Question

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06Q. A magnet is repeatedly moved closely over a mixture of iron powder and
sulphur powder. Which of the following statements is false :
(a) Iron powder is attracted towards magnet.
(6) Sulphur powder is left behind
(c) Black FeS will be formed.
(d) Iron powder and sulphur powder are separated.
07Q. Sample (X) is a mixture of iron and sulphur. On separately heating sulphur
in excess of air. (Y) is formed. Which of the following is true for (x) and (Y)
respectively :
(a) Heterogeneous, homogeneous
(b) Heterogeneous, heterogeneous
(c) Homogeneous, homogeneous
(d) Homogeneous, heterogeneous
08Q. Take mixture of iron filings and sulphur powder in one watch glass. In the
other watch glass, put iron sulphide. Now, move a bar magnet over both the watch
glasses. The correct observation would be:​

Answer 1

Answer:

Lubrication - It helps in reducing roughness, which decreases friction. 2) Ball Bearings - Since rolling friction is less than sliding friction, ball bearings help in maintaining minimal surface of contact between two surfaces in motion. 3) Polishing - Smooth surfaces or bearings work better than the rough ones.

Explanation:

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