Reasoning

Logic and Fallacies

1,716 Questions

Understand the fundamentals of propositional logic, logical inference rules, and paradoxes. This set includes identifying logical fallacies, including those found in classical Nyaya logic. Strong grasp of these concepts is crucial for scoring well in the reasoning sections of competitive tests.

Propositional logic modelsLogical inference rulesTypes of logical fallaciesParadoxes and contingent truthsNyaya logic concepts

Logic and Fallacies Questions

Multiple choice

Which of the following is an example of a fallacy of denying the antecedent?

  1. If it is raining, then the ground is wet.

  2. It is not raining.

  3. Therefore, the ground is not wet.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is an example of a fallacy of denying the antecedent because the conclusion does not follow logically from the premises.

Multiple choice

Which of the following is an example of a valid argument?

  1. All men are mortal.

  2. Socrates is a man.

  3. Therefore, Socrates is mortal.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is an example of a valid argument because the conclusion follows logically from the premises.

Multiple choice

What is the term for using logical fallacies or faulty reasoning to support a particular argument or position?

  1. Bandwagon

  2. Glittering generalities

  3. Logical fallacies

  4. Plain folks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Logical fallacies are a propaganda technique that involves using faulty reasoning or invalid arguments to support a particular position. By presenting flawed logic, propaganda can mislead the audience and make it difficult for them to critically evaluate the information.

Multiple choice

The statement "There are no pink elephants" is an example of:

  1. An analytic statement.

  2. A synthetic statement.

  3. A tautology.

  4. A contradiction.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A synthetic statement is true or false based on empirical evidence, and "There are no pink elephants" is true based on our observations of the world.

Multiple choice

The statement "Grass is green" is an example of:

  1. An analytic statement.

  2. A synthetic statement.

  3. A tautology.

  4. A contradiction.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The truth of "Grass is green" is determined by empirical observation, making it a synthetic statement.

Multiple choice

The statement "2 + 2 = 4" is an example of:

  1. An analytic statement.

  2. A synthetic statement.

  3. A tautology.

  4. A contradiction.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A tautology is a statement that is true by virtue of its logical form, and "2 + 2 = 4" is true regardless of any empirical evidence.

Multiple choice

The statement "Nothing is true" is an example of:

  1. An analytic statement.

  2. A synthetic statement.

  3. A tautology.

  4. A contradiction.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A contradiction is a statement that is both true and false at the same time, and "Nothing is true" is self-contradictory.

Multiple choice

What is the term for the logical fallacy of affirming the consequent?

  1. Vyabhichara

  2. Hetvabhasa

  3. Sadhyasama

  4. Asiddha
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vyabhichara is the term for the logical fallacy of affirming the consequent. It occurs when the conclusion of an argument is true, but the premises do not necessarily support it.

Multiple choice

What is the term for the logical fallacy of denying the antecedent?

  1. Viruddha

  2. Anaikantika

  3. Satpratipaksha

  4. Asiddha
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viruddha is the term for the logical fallacy of denying the antecedent. It occurs when the conclusion of an argument is false, but the premises do not necessarily contradict it.

Multiple choice

What is the term for the logical fallacy of begging the question?

  1. Anaikantika

  2. Satpratipaksha

  3. Asiddha

  4. Petitio principii
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Petitio principii is the term for the logical fallacy of begging the question. It occurs when the conclusion of an argument is assumed in one of the premises.

Multiple choice

What is the term for the logical fallacy of the undistributed middle term?

  1. Anaikantika

  2. Satpratipaksha

  3. Asiddha

  4. Vyabhichara
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vyabhichara is the term for the logical fallacy of the undistributed middle term. It occurs when the middle term of a syllogism is not distributed in both premises.

Multiple choice

What is the term for the logical fallacy of the illicit major?

  1. Anaikantika

  2. Satpratipaksha

  3. Asiddha

  4. Ativyapti
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ativyapti is the term for the logical fallacy of the illicit major. It occurs when the major term of a syllogism is distributed in the conclusion, but not in the major premise.

Multiple choice

What is the term for the logical fallacy of the illicit minor?

  1. Anaikantika

  2. Satpratipaksha

  3. Asiddha

  4. Avachchedakatva
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Avachchedakatva is the term for the logical fallacy of the illicit minor. It occurs when the minor term of a syllogism is distributed in the conclusion, but not in the minor premise.

Multiple choice

What is the term for the logical fallacy of the negative conclusion?

  1. Anaikantika

  2. Satpratipaksha

  3. Asiddha

  4. Viruddha
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Viruddha is the term for the logical fallacy of the negative conclusion. It occurs when the conclusion of a syllogism is negative, but the premises are both affirmative.

Multiple choice

What is the truth value of the proposition "$p \wedge \neg p$"?

  1. True

  2. False

  3. Indeterminate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The proposition "$p \wedge \neg p$" is a contradiction, meaning it is always false.