Question: Maximum permissible sulphur content in steel is ______________ percent?

• 1. 0.015
• 2. 0.055
• 3. 0.505
• 4. 0.805

Question: Maximum consumption of lead is in the manufacture of _________________________?

• 1. Storage batteries
• 2. Solder alloys
• 3. Electric cable sheathing
• 4. Lead lined vessels

Question: Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?

• 1. Ultimate tensile strength (U.T.S.)
• 2. Endurance limit
• 3. Elastic limit
• 4. None of these

Question: Cast iron is having very high ___________________?

• 1. Proximity between its elastic limit and ultimate breaking strength
• 2. Ductility
• 3. Tensile strength
• 4. All A, B & C

Question: The crystal structure of most of the common metals is_____________________?

• 1. Orthorhombic
• 2. Cubic
• 3. Hexagonal
• 4. None of these

Question: Spark plugs are made of______________________?

• 1. High alumina ceramic
• 2. Metallic carbides
• 3. Corundum
• 4. Carborundum

Question: In cold working of metal as compared to its hot working____________________?

• 1. Cracks and blow holes are eliminated
• 2. Ductility and impact strength improves
• 3. Appreciable strain hardening is produced
• 4. Yield stress, hardness and fatigue strength is not at all affected

Question: ‘Age hardening’ of duralumin is due to____________________?

• 1. Copper
• 2. Magnesium
• 3. Both A & B
• 4. Neither A nor B

Question: The softest material just next to talc in the Mho’s scale is___________________?

• 1. Quartz
• 2. Gypsum
• 3. Feldspar
• 4. Fluorite

Question: Which of the following comprises of hydrocarbons ?

• 1. Mica flakes
• 2. Glass
• 3. Rubber
• 4. None of these