D41 CHECK YOUR LEVEL

Match the following cement compounds with their properties:

• C3S – Early Strength, C2S – Long-term Strength, C3A – High Heat of Hydration, C4AF – Colour
• C3S – Long-term Strength, C2S – Early Strength, C3A – Low Heat, C4AF – Strength
• C3S – High Strength, C2S – Colour, C3A – Early Strength, C4AF – Heat
• C3S – Heat, C2S – Colour, C3A – Long-term Strength, C4AF – Early Strength

Answer explanation

C3S contributes to early strength, C2S gives progressive strength, C3A generates high heat, and C4AF imparts color.

A reservoir has gross storage of 5 million m³, dead storage of 0.5 million m³, and valley storage of 0.2 million m³. What is the effective storage?

• 4.3 million m³
• 5.7 million m³
• 4.5 million m³
• 5.0 million m³

Answer explanation

Effective storage = Gross - Dead - Valley = 5 - 0.5 - 0.2 = 4.3 million m³.

Which component of cement imparts quick setting property?

• Silica
• Alumina
• Magnesia
• Calcium Sulphate

Answer explanation

Alumina contributes to quick setting property of cement.

Which is used to measure very small pressures?

• Torr
• Bar
• Pascal
• Atmosphere

Answer explanation

Torr is commonly used to express very small pressures.

Design Hourly Traffic Volume is defined as:

• The average hourly traffic volume
• The highest hourly volume on a day
• The 30th highest hourly volume in a year
• The peak hour volume of a month

Answer explanation

DHTV is the 30th highest hourly volume in a year used for design.

The minimum cover for RCC columns as per IS code is:

• 15 mm
• 25 mm
• 40 mm
• 50 mm

Answer explanation

Minimum cover for columns is 40 mm or diameter of bar, whichever is more.

Which reservoir type is associated with urban water supply systems?

• Detention reservoir
• Retarding reservoir
• Distribution reservoir
• Flood control reservoir

Answer explanation

Distribution reservoirs store water for peak demands in urban water supply systems.

Which of the following cement types is suitable for marine construction?

• White Cement
• Rapid Hardening Cement
• Pozzolana Cement
• Sulphate Resistant Cement

Answer explanation

Sulphate Resistant Cement resists alkaline water attack, ideal for marine structures.

Hydrophobic cement is characterized by:

• Increased permeability
• Decreased wetting ability
• Rapid setting
• Reduced curing period

Answer explanation

Hydrophobic cement contains admixtures that reduce water absorption.

What is the relation given by the perpendicular axis theorem?

• Ixx = Iyy + Izz
• Izz = Ixx + Iyy
• Izz = Ixx - Iyy
• Iyy = Izz - Ixx

Answer explanation

Perpendicular axis theorem: Izz = Ixx + Iyy for planar sections.