Logical 13 - Assertion and Reason

Key Points to Remember:

An Assertion is an affirmation, a declaration or a strong statement. Normally assertions have reasons.

In this question type, an assertion is first given followed by a reason. We are supposed to first judge whether the assertion (A) is true and then decide on whether the reason (R) is true and in case both A and R are true then we need to see whether the reason is the correct explanation of the Assertion.

Instructions:

For the Assertions (A) and Reasons (R), choose the correct alternative from the following.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

(e) If both A and R are false.

Practice Questions:

Question 1:

Assertion - Crude oil is abundantly found in nature.

Reason - It is the main raw material for all automobiles.

Solution - Both Assertion and Reason are true but the Reason does not explain the Assertion.
Hence, (b) is the answer.

Question 2:

Assertion - Anil Kumble lost his place in the Indian ODI squad sometime back.

Reason - In spite of being India’s best spinner he was considered to be too old for ODIs.

Both Assertion and Reason are right and the reason correctly explains the assertion.
Hence (a) is the right answer.

Question 3:

Assertion - Over the past few decades, there has been drastic global warming.

Reason - The push for economic development has increased to dangerous proportions the emission of greenhouse gases into the atmosphere.

Green house gases are the root cause of global warming. Hence both A and R are true and R explains A.
Hence, option (a) is correct.

Question 4:

Assertion - Kerala is the largest state in India.

Reason - Some of the leading car manufacturing companies of the world are Japanese.

The Assertion is false because Kerala is not the largest state in India. R is true but it is not related to Assertion.
Hence, option (d) is correct.

Question 5:

Assertion - The filament inside a bulb is made of copper.

Reason - Usually there is vacuum in the bulb.

A is false because a bulb’s filament is made of Tungsten and not copper. R is also false because inert gases or nitrogen are filled inside the bulb and there is no vacuum in the bulb.
Hence, option (e) is correct.

Time to Think:

Assertion - In medical parlance with respect to blood groups, a person with a blood group of ‘O’ is called Universal Donor.

Reason - A person with the ‘AB’ blood group can accept blood of all types, i.e., A, B, AB and O.