MCQ 1 Examine the following statements:

Statement i : Factor of safety for steel should be based on its yield stress

Statement ii : Factor of safety for steel should be based on its ultimate stress

Statement iii : Factor of safety for concrete should be based on its yield stress

Statement iv : Factor of safety for concrete should be be based on its ultimate stress

The correct statements are

(A) i and ii (B) ii and iv (C) i and iv (D) ii and iii

MCQ 2 The effort of adding calcium chloride in concrete is

Statement i : To increase shrinkage

Statement ii : To decrease shrinkage

Statement iii : To increase setting time

Statement iv : To decrease setting time

The correct answer is

(A) (ii) and (iv) (B) (ii) and (iii) (C) (i) and (iii) (D) (i) and (iv)

MCQ 3 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

MCQ 14 Air entrainment in the concrete increases

(A) Workability (B) Strength (C) The efforts of temperature variations (D) The unit weight

MCQ 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

MCQ 5 Admixtures which causes early setting, and hardening of concrete are called

(A) Workability admixtures (B) Accelerators (C) Retarders (D) Air entraining agents

MCQ 13 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 above

MCQ 15 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

MCQ 11 Modulus of rupture is a measure of

(A) Flexural tensile strength (B) Direct tensile strength (C) Compressive strength (D) Split tensile strength

MCQ 6 Poisson?s ratio for concrete

(A) Remains constant (B) Increases with richer mixes (C) Decreases with richer mixes (D) None of the above

MCQ 12 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 8.5

MCQ 7 The factor of safety for

(A) Steel and concrete are same (B) Steel is lower than that for concrete (C) Steel is higher than that for concrete (D) None of the above

MCQ 10 Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

(A) M15 (B) M20 (C) M10 (D) M25

MCQ 8 In case of hand mixing of concrete, the extra cement to be added is

(A) 5% (B) 10% (C) 15% (D) 20%

MCQ 9 The ratio of diameter of reinforcing bars and slab thickness is

(A) 1/4 (B) 1/5 (C) 1/6 (D) 1/8