Concrete Technology Mock test – 6 || Civil Engineering Mock tests Welcome to your Concrete Technology Mock test - 6 Take an exciting test in Concrete Technology You have only 20 mins to complete the test (25 Questions) Wish you all the best!!! Name Email 1. In case of hand mixing of concrete, the extra cement to be added is (A) 5 % (B) 10 % (C) 15% (D) 20 %2. Air entrainment in the concrete increases (A) Workability (B) Strength (C) The effects of temperature variations (D) The unit weight3. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called (A) Balanced beam (B) Under-reinforced beam (C) Over-reinforced beam (D) None of the above4. The rock which is not calcareous, is: (A) Lime stone (B) Chalk (C) Laterite (D) None of these5. The mixture of different ingredients of cement, is burnt at (A) 1000°C (B) 1200°C (C) 1400°C (D) 1600°C6. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by (A) 10 % (B) 20 % (C) 30% (D) 40 %7. Minimum thickness of load bearing RCC wall should be (A) 50 mm (B) 100 mm (C) 150 mm (D) 200 mm8. The load factors for live load and dead load are taken respectively as (A) 1.5 and 2.2 (B) 2.2 and 1.5 (C) 1.5 and 1.5 (D) 2.2 and 2.29. Strength of concrete increases with (A) Increase in water-cement ratio (B) Increase in fineness of cement (C) Decrease in curing time (D) Decrease in size of aggregate10. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between (A) 1100° and 1200°C (B) 1200° and 1300°C (C) 1300° and 1400°C (D) 1400° and 1500°C 11. The maximum value of hoop compression in a dome is given by (A) wR / 4d (B) wR/2d (C) wR/d (D) 2wR/d12. If the storey height is equal to length of RCC wall, the percentage increase in strength is (A) 0 (B) 10 (C) 20 (D) 3013. A T-shaped retaining wall mainly consists of (A) One cantilever (B) Two cantilevers (C) Three cantilevers (D) Four cantilevers14. The most commonly used admixture which prolongs the setting and hardening time is (A) Gypsum (B) Calcium chloride (C) Sodium silicate (D) All of the above15. The recommended value of modular ratio for reinforced brick work is (A) 18 (B) 30 (C) 40 (D) 5816. Maximum distance between expansion joints in structures as per IS: 456 1978 is (A) 20 m (B) 30 m (C) 45 m (D) 60 m17. In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always (A) Zero (B) Tensile (C) Compressive (D) Tensile or compressive18. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by (A) fcr - fcs = fcl (B) fcr > fcs > fcl (C) fcr < fcs < fcl (D) fcs > fcr > fcl19. During erection, the pile of length is supported by a crane at a distance of (A) 0.207 l (B) 0.293 l (C) 0.707 l (D) 0.793 l20. In a pile of length , the points of suspension from ends for lifting it are located at (A) 0.207 l (B) 0.25 l (C) 0.293 l (D) 0.333 l21. If X, Y and Z are the fineness modulli of coarse, fine and combined aggregates, the percentage (P) of fine aggregates to combined aggregates, is (A) P = [(Z - X)/(Z - Y)] × 100 (B) P = [(X - Z)/(Z - Y)] × 100 (C) P = [(X - Z)/(Z + Y)] × 100 (D) P = [(Z + X)/(Z - Y)] × 10022. The fineness modulus of fine aggregate is in the range of (A) 2.0 to 3.5 (B) 3.5 to 5.0 (C) 5.0 to 7.0 (D) 6.0 to 8.523. Permissible compressive strength of M 300 concrete grade is (A) 100 kg/cm2 (B) 150 kg/cm2 (C) 200 kg/cm2 (D) 300 kg/cm224. An aggregate is said to be flaky, if its least dimension is less than (A) 2/3 mean dimension (B) 3/4 mean dimension (C) 3/5 mean dimension (D) 5/8 mean dimension25. The percentage of voids in cement is approximately (A) 25 % (B) 40 % (C) 60% (D) 80 %