Mark the correct option(s) out of the following:

Options

A. Mechanical waves can be transverse in liquids.
B. in some medium, the speed of a longitudinal mechanical wave is greater than the speed of transverse mechanical wave.
C. transverse waves ate possible in bulk of a liquid.
D. Non-mechanical waves are transverse in nature.

Explanation

To solve the question, we need to analyze each option provided regarding mechanical and non-mechanical waves. Let's go through the options step by step.

### Step 1: Understand the Nature of Waves
- **Mechanical Waves**: These waves require a medium to travel and can be longitudinal or transverse. Longitudinal waves have oscillations in the direction of wave propagation, while transverse waves have oscillations perpendicular to the direction of wave propagation.
- **Non-Mechanical Waves**: These waves do not require a medium and are generally transverse in nature (like light waves).

### Step 2: Analyze Each Option

1. **Option 1: Mechanical wave can be transverse in liquid.**
- In liquids, mechanical waves are typically longitudinal. However, transverse waves can occur at the surface due to surface tension when forces act perpendicular to the surface.
- **Conclusion**: This option is **correct**.

2. **Option 2: In some mediums, the speed of longitudinal mechanical wave is greater than the speed of transverse mechanical wave.**
- In solids, longitudinal waves travel faster than transverse waves due to the differences in how particles move in response to compressive and shear forces.
- **Conclusion**: This option is **correct**.

3. **Option 3: Transverse waves are possible in bulk of the liquid.**
- Transverse waves in liquids are not possible in the bulk; they can only occur at the surface due to surface tension. In the bulk of the liquid, only longitudinal waves can propagate.
- **Conclusion**: This option is **incorrect**.

4. **Option 4: Non-mechanical waves are transverse in nature.**
- Non-mechanical waves, such as electromagnetic waves, are indeed transverse in nature.
- **Conclusion**: This option is **correct**.

### Final Answer
The correct options are **1, 2, and 4**.

---