Questions

Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Q:

The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

Explanation:
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Q:

In the following questions, one part of the sentence may have an error. Find out which part of the sentence has an error and click the buttoncorresponding to it. If the sentence is free from error, click the "No error" option.

He flowed into a rage (A)/ at the very (B)/ sight of that man (C)/ No error (D)

A) A B) B
C) C D) D
 
Answer & Explanation Answer: A) A

Explanation:
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Q:

In terms of size, Venus ranks no. ___ in our Solar System.

A) 5 B) 6
C) 7 D) 8
 
Answer & Explanation Answer: B) 6

Explanation:
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Q:

Which of the following devices converts Chemical energy into Electrical energy?

A) Electric heater B) Electric fan
C) Hair dryer D) Electric cell
 
Answer & Explanation Answer: D) Electric cell

Explanation:
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Q:

Friction is caused by the ______________ on the two surfaces in contact.

A) irregularities B) smoothness
C) densities D) gaps
 
Answer & Explanation Answer: A) irregularities

Explanation:
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Q:

ATM stands for

A) Any Time Money B) Auto Technology Money
C) Automated Teller Machine D) Automatic Transaction Machinery
 
Answer & Explanation Answer: C) Automated Teller Machine

Explanation:
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Q:

What is the rank of India in the Doing Business Report 2020, after the recent update of the World Bank?

 

 

A) 63 B) 72
C) 56 D) 85
 
Answer & Explanation Answer: A) 63

Explanation:
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