Free Printable unit 3 Act English

Free Printable Worksheets

Worksheets

unit 3 Act English

Total questions: 20

Worksheet time: 10mins

Name

Class

Date

1.

Durability of concrete refers to its ability to

a)

Gain early strength

b)

Resist deterioration

c)

Increase workability

d)

Reduce cost

2.

Durable concrete should retain its

a)

Colour

b)

Weight

c)

Form and serviceability

d)

Cement content

3.

Increased cement content mainly increases

a)

Creep

b)

Shrinkage

c)

Permeability

d)

Strength only

4.

Structural cracks mainly affect

a)

Appearance

b)

Durability only

c)

Safety and integrity

d)

Colour

5.

Non-structural cracks are caused mainly due to

a)

Overloading

b)

Faulty design

c)

Internal stresses

d)

Settlement

6.

Provision of more steel reinforcement in concrete

a)

Eliminates cracks

b)

Converts big cracks to smaller cracks

c)

Improves durability

d)

Stops corrosion

7.

Plastic shrinkage cracks occur when

a)

Concrete is hardened

b)

Evaporation exceeds bleeding

c)

Cement content is low

d)

Temperature is low

8.

Plastic shrinkage depends on

a)

Cement type

b)

Wind velocity

c)

Relative humidity

d)

All the above

9.

Plastic shrinkage cracks occur in

a)

Hardened concrete

b)

Plastic stage

c)

Fully cured concrete

d)

Old concrete

10.

Bleeding is defined as

a)

Loss of cement

b)

Upward movement of water

c)

Settlement of aggregate

d)

Evaporation of water

11.

Shrinkage increases with increase in

a)

Aggregate size

b)

Cement content

c)

Strength

d)

Curing

12.

Lower W/C ratio concrete

a)

Shrinks more

b)

Is weaker

c)

Resists shrinkage

d)

Bleeds more

13.

Drying shrinkage mainly occurs due to

a)

Hydration

b)

Loss of moisture

c)

Chemical reaction

d)

Freezing

14.

Microcracks caused by shrinkage lead to

a)

Strength gain

b)

Reduced permeability

c)

Increased permeability

d)

Better bonding

15.

Galvanizing protects steel by coating with

a)

Copper

b)

Aluminium

c)

Zinc

d)

Nickel

16.

Whitish appearance on concrete indicates

a)

Carbonation

b)

Efflorescence

c)

Sulphate attack

d)

Corrosion

17.

Ettringite formation causes

a)

Volume reduction

b)

Volume increase

c)

Strength gain

d)

Permeability reduction

18.

Carbonation is reaction between

a)

CO₂ and cement

b)

CO₂ and Ca(OH)₂

c)

Oxygen and steel

d)

Chloride and steel

19.

Corrosion of steel in concrete is

a)

Physical process

b)

Chemical process

c)

Electrochemical process

d)

Mechanical process

20.

Corrosion causes

a)

Strength increase

b)

Spalling of concrete

c)

Reduced permeability

d)

Better bonding

100 %

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