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What is the relation between cube strength of concrete and cylinderical strength of concrete?

Cylinderical strength of concrete is 0.8 times of cube strength of concrete.

Q4: In Fe415 & Fe500,What is mean by "Fe" and "415/500"?
A4: Fe indicates Ferrous
415 / 500 indicates the Tensile strength of the Steel.

For example - Fe415 steel will have a strenth of 415 N/ mm2

Q3: What are the dimensions of Standard Brick and Nominal bricks?
A3: Standard size of brick 19cm * 19cm * 9cm
Nominal size of brick 20cm * 10cm * 10cm
(Nominal size is includes thickness of mortar)

Q2: what is the density of steel?
7850 kg/m3

What are the units of strain?
Strain does'nt have any unit because
strain =(change in length) / (original length)
denominator unit is metre and numerator also metre . so gets cancelled.

Specifically about strain, it says:
"Strain is defined as the amount of deformation an object experiences compared to its original size and shape. For example, if a block 10 cm on a side is deformed so that it becomes 9 cm long, the strain is (10-9)/10 or 0.1 (sometimes expressed in percent, in this case 10 percent.) Note that strain is dimensionless." Thus, no specific units

Cwillbook Platform for civil engingineering students and professionals to share their interview questions

What are the units of strain?

Cwillbook Platform for civil engingineering students and professionals to share their interview questions