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Q:

Improve the bracketed part of the sentence

 

Vikram (insist that) he was innocent.

 

A) insisted on that B) insisted that
C) insisted on D) no improvement
 
Answer & Explanation Answer: B) insisted that

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Filed Under: English
Exam Prep: Bank Exams

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Q:

Rearrange the parts of the sentence in correct order.

The government should

P : provide health insurance

Q : to buy their own

R : for those unable

A) PQR B) RPQ
C) QRP D) PRQ
 
Answer & Explanation Answer: D) PRQ

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Filed Under: English
Exam Prep: Bank Exams

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Q:

Which of the following BPO companies is a wholly-owned subsidiary of Polaris software?

A) WNS B) Progeon
C) Optimus D) Spectramind
 
Answer & Explanation Answer: C) Optimus

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Filed Under: Business Awareness

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Q:

O_er_t_o_

Complete the missing letters of the given word.

A) Ordination B) Oterration
C) Ovvulation D) Operation
 
Answer & Explanation Answer: D) Operation

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Filed Under: Missing letters puzzles
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Q:

The ODBC core API consists of which of the following functions?

A) Commit or rollback transactions only B) Connect to data sources only
C) Connect to data sources with driver-specific information only D) Both 1 and 2 above are in the OBDC core API.
 
Answer & Explanation Answer: D) Both 1 and 2 above are in the OBDC core API.

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Filed Under: Database

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Q:

A convex mirror is used to form an image of a real object. The image

A) is diminished in size B) is erect
C) always lies between the pole and the focus D) all of the above
 
Answer & Explanation Answer: D) all of the above

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Filed Under: Physics

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Q:

Who among the following is the first Asian Winner of Nobel Prize

A) Mother Teresa B) Rabindranath Tagore
C) C.V.Raman D) None of these
 
Answer & Explanation Answer: B) Rabindranath Tagore

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Filed Under: Honours and Awards

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Q:

What is the oxidation number of carbon in NaHCO3?

A) -4 B) -3
C) +4 D) +2
 
Answer & Explanation Answer: C) +4

Explanation:

The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda.

Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged.

 

Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero.

Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get:

1 + 1 + (-6) + C = 0

-4 + C = 0

=> C = 4


This means the oxidation state of carbon in this compound is +4.

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Filed Under: Chemistry
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