Assertion and Reason

• This type of reasoning questions consists of two statements; an assertion (statement of fact) and a reason (explanation for the assertion).

• You have to determine whether each statement is correct. If both the statements are correct, you have to determine whether the reason supports the assertion.

• There will be four answer choices for the possible outcomes and you have to select the correct one.

• Assertion (A): James Watt invented the steam engine.

Reason (R): It was invented to pump out the water from the flooded mines.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true, but R is not the correct explanation of A.
3. A is true, but R is false.
4. A is false, but R is true.
5. Both A and R are false.

Ans : A
Explanation : The need of self-working engine to pump out the water from the flooded mines led James Watt to invent the steam engine.

• Assertion (A) : Diamond is used for cutting glass.

Reason (R) : Diamond has a high refractive index

1. Both A and R are true but R is not the correct explanation of A.
2. Both A and R are true and R is the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.
5. Both A and R are false.

Ans : A
Diamond is hard due to its rigid three dimensional structure and so, it is used for cutting glass.

Refractive index of diamond is high and this gives it greater transparency and brilliance.