Assertion and Reason: Types, Methods and Examples
Assertion and Reason is a reasoning topic in which two statements are given. The first statement, called the Assertion (A), states a fact or a claim. The second statement, called the Reason (R), gives a possible cause or explanation for that claim. The candidate must decide whether each statement is true and, more importantly, whether the Reason correctly explains the Assertion. The answer is marked from a fixed set of standard codes, so the topic tests general knowledge and logical judgement at the same time.
This topic is popular in APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations because a question can be asked from any subject, including history, geography, science, polity and current affairs. A candidate who understands the exact meaning of each code and the difference between "true but not the explanation" and "true and the correct explanation" can score full marks with confidence. This article gives a complete deep-study revision of assertion and reason. It explains the basic terms, the five standard codes, the types of questions, the method of solving, the common mistakes and a practical preparation plan.
Basic Terms
- Assertion (A): the first statement, which makes a claim or states a fact.
- Reason (R): the second statement, which offers an explanation or a cause for the assertion.
- True statement: a statement that is factually correct.
- Explanation: a reason that directly and logically accounts for the assertion.
- Standard codes: the five fixed options used to mark the answer.
- Independent truth: the truth of a statement by itself, without reference to the other statement.
- Cause and effect: a relation in which the reason produces or explains the assertion.
- Correlation: two statements that are both true but not linked as cause and effect.
- Verification: checking a statement against a known fact or a definition.
- Elimination: removing the codes that do not satisfy the given conditions.
The Five Standard Codes
- Code (a): both A and R are true, and R is the correct explanation of A.
- Code (b): both A and R are true, but R is not the correct explanation of A.
- Code (c): A is true but R is false.
- Code (d): A is false but R is true.
- Code (e): both A and R are false.
Core Concepts and Method
- First test the assertion alone and decide whether it is true or false.
- Then test the reason alone and decide whether it is true or false.
- Only if both are true does the question of explanation arise; if either is false, the answer is decided at once.
- The reason must explain the assertion as a cause explains an effect, and must not be merely another true fact.
- A reason that is a consequence of the assertion, and not its cause, is not the correct explanation.
- A reason that is too general or unrelated does not explain the assertion.
- In mathematics and geometry, definitions and properties often make the reason a correct explanation.
- In history, the reason must describe the actual cause of the event stated in the assertion.
Types of Assertion and Reason Questions
The first type is the factual type, in which the assertion and reason come from history, geography, polity or general science. The second type is the conceptual type, in which the assertion and reason are based on a definition or a scientific law, often from physics, chemistry, biology or mathematics. The third type is the causal type, in which the reason states a genuine cause of the event mentioned in the assertion. The fourth type pairs two true statements that are related but not as cause and effect, so the answer is the second code. The fifth type gives a false reason with a true assertion, or the reverse, and tests careful verification. Many papers combine assertion and reason with current events, so the candidate must also keep general awareness up to date.
Steps to Solve an Assertion and Reason Question
First, read the assertion carefully and decide on its truth by recalling the relevant fact, definition or event. Second, read the reason carefully and decide its truth in the same way. Third, if both are true, ask whether the reason directly and logically explains the assertion. Fourth, if the reason explains the assertion, mark the first code; if the reason is true but does not explain the assertion, mark the second code. Fifth, if the assertion is true and the reason false, use the third code; if the assertion is false and the reason true, use the fourth code; if both are false, use the fifth code. Finally, recheck the code that you selected, because most mistakes happen when a candidate knows that both statements are true but misjudges the explanation.
Examination Trends
In competitive examinations assertion and reason is a common topic and usually carries two to four marks. The factual type from history and science appears most often, followed by the conceptual type. The second code, in which both statements are true but not connected as cause and effect, is a favourite of examiners because it separates careful candidates from hasty ones. In the Assam examinations the assertion often refers to Assamese history, geography, culture or government schemes, so local general knowledge is very useful here.
Common Mistakes to Avoid
- Do not mark the first code merely because both statements are true.
- Do not confuse the correct explanation with a related true statement.
- Do not treat a reason that is an effect or a consequence as a cause.
- Do not answer from memory without actually reading the reason.
- Do not ignore the possibility that both statements may be false.
- Do not change the statement while deciding its truth.
How to Prepare This Topic
Begin by memorising the five standard codes and their exact wording. Then practise the pure logic of explanation with simple cause-and-effect examples, so that the difference between "true and the correct explanation" and "true but not the explanation" becomes clear. After that, revise the factual areas from which this topic is usually set, such as Indian history, Assam history, geography, science, polity and important schemes. Since the topic mixes reasoning with general knowledge, daily revision of facts together with regular practice of the codes is the best preparation. Keep a notebook of every question in which both statements were true but you wrongly marked the first code, because that is the most common trap in this topic.
Another useful habit is to convert each assertion and reason pair into a simple "because" sentence before choosing the code. If the sentence "A is true because R" sounds natural and correct, the first code is likely; if the sentence sounds forced or wrong even though both statements are true, the second code is likely. This small test removes much of the confusion that the length of the statements creates. In the examination, attempt assertion and reason questions with a calm mind, because they reward careful reading more than speed. With the five codes and a steady revision of facts, this topic becomes a reliable source of marks.
Frequently Asked Questions
What is assertion and reason in reasoning?
It is a topic in which an assertion (A) and a reason (R) are given, and the candidate must decide whether each is true and whether the reason correctly explains the assertion, using the five standard codes.
What are the five standard codes?
The five codes are: both true and R explains A; both true but R does not explain A; A true and R false; A false and R true; and both false.
What is the difference between the first and the second code?
In the first code the reason correctly explains the assertion as a cause explains an effect, while in the second code both statements are true but the reason is not the correct explanation.
How do I decide whether the reason explains the assertion?
Convert the pair into a "because" sentence. If "A is true because R" reads correctly, the first code applies; if it reads wrongly even though both are true, the second code applies.
Which exams is this topic useful for?
It is useful for APSC, ADRE, Assam Police, DHS, DME, SSC and Railway examinations, and it can be set from history, geography, science, polity or current affairs.