Practice Test: Question Set - 08
1. Select the incorrect statement
- (A) The loss of pre-stress is more in pre-tensioning
system than in post-tensioning system
- (B) Pre-tensioning system has greater certainty about
its durability
- (C) For heavy loads and large spans in buildings or
bridges, post-tensioning system is cheaper than pre-tensioning system
- (D) None of the above
2. The commercial name of white and colored cement in India, is
- (A) Colorcrete
- (B) Silvicrete
- (C) Snowcem
- (D) All
the above
3. An excess of flaky particles in concrete aggregates
- (A) Decreases
the workability
- (B) Increases
the quantity of water and sand
- (C) More
than 15% are not desirable
- (D) All
the above
4. Increase in the moisture content in concrete
- (A) Reduces the strength
- (B) Increases the strength
- (C) Does not change the strength
- (D) All of the above
5. Pick up the correct statement from the following:
- (A) High
percentage of C3S and low percentage of C2S cause rapid
hardening
- (B) High
percentage of C3S and low percentage of C2S make the
cement less resistive to chemical attack
- (C) Low
percentage of C3S and high percentage of C2S contribute
to slow hardening
- (D) All the
above
6. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
- (A) Between 150
to 300 kg/cm2
- (B) Between 350
to 600 kg/cm2
- (C) Between 150
to 500 kg/cm2
- (D) Below 200
kg/cm2
7. Select the incorrect statement
- (A) Lean mixes bleed more as compared to rich ones
- (B) Bleeding can be minimized by adding pozzolana finer
aggregate
- (C) Bleeding can be increased by addition of calcium
chloride
- (D) None of the above
8. Permissible compressive strength of M 150 concrete grade is
- (A) 100 kg/cm2
- (B) 150 kg/cm2
- (C) 200 kg/cm2
- (D) 250 kg/cm2
9. Cement used for normal concrete construction, is obtained by burning a mixture of
- (A) Siliceous
and argillaceous materials
- (B) Argillaceous
and calcareous materials
- (C) Siliceous
and calcareous materials
- (D) Siliceous,
argillaceous and calcareous materials
10. As compared to ordinary Portland cement, high alumina cement has
- (A) Higher initial setting time but lower final setting
time
- (B) Lower initial setting time but higher final setting
time
- (C) Higher initial and final setting times
- (D) Lower initial and final setting times
11. The maximum amount of dust which may be permitted in aggregates is
- (A) 5%
of the total aggregates for low workability with a coarse grading
- (B) 10%
of the total aggregates for low workability with a fine grading
- (C) 20%
of the total aggregates for a mix having high workability with fine grading
- (D) All the
above
12. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
- (A) 0.1P +
0.3Y + 0.1Z = W/C × P
- (B) 0.3P +
0.1Y + 0.01Z = W/C × P
- (C) 0.4P +
0.2Y + 0.01Z = W/C × P
- (D) 0.5P +
0.3Y + 0.01Z = W/C × P
13. Examine the following statements:
(i) Factor of safety for steel should be
based on its yield stress,
(ii) Factor of safety for steel should be
based on its ultimate stress,
(iii) Factor of safety for concrete should
be based on its yield stress,
(iv) Factor of safety for concrete should be
based on its ultimate stress.
The correct statements are
- (A) (i) and (iii)
- (B) (i) and (iv)
- (C) (ii) and (iii)
- (D) (ii) and (iv)
14. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
- (A) 7.30
- (B) 7.35
- (C) 7.40
- (D) 7.45
15. Bulking of sand is
- (A) Mixing
of different sizes of sand particles
- (B) Mixing of
lime with sand
- (C) Maximum
water with sand
- (D) Swelling of
sand when wetted
Next Tests: