Reasoning Ability - MCQ Practice Questions

Understanding:

We are given two statements and must check which conclusion logically follows.

Step 1: Test Conclusion I

Since ALL rivers flow into the sea, and the Ganga IS a river, it directly and necessarily follows that the Ganga flows into the sea. This is a valid syllogistic deduction.

Step 2: Test Conclusion II

The statements tell us what rivers do, not what feeds seas. A sea could theoretically exist without rivers, or be fed by other sources. The premise does not establish that ALL seas are fed by rivers. This conclusion goes beyond what is stated and is therefore invalid.

Answer:

Only Conclusion I follows logically from the given statements.

Quick Tip:

In Statement-Conclusion questions, a conclusion must follow directly and completely from the given statements — never assume extra information or reverse the direction of a universal statement.

Understanding:

We must evaluate whether each conclusion logically follows from the given statements.

Step 1: Test Conclusion I

The statement says regular exercise IMPROVES mental health. Ravi exercises every day, so it is reasonable to conclude that Ravi's mental health is improved, i.e., he has good mental health. This follows as a logical inference.

Step 2: Test Conclusion II

The statement says exercise improves mental health, but it does NOT say that exercise is the ONLY path to good mental health. Therefore, we cannot conclude that people who do not exercise necessarily have poor mental health. This conclusion introduces an assumption not supported by the statements.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

Beware of conclusions that negate or reverse a given universal statement — they almost always introduce unwarranted assumptions.

Understanding:

We are given two premises and must determine which conclusion is valid.

Step 1: Test Conclusion I

From Premise 1, there exists a subset of politicians who are honest. From Premise 2, every honest person is respected. Combining these: that subset of politicians (who are honest) must also be respected. Therefore, SOME politicians are respected. This conclusion is valid.

Step 2: Test Conclusion II

Premise 1 says only SOME politicians are honest, not all. Since the path to being respected (via these premises) runs through honesty, we can only guarantee that SOME politicians are respected — not ALL. Conclusion II overstates the deduction and does not follow.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

When a premise contains 'Some', the conclusion can never be 'All'. A particular premise limits the reach of any conclusion drawn from it.

Understanding:

We must judge the validity of each conclusion based strictly on the given statements.

Step 1: Test Conclusion I

Six hours per day clearly qualifies as 'too much' television by any reasonable interpretation of the phrase. Since too much television is harmful and Priya watches too much, it logically follows that her health is being harmed. Conclusion I follows.

Step 2: Test Conclusion II

The statement says 'too much' television is harmful — it does not say television in any amount is harmful. The word 'too much' itself implies that moderate watching could be acceptable. Therefore, concluding that children should not watch television AT ALL is an exaggeration not supported by the statement. Conclusion II does not follow.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

Pay close attention to qualifying words like 'too much', 'some', 'always', 'never'. A conclusion that ignores the qualifier and makes an absolute claim is almost always invalid.

Understanding:

We are given two premises and must test each conclusion carefully.

Step 1: Test Conclusion I

All gold is precious, but precious things are NOT limited to gold only. Other things (diamonds, silver, etc.) can also be precious. So, the fact that no stone is gold does NOT mean no stone can be precious through some other route. Conclusion I oversteps the premises and does not follow.

Step 2: Test Conclusion II

Since all gold is precious, gold items are a subset of precious things. Since no stone is gold, those gold items (which are precious) are definitely not stones. Therefore, some precious things (namely, gold things) are not stones. This conclusion is valid and follows directly.

Answer:

Only Conclusion II follows from the given statements.

Quick Tip:

A Universal Negative (No A is B) combined with a Universal Affirmative (All B is C) does NOT allow you to conclude No A is C — other paths to C may exist outside B.

Understanding:

In Statement-Conclusion questions, conclusions must be drawn ONLY from the given statements, not from real-world knowledge.

Step 1: Test Conclusion I

The statement declares ALL birds can fly without exception, and penguins are identified as birds. By direct syllogism, penguins can fly. Even though we know in reality penguins cannot fly, we must judge based only on what the statements say. Conclusion I follows from the given premises.

Step 2: Test Conclusion II

The statement says ALL birds can fly, which means there is no bird that cannot fly as per the given statements. Conclusion II directly contradicts Statement 1 and therefore does NOT follow.

Answer:

Only Conclusion I follows when reasoning strictly from the given statements.

Quick Tip:

This question tests whether you can suspend real-world knowledge. In formal reasoning, you must accept the given statements as absolute truth and derive conclusions only from them — not from outside facts.

Understanding:

We must carefully note the qualifier in the statement before evaluating the conclusions.

Step 1: Test Conclusion I

Because the statement says 'MOST' (not 'all') students who study hard get good marks, there remains a possibility that Sneha could fall in the minority who do not. Saying she WILL (definitely) get good marks is too strong a claim. Conclusion I does not follow.

Step 2: Test Conclusion II

Since most hard-studying students do get good marks, and Sneha studies hard, it is quite probable — though not certain — that Sneha will get good marks. The word 'may' correctly captures this possibility without overstating certainty. Conclusion II follows.

Answer:

Only Conclusion II follows because 'most' introduces possibility, not certainty.

Quick Tip:

Words like 'most', 'many', 'generally', 'usually' in statements only justify conclusions with hedging words like 'may', 'might', or 'probably' — never absolute conclusions with 'will' or 'always'.

Understanding:

We must trace the logical chain through both premises carefully.

Step 1: Test Conclusion I

Fruits contain vitamins, and vitamins are essential for health. By the transitive property of universal affirmatives: All fruits → contain vitamins → are essential for health. Therefore, ALL fruits are essential for health. Conclusion I is valid.

Step 2: Test Conclusion II

Conclusion II reverses the direction of the logical chain. Just because all fruits are essential for health does not mean all things essential for health are fruits. Many other things (water, sleep, exercise) are also essential for health. This is an illegal conversion of a universal affirmative and Conclusion II does not follow.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

Never reverse a universal affirmative (All A are B does NOT mean All B are A). This is one of the most common traps in syllogism and statement-conclusion questions.

Understanding:

We evaluate both conclusions against the given statements.

Step 1: Test Conclusion I

City X qualifies as a city with poor street lighting. The statement asserts that such cities have high crime rates. Therefore, it follows that City X has a high crime rate. Conclusion I is valid.

Step 2: Test Conclusion II

The statement establishes a correlation between poor lighting and high crime, but does NOT claim that street lighting is the sole cause of crime, nor that fixing it will eliminate crime entirely. Using 'definitely eliminate' is far too absolute and goes well beyond what the premises support. Conclusion II does not follow.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

Correlation stated in a premise never justifies a conclusion about complete elimination or absolute causation. Watch for extreme words like 'definitely', 'completely', 'always', or 'eliminate' — they almost always make a conclusion invalid.

Understanding:

We are given a universal negative and a universal affirmative and must test both conclusions.

Step 1: Test Conclusion I

Since no exam is easy, exams are completely outside the set of 'easy things'. Since only easy things (as per Premise 2) are said to require less effort, exams — being entirely outside the easy-things group — do not require less effort. Therefore, NO exam requires less effort. Conclusion I follows validly.

Step 2: Test Conclusion II

Conclusion II directly contradicts Conclusion I and also contradicts the reasoning above. Since no exam is easy and only easy things require less effort, some exams requiring less effort is impossible under these premises. Conclusion II does not follow.

Answer:

Only Conclusion I follows from the given statements.

Quick Tip:

When a Universal Negative (No A is B) is combined with a Universal Affirmative (All B are C), you can validly conclude No A is C — because A and B share no members, so A cannot inherit any property exclusive to B.