Practice Test: Question Set - 03
1. Pick up the incorrect statement from the following:
- (A) The degree
of grinding of cement, is called fineness
- (B) The process
of changing cement paste into hard mass, is known as setting of cement
- (C) The
phenomenon by virtue of which cement does not allow transmission of sound, is
known as soundness of cement
- (D) The
heat generated during chemical reaction of cement with water, is known as heat of hydration
2. Concrete gains strength due to
- (A) Chemical
reaction of cement with sand and coarse aggregates
- (B) Evaporation
of water from concrete
- (C) Hydration of
cement
- (D) All the
above
3. To determine the modulus of rupture, the size of test specimen used is
- (A) 150 × 150 × 500 mm
- (B) 100 × 100 × 700 mm
- (C) 150 × 150 × 700 mm
- (D) 100 × 100 × 500 mm
4. Tricalcium aluminate (C3A)
- (A) Reacts fast
with water
- (B) Generates
less heat of hydration
- (C) Causes
initial setting and early strength of cement
- (D) Does not
contribute to develop ultimate strength
5. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is
- (A) M 100
- (B) M 150
- (C) M 200
- (D) M 250
6. Admixtures which cause early setting and hardening of concrete are called
- (A) Workability admixtures
- (B) Accelerators
- (C) Retarders
- (D) Air entraining agents
7. Pick up the correct statement from the following:
- (A) Sand
stones may be divided into calcareous, siliceous and ferruginous sand stones
- (B) Concrete
using sand stones, cracks due to excessive shrinkage
- (C) Broken
bricks produce a concrete having good fire resisting qualities
- (D) All the
above
8. Pick up the incorrect statement from the following:
- (A) Admixtures
accelerate hydration
- (B) Admixtures
make concrete water proof
- (C) Admixtures
make concrete acid proof
- (D) Admixtures
give high strength
9. For a reinforced concrete section, the shape of shear stress diagram is
- (A) Wholly parabolic
- (B) Wholly rectangular
- (C) Parabolic above neutral axis and rectangular below
neutral axis
- (D) Rectangular above neutral axis and parabolic below neutral
axis
10. Allowable shear strength of concrete, depends upon
- (A) Shear
strength
- (B) Tensile
strength
- (C) Compressive
strength
- (D) None of
these
11. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
- (A) 20 times
- (B) 25 times
- (C) 30 times
- (D) 50 times
12. The individual variation between test strength of sample should not be more than
- (A) ±5 % of average
- (B) ± 10 % of average
- (C) ± 15 % of average
- (D) ± 20 % of average
13. Pick up the incorrect statement from the following. For performing compressive strength test of cement
- (A) Cement and
standard sand mortar are used in the ratio of 1 : 3
- (B) Water is
added at the rate of (P/4) +
3.0 percentage of water where P is the percentage of water for
standard consistency
- (C) A cube mould
of 10 cm × 10 cm × 10 cm is used
- (D) The prepared
moulds are kept in a atmosphere of 50% relative humidity
14. Pick up the incorrect statement from the following:
- (A) Concrete
for which preliminary tests are conducted, is called controlled concrete
- (B) Bulking
of sand depends upon the fineness of grains
- (C) Concrete
mix 1 : 6 : 12, is used for mass concrete in piers
- (D) All the
above
15. The slab is designed as one way if the ratio of long span to short span is
- (A) Less than 1
- (B) Between 1 and 1.5
- (C) Between 1.5 and 2
- (D) Greater than 2
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