Question : The process in which metals are extracted from their ores by heating beyond the melting point is called ________.
Option 1: spinning
Option 2: smelting
Option 3: heaving
Option 4: extracting
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Correct Answer: smelting
Solution : The correct answer is smelting.
Smelting is the process of extracting metals from their ores by heating them over their melting point. The molten mixture is then purified and processed further to produce steel. This covers the extraction of iron from iron ore, copper extraction, and the extraction of other base metals from their ores, such as lead and zinc.
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Question : The lowest temperature at which a substance catches fire is called its ___________.
Option 1: melting point
Option 2: explosion point
Option 3: ignition temperature
Option 4: combustion temperature
Question : Two cylinders have their heights in the ratio 1 : 2 and their radii in the ratio 2 : 1. What is the ratio of their volumes?
Option 1: 3 : 1
Option 2: 1 : 3
Option 3: 2 : 1
Option 4: 1 : 2
Question : Which of the following statements is Incorrect?
Option 1: Metals are used in making cookware.
Option 2: Metals are used in the manufacture of automobiles.
Option 3: Living beings inhale metals during respiration.
Option 4: Metals are used in manufacturing jewellery.
Question : Water comes out of the leaves in the form of vapour by a process called:
Option 1: creepers
Option 2: transportation
Option 3: venation
Option 4: transpiration
Question : Concerning value addition in the textile industry, knitting is followed by which procedure?
Option 1: Garment manufacture
Option 2: Spinning
Option 3: Fibre production
Option 4: Dyeing and finishing
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