hard soil is available within a maximum depth of 1.50 metre.
2. _________ consists of driving either a hollow tube or a steel rod or an iron rod into the ground.
a) Trail pits
b) Test piles
c) Probing
d) Digging
Discussion
Explanation: In Probing, a hollow tube of diameter 35 mm to 50 mm is taken. The tube is driven into the ground 300 mm or so at a time. It is then withdrawn and the material caught in the slit is inspected.
3. The ____________ is the term used to denote a method in which case is driven into the ground and the material inside the casing is washed out and brought to the surface for inspection.
a) Deep boring
b) Percussion boring
c) Rotary drilling
d) Wash boring
Discussion
Explanation: The process of wash boring consists in driving an inner tube of diameter 25 mm to 50 mm, inside an outer tube of diameter 100 mm to 150 mm. Whereas, percussion boring and rotary drilling are the types of Deep boring.
4. The method in which 4 electrons are driven in the ground at equal distance apart and in a straight line upto a depth which the ground distance is to be measured.
a) Seismic refraction method
b) Geophysical method
c) Electrical resistivity method
d) Current extraction method
Discussion
Explanation: This method is based on the principle that each soil has different electrical resistivity, depending upon its water content, compaction and composition. For instance, the saturated soil will have lower electrical resistivity as compared to the loose dry gravel or solid rock.
5. The number of blows required to drive the penetrometer into the ground through a distance of 300 mm is measured which is known as _____________ of the soil.
a) Standard penetration resistance
b) Bearing power of soil
c) Maximum safe bearing capacity
d) Allowable bearing pressure
Discussion
Explanation: The bearing capacity and the other engineering properties of certain types of soil are they known by referring to the curves correlating Standard Penetration Resistance or SPT and the corresponding characteristics of soil. The values of SPT of soil and different depths are determined.
6. The resistance of the soil with depth is measured by means of a tool known as the _______
a) Seismometer
b) Potentiometer
c) Penetrometer
d) Ammeter
Discussion
Explanation: The penetrometer is used under static or dynamic loading which may consist of a sampling spoon, a cone or tool of other shape. The penetrometer is driven in the ground with the help of blows from a 650 N weight falling from a height of 750 mm.
7. The shock waves so produced travel down in the sub soil strata and get reflected after striking a hard rock surface below and recorded by the instrument known as ___________
a) Microphone
b) Geophone
c) Receiver
d) Sensors
Discussion
Explanation: A number of geophones are arranged along a line. Some of the waves, known as direct or primary waves, are picked first buy Geophones. The Other waves which travel down through the soil get reflected after striking a hard rock surface below.
8. What is the average depth of a Test pit?
a) 10 m
b) 2 m
c) 1.50 m
d) 15 m
Discussion
Explanation: Test Pit is excavated up to a depth about 1.50 m at which sufficiently hard soil is available. The various data of soil can be inspected, studied and classified accordingly. This method is useful when hard soil is available within a maximum depth of 1.50 m.
9. _________ is used to indicate the maximum load per unit area which the soil will resist safely without displacement.
a) Bearing power
b) Maximum safe bearing capacity
c) Strength of soil
d) Allowable bearing pressure
Discussion
Explanation: The Load of the structure is ultimately coming on the soil and hence it is of utmost importance to know the strength and behaviour of the soil. Dividing the ultimate bearing power of soil by a factor of safety, the safe bearing capacity of soil is obtained.
10. The term _________ on soil is used to indicate the maximum pressure which can be exerted on soil while taking into account shear failure, settlement and the ability of structure to resist settlement.
a) Bearing capacity
b) Net pressure intensity
c) Allowable bearing pressure
d) Maximum safe bearing capacity
Discussion
Explanation: The value of Allowable Bearing Pressure on soil depends on the nature of ground and the type of building. The maximum safe bearing capacity of soil is generally more than the allowable bearing pressure on soil.