Practice Pakistan's most useful MCQs for competitive exams

The following thermocouple may be used for measuring temperature upto 1873°K__________________?

• (A)  Chromel-alumel
• (B)  Copper-constantan
• (C)  Platinum-platinum rhodium
• (D)  Iron-constantan

Answer

Submitted By :Ali Uppal

Drossing is a _______________________ operation?

• (A)  Smelting
• (B)  Dressing
• (C)  Roasting
• (D)  Dressing

Answer

Submitted By :Ali Uppal

Lead pencil contains____________________?

• (A)  Graphite
• (B)  Lead sulphide
• (C)  Lead
• (D)  Both

Answer

Submitted By :Ali Uppal

Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?

• (A)  Galvanising
• (B)  Tinning
• (C)  Sherardizing
• (D)  None of these

Answer

Submitted By :Ali Uppal

The underground well of a bio gas plant is called the________________?

• (A)  Septic tank
• (B)  Oxidation well
• (C)  Digestor
• (D)  Lagoon

Answer

Submitted By :Ali Uppal

A fire tube boiler is limited to a maximum steam pressure of about ______________ kg/cm2 ?

• (A)  6
• (B)  18
• (C)  38
• (D)  52

Answer

Submitted By :Ali Uppal

Water hammer is caused in steam carrying pipelines, because of ______________________?

• (A)  Partial condensation of steam
• (B)  Vibration of the pipeline
• (C)  High degree of superheat of steam
• (D)  Its exposure to torrential rain

Answer

Submitted By :Ali Uppal

The mechanism involved in the removal of metal in drilling operation is by_________________?

• (A)  Compression
• (B)  Extrusion
• (C)  Shearing
• (D)  Both B & C

Answer

Submitted By :Ali Uppal

Out of the following _______________ iron has the best capability to bear sudden & excessive shocks?

• (A)  White
• (B)  Cast
• (C)  Wrought
• (D)  Pig

Answer

Submitted By :Ali Uppal

Which one is neutral in character ?

• (A)  N2O4
• (B)  N2O
• (C)  N2O5
• (D)  N2O3

Answer

Submitted By :Ali Uppal