D63 QUIZ OF THE DAY

Which grade of cement is most suitable for RCC members subjected to high tensile stress?

• 33 Grade OPC
• 53 Grade OPC
• 43 Grade OPC
• PPC

Answer explanation

53 Grade OPC is used where high early strength and high tensile stress resistance is needed.

What is the typical pH range of water used for RCC works as per IS standards?

• 5–7
• 7–9
• 3–5
• 6–8

Answer explanation

IS standards specify the pH of water for concrete should be between 6 and 8.

Which IS code relates to the specification for OPC cement?

• IS 383
• IS 269
• IS 432
• IS 456

Answer explanation

IS 269 is the standard code for Ordinary Portland Cement (OPC).

Which reinforcement bar type provides 40% more bond strength compared to plain bars?

• Deformed Bars
• Round Bars
• TMT Bars
• Mild Steel Bars

Answer explanation

Deformed bars provide higher bond strength due to their ribbed surface.

What is the permissible tensile stress in Fe 415 HYSD bars?

• 200 N/mm²
• 230 N/mm²
• 250 N/mm²
• 275 N/mm²

Answer explanation

Fe 415 HYSD bars have permissible tensile stress of 230 N/mm² as per IS:456.

Which type of beam has both ends fixed in walls or columns?

• Simply supported beam
• Cantilever beam
• Overhanging beam
• Fixed beam

Answer explanation

A fixed beam is one whose both ends are rigidly built into supports.

What is the minimum concrete grade to be used in RCC?

• M10
• M5
• M15
• M20

Answer explanation

Grades lower than M15 should not be used in RCC as per IS standards.

Twisting of bars leads to:

• Decrease in tensile strength
• Reduction in bond strength
• Increase in elongation
• Considerable increase in yield strength

Answer explanation

Twisting bars improves yield strength and is a method for making high strength bars.

What is the permissible tensile stress of Fe 500 HYSD bars?

• 300 N/mm²
• 230 N/mm²
• 250 N/mm²
• 275 N/mm²

Answer explanation

Fe 500 HYSD bars have a permissible tensile stress of 275 N/mm².

Which code is referred for aggregate specification in RCC?

• IS 456
• IS 269
• IS 432
• IS 383

Answer explanation

IS 383 specifies quality of fine and coarse aggregates for concrete.