CAT TWO ONLINE BUILDING/CONSTRUCTION MATERIAL SCIENCE

1. 1. Which of the following raw materials is NOT commonly used in the manufacture of structural clay products?

• • A. Quartz

• • B) Sand

• C) CHAMATTE

• D)LIMESTONE

2. 2. Which of the following is a primary characteristic of structural clay products?2.

• • A) High thermal conductivity

• • B) Low water absorption

• • C) Flexibility

• • D) High compressive strength

3. 3. What is the main purpose of using additives in the production of structural clay products?

• • B) To improve workability

• • C) To reduce weight

• • A) To enhance color

• • D) To increase porosity

Which of the following processes is essential in the manufacturing of structural clay products?

• • D) Extrusion

• • C) Casting

• • A) Sintering

• • B) Melting

What is the effect of increasing bulk specific gravity in non-vitrified clay products?

• Correct Answer: B) Stronger the clay product

• • A) Weaker the clay product

• • B) Stronger the clay product

• • C) No change in strength

• • D) Reduced porosity

Which material is added to clay to prevent shrinkage and warping during the manufacturing process?

• • A) Alumina

• • B) Lime

• • C) Silica

• • D) Magnesia

Which type of brick is specially made or selected to have an attractive appearance when used without rendering or plaster?

• • A) Common brick

• • B) Facing brick

• • C) Engineering brick

• • D) Ordinary brick

What is the main purpose of adding lime to clay during the manufacturing of bricks?

• A) To increase plasticity

• Correct Answer: B) To reduce shrinkage on drying

• • A) To increase plasticity

• • B) To reduce shrinkage on drying

• • C) To impart red colour

• • D) To soften the clay

What property does iron oxide impart to clay when burned with excess oxygen?

• Correct Answer: C) Red color

• • A) Dark brown color

• • B) Yellow color

• • C) Red color

• • D) Black color

Which one of the following is not a class of concrete?

• CLASS 20

• CLASS 15

• CLASS 16

• CLASS 25