The poorest conductor of heat among metals is

• Lead

• Mercury

• Calcium

• Sodium

The most abundant metal in the earth’s crust is

• Iron

• Alluminium

• Calcium

• Sodium

Which of the following is the purest form of iron?

• Cast Iron

• Wrought Iron

• Mild Steel

• High Carbon Steel

As a natural material timber is an

• Isotropic material.

• Heterogeneous material.

• Homogeneous material.

• None of these

What are NOT ingredients of Good Brick Earth

• Silica

• Alumina

• Lime

• Carbon

Hygroscopicity is the property of a material to absorb

• Carbon Dioxide from air

• Oxygen from Air

• Water Vapour from air

• Heat from air

Hardness of Materials is a

• Physical Property

• Chemical Property

• Mechanical Property

• Electrical Property

When a material is pulled in tension, it exhibits the reduction in compressive strength.

• True

• False

Which machine is used to measure compressive strength?

• Erichsen machine

• Universal testing machine

• Impact testing machine

• Fatigue testing machine

Consider the following with regards to burning of clay bricks.

• The clay loses its plasticity

• Carbonate minerals are decarbonated

• Some of the carbonaceous matter is burnt

• Clay mass is converted into glass like substance

• Ferrous iron is oxidized to ferric form