Which of the following statements are correct ?
(i) Human body is a good conductor of electricity.
(ii) The air gap surrounding an electric circuit acts as a conductor.
(iii) Silver conducts electricity better than any other metal.
(iv) When electricity lights up a bulb, no heat is produced.

Options

A. (i) and (ii)
B. (iii) and (iv)
C. (i) and (iii)
D. (ii) and (iii)

Explanation

To determine which of the statements are correct, we will analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement (i): Human body is a good conductor of electricity.**
- The human body contains a significant amount of water and electrolytes, which allow electric current to flow through it. Therefore, the human body is indeed a good conductor of electricity.

**Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement (ii)
**Statement (ii): The air gap surrounding an electric circuit acts as a conductor.**
- Air is generally considered a poor conductor of electricity. It acts more like an insulator under normal conditions. Therefore, the air gap does not facilitate the flow of electric current.

**Conclusion:** This statement is **incorrect**.

### Step 3: Analyze Statement (iii)
**Statement (iii): Silver conducts electricity better than any other metal.**
- Silver is known to be the best conductor of electricity among all metals. While copper is also a very good conductor, silver has a higher conductivity.

**Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement (iv)
**Statement (iv): When electricity lights up a bulb, no heat is produced.**
- When electricity flows through a bulb, it converts electrical energy into light and heat energy. Therefore, heat is indeed produced when a bulb lights up.

**Conclusion:** This statement is **incorrect**.

### Final Summary of Statements:
- (i) Correct
- (ii) Incorrect
- (iii) Correct
- (iv) Incorrect

### Final Answer:
The correct statements are (i) and (iii).

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