Related Questions

When an iron nail gets rusted, iron oxide is formed
A Without any change in the weight of the nail
B With decrease in the weight of the nail
C With increase in the weight of the nail
D Without any change in colour or weight of the nail
নিম্নের কোন oxide টিকে উভধর্মী oxide বলে?
A CaO
B MgO
C ZnO
D CuO
Which metal oxide is an amphoteric oxide?
A iron
B aluminium
C sodium
D potassium
Among the following iron ores, the highest percentage of iron content is found in–
A Haemetite
B Magnetite
C Limnonite
D None of these
Iron content in Indian iron ore is about __________ percent.
A 80-85
B 60-65
C 40-45
D 20-25
Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
A Quick setting cement
B Rapid hardening cement
C White cement
D Low heat Portland cement
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A Beryllia
B Zirconia
C Alumina
D Magnesia
If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in
A liquid state
B plastic state
C semi-solid state
D solid state
Moisture content in the soil _______ the earth soil resistance
A increase
B decrease
C does not affect
D none of the above
The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called
A hygroscopic water
B equivalent moisture
C soil moisture deficiency
D pellicular water

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