Q1: Determine the volume of coarse aggregate (in m³), volume of fine aggregate (in m³) and cement (in kg), respectively, for preparing 1 m³ of 1:2:4 (by volume) concrete. (Assume 1 m³ of freshly mixed concrete corresponds to 1.54 m³ dry volume; take 1 m³ of cement = 1500 kg.)
Difficulty: Hard
Q2: As per IS 10262:2019, what is the approximate amount of entrapped air expected in normal (non-air-entrained) concrete when 10 mm nominal maximum size of aggregate is used? (in %)
Difficulty: Medium
Q3: The following statements pertain to mass concreting. Which are correct? S1: Preferred materials are low-heat Portland cement, pozzolanas, aggregates, water, admixture and coolants. S2: Slump of mass concrete shall be the same as or more than ordinary concrete work. S3: Concrete with a low water-cement ratio, correctly consolidated and properly cured provides durability to mass concrete work.
Difficulty: Medium
Q4: Concrete recommended for the construction of radiation shields in nuclear plants is:
Difficulty: Easy
Q5: ‘No-fines concrete’ is used for:
Difficulty: Medium
Q6: The modulus of elasticity of concrete is given by Ec = ……….. MPa (where fck = characteristic compressive strength of the concrete cube).
Difficulty: Easy
Q7: According to IS 456:2000, what should be the unit weight of plain cement concrete?
Difficulty: Easy
Q8: Aerated concrete is ……….. in weight.
Difficulty: Easy
Q9: What is the meaning of the designation ‘M30’ concrete suggested for a reinforced cement concrete work?
Difficulty: Medium
Q10: Which IS code gives the recommended guidelines for concrete mix design?
Difficulty: Easy
Q11: As per IS 456:2000, the minimum grade of concrete for plain concrete and reinforced concrete, respectively, in works exposed directly along the sea coast is:
Difficulty: Medium
Q12: According to IS 456:2000, what is the modulus of elasticity of M25 concrete?
Difficulty: Medium
Q13: ……….. is added to make white concrete.
Difficulty: Medium
Q14: For preparing a test specimen it is necessary:
Difficulty: Easy
Q15: If the size of the specimen used to test the compressive strength of concrete is decreased, then the compressive strength of concrete will:
Difficulty: Medium