Question

4 Read the following sentences and write properties of metal. i) With copper wires Siya switches on light ii) Goldsmith made a sheet by hammering a gold ball. iii)Maya stretched the strings of the Sitar. iv) Raghav put a spoon in boiling soup and the spoon got hot​

Answer 1

Answer:

i) good conductor of electricity (all metals are very good conductor of heat)

ii) malleability ( it is a property by which metals are converted into thin sheets due to hammering)

iii) Ductility ( it is a property by which a metal is converted into thin strings)

iv) good conductor of heat ( all metals are good conductor of heat)

All these are the properties by which elements are classified as metals.

Hope it helps it out in this question.

Answer 2

Answer:

i. Good conductor of electricity

ii. Malleability

iii. Ductility

iv. Good conductors of heat

Explanation:

i. They are substances that make it simple for electricity to pass through them. A substance is said to be a good conductor of electricity if, when compared to another type of material, the first one permits a better flow of electricity through it.

Examples: Copper, Aluminum, Silver, Gold, Graphite

ii. Many metals have a notable degree of malleability, or the ability to be worked under the hammer, and it is this capacity that greatly influences how useful they are. Depending on the temperature, it changes.

The term "moldability" refers to the extension's vulnerability to pressure from a rolling press or hammer. This feature is unique to some metals, including gold, silver, iron, copper, etc., but not all; it is crucial to the arts and modern conveniences.

iii. Because of the metal's physical characteristics, when we tug on it, it will stretch as opposed to breaking. In other words, a material's ductile qualities are its capacity to experience significant plastic deformation under tensile stress prior to rapture. Nickel, copper, steel, and other ductile materials are examples.

Brittleness is the quality of a metal that breaks under tensile stress without generating stretch. Another name for it is an abrupt failure. Glass, cast iron, and other fragile materials are examples.

The ability of a material to absorb mechanical overload is determined by its ductility, which is a crucial factor in engineering and manufacturing.

iv. Good heat conductors are substances that easily allow heat to travel through them. The maximum thermal conductivity is found in metals like copper and aluminum, while the lowest is found in steel and bronze. Copper is a good material for heat exchangers because it is a good heat conductor. In addition to being excellent electrical conductors, metals like gold, silver, and iron are also good heat conductors.

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