Questions

Q:

What is the difference between the following declarations?

extern int fun();

int fun();

Answer

There is no difference except for the fact that the first one gives a hint that the function fun() is probably in another source file.

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Subject: Programming

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Q:

What are the original members of Bank of Central African States

A) Cameroon and Central African Republic B) Chad and Republic of the Congo
C) Gabon D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:
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Filed Under: World Organisations

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Q:

When a chemical bond is broken energy is

A) transferred B) released
C) used D) None of the above
 
Answer & Explanation Answer: C) used

Explanation:

Bond breaking is an endothermic process.

Hence, bond breakage needs an amount of energy and uses some energy based on the strength of the bond to break the bond.

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Filed Under: Chemistry
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Q:

The Nobel Peace Prize is awarded in which city?

A) Oslo B) Stockholm
C) Radhuset D) Spain
 
Answer & Explanation Answer: A) Oslo

Explanation:

The Nobel Peace Prize is awarded in Oslo city in Norway while other Nobel Prizes in Physics, Chemistry, Literature, Medicine,... are awarded in Stockholm, Sweden.

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Filed Under: General Awareness
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Q:

Which of the following is not an intrusive igneous body?

A) Stock B) Dike
C) Stope D) Batholith
 
Answer & Explanation Answer: C) Stope

Explanation:

These are called intrusive igneous rocks because the magma has intruded into pre-exiting rock layers. Types of intrusive igneous rocks are granite and basalt .

A batholith is the largest of the intrusive bodies.

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Filed Under: Physics
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Q:

Which of the following is a function of Earth's atmosphere?

A) supplies the oxygen and water for life B) screens out much of the Sun's ultraviolet radiation
C) insulates the surface against temperature extremes D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Here all the options given are important functions of Earth's atmosphere.

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Q:

Which of the following is not a strong acid?

A) H2SO4 B) CH3COOH
C) HCl D) HBr
 
Answer & Explanation Answer: B) CH3COOH

Explanation:

CH3COOH, chemically known as Acetic acid, is not a strong acid among the given acids like Sulphuric acid, Hydrochloric acid,...

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Q:

How does molecular shape affect polarity?

Answer

Polarity :: 


The polarity of a molecule defines its other physical properties such as melting point, boiling point, surface tension, vapor pressure etc... Simply, polarity occurs when the electron distribution in a molecule is asymmetric. This results in a net dipole moment in the molecule. One end of the molecule is charged negative while the other gets a positive charge.


 


The polarization of a molecule greatly depends on the shape of the molecule. A diatomic molecule like HF mentioned above has no issue of shape. The net dipole moment is only due to the uneven distribution of electrons between the two atoms. However, when there are more than two atoms involved in making a bond, there are many complexities.


 


The water molecule is of bent shape. Therefore, when the two pair of electrons shared by oxygen with two hydrogen atoms is pulled towards oxygen, the net dipole moment results in the direction of the oxygen atom. There is no other force to cancel out the resultant dipole moment. Hence, the water molecule is highly polar.


 


Ammonia molecule is of a pyramid shape and the electronegative N atom pulls the electrons towards itself. The three N-H bonds are not in the same plane; hence the dipole moments created do not get canceled out. This makes ammonia a polar molecule.


 


However, the dipole moments sometimes get canceled due to the shape of the molecules, making the molecule non-polar. Carbon dioxide is such a molecule.

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