Assertion : All black coloured objects are considered black bodies.
Reason : Black colour is a good absorber of heat

Options

A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason is true.

Explanation

To solve the question regarding the assertion and reason, we will analyze both statements step by step.

### Step 1: Understand the Assertion
- **Assertion**: "All black colored objects are considered black bodies."
- A black body is defined in physics as an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. However, not all black-colored objects behave as black bodies. For instance, a black object may not absorb all wavelengths of light perfectly; it may reflect some light depending on its material properties.

### Step 2: Understand the Reason
- **Reason**: "Black color is a good absorber of heat."
- It is true that black surfaces are generally good absorbers of heat. This is because they absorb a wide range of wavelengths of electromagnetic radiation, particularly in the visible spectrum. However, this does not mean that all black objects are perfect black bodies.

### Step 3: Evaluate the Truth of Each Statement
- The assertion is **false** because not all black-colored objects can be classified as black bodies.
- The reason is **true** because black surfaces do absorb heat well, but this does not qualify them as black bodies.

### Step 4: Conclusion
- Since the assertion is false and the reason is true, the correct conclusion is that the assertion does not support the reason. Therefore, the answer is that the assertion is false and the reason is true.

### Final Answer
- The assertion is false, and the reason is true.