RRB JE 2015-27-09-2015-2 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-27-09-2015-2 RRB Questions

31.
At room temperature a semiconductor material is
A.
perfect insulator
B.
superconducting
C.
conducting
D.
slightly conducting
😑 View Answer Rough Work
ANSWER :
D. slightly conducting
32.
Which of the following has highest conductivity?
A.
Silver
B.
Aluminium
C.
Platinum
D.
Tin
😑 View Answer Rough Work
ANSWER :
A. Silver
33.
In TV, an electrical disturbance (noise) affects
A.
neither the video nor the audio signals
B.
only the audio signals
C.
both the video and audio signals
D.
only the video signals
😑 View Answer Rough Work
ANSWER :
D. only the video signals
34.
In a mercury arc rectifier, characteristic blue luminosity is due to
A.
high temperature
B.
electron streams
C.
ionization
D.
colour of mercury
😑 View Answer Rough Work
ANSWER :
C. ionization
35.
The stress below which a material has a high probability of not failing under reversal of stress is known as
A.
Tolerance limit
B.
Elastic limit
C.
Proportional limit
D.
Endurance limit
😑 View Answer Rough Work
ANSWER :
D. Endurance limit
36.
A pycnometer is used to determine
A.
Water content and voids ratio
B.
Specific gravity and dry density
C.
Water content and specific gravity
D.
voids ratio and dry density
😑 View Answer Rough Work
ANSWER :
B. Specific gravity and dry density
37.
For M20 grade of concrete, the maximum shear stress shall not exceed
A.
1.6 N/mm²
B.
1.9 N/mm²
C.
2.8 N/mm²
D.
2.2 N/mm²
😑 View Answer Rough Work
ANSWER :
A. 1.6 N/mm²
38.
Lacings are subjected to
A.
Transverse loading
B.
Axial loading plus bending
C.
Axial loading plus shear force
D.
Axial loading only
😑 View Answer Rough Work
ANSWER :
D. Axial loading only
39.
The flow profile of a fluid depends upon
A.
Velocity of the fluid only
B.
The diameter of the tube only
C.
The Reynold number
D.
The surface roughness
😑 View Answer Rough Work
ANSWER :
C. The Reynold number
40.
In PERT analysis, event means
A.
Start or finish of a task
B.
Time taken for a task
C.
End of an activity
D.
Work involved in the project
😑 View Answer Rough Work
ANSWER :
A. Start or finish of a task