STATEMENT-1 : Mechanical energy is the sum of macroscopic kinetic & potential energies.
STATEMENT-2 : Mechanical energy is that part of total energy which always remain conserved.

Options

A. Assertion is correct, reason is correct, reason is a correct explanation for assertion.
B. Assertion is correct, reason is correct, reason is not a correct explanation for assertion
C. Assertion is correct, reason is incorrect
D. Assertion is incorrect, reason is correct

Answer

To solve the question, we need to analyze both statements provided and determine their validity.

### Step-by-Step Solution:

1. **Understanding Statement 1**:
- Statement 1 claims that "Mechanical energy is the sum of macroscopic kinetic & potential energies."
- Mechanical energy is indeed defined as the sum of kinetic energy (KE) and potential energy (PE) associated with the motion and position of macroscopic objects.
- Therefore, Statement 1 is **correct**.

2. **Understanding Statement 2**:
- Statement 2 claims that "Mechanical energy is that part of total energy which always remains conserved."
- While total energy in a closed system is always conserved (according to the law of conservation of energy), mechanical energy may not always be conserved due to non-conservative forces (like friction or air resistance) that can convert mechanical energy into other forms of energy (like thermal energy).
- For example, when an object falls, some of its mechanical energy may be converted to thermal energy due to air resistance.
- Therefore, Statement 2 is **incorrect**.

3. **Conclusion**:
- Since Statement 1 is correct and Statement 2 is incorrect, we conclude that the overall assertion is that Statement 1 is true while Statement 2 is false.

### Final Answer:
- Statement 1 is correct, and Statement 2 is incorrect.