Questions

Q:

Which country has pledged to ban sale of new petrol and diesel cars by 2030?

 

A) France B) United Kingdom
C) Germany D) Netherlands
 
Answer & Explanation Answer: B) United Kingdom

Explanation:
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Q:

What holds the sides of the DNA ladder together?

A) Polar covalent bonds B) Ionic bonds
C) Metallic bonds D) Covalent bonds
 
Answer & Explanation Answer: D) Covalent bonds

Explanation:

Deoxyribose, which is a pentose, and a phosphate group are the two molecules together form the two sides of the DNA i.e, A sugar (deoxyribose) and a phosphate.

DNA is a double-stranded molecule twisted into a helix (think of a spiral staircase). Each spiraling strand, comprised of a sugar-phosphate backbone and attached bases, is connected to a complementary strand by non-covalent hydrogen bonding between paired bases. The bases are adenine (A), thymine (T), cytosine (C) and guanine (G). A and T are connected by two hydrogen bonds. G and C are connected by three hydrogen bonds.

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Q:

Read the following information and answer the questions given below:

A has 28 elements, B has 32 elements and A U B has 40 elements.

How many elements does A B have?

A) 12 B) 8
C) 10 D) 20
 
Answer & Explanation Answer: D) 20

Explanation:
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Q:

A function cannot be defined inside another function

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

A function cannot be defined inside the another function, but a function can be called inside a another function.

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Q:

Every inductive argument is __________.

 

A) a comparison of two sets of events, ideas, and things B) based on rules, definitions, and principles
C) either valid or sound D) either invalid or unsound
 
Answer & Explanation Answer: A) a comparison of two sets of events, ideas, and things

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Q:

Rangaswamy Cup is associated with

A) Football B) Badminton
C) Cricket D) Hockey
 
Answer & Explanation Answer: D) Hockey

Explanation:

Rangaswamy Cup is associated with Hockey. Introduced in 1928, the Rangaswami Cup, was originally known as Inter-Provincial Tournament meant to pick up players for the national team for the Olympics.

Rangaswamy_Cup_is_associated_with1552387636.jpg image

After some years, The Hindu Group in 1951 presented the Rangaswami Cup that was named after one of its editors and since then the tournament is known as the Rangaswami Cup.

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Q:

Photosynthesis fulfills which of the following requirements of the autotrophic organisms?

I. Carbon

II. Water

III. Energy

A) Only I B) Only III
C) I and III D) All I, II and III
 
Answer & Explanation Answer: C) I and III

Explanation:
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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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