1. If the aggregates are exceptionally strong then they are having impact value which is?
a) Less than 10
b) Less than 15
c) Less than 30
d) Greater than 30
Explanation: The aggregates which have a less impact value are exceptionally tough, but normally the aggregate upto 30% impact value can be used.
2. The skid number for highways should not be less than __________
a) 55
b) 45
c) 35
d) 25
Explanation: The skid number for highways should not be less than 55 for national highways to ensure smooth ride, if it is less than 55 then suitable precautions have to be taken.
3. The specific gravity for aggregates should be within the range of __________
a) 2.5-2.8
b) 2.6-2.9
c) 2.4-2.6
d) 2.2-2.6
Explanation: The specific gravity for aggregates should be within the range of 2.6-2.9 for pavement construction purposes.
4. The specific gravity for aggregates should be within the range of __________
a) 2.5-2.8
b) 2.6-2.9
c) 2.4-2.6
d) 2.2-2.6
Explanation: The specific gravity for aggregates should be within the range of 2.6-2.9 for pavement construction purposes.
5. The crushing value of the aggregate determines its __________
a) Hardness
b) Strength
c) Toughness
d) Durability
Explanation: The resistance to crushing is referred as strength, whereas the resistance to abrasion is called hardness.
6. The flakiness index for surface dressing should not exceed __________
a) 15%
b) 25%
c) 35%
d) 45%
Explanation: The flakiness index for aggregates that are used in the pavement surface dressing should not exceed 25%, but in any case combined flakiness and elongation index should never exceed 30%.
7. The sum of flakiness index and elongation index should not exceed __________
a) 15
b) 20
c) 30
d) 40
Explanation: IRC recommends the combined flakiness and elongation index not to exceed 30%. for the aggregate that should be used in a highway.
8. Bitumen is obtained from __________
a) Wood
b) Petroleum
c) Coal
d) Kerosene
Explanation: Bitumen is a product that can be obtained from petroleum, bitumen is the most preferred material for pavement now.
9. Tar is obtained from __________
a) Wood
b) Petroleum
c) Coal
d) Kerosene
Explanation: Tar is a byproduct of wood, both tar and bitumen look similar and used for pavement.
10. Bitumen is __________
a) Pyrogenous
b) Natural
c) Either natural or pyrogenous
d) Artificial
Explanation: The bitumen may be natural or pyrogenous which is completely soluble in carbon disulfide and carbon tetrachloride.