Assertion and reason - Scientific concepts — task. Physics CBSE Live product, Class 9 (2026-27).

Assertion and reason based question:

1. Assertion: SI units are used worldwide.

Reason: Using common units avoids confusion in measurements.

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Assertion is true, but Reason is false.
Assertion is false, but Reason is true.

2. Assertion: Air resistance can sometimes be ignored in a simple model.

Reason: Scientists often ignore smaller effects in basic models.

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Assertion is true, but Reason is false.
Assertion is false, but Reason is true.

Did you find an error?

7. Assertion and reason - Scientific concepts