1. Least count of a Vernier metric micrometer ? ans. 0.001mm (A vernier micrometer is used for measurement purposes. The metric micrometer looks similar like an ordinary micrometer. The difference between both are graduations on the sleeve and the barrel. There are two seperate lines on the sleeve of metric micrometer. The lower row contains millimeter graduations and the upper row represents one half millimeter. Thimble moves the spindle 0.5 mm on each complete turn. The vernier metric micrometer has an ability to measure about two thousands of a mm.) 2. A chemical compound of carbon with iron is called ? ans. Cementite (Cementite is an intermetallic component of Iron and Carbon. Commonly called as Iron Carbide with formula Fe3C. It has an orthorhombic crystal structure with 6.67%Carbon and 93.3% Iron. Simply for your knowledge lets assume You have iron and Coke available as raw materials. Coke is obtained from Coking of Coal by carbonisation. Now heat them together in a furn
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