Question : Which of the following elements is highly effective for making a permanent magnet?
Option 1: Zinc
Option 2: Aluminium
Option 3: Copper
Option 4: Steel
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Correct Answer: Steel
Solution : The correct answer is steel.
Steel is the most ferromagnetic material from the above options. It can stay as a magnet for a longer period even after removing it from a magnetic field. There are two types of permanent magnets, hard magnets & soft magnets. Soft magnets lose their magnetism very quickly but hard magnets magnetise for a long period.
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Question : German silver is an alloy of
Option 1: Copper, nickel and silver
Option 2: Silver ,copper and aluminium
Option 3: Zinc copper and nickel
Option 4: Zinc silver and copper
Question : Bronze is an alloy of Which of the following?
Option 1: Copper and zinc
Option 2: Tin and Zinc
Option 3: Copper and Tin
Option 4: Iron and Zinc
Question : Which of the following elements is more reactive than copper?
Option 1: Gold
Option 2: Zinc
Option 3: Silver
Option 4: Platinum
Question : The most abundant metal in the Earth's crust is
Option 1: zinc
Option 2: copper
Option 3: Aluminium
Option 4: Iron
Question : Which of the following metals is most ductile?
Option 1: Copper
Option 2: Silver
Option 3: Gold
Option 4: Aluminium
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