set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on metals, non metals, minerals, ores, properties, uses topic of general science mcq
(a) Uranium
(b) Aluminium
(c) Copper
(d) Silver
The correct answers to the above question in:
Answer: (a)
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Question : 1
Which of the following is not an ore?
a) Zinc blende
b) Bauxite
c) Malachite
d) Pig iron
Answer »Answer: (d)
Pig iron ⟶ It is the most impure form of iron and contains the highest proportion of carbon (2.5–4%).
Rest all are ore.
Malachite ⟶ Cu(OH)2 CuCO3,
Zinc blende ⟶ ZnS, Bauxite ⟶ Al2O3 2H2O
Question : 3
These days yellow lamps are frequently used as street light. Which one of the following is used in these lamps?
a) Neon
b) Hydrogen
c) Sodium
d) Nitrogen
Answer »Answer: (c)
Question : 4
Which of the following statement regarding non-metals is true?
a) Non-metals are non-lustrous with dull apppearence. Graphite, an allotrope of carbon and iodine have shining lustrous surfaces.
b) Non-metals are of two types only solids and gases.
c) Non-metals reacts with oxygen to form basic oxides generally.
d) Non-metals replace hydrogen from acids.
Answer »Answer: (a)
Question : 5
Which of the following have low melting and boiling points?
a) Iron
b) Phosphorus
c) Sodium
d) Both (b) and (c)
Answer »Answer: (d)
Phosphorus is a non-metal and non-metals have low melting and boiling points.
Although sodium is a metal, it has low melting and boiling point.
Question : 6
Pure gold is –
a) 20 carats
b) 24 carats
c) 22 carats
d) 18 carats
Answer »Answer: (b)
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