21) Enoscope used for spot speed study is a
(a) manual counter
(b) automatic recorder
(c) electronic
(d) none of the above
22) Which of the following is indicated by a warning sign ?
a) level crossing
b) no parking
c) end of speed limit
d) overtaking prohibited
23) In case of reinforced concrete pavem ents of 150 mm thickness, maximum spacing between any
two longitudinal joints may be
(a) 4.5 m
(b) 7.5 m
(c) 11.0 m
(d) 13 m
24)An Enoscope is used for measuring
a) Running speed
b) Time mean speed
c) spot speed
d) overall speed
25) Postcard survey may be used to study
(a) spot speed study
(b) speed and delay study
(c) origin destination study
(d) parking studies
26) The traffic conflicts that may occur in a rotary intersection are
a) merging and diverging
b) crossing and merging
c) crossing and diverging
d) crossing, merging and diverging
27) For an earthen road, the minimum desirable grade is
(a) 1 in 12
(b) 1 in 20
(c) 1 in 80
(d) 1 in 120
28) The maximum thickness of expansion joint in rigid pavements is
a) zero
b) 25 mm
c) 50 mm
d) 100 mm
29) In reinforced cement concrete pavements, steel is placed
a) near bottom
b) in the middle
c) near the top
d) exactly at neutral axis
30) If the pressure carried by a CBR specimen at 2.5 mm penetration is 3.5 N/mm2, the CBR of the soil is
a) 10%
b) 35%
c) 50%
d) 70%