1. The bitumen is completely soluble in __________
a) Carbon monoxide
b) Carbon dioxide
c) Carbon sulfide
d) Carbon disulfide
Explanation: Bitumen is completely soluble in carbon disulfide and carbon terachloride, these are the chemical substances in which bitumen dissolves completely.
2. The resistance to flow is measured by __________
a) Flash and fire
b) Viscosity
c) Penetration test
d) Ductility test
Explanation: The resistance to flow of the liquid is called as viscosity, the other tests are also conducted for bitumen, in viscosity the viscosity grade of bitumen is obtained.
3. The solvent used in cut back bitumen is __________
a) Kerosene
b) Oil
c) Petrol
d) Diesel
Explanation: The solvent mostly used in the cutback bitumen is kerosene, this bitumen is economical than others, oil petrol and diesel are inflammables so they should not be preferred.
4. The bitumen surface becomes stiff in __________
a) Summer
b) Winter
c) Rainy
d) Spring
Explanation: The bitumen becomes softer in summer due to heating and stiffer in winter due to cooling.
5. Which bitumen does not need heating?
a) Paving grade
b) Cut back
c) Modified
d) Bitumen emulsion
Explanation: The cutback bitumen which is the most economical type may or may not require heating, whereas the remaining required to be heated.
6. The distance between two samples in penetration test should be __________
a) 10mm
b) 15mm
c) 20mm
d) 25mm
Explanation: The minimum distance between samples must be 10mm in a penetration test, if it is less than 10 mm then there is no accurate value for penetration.
7. The SI unit of viscosity is?
a) Stoke
b) Pascal
c) Pascal second
d) Dynes
Explanation: The SI unit of viscosity is Pascal second, Pascal is for pressure, Stoke is CGS unit, Dynes is also a CGS unit.
8. The temperature in penetration test is __________
a) 25
b) 30
c) 27
d) 35
Explanation: The room temperature of the bitumen test is considered as 25 as per theory, practically it may not be possible, it may be 27 to 35 also in India.
9. The softening point of bitumen in the given options (in degree Celsius) will be __________
a) 25
b) 30
c) 35
d) 80
Explanation: The softening point of bitumen may be between 35 and 70 in most of the cases, so here 35 is the most appropriate.
10. The cement used in water logged areas is __________
a) Portland cement
b) Hydrophobic cement
c) Quick setting cement
d) Reediest cement
Explanation: The cement mostly used in water logged areas is hydrophobic cement as it will resist the water from clogging.