# Practice Test: Question Set - 22

**1. In case of hand mixing of concrete, the extra cement to be added is**

- (A) 5 %

- (B) 10 %

- (C) 15 %

- (D) 20 %

**2. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,**

- (A) 20 %

- (B) 25 %

- (C) 30 %

- (D) 35 %

**3. The percentage of voids in cement is approximately**

- (A) 25 %

- (B) 40 %

- (C) 60 %

- (D) 80 %

**4. Water required per bag of cement, is**

- (A) 7 kg

- (B) 14 kg

- (C) 21 kg

- (D) 35 kg

**5. The recommended value of modular ratio for reinforced brick work is**

- (A) 18

- (B) 30

- (C) 40

- (D) 58

**6. For an ordinary Portland cement**

- (A) Residual
does not exceed 10% when sieved through IS Sieve No. 9

- (B) Soundness
varies from 5 to 10 mm

- (C) Initial
setting time is not less than 30 minutes

- (D) Compressive
stress after 7 days, is not less than 175 kg/cm

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**7. The ratio of the diameter of reinforcing bars and the slab thickness is**

- (A) 1/4

- (B) 1/5

- (C) 1/6

- (D) 1/8

**8. Pozzolana cement is used with confidence for construction of**

- (A) Dams

- (B) Massive
foundations

- (C) R.C.C.
structures

- (D) All the
above

**9. Pick up the correct statement from the following:**

- (A) Calcium
chloride acts as a retarder

- (B) Calcium
chloride acts as an accelerator

- (C) Gypsum
(calcium sulphate) acts as a retarder

- (D) Both (b) and
(c)

**10. The operation of removing humps and hollows of uniform concrete surface, is known as**

- (A) Floating

- (B) Screeding

- (C) Trowelling

- (D) Finishing

**11. 1% of voids in a concrete mix would reduce its strength by about**

- (A) 5 %

- (B) 10 %

- (C) 15 %

- (D) 20 %

**12. Permissible compressive strength of M 200 concrete grade is**

- (A) 100 kg/cm

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- (B) 150 kg/cm

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- (C) 200 kg/cm

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- (D) 250 kg/cm

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**13. For a continuous slab of 3 m × 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is**

- (A) 50 mm

- (B) 75 mm

- (C) 100 mm

- (D) 120 mm

**14. The most useless aggregate is one whose surface texture is**

- (A) Smooth

- (B) Granular

- (C) Glassy

- (D) Honey
combed and porous

**15. The shrinkage of concrete**

- (A) Is
proportional to water content is the mix

- (B) Is
proportional to cement concrete

- (C) Increases
with age of concrete

- (D) All the
above

**View All Answers**

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