Practice Pakistan's most useful MCQs for competitive exams

Glass is corroded by________________?

• (A)  Fluorine (dry or wet)
• (B)  Sulphuric acid
• (C)  Phosphoric acid
• (D)  None of these

Answer

Submitted By :Ali Uppal

Nickel base alloys with ______________ are known as monel metal?

• (A)  Zinc
• (B)  Tin
• (C)  Copper
• (D)  Molybdenum

Answer

Submitted By :Ali Uppal

How many atoms are there per unit cell in a body centred cubic lattice system ?

• (A)  6
• (B)  5
• (C)  3
• (D)  2

Answer

Submitted By :Ali Uppal

Bush bearings are made of______________________?

• (A)  Mild steel
• (B)  Phosphorous bronze
• (C)  White metal alloys
• (D)  None of these

Answer

Submitted By :Ali Uppal

Presence of cobalt in steel improves its____________________?

• (A)  Cutting ability
• (B)  Corrosion resistance
• (C)  Tensile strength
• (D)  None of these

Answer

Submitted By :Ali Uppal

A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?

• (A)  5
• (B)  100
• (C)  250
• (D)  500

Answer

Submitted By :Ali Uppal

Wrought iron is having very high ________________?

• (A)  Hardness
• (B)  Strength
• (C)  Corrosion resistance
• (D)  Susceptibility to changes in its properties by heat treatment

Answer

Submitted By :Ali Uppal

As the impurities are oxidised, the melting point of iron___________________?

• (A)  Decreases
• (B)  Remains unchanged
• (C)  Increases
• (D)  May increase or decrease; unpredictable

Answer

Submitted By :Ali Uppal

Nitriding of steel is a process for________________?

• (A)  Case hardening
• (B)  Spheroidising
• (C)  Normalising
• (D)  Annealing

Answer

Submitted By :Ali Uppal

German silver is an alloy of copper, nickel and________________?

• (A)  Zinc
• (B)  Silver
• (C)  Tin
• (D)  Lead

Answer

Submitted By :Ali Uppal