Question: The transistor is made of___________________?

• 1. silver
• 2. gold
• 3. copper
• 4. germanium

Question: Following elements have face-centred cubic structure__________________?

• 1. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
• 2. Mg, Zn, Ti, Zr, Br, Cd
• 3. a iron (below 910°C and between 1400 to 1539°C), W
• 4. all of the above

Question: Acidic solution is one which has pH value__________________?

• 1. greater than 7
• 2. less than 7
• 3. equal to 7
• 4. pH value has nothing to do with neutral solution

Question: Babbit metal is a_________________?

• 1. lead base alloy
• 2. tin base alloy
• 3. copper base alloy
• 4. A and C above

Question: Age-hardening is related with______________?

• 1. stainless steel
• 2. gun metal
• 3. german silver
• 4. duralumin

Question: Dow metal contains____________________?

• 1. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
• 2. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
• 3. 90% aluminium and 90% copper
• 4. 90% magnesium and 9% aluminium with some copper

Question: German silver contains_________________?

• 1. 1% silver
• 2. 2.5% silver
• 3. 5% silver
• 4. 10% silver

Question: Constantant an alloy used in thermocouples is an alloy of __________________?

• 1. copper and tin
• 2. copper and zinc
• 3. copper and iron
• 4. copper and nickel

Question: Addition of lead and bismuth to aluminium results in_________________?

• 1. improvement of casting characteristics
• 2. improvement of corrosion resistance
• 3. one of the best known age and precipitation-hardening systems
• 4. improving machinability

Question: Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________?

• 1. iron
• 2. copper
• 3. aluminium
• 4. nickel