Select the correct alternative :

Options

A. The charge gained by the uncharged body from a charged body due to conduction is equal to half of the total charge initially present.
B. The magnitude of charge increases with the increase in velocity of charge
C. Charge cannot exist without matter although matter can exist without net charge
D. Between two non-magnetic substances repulsion is the true of electrification (electrification means body has net charge)

Answer

To solve the question, we need to analyze each statement provided and determine whether they are correct or incorrect based on our understanding of electrostatics.

### Step-by-Step Solution:

1. **Statement A Analysis**:
- The statement claims that the charge gained by an uncharged body from a charged body due to conduction is equal to half of the total charge initially present.
- When a charged body (with charge +Q) comes into contact with an uncharged body, the charge will redistribute based on the potential of both bodies.
- If the bodies are of equal size, they will share the charge equally, but if they are of different sizes, the charge distribution will depend on their respective capacitances.
- Therefore, this statement is **incorrect**.

2. **Statement B Analysis**:
- This statement suggests that the magnitude of charge increases with the increase in the velocity of charge.
- However, the magnitude of charge is a property of the particle itself and does not depend on its velocity.
- Hence, this statement is also **incorrect**.

3. **Statement C Analysis**:
- The statement claims that charge cannot exist without matter, although matter can exist without net charge.
- This is true because charged particles (like electrons and protons) are forms of matter, and they carry charge.
- Neutrons are matter but do not carry charge, supporting the second part of the statement.
- Thus, this statement is **correct**.

4. **Statement D Analysis**:
- This statement states that between two non-magnetic substances, repulsion is the true form of electrification.
- If two bodies are charged with the same type of charge (both positive or both negative), they will repel each other.
- Therefore, this statement is also **correct**.

### Conclusion:
From the analysis, we find that:
- Statement A: Incorrect
- Statement B: Incorrect
- Statement C: Correct
- Statement D: Correct

Thus, the correct alternatives are **C and D**.