1. The fine grain soils are classified according to __________
a) Atterbergs limits
b) Atterbergs charts
c) USCS
d) ISCS
Explanation: The fine grain soils are classified according to Atterberg charts, which are classified as per A-line, they are represented in Atterberg charts and classified as per USCS and ISCS.
2. If the load value at 2.5mm penetration in CBR is 190kg and the load for 5.0mm penetration is 48kg, then the CBR value at 5 mm penetration is?
a) 4.6
b) 4.4
c) 4.3
d) 4.1
Explanation: CBR value at 5.0mm penetration=48*190/2055
=4.4%
3. The plate bearing test is used to evaluate __________
a) Modulus of sub grade reaction
b) Modulus of sub base reaction
c) Modulus of base reaction
d) Modulus of pavement
Explanation: The plate bearing test is used to evaluate the modulus of subgrade reaction “k” which is used in westergards analysis.
4. If the shear strength of the non-cohesive soil is 84KN/m2 and angle of friction is 30 degrees, then the normal strength in KN/m2 is?
a) 140
b) 141
c) 143
d) 145
Explanation:
S=c+σtanθ
84=σtan30
σ=145
5. Stone aggregate do not have to resist __________
a) Weathering effect
b) Traffic load
c) Wheel load stress
d) Soil load
Explanation: Stone aggregate do not have to resist the soil load as they are transferred by foundation only, weathering traffic and wheel load are directly experienced by aggregates.
6. Sand obtained from river is used as __________
a) Course aggregate
b) Fine aggregate
c) Filling materials
d) Substitute
Explanation: Sand obtained from river is used as fine aggregate as it can be used to fill the voids in the concrete, coarse aggregate is obtained from the rock, sand is not used as filling material but stone dust can be used if sand is not available.
7. Soft aggregates are used in __________
a) Lower layers
b) Upper layers
c) Everywhere in the pavement
d) Depends on the material
Explanation: Soft aggregates cannot resist the weathering action and wheel load of the vehicle, so they are preferred in lower layers, as they are impacted directly.
8. Which of the following is a soft aggregate?
a) Brick
b) Gravel
c) Clay
d) Silt
Explanation: Bricks are not actually aggregates, but the crushed bricks or over burnt bricks are used as aggregates in pavement they are not so hard as the hard aggregate.
9. Impact value is used to measure?
a) Hardness
b) Toughness
c) Wheel load
d) Strength
Explanation: The impact value of an aggregate is used to measure its toughness; if it is tough then it has a low impact value, hardness is for resistance to abrasion, strength is resistance to crushing.
10. The capability of aggregate to resist more weathering action and wheel load is called __________
a) Hardness
b) Toughness
c) Durability
d) Angularity
Explanation: Durability is the period till which the aggregate can resist the weathering action and other loads, hardness is the resistance to abrasion and toughness is the resistance to impact.