Concrete Technology Objective Questions with Answers pdf Download - Set 03 - ObjectiveBooks

Concrete Technology Objective Questions with Answers pdf Download - Set 03

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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