Questions

Q:

The freezing point of water at 760mm pressure is

A) 0 K B) 273 K
C) 273 C D) -273 C
 
Answer & Explanation Answer: B) 273 K

Explanation:

K is degree kelvin

Zero K corresponds to -273  K = C + 273

The freezing point of water being 0 C, on the kelvin scale it is 0 C + 273 K

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Filed Under: Chemistry

12 9365
Q:

What is the conjugate base of H2O?

A) NH3+ B) OH-
C) H2O D) All the above
 
Answer & Explanation Answer: B) OH-

Explanation:

A conjugate acid, is a species formed by the reception of a proton (H+) by a base—in other words, it is a base with a hydrogen ion added to it.

On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid.

Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic.

Represented as the following chemical reaction:

Acid + Base ⇌ Conjugate Base + Conjugate Acid

 

The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.

 

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Filed Under: Chemistry
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4 9358
Q:

'Goldman Awards' are given for outstanding contribution in which of the following fields

A) Population Control B) Popularization of Science
C) Conservation of Energy D) Protection of environment
 
Answer & Explanation Answer: D) Protection of environment

Explanation:
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Filed Under: Honours and Awards

6 9357
Q:

The Gandhi-Irwin pact was signed in the year

 

A) 1930 B) 1931
C) 1932 D) 1933
 
Answer & Explanation Answer: B) 1931

Explanation:
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Filed Under: Inventions
Exam Prep: Bank Exams

42 9346
Q:

Plants synthesis protein from

A) amino acids B) starch
C) fatty acids D) sugar
 
Answer & Explanation Answer: A) amino acids

Explanation:

We know that, proteins are polymers of amino acids. So, plants are also used to synthesise protein from amino acids. Hence, plants synthesis protein from amino acids in the presence of ATP by specific synthetases.

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Filed Under: General Science
Exam Prep: CAT , Bank Exams , AIEEE
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11 9336
Q:

Choose the word which is nearly opposite in meaning to the given word:-

Refractory

A) Refreshing B) Burdensome
C) Privileged D) Manageable
 
Answer & Explanation Answer: D) Manageable

Explanation:

Refractorymeans unmanageablewhich is nearly opposite to manageable.Refreshing means revivifyingBurdensome means troublesomePrivileged means advantage

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Filed Under: English
Exam Prep: Bank Exams

0 9335
Q:

Every component of your computer is either

A) Hardware or CPU B) RAM/CPU or Hardware
C) Hardware or Software D) System or Application software
 
Answer & Explanation Answer: C) Hardware or Software

Explanation:

All the computers have components that are either Hardware or Software.

The five major components of computers are :

-> Input Unit

-> Output Unit

-> CPU Unit

-> ALU Unit and

-> Control Unit.

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Filed Under: Computer
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33 9333
Q:

India won its first Olympic hockey gold in

A) 1928 B) 1932
C) 1936 D) 1948
 
Answer & Explanation Answer: A) 1928

Explanation:
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Filed Under: Sports

33 9327