Practice Pakistan's most useful MCQs for competitive exams

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) ?

• (A)  √T
• (B)  1/√P
• (C)  √y
• (D)  1/√ρ

Answer

Submitted By :Ali Uppal

Hot & cold working of material causes its _______________ deformation?

• (A)  Visco-elastic
• (B)  Isotropic
• (C)  Elastic
• (D)  Plastic

Answer

Submitted By :Ali Uppal

Thermit welding is categorised as the ______________________ welding ?

• (A)  Forge
• (B)  Fusion
• (C)  Resistance
• (D)  Arc

Answer

Submitted By :Ali Uppal

Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and ___________________?

• (A)  Manganese
• (B)  Silicon
• (C)  Nickel
• (D)  Chromium

Answer

Submitted By :Ali Uppal

As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the _____________ joint ?

• (A)  Butt
• (B)  Lap
• (C)  Welded
• (D)  None of these

Answer

Submitted By :Ali Uppal

Often earing defects are found during deep drawing operation, because the __________________?

• (A)  Surface finish of the sheet is poor
• (B)  Sheet material has been given substantial spring back
• (C)  Starting sheet has planer anisotropy due to its texture
• (D)  Starting sheet has normal anisotropy due to its texture

Answer

Submitted By :Ali Uppal

Plants produce carbohydrates from the CO2 present in the atmosphere by_________________?

• (A)  Polymerisation
• (B)  Photochemical reaction
• (C)  Oxidation
• (D)  None of these

Answer

Submitted By :Ali Uppal

_______________ is not a case hardening process ?

• (A)  Carburising
• (B)  Nitriding
• (C)  Cyaniding
• (D)  Annealing

Answer

Submitted By :Ali Uppal

Calorific value of ____________________ are almost same?

• (A)  Lignite & anthracite coal
• (B)  Lignite & coal gas
• (C)  Petrol & diesel
• (D)  Coal gas & natural gas

Answer

Submitted By :Ali Uppal

Identify the correct statement with reference to the extractive metallurgy of aluminium ?

• (A)  The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
• (B)  Approximately 80% of the aluminium deposited on the cathode comes from cryolite
• (C)  Sodium is deposited along with aluminium, but is immediately vaporised
• (D)  Anode effect sets in when the cryolite concentration goes below 40%.

Answer

Submitted By :Ali Uppal