Building Materials PYQs, GPSC Civil Previous Year Questions

1. The strength of Class-II bricks used in construction shall not be less then

A) 50 kg/cm²
B) 75 kg/cm²
C) 35 kg/cm²
D) 20 kg/cm²

Check Answer

B) 75 kg/cm²

2. Le Chatelier’s device is used for determining the

A) Setting time of cement
B) Soundness of cement
C) Tensile strength of cement
D) Compressive strength of cement

Check Answer

B) Soundness of cement

3. The quality of cement is tested by

A) bond strength
B) flexural strength
C) compressive strength
D) Tensile strength

Check Answer

C) compressive strength

4. Which of the following raw material is responsible for controlling the strength and soundness of Portland cement

A) CaO
B) SiO₂
C) Al₂O₃
D) Fe₂O₃

Check Answer

A) CaO

5. Which test is carried out to know about free limit in cement ?

A) Consistency test
B) Soundness test
C) Setting time test
D) Fineness test

Check Answer

B) Soundness test

6. Initial setting time of cement shall not be less than _______

A) 60 min.
B) 30 min.
C) 45 min.
D) 75 min.

Check Answer

B) 30 min.

7. What is the maximum permissible additives in cement for construction as per IS code ?

A) 5%
B) 3%
C) 2%
D) 4%

Check Answer

C) 2%

8. The volume of 50 kg cement bag will be

A) 0.034 m³
B) 1.25 m³
C) 0.050 m³
D) 0.283 m³

Check Answer

A) 0.034 m³

9. Which compound has maximum percentage proportion in cement ?

A) C₃A
B) C₄AF
C) C₃S
D) C₂S

Check Answer

C) C₃S

10. Aggregate impact value gives an indication of aggregate ?

A) Wearing capacity
B) Water resistance
C) Water absorption
D) Toughness

Check Answer

D) Toughness

11. The ratio of tensile strength to compressive strength of concrete is about

A) ¹/₁₀
B)¹/₂
C)¹/₂₀
D)¹/₅

Check Answer

A) ¹/₁₀

12. Rebound hammer test is useful for determination of _______ of hardened concrete

A) permeability
B) compressive strength
C) tensile strength
D) shear strength

Check Answer

B) compressive strength

13. In fresh concrete, if sugar is added and concrete is mixed. The observed effect is _______

A) No effect
B) delay in setting time of cement concrete
C) improvement in concrete strength
D) acceleeation in setting time of cement concrete

Check Answer

B) delay in setting time of cement concrete

14. Plain cement concrete is strong in taking

A) shear stress
B) all of three mentioned here
C) tensile stress
D) compressive stress

Check Answer

D) compressive stress

15. The breaking up of cohesion in a mass of concrete is called

A) segregation
B) creep
C) workability
D) bleeding

Check Answer

A) segregation