Questions

Q:

What is called the small grasslands on the slopes of Lesser Himalayan range in Jammu and Kashmir?

 

A) Marg B) Bugyal
C) Payar D) Duar
 
Answer & Explanation Answer: A) Marg

Explanation:
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Q:

What is a binary semaphore? What is its use?

Answer

A binary semaphore is one, which takes only 0 and 1 as values. They are used to implement mutual exclusion and synchronize concurrent processes.

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Q:

If the velocity of a body is doubled its kinetic energy ________________.

 

A) is also doubled B) becomes half  
C) becomes 1/4 th   D) become 4 times  
 
Answer & Explanation Answer: D) become 4 times  

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Filed Under: Physics
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Q:

k purchased a table for Rs.11,000 and sold it for Rs.13,500.what is his gain  in percentage?

A) 19.8% B) 20.6%
C) 22.7% D) 22%
 
Answer & Explanation Answer: A) 19.8%

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Q:

Improve the bracketed part of the sentence.

This palace (has been belonging) to our family since generations.

A) has belonging B) has belonged
C) belonged D) no improvement
 
Answer & Explanation Answer: B) has belonged

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Filed Under: English
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Q:

Improve the bracketed part of the sentence.

If I (have had) money, I would have bought this car.

A) had B) did have
C) had had D) no improvement
 
Answer & Explanation Answer: A) had

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Q:

Select the synonym of

incursion

A) hurt B) retreat
C) aggression D) cut
 
Answer & Explanation Answer: C) aggression

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Q:

Which combination of atoms can form a polar covalent bond?

A) H and Br B) H and H
C) Na and Br D) N and N
 
Answer & Explanation Answer: A) H and Br

Explanation:

Only H and Br form Polar Covalent Bond.

 

Covalent bonding:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

1. Polar Covalent Bond

2. Nonpolar Covalent Bond

 

1. Polar Covalent Bond:

A Polar Covalent Bond is created when the shared electrons between atoms are not equally shared. This occurs when one atom has a higher electronegativity than the atom it is sharing with. The atom with the higher electronegativity will have a stronger pull for electrons (Similiar to a Tug-O-War game, whoever is stronger usually wins). As a result, the shared electrons will be closer to the atom with the higher electronegativity, making it unequally shared.

 

2. Nonpolar Covalent Bond:

A Nonpolar Covalent Bond is created when atoms share their electrons equally. This usually occurs when two atoms have similar or the same electron affinity. The closer the values of their electron affinity, the stronger the attraction. This occurs in gas molecules; also known as diatomic elements. Nonpolar covalent bonds have a similar concept as polar covalent bonds; the atom with the higher electronegativity will draw away the electron from the weaker one.

 

Here H and H and N and N form Non-polar covalent bonds. Na and Br form the ionic bond.

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