Consider the following statements regarding pavements: 1. Rigid pavements are more suitable than flexible pavements for stage construction. 2. Rigid pavements are more affected by temperature variations than flexible pavements. 3. In a flexible pavement, any deformation in the top layers is transferred to under- laid layers; but, in rigid pavements, there is slab or beam action due to which any deformation is only in the top layer of the concrete slab. Which of the above statements are correct?

Consider the following statements regarding pavements: (i) Rigid pavements have good night visibility than flexible pavements. (ii) It is possible to make cross-cutting of the rigid pavement. (iii) In a flexible pavement, any deformation in the top layers is transferred to the under-laid layers; but, in rigid pavements, there is slab or beam action due to which any deformation is only in the top layer of the concrete slab. Which of the above statements are correct?

A

(i) and (ii)

B

(ii) and (iii)

C

(i) and (iii)

D

(i), (ii) and (iii)

Which of the following statements are correct regarding Westergard’s concept for temperature stresses? 1. During the day, the top of the pavement slab gets heated under the sunlight when the bottom of the slab becomes hot 2. During summer season as the mean temperature of the slab increases, the concrete pavement expands towards the expansion joints 3. Due to frictional force at the interface, compressive stress is developed at the bottom of the slab as it tends to expand.

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

Consider the following statements with regards to the shear force diagram for the beam ABCD: 1. The beam ABCD is an overhanging beam having supports at A and D only. 2. The beam carries a point load of 20 kN at C. 3. The beam carries a concentrated load of 10 kN at the end B. 4. The beam is an overhanging beam having supports at C and D only. 5. The beam carries a uniformly distributed load of 70 kN over the left hand portion AC only. Which of the above statements are correct?

A

1, 2 and 3 only

B

1, 3 and 5 only

C

2, 3 and 4 only

D

2, 4 and 5 only

Consider the following statements regarding types of supports and beams: 1. When both supports of beams are roller supports, the beam is known as simply supported beam. 2. A beam with one end fixed and the other end free is known as fixed beam. 3. A beam with both ends fixed is known as cantilever beam. 4. A beam with one end fixed and the other simply supported is known as propped cantilever. Which of the above statements is/are correct ?

A

1 only

B

1 and 4 only

C

1, 3 and 4 only

D

2, 3 and 4 only

Some small cubes of same height 7 cm but variable length and width are put inside a large cuboid of height 21 cm. Length and width of cuboid is 32 cm and 24 cm, respectively. Small cubes are put such that cubes at the bottom most layer is of similar base area; second layer contains all the cubes of similar base area and third layer have all the cubes of similar base area. Which of the following statement(s) given below is / are TRUE? A: If side of each small cubes at bottom most layer is 8 cm, then maximum number of small cubes that can be put at bottom most layer is 12. B: If maximum of 48 cubes can be put at second layer, then side of each cube at second layer is 6 cm. C: If side of each small cubes at third layer is 1.6 cm, then maximum number of small cubes that can be put at third layer is 300.

A

C

B

A and B

C

A and C

D

B and C

Which one of the following is not correct about English bond? a) Bricks in one layer are laid on header bond and courses above and below are stretcher bond b) Bricks in one layer are laid on stretcher bond and courses above and below are header bond c) Every layer of bricks is laid on header and stretcher bond d) Bricks layer aligned such that vertical joint is continuous

A

only a

B

only c

C

both a & b

D

both c & d

Consider the following statements: 1. If more water is added to concrete for increasing its workability, it results into concrete of low strength. 2. No slump is an indication of a good workable concrete. 3. Higher the slump of concrete, lower will be its workability. 4. Workability of concrete is affected by water content as well as water-cement ratio. Which of the above statements are correct?

A

1 and 3 only

B

2 and 3 only

C

1 and 4 only

D

2 and 4 only

In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab
ii) the heel slab is designed as a continuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

What maximum thickness of concrete can be poured without causing the temperature gradient to exceed 98.5 degree Celsius per meter anywhere in the slab? Consider a 1.2 m thick slab of poured concrete (k = 1.148 W/m degree) with both of side surfaces maintained at a temperature of 20 degree Celsius. During its curing, chemical energy is released at the rate of 80 W/m3. Workout the maximum temperature of concrete

A

2.64 m

B

3.64 m

C

4.64 m

D

5.64 m

Consider the following statements related to the advantages of concrete sleepers : 1. Concrete sleepers can generally be mass-produced using local resources. 2. Concrete sleepers are not suitable for better packing. 3. Concrete sleepers have a very long life span. 4. Concrete sleepers have no scrap value. Which of the above statements is/are correct?

A

1 only

B

1 and 3 only

C

2 only

D

2 and 4 only

Flexible pavement	Rigid Pavement
The load is transferred from top to bottom by grain to grain contact.	The load is transferred through slab action
Low or negligible flexural strength.	High flexural strength.
Joints are absent.	Expansion and contraction joints are provided
Low initial cost but high maintenance cost.	High Initial cost but low maintenance cost.
It includes- Surface, base, sub-base, and subgrade layers.	It includes – Concrete slab, base course, and subgrade layers.
Deformation in the top layers is transferred to under- laid layers	Deformation is only in the top layer of the concrete slab.
More suitable for stage construction	Less Suitable for stage construction.
Very less effect of temperature stress.	Effected by temperature and frictional stresses.

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