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Why do all planets have a spherical shape?

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Why do all planets have a spherical shape?

The recognized planets of the solar system are large bodies with a significant mass. All particles of a massive body experience a significant net attraction towards its center. Such a body is, therefore, forced to acquire a spherical shape. If the mass of the body is low, as for example that of a large number that inhabits the asteroidal belt between the Earth and the Mars, these bodies do not have to be spherical. The argument is given above also explains why the Earth cannot support mountains much higher than the Himalayas.

Why does the night sky appear dark ?

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Sky is nothing but the light scattered by the atmosphere. At night there is no light passing through the atmosphere. Flence, there is nothing to scatter. Therefore, there is no light coming from the atmosphere or anything else. That is the reason everything appears dark at night. That is why the night sky is dark.

★ What are the main considerations behind setting up trading blocs ?

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According to experts, to form a successful trading bloc, the members should have some elements of similarity. For instance, the chances of a bloc surviving increase if the members have similar levels of per capita GNP, geographic proximity, similar or compatible trading and political regimes. Typically, the underdeveloped or the developing economies will have arrangements that are modelled to support import substitution and regional development.
An industrialised or transition economy, on the other hand, will have an outward policy aimed more at boosting rather than controlling global trade. The conditions of agreements are generally regional and might even aim at reorganisation of certain industries. For example, the MERCOSUR (which is a bloc consisting Argentina, Brazil, Paraguay and Uruguay), Brazil and Argentina have an au-tomobile trade treaty under which each individual firm has to balance its Brazil-Argentina production and trades. This enables both countries to have plants and hence the profits are rationally distributed.

How does frost build up in refrigerators

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The refrigerator door has to be opened at times to put things in or take things out. When that happens, some outside air is bound to enter the refrigerator. Usually the air coming in from outside has higher humidity than the air in the inside. The mixing of the inner and outer air, therefore, leads to condensation of mois¬ture. This builds up on the cold cooling surface of the refrigerator, where it deposits as frost. This process goes on and on as the fridge is opened and shut frequently. Ultimately, one ends up with thick layers of frost in the deep freezer compartment of the refrigerator.

Gandhian Thought – Trusteeship

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God and an individual who had possessions got them only from him. Therefore, they did not belong to one individual but were meant for God’s
people as a whole. Thus, whatever a person had more than this proportionate share with him, he was a trustee of God for that portion of his people. He elaborated that the almighty who was all-powerful had no need to store for tomorrow and created from day-to-day. So if human beings
also learn to live from day to day and do not stock things, trusteeship would become a legalised institution.

The trustee would remain the legal owner during his lifetime and would also have the right to nominate his successor subject to legal sanction. The property would not be confiscated by State and society will be able to retain the ability of the original owner on his own right. Gandhiji, in fact, wished his concept of trusteeship to become a gift from India to the world.

Gandhiji had a firm conviction that his theory of trusteeship was not illusory or fanciful. He claimed, “My theory of ‘trusteeship’ is no make-shift, certainly no camouflage. I am confident that it will survive all other theories. It has the Sanction of philosophy and religion behind it. That possessors of wealth have not acted up to the theory does not prove its
falsity; it proves the weakness of the wealthy.” His idea was that society should avoid violence and conflict between labour and capital and haves and have-nots as a result of its acceptance of the concept of trusteeship in wealth and property.

Pyarelal, who was Gandhiji’s secretary, has summarised his views on trusteeship as under :

  1. Trusteeship provides a means of transforming the present capitalist order of society into an egalitarian one.
  2. It does not recognise any right of private property except to the extent permitted by society’ for its own welfare.
  3. It does not exclude legislative regulation of ownership and use of wealth.
  4. An individual is not free to hold or use his wealth for selfish satisfaction.
  5. Like the minimum wages, there should also be a limit upon the maximum income and the difference between the maximum and the minimum should be reasonable and equitable. It would also be variable from time to time so that the tendency would be towards obliteration of the difference.
  6. The character of production shall be governed by social necessity and not by personal greed or whim.