Question

Assertion: The values of strain for same stress are different for most substances while increasing the load and while decreasing the load

Reason: Due to elastic hysteresis strain will lag behind stress

• A. Assertion is true but reason is false
• B. Assertion is false but reason is true
• C. Both assertion and reason are true and reason is correct explanation of assertion
• D. Both assertion and reason are true and reason is not correct explanation of assertion

Answer 1

Answer: (C)

Both assertion and reason are true and reason is correct explanation of assertion

Answer 2

The assertion states that strain values differ for the same stress during loading and unloading. This is a direct consequence of elastic hysteresis. Elastic hysteresis occurs because the strain lags behind the stress during cyclic loading and unloading, leading to energy dissipation. Therefore, for a given stress, the strain will be different when the load is increasing compared to when it is decreasing. This makes both the assertion and the reason true, and the reason correctly explains the assertion.