Why is it necessary to separate oxygenated and deoxygenated blood in mammals?
2). How is the sex of the Child determined in human beings?
3). List the properties of magnetic field lines. Draw the magnetic field pattern around the current carrying circular coil.
4). How many 176 ohm resistors in parallel are required to carry 5 A on 220 volt line ?
5). Differentiate between Calcination and Roasting
6). Differentiate between Graphite and Diamond
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Answers
Answer:
1 It is necessary for them to separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature.
2 Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).
3 At the centre of the circular loop, The magnetic field lines are straight. Each segment of circular loop carrying current produces magnetic field lines in the same direction with in the loop. The direction of magnetic field at the centre of circular coil is perpendicular to the place of the coil
4 four resistors
5 Roasting involves heating of ore lower than its melting point in the presence of air or oxygen. Calcination involves thermal decomposition of carbonate ores. Roasting is carried out mostly for sulfide minerals. During calcination, moisture is driven out from an ore
6 In a dimond, each carbon atom is covalently bounded to four other carbon atoms along four corners of regular tetrahedron. ... Diamond is hard due to strong covalent bonds present in it. In a Graphite, carbon atoms are bounded together in a flat layers by an strong covalent bonds in a regular haxagon.