Reasoning | Deductive

A deductive argument is invalid if :

ক

<span style=" "> Its premises and conclusion are all true.</span>

খ

Its premises and conclusion are all false.

গ

Its premises are all false but its conclusion is true.

ঘ

Its premises are all true but its conclusion is false.

Select the code which is not correct in the context of deductive argument with two premises :

ক

An argument with one true premise, one false premise and a false conclusion may be valid

খ

An argument with two true premises and a false conclusion may be valid.

গ

An argument with one true premise, one false premise and a true conclusion may be valid.

ঘ

An argument with two false premises and a false conclusion may be valid

Given below are some characteristics of reasoning. Select the code that states a characteristic which is not of deductive reasoning :

ক

The conclusion must be based on observation and experiment.

খ

The conclusion should be supported by the premise/premises.

গ

The conclusion must follow from the premise/premises necessarily.

ঘ

The argument may be valid or invalid.

Product of two consecutive integers is divisible by 2. Therefore 4*5 (=20) is divisible by 2. This is an example of which type of reasoning?

ক

Abductive

খ

Informal

গ

Inductive

ঘ

Deductive

Bangalore is bigger than Jhansi, Satpura is bigger than Chittoor, and Rajgarh is not as big as Jhansi but is bigger than Satpura. Which is the smallest?

ক

Bangalore

খ

Jhansi

গ

Satpura

ঘ

Chittoor

Which one of the following is not a part of immediate deductive inference?

ক

Conversion

খ

Obversion

গ

Syllogism

ঘ

Contraposition

In which of the following arguments ‘the relation that exists between premises and conclusion is that of logical necessity’?

ক

Inductive

খ

Deductive

গ

Demonstrative

ঘ

Analogical

Given below are some characteristics of reasoning. Select the code that states a characteristic which is not of deductive reasoning:

ক

The conclusion must be based on observation and experiment.

খ

The conclusion should be supported by the premise/premises.

গ

The conclusion must follow from the premise/premises necessarily.

ঘ

The argument may be valid or invalid.

Which is an example of a correct deductive argument?

ক

No one got an ‘A’ grade on yesterday’s test. Jatin wasn’t in school yesterday. Jatin will make up the test today and get an ‘A’ grade.

খ

All human beings are the favor of world peace. Terrorists don’t care about world peace. Terrorists bring about destruction.

গ

You have to be 16 years old to get a driver’s license. Abhi will be 16 years old tomorrow. Therefore, Abhi can now buy a car.

ঘ

There are 24 CDs on the top shelf of my bookcase and 14 on the lower shelf. There are no other CDs in my bookcase. Therefore there are 38 CDs in my bookcase.

In which of the following instances, deductive argument is invalid?

ক

When its premises and conclusion are all false.

খ

When its premises and conclusion are all true.

গ

When its premises are true but conclusion is false.

ঘ

When its premises are false and conclusion is true.

Which one of the following statements is correct with reference to a deductive argument?

ক

The relation between premises and conclusion is one of matter of fact

খ

The relation between premises and conclusion is one of logical necessity

গ

The relation between premises and conclusion is that of empirical necessity

ঘ

The relation between premises and conclusion is a matter of ascertainment of probability