D70 FACE THE CHALLENGE

In standard penetration test (SPT), the number of blows for the last 300 mm penetration is referred to as:

• N-value
• SPT index
• Resistance factor
• Bearing ratio

Answer explanation

The N-value in SPT is the number of blows required for the last 300 mm of penetration.

In cabinet projection, the ratio of receding axis length to true length is:

• 1:1
• 1:2
• 2:1
• 3:4

Answer explanation

Cabinet projection uses receding lines at half the true length (1:2 ratio) to reduce distortion.

Which rock type contains mainly carbonate of lime and is used for flooring?

• Marble
• Quartzite
• Slate
• Granite

Answer explanation

Marble contains carbonate of lime and is valued for its appearance and polish.

Silica-rich stones are classified as:

• Argillaceous
• Calcareous
• Silicious
• Igneous

Answer explanation

Silicious stones contain silica as the major component; examples include granite and quartzite.

In cabinet projection, receding lines are generally inclined at:

• 30°
• 45°
• 60°
• 90°

Answer explanation

Cabinet projection uses 45° inclination for receding lines.

Attrition test is conducted on stones to find:

• Toughness
• Hardness
• Wear resistance
• Acid resistance

Answer explanation

Attrition test measures the wear resistance of stones.

French curves are made of:

• Wood
• Metal
• Plastic
• Rubber

Answer explanation

French curves are usually made of transparent plastic for easy drawing.

Flexible curves are enclosed in a sheath of:

• Rubber
• Plastic
• Steel
• Wood

Answer explanation

Flexible curves have a lead core enclosed in a rubber sheath.

Columns with slenderness ratio more than 120 are classified as:

• Short
• Medium
• Long
• Very long

Answer explanation

Columns with slenderness ratio >120 are classified as long columns.

In oblique projection, the angle between receding axis and horizontal is commonly:

• 15°
• 30°
• 45°
• 60°

Answer explanation

45° inclination is standard in oblique projections for simplicity.