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 statements is an example of inductive reasoning?

  1. All swans are white. Therefore, all birds are white.

  2. The sun has risen every day for the past million years. Therefore, the sun will rise tomorrow.

  3. All metals are good conductors of electricity. Therefore, copper is a good conductor of electricity.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is an example of inductive reasoning because it makes a generalization based on past observations. The premise states that the sun has risen every day for the past million years, and the conclusion states that the sun will rise tomorrow. While this conclusion is not necessarily true, it is based on the inductive reasoning that the past pattern will continue in the future.

Multiple choice

Which of the following statements is an example of deductive reasoning?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. This shape has three sides. Therefore, this shape is a triangle.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is an example of deductive reasoning because the conclusion logically follows from the premises. The first premise states that all dogs are mammals, and the second premise states that this animal is a dog. Therefore, it can be logically concluded that this animal is a mammal.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All swans are white. Therefore, all birds are white.

  2. The sun has risen every day for the past million years. Therefore, the sun will rise tomorrow.

  3. All metals are good conductors of electricity. Therefore, copper is a good conductor of electricity.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a logical fallacy known as a hasty generalization. The premise states that all swans are white, but this does not necessarily mean that all birds are white. There are many other species of birds that are not white, such as penguins, crows, and blue jays.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All metals are good conductors of electricity. Therefore, copper is a good conductor of electricity.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all triangles have three sides, and the conclusion states that this shape with three sides is a triangle. However, the fact that this shape has three sides does not necessarily mean that it is a triangle. There are many other shapes that also have three sides, such as squares, rectangles, and hexagons.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All metals are good conductors of electricity. Therefore, copper is a good conductor of electricity.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all metals are good conductors of electricity, and the conclusion states that copper is a good conductor of electricity. However, the fact that copper is a good conductor of electricity does not necessarily mean that it is a metal. There are many other materials that are also good conductors of electricity, such as graphite, salt water, and human skin.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all birds can fly, and the conclusion states that this creature can fly. However, the fact that this creature has wings does not necessarily mean that it can fly. There are many creatures that have wings but cannot fly, such as penguins, ostriches, and emus.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all dogs are mammals, and the conclusion states that this animal is a mammal. However, the fact that this animal is a dog does not necessarily mean that it is a mammal. There are many other animals that are not mammals, such as birds, reptiles, and amphibians.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all triangles have three sides, and the conclusion states that this shape with three sides is a triangle. However, the fact that this shape has three sides does not necessarily mean that it is a triangle. There are many other shapes that also have three sides, such as squares, rectangles, and hexagons.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all roses are red, and the conclusion states that this flower is a rose. However, the fact that this flower is red does not necessarily mean that it is a rose. There are many other types of flowers that are also red, such as tulips, poppies, and carnations.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All metals are good conductors of electricity. Therefore, copper is a good conductor of electricity.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all metals are good conductors of electricity, and the conclusion states that copper is a good conductor of electricity. However, the fact that copper is a good conductor of electricity does not necessarily mean that it is a metal. There are many other materials that are also good conductors of electricity, such as graphite, salt water, and human skin.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all birds can fly, and the conclusion states that this creature can fly. However, the fact that this creature has wings does not necessarily mean that it can fly. There are many creatures that have wings but cannot fly, such as penguins, ostriches, and emus.

Multiple choice

Which of the following statements is a logical fallacy?

  1. All dogs are mammals. This animal is a dog. Therefore, this animal is a mammal.

  2. All birds can fly. This creature has wings. Therefore, this creature can fly.

  3. All roses are red. This flower is red. Therefore, this flower is a rose.

  4. All triangles have three sides. Therefore, this shape with three sides is a triangle.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is a logical fallacy known as affirming the consequent. The premise states that all dogs are mammals, and the conclusion states that this animal is a mammal. However, the fact that this animal is a dog does not necessarily mean that it is a mammal. There are many other animals that are not mammals, such as birds, reptiles, and amphibians.

Multiple choice

Which of the following is NOT a type of reasoning?

  1. Deductive reasoning

  2. Inductive reasoning

  3. Abductive reasoning

  4. Analogical reasoning

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Deductive reasoning is the process of drawing conclusions from general principles. Inductive reasoning is the process of drawing conclusions from specific observations. Analogical reasoning is the process of drawing conclusions based on similarities between two things. Abductive reasoning is not a type of reasoning.

Multiple choice

Which Pramana is based on reasoning and logical deduction?

  1. Perception

  2. Inference

  3. Comparison

  4. Testimony

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Inference is the Pramana that is based on reasoning and logical deduction.

Multiple choice

What is a hypothesis?

  1. A hypothesis is a statement that is assumed to be true for the purpose of testing

  2. A hypothesis is a statement that is known to be true

  3. A hypothesis is a statement that is not supported by evidence

  4. A hypothesis is a statement that is not falsifiable

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A hypothesis is a statement that is assumed to be true for the purpose of testing. It is a tentative explanation for a phenomenon that is based on evidence and observation. Hypotheses are tested through research studies to determine if they are supported or refuted.