Materials & Construction Mcqs for Chemical - Set 10

1)   Alpha iron is stable ______________ °C?

a. Above 1403
b. Upto 910
c. Above 1800
d. Between 910 & 1403
Answer  Explanation 

ANSWER: Upto 910

Explanation:
No explanation is available for this question!


2)   The softest material in Mho’s scale (for measuring hardness) is________________?

a. Talc
b. Gypsum
c. Rubber
d. None of these
Answer  Explanation 

ANSWER: Talc

Explanation:
No explanation is available for this question!


3)   Cold work tool steel should have_________________?

a. High toughness
b. Poor hardenability
c. High wear resistance
d. All A., B. & C.
Answer  Explanation 

ANSWER: High wear resistance

Explanation:
No explanation is available for this question!


4)   Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium_______________?

a. Tin, nickel, iron and chromium
b. And graphite
c. And copper
d. None of these
Answer  Explanation 

ANSWER: Tin, nickel, iron and chromium

Explanation:
No explanation is available for this question!


5)   An alloy of iron containing 4% carbon is called________________?

a. High carbon steel
b. Wrought iron
c. Mild steel
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!


6)   _____________ is used for examining the macro-structure of a material?

a. Metallurgical microscope
b. Optical microscope
c. X-rays
d. Visual inspection by naked eye
Answer  Explanation 

ANSWER: Visual inspection by naked eye

Explanation:
No explanation is available for this question!


7)   Acetaldehyde is shipped in ____________ drums?

a. Cast iron
b. Steel
c. Aluminium
d. Either B. & C.
Answer  Explanation 

ANSWER: Either B. & C.

Explanation:
No explanation is available for this question!


8)   Rotary driers are generally made of_______________?

a. Cast iron
b. Mild steel
c. High silicon iron (14% Si)
d. Tin lined with refractory bricks
Answer  Explanation 

ANSWER: Mild steel

Explanation:
No explanation is available for this question!


9)   Fatigue failure of a material may occur, when it is subjected to _____________ stress?

a. Fluctuating
b. Tensile
c. Compressive
d. Torsion
Answer  Explanation 

ANSWER: Fluctuating

Explanation:
No explanation is available for this question!


10)   Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ?

a. Silicon
b. Phosphorus
c. Sulphur
d. None of these
Answer  Explanation 

ANSWER: Silicon

Explanation:
No explanation is available for this question!


11)   Ball bearings are generally made of___________________?

a. Plain carbon steel
b. Chrome carbon steel
c. Stainless steel
d. Malleable cast iron
Answer  Explanation 

ANSWER: Chrome carbon steel

Explanation:
No explanation is available for this question!


12)   Hardest materials so far found is_________________?

a. Diamond
b. Graphite
c. Carborundum
d. Pumice stone
Answer  Explanation 

ANSWER: Diamond

Explanation:
No explanation is available for this question!


13)   The presence of impurities in iron_________________?

a. Increases its melting point
b. Does not affect its melting point
c. Decreases its melting point
d. Makes it malleable
Answer  Explanation 

ANSWER: Decreases its melting point

Explanation:
No explanation is available for this question!


14)   Molybdenum steels containing 0.15 to 0.40% molybdenum___________________?

a. Are prone to temper brittleness
b. Are used for automobile parts like gears, axle, shaft, bearings etc.
c. Have very poor fatigue resistance
d. Do not contain nickel or chromium or both
Answer  Explanation 

ANSWER: Are used for automobile parts like gears, axle, shaft, bearings etc.

Explanation:
No explanation is available for this question!


15)   Carbon is present in the uncombined (graphitic) form in case of__________________?

a. Cast iron
b. Steel
c. Ferroalloy
d. None of these
Answer  Explanation 

ANSWER: Cast iron

Explanation:
No explanation is available for this question!


16)   Nickel and molybdenum are the basic constituents of___________________?

a. Hastelloy
b. German silver
c. Inconel
d. Solder
Answer  Explanation 

ANSWER: Hastelloy

Explanation:
No explanation is available for this question!


17)   
Constantan used in thermocouples is an alloy of___________________?


a. Iron & copper
b. Copper & aluminium
c. Lead & tin
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!


18)   Tempering of steel is done to make it_________________?

a. Brittle
b. Hard
c. Rollable
d. Soft
Answer  Explanation 

ANSWER: Soft

Explanation:
No explanation is available for this question!


19)   Hydrochloric acid absorber in made of___________________?

a. Cast iron
b. Mild steel
c. Karbate
d. Stainless steel
Answer  Explanation 

ANSWER: Karbate

Explanation:
No explanation is available for this question!


20)   Most suitable material for high pressure vessel operating at 500 atm. and 500° C is__________________?

a. Molybdenum stainless steel
b. 18/8 stainless steel
c. Mild steel
d. High silicon iron (14% Si)
Answer  Explanation 

ANSWER: Molybdenum stainless steel

Explanation:
No explanation is available for this question!


21)   Metalloid is__________________?

a. Highly electronegative in nature
b. An element which exhibits the properties of both metal & non-metal
c. An alloy
d. All A., B. and C.
Answer  Explanation 

ANSWER: An element which exhibits the properties of both metal & non-metal

Explanation:
No explanation is available for this question!


22)   The ability of a material to offer resistance to scratching or indentation is a measure of its_________________?

a. Brittleness
b. Toughness
c. Hardness
d. Resilience
Answer  Explanation 

ANSWER: Hardness

Explanation:
No explanation is available for this question!


23)   In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of _______________?

a. Concrete
b. Wood
c. Steel
d. Porcelain
Answer  Explanation 

ANSWER: Steel

Explanation:
No explanation is available for this question!


24)   A magnetic material becomes ____________ above the Curie temperature?

a. Ferromagnetic
b. Diamagnetic
c. Paramagnetic
d. None of these
Answer  Explanation 

ANSWER: Paramagnetic

Explanation:
No explanation is available for this question!


25)   Common house hold glass (i.e., soda-lime glass) is a/an _____________ material?

a. Fully crystalline
b. Partly crystalline
c. Amorphous
d. None of these
Answer  Explanation 

ANSWER: Partly crystalline

Explanation:
No explanation is available for this question!


26)   Carbon content in plain carbon steel is ______________ percent?

a. 0.1 to 0.15
b. 0.35 to 0.45
c. 0.65 to 0.80
d. 0.85 to 1.2
Answer  Explanation 

ANSWER: 0.35 to 0.45

Explanation:
No explanation is available for this question!


27)   For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is__________________?

a. Stainless steel
b. Cast iron
c. Aluminium
d. Nickel
Answer  Explanation 

ANSWER: Cast iron

Explanation:
No explanation is available for this question!


28)   Coke oven walls are lined with _____________ bricks?

a. Silica
b. Tar-dolomite
c. Low thermal conductivity
d. Fire clay
Answer  Explanation 

ANSWER: Silica

Explanation:
No explanation is available for this question!


29)   Pick out the wrong statement?

a. Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure
b. Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal l
c. Tungsten has a body centred cubic (bcc) crystal lattice structure
d. Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
Answer  Explanation 

ANSWER: Tungsten has a body centred cubic (bcc) crystal lattice structure

Explanation:
No explanation is available for this question!


30)   Metal at the top of the electromotive series is________________?

a. Least active
b. Most stable
c. Most active
d. Most noble
Answer  Explanation 

ANSWER: Most active

Explanation:
No explanation is available for this question!