A sure test of electification is

Options

A. Attraction
B. Repulsion
C. Friction
D. Induction

Answer

To solve the question "A sure test of electrification is", we need to analyze the options provided: attraction, repulsion, friction, and induction.

### Step-by-Step Solution:

1. **Understanding Electrification**:
- Electrification refers to the process of charging an object, which can occur through various methods such as friction, conduction, or induction.

2. **Analyzing the Options**:
- **Attraction**: Two neutral objects can attract each other due to gravitational forces. Therefore, attraction alone cannot confirm electrification since it can occur without any electric charge.

- **Repulsion**: When two charged objects repel each other, it indicates that they have like charges (both positive or both negative). This is a clear sign of electrification because repulsion occurs only between charged bodies.

- **Friction**: This is a method of electrification but does not serve as a test for whether an object is electrified. It describes how charges can be transferred, not how to test for them.

- **Induction**: This is another method of charging but does not provide a direct test for electrification. It involves the redistribution of charges within an object due to the influence of a charged object nearby.

3. **Conclusion**:
- Out of the options, repulsion is the only definitive test for electrification because it indicates the presence of charge. If two objects repel each other, we can be sure that they are both charged.

Thus, the answer to the question is **repulsion**.

### Final Answer:
The sure test of electrification is **repulsion**.