1. To prevent the cement bags from any possible contact with moisture, the main point that should be kept in mind is that the ?

space between the exterior walls and piles should be 30 cm

cement bags should be placed closer together in the piles

width and height of the pile should not exceed 3 m and 2.70 m respectively

all of the above

Answer: all of the above

Explanation:


2. The workability of concrete can be improved by adding ?

hydrated lime

flyash

calcium chloride

all of these

Answer: all of these

Explanation:


3. If the effective plan area of a warehouse is 54 m², and the maximum height of pile permitted is I then the number of cement bags to be stored is ?

2000

2200

2500

2700

Answer: 2700

Explanation:


4. The water used for ordinary concrete is equal to 5% by weight of aggregate plus ....... by weight of cement ?

10%

20%

30%

40%

Answer: 30%

Explanation:


5. The slump test of concrete is used to measure ?

consistency

mobility

homogeneity

all of these

Answer: consistency

Explanation:


6. For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed ?

10 mm

15 mm

20 mm

40 mm

Answer: 15 mm

Explanation:


7. The-concrete can be lifted by pumps through a maximum vertical distance of ?

10 m

20 m

30 m

50 m

Answer: 50 m

Explanation:


8. The internal friction between the ingredients of concrete is minimised by ?

adopting coarse aggregates

using more water

reducing the surface area

all of these

Answer: all of these

Explanation:


9. The apparent specific gravity of an aggregate is defined as ?

the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles

the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles

the weight of aggregate required to fill a container of unit volume

the difference in weight of the aggregate in saturated surface dry condition and in moist condition

Answer: the weight of oven dry aggregate divided by its absolute volume, excluding the natural pores in the aggregate particles

Explanation:


10. The usual proportion of ingredients in plain cement concrete is ?

Portland cement (1 part), clean sand (1 and 1/2 to 8 parts) and coarse aggregate (3 to 16 parts)

Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1 and 1/2 to 8 parts)

Portland cement (1 part), clean sand and coarse aggregate (1 and 1/2 to 8 parts)

any one of the above

Answer: Portland cement (1 part), clean sand (1 and 1/2 to 8 parts) and coarse aggregate (3 to 16 parts)

Explanation: