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.Management Sciences
Category: Materials and Construction
The softest material just next to talc in the Mhos scale is_________________?
A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite
For spinning viscose rayon, the extrusion spinnerettes are made of ___________________?
A. Platinum or gold alloys
B. High carbon steel
C. Aluminium
D. Nickel
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 lattice structure
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
A chemical change takes place when iron_____________?
A. Rusts
B. Melts
C. Is heated
D. None of these
Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by_________________?
A. Dilute HCI
B. Acetic acid
C. Concentrated H2SO4
D. None of these
Cast iron detachable joint is used in __________ pipes.
A. Steel
B. Cast iron
C. Asbestos cement
D. Reinforced cement concrete
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
Invar used in thermocouples is an alloy of nickel and________________?
A. Iron
B. Copper
C. Chromium
D. Lead
Aluminium storage vessel can be used to store________________?
A. Aqua regia
B. Ferrous sulphate
C. Hydrochloric acid (10%)
D. None of these
Ceramic materials are____________________?
A. Organic in nature
B. Stronger in compression than in tension
C. Always amorphous in nature
D. Always bad heat conductors
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