MATERIAL - ENGINEERING CONCEPTS

Choose the correct option indicating the evolution of construction materials and methods

• Masonry -> Plain cement concrete -> Reinforced cement concrete - > Wood

• Wood -> Plain cement concrete -> Reinforced cement concrete - > Masonry

• Masonry -> Plain cement concrete -> Reinforced cement concrete - > Composite construction

• Monolithic construction -> Plain cement concrete -> Reinforced cement concrete -> Masonry

State true of false

The variability in the material strength is relatively less for concrete in comparison with that of steel

• True

• False

State true of false

For the same axial design load, the cross-sectional area of typically brick columns is generally more than that of the reinforced concrete columns

• True

• False

Pyramids are example of ________ masonry

• Interlock

• Random rubble

• Dry stack

• Reinforced

Which of the following was/were used as mortars in the past?

• Bitumen

• Lime

• Aluminium

• Gypsum

Match the material listed in column A with their corresponding level of information listed in column B

• a - i, b - iii, c - ii

• a - iii, b - i, c - ii

• a - iii, b - ii, c - i

• a - ii, b - i, c - iii

The concrete used in arches and domes is in a state of _________

• tension

• compression

• both tension and compression

• none of these

Which of the following is the correct increasing order of density?

• Epoxy resin < Concrete < Diamond < Structural steel

• Epoxy resin < Concrete <Structural steel < Diamond

• Diamond < Concrete <Structural steel < Epoxy resin

• Concrete <Structural steel < Diamond < Epoxy resin

In a residential building, all the columns are built using concrete with characteristic compressive strength of 40MPa. What would have been the targeted average compressive strength of the concrete, when it was designed if 5% failure rate is acceptable?

• 31.8 N/mm2

• 48.2 N/mm2

• 40 N/mm2

• 42 N/mm2

Figure shows the stress-strain behaviour of three different materials A, B and C. Which among the following is/are true regarding the propeereties of these materials?

• A has highest ductility among A, B and C

• C is less brittle than A and B

• C is most ductile material among A, B and C

• B has higher modulus of elasticity than A