Related Questions

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.
A Zinc
B Mercury
C Lead
D Tin
The metallic sheath may be made of lead or lead alloy or of aluminum.
A Yes
B No
The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by
A Electrolysis
B Electrolytic reduction
C Electrolytic oxidation
D None of these
Perminvar alloy having constant permeability is an alloy of
A Nickel, copper and iron
B Nickel, copper and zinc
C Copper, nickel and antimony
D Iron, zinc and bismuth
The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.
A Less than
B Equal to
C More than
D Either B or C; depends on the type of alloy
Constantan an alloy used in thermocouples is an alloy of
A Copper and tin
B Copper and zinc
C Copper and iron
D Copper and nickel
In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is
A Independent of temperature
B Increases with rise in pressure
C Increased with decrease in pressure
D Unchanged with pressure changes
In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
A Independent of the temperature
B Increased with the increase in pressure
C Decreased with the increase in pressure
D Unchanged by the pressure change
Ceramic compounds as compared to metallic compounds
A Crystallise faster
B Resist greater tensile stress at room temperature
C Have higher melting temperature
D Are better conductor of electricity at higher temperature

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