Q:

Covalent bonds hold atoms together because they

A) fill shells without giving atoms much charge	B) bring electrons closer to protons
C) Both A & B	D) use forces between nuclei as well as forces between electrons

Answer & Explanation Answer: C) Both A & B

Explanation:

Covalent bonds hold atoms together because the attraction between the positively charged nuclei and the negatively charged shared electrons is greater than the repulsions between the nuclei themselves.

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Filed Under: Chemistry
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Q:

Who organized 'Red Army'

Answer

Trotsky

Workspace

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Subject: World History

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Q:

Which the smallest among all the birds?

A) Ostrich	B) Humming Bird
C) King Fisher	D) Sparrow

Answer & Explanation Answer: B) Humming Bird

Explanation:

humming Bird is the smallest among all the birds

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Filed Under: Books and Authors

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Q:

Hypnology is the study of

A) blood	B) nerves
C) sleep	D) disease

Answer & Explanation Answer: C) sleep

Explanation:

Hypnology is the study of sleep.

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Filed Under: General Science
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Q:

In India, population density is defined as the number of persons

A) Per square mile	B) Per square kilometre
C) Per lakh square mile	D) Per lakh square kilometre

Answer & Explanation Answer: B) Per square kilometre

Explanation:

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Filed Under: Indian Economy

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Q:

What is the usual colour of Aircraft data recorder "Black box" ?

A) Black	B) Orange
C) Blue	D) Greeen

Answer & Explanation Answer: B) Orange

Explanation:

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Filed Under: General Awareness

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Q:

Which has the lowest albedo?

A) dark surfaces	B) light surfaces
C) Both A & B	D) None of the above

Answer & Explanation Answer: A) dark surfaces

Explanation:

Albedo refers to a material's ability to reflect sunlight. Since 30% of the sun's energy is reflected by the entire earth, the earth has an average albedo of 0.30.

Generally, dark surfaces have a low albedo and light surfaces have a high albedo.

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Filed Under: Physics
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Q:

Kyoto protocol expired in which of the following year?

A) 2008	B) 2012
C) 2010	D) 2009

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