Q:

The reactivity of an atom arises from

A) the existence of unpaired electrons in the valence shell	B) the energy differences between the electron shells
C) the sum of the potential energies of all the electron shells	D) the average distance of the outermost electron shell from the nucleus

Answer & Explanation Answer: A) the existence of unpaired electrons in the valence shell

Explanation:

When atoms react they do so in order to reach the lowest energy, which is the most stable. The electrons orbitals will overlap in the way that reduces the energy the most. Orbitals of similar energy will produce the greatest stabilisation.The answer you gave isn't the whole story, it depends what species is reacting with what. The effective nuclear charge on the atom will affect the energy of the valance electrons.

Hence, the reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

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Q:

In 1991 the Soviet Union collapsed MAINLY because

A) the United States was a better country and capitalism ruled the world.	B) a civil war erupted in the southern republics.
C) years of economic stagnation left it far behind Western and Asian countries.	D) key Soviet leaders were assassinated.

Answer & Explanation Answer: B) a civil war erupted in the southern republics.

Explanation:

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Q:

Who is the author of the book 'WE INDIANS'

A) Khushwant Singh	B) Mulk Raj Anand
C) Nirad C. Chaudhary	D) Subramanya Swamy

Answer & Explanation Answer: A) Khushwant Singh

Explanation:

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Q:

Coral Reefs in India can be found in

A) Rameshwaram	B) Trivandrum
C) The coast of Orissa	D) Waltair

Answer & Explanation Answer: A) Rameshwaram

Explanation:

In India Coral Reefs can be found in Rameshwaram.

Coral reefs in India are one of the most ancient and dynamic ecosystems of India. The coral reefs not only provide a sanctuary to a myriad of marine life but also play a key role in protecting the coastline from erosion.

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients.

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Q:

Who did not have an important role in the Swadeshi Movement ?

A) Muslims	B) Students
C) Women	D) Peasants

Answer & Explanation Answer: D) Peasants

Explanation:

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Q:

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

People are now either exposed to the very best of their inner circle and the world, ________ to the worst — articles that look to shock, to provoke rage and put a lens on everything that is wrong _________ the world. Imperceptibly, it goes unsaid that often __________ pieces of ‘news’ fail to actually provide a constructive solution. The effect of such a disparity _________ to the same effect as news of TV and newspapers — a feeling that what we see does not ____________ our lives.

we see does not ____________ our lives.

A) reflects	B) reflective
C) reflection	D) reflect

Answer & Explanation Answer: D) reflect

Explanation:

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Q:

Which of the following does not contain the material particles

A) alpha - rays	B) beta - rays
C) gamma - rays	D) anode rays

Answer & Explanation Answer: C) gamma - rays

Explanation:

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Q:

Syadvad is a doctrine of

A) Lokayatism	B) Saivism
C) Jainism	D) Vaishnavism

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