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Reasoning Aptitude

ASSERTION AND REASON MCQs

Assertion And Reason

Total Questions : 239 | Page 9 of 24 pages
Question 81.

choose the correct alternative from the following :

Assertion (A) : When common salt is kept open, it absorbs moisture from the air.

Reason (R) : Common salt contains magnesium chloride.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

Magnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from

 the air when kept in open.


Question 82.

choose the correct alternative from the following :

Assertion (A) : An iron ball floats on mercury but gets immersed in water.

Reason (R) : The specific gravity of iron is more than that of mercury.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option C. -> A is true but R is false.

 Iron with specific gravity less than that of mercury but more than that of water,

floats in the former but gets immersed in the second.


Question 83.

choose the correct alternative from the following :

Assertion (A) : Uranium undergoes nuclear fusion reaction.

Reason (R) :  It has a big, unstable nucleus.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option D. -> A is false but R is true.

Having a big, unstable nucleus, uranium undergoes nuclear fission reaction.


Question 84.

choose the correct alternative from the following :

Assertion (A) : Copper is used to make electric wires.

Reason (R) : Copper has very low electrical resistance.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

A low electrical resistance of copper makes it a good electric conductor. So, it is used

to make electric wires.


Question 85.

choose the correct alternative from the following :

Assertion (A) : A little gap is left between iron rails.

Reason (R) : Iron expands in summer.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

Iron expands in summer. So, gaps are left between rails to allow for expansion.



Question 86.

choose the correct alternative from the following :

Assertion (A) : In India, the judiciary is independent of the executive.

Reason (R) : Judiciary favours the government and helps in the implementation of its plans.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option C. -> A is true but R is false.

In India, the judiciary* is completely independent of the executive. It has no interference in the affairs

 of the state nor can it be influenced by the government.


Question 87.

choose the correct alternative from the following :

Assertion (A) : Graphite is slippery and used as a lubricant.

Reason (R) : Graphite has free electrons.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option B. -> Both A and R are true but R is NOT the correct explanation of A.

Graphite possesses a layer structure with two successive layers held by weak forces

and able to slide over one another. So, graphite is slippery and this property finds

its use as a lubricant.

In graphite, each carbon atom is linked to three other carbon atoms while one electron

in the carbon atom is delocalised. So, graphite has free electrons.


Question 88.

choose the correct alternative from the following :

Assertion (A) : The steam engine was invented by James Watt.

Reason (R) : There was a problem of taking out water from flooded mines.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

The problem of pumping out water from the flooded mines provided the need of a

self working engine, which led James Watt to invent the same.


Question 89.

choose the correct alternative from the following :

Assertion (A) : Increase in carbon dioxide would melt polar ice.

Reason (R) : Global temperature would rise.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

The carbon dioxide envelope in earth's atmosphere traps the heat. With increase in

the proportion of carbon dioxide, therefore, the global temperature would rise, thus

causing the polar ice to melt


Question 90.

choose the correct alternative from the following :

Assertion (A) : Tamil Nadu gets most of the rainfall in winter.

Reason (R) : Tamil Nadu gets rainfall from retreating monsoons.


  1.    Both A and R are true and R is the correct explanation of A
  2.    Both A and R are true but R is NOT the correct explanation of A.
  3.    A is true but R is false.
  4.    A is false but R is true.
  5.    Both A and R are false.
 Discuss Question
Answer: Option A. -> Both A and R are true and R is the correct explanation of A

 Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.


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