Magnetic Effects of Electric Current — Science STD 10 — Question

Give explanations for the statements: All chromosomes are arranged parallel to equatorial plane of cell in metaphase of mitosis.

Compete the analogy :
Orbit of the space shuttle : 8.7m/s² : : Communication satellite : __________.

In two methods of control of corrosion of aluminium, either a layer of aluminium oxide is formed or a silver plating is done on the surface. State to which electrode the aluminium article is attached in these methods respectively.

An element A has an atomic number of 6. Another element B has 17 electrons in its one neutral atom.

1. N which groups of the periodic table would you expect to find these elements?
2. What type of bond is formed between A and B?
3. Suggest a formula of the compound formed between A and B.

In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.

1. Which carbon electrode (cathode or anode) is burnt away?
2. Why is this carbon electrode burnt away?

Write some of the important uses of electromagnets.

Why energy in coal is called chemical energy?

Explain the meaning of saturated and unsaturated hydrocarbons with two examples each.

If 3 resistances of 3 ohm each are connected in parallel, what will be their total resistance?