15 Questions MCQ Test Science & Technology for UPSC CSE - Test: Physical Properties of Metals
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Detailed Solution for Test: Physical Properties of Metals - Question 1
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.
The best conductor of electricity among the following is:
Detailed Solution for Test: Physical Properties of Metals - Question 2
Silver is the best conductor of electricity among the given options because it has a relatively low electrical resistivity. The electrons in silver are able to move more freely than those of the other elements, allowing electricity to flow more easily. This is due to the structure of the silver atom, which allows for more free electrons on the outer shell. Additionally, silver has a high thermal conductivity, meaning it is able to transfer heat quickly and efficiently.
Which one of the following is a poor conductor of heat?
Detailed Solution for Test: Physical Properties of Metals - Question 4
Heat energy is conducted by transferring energy of atoms vibrating at high level. This energy is transferred by vibrating neighboring atom. Since high density of mercury, there is no enough room for vibrating mercury atoms. So it can’t be heated easily.
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.
Detailed Solution for Test: Physical Properties of Metals - Question 5
It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.
Detailed Solution for Test: Physical Properties of Metals - Question 7
Graphite is an interesting material, an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.
The non-metal that is liquid at room temperature is:
Detailed Solution for Test: Physical Properties of Metals - Question 13
Metals that are liquids at room temperature are mercury (Hg) and gallium (Ga). Non-metals liquid at room temperature - bromine (Br). However, other elements such as caesium (Cs), rubidium (Rb) and francium (Fr) also become liquids at a few degrees above room temperature.
Detailed Solution for Test: Physical Properties of Metals - Question 14
The lustre of a metal is due to presence of free electrons.
It has to do with the way light and electrons on the surface of metals interact. The outer electrons in a metal are almost not bound to any individual atom, thus are relatively free, and are concentrated on the surface. These electrons (electron density) tend to oscillate at a collective frequency.
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