In which of the following process, convection does not take place primarily?
(a) Sea and land breeze
(b)Boiling of water
(c) Warming of glass of bulb due ot filament
(d) Heating air around a furnace

Explanation

To solve the question regarding which process does not primarily involve convection, we will analyze each option step by step.

### Step 1: Analyze Sea and Land Breeze
- **Explanation**: Sea and land breezes occur due to differential heating of land and water. During the day, land heats up faster than the sea, causing the air above the land to rise and creating a low-pressure area. Cooler air from the sea moves in to replace it, creating a breeze. This process involves the movement of air, which is a characteristic of convection.
- **Conclusion**: This process primarily involves convection.

### Step 2: Analyze Boiling of Water
- **Explanation**: When water is heated, the water at the bottom of the pot becomes less dense and rises, while cooler, denser water descends. This creates a circulation pattern in the water, which is a clear example of convection.
- **Conclusion**: This process primarily involves convection.

### Step 3: Analyze Warming of Glass of Bulb Due to Filament
- **Explanation**: When the filament in a bulb heats up, it emits infrared radiation. The glass of the bulb warms up due to this radiation. There is no movement of fluid (air or otherwise) that transfers heat in this case; the heat transfer occurs through radiation.
- **Conclusion**: This process does not primarily involve convection; it primarily involves radiation.

### Step 4: Analyze Heating Air Around a Furnace
- **Explanation**: A furnace heats the air around it, causing the warm air to rise and cooler air to move in to take its place. This movement of air is a characteristic of convection.
- **Conclusion**: This process primarily involves convection.

### Final Answer
Based on the analysis, the process in which convection does not take place primarily is:
**(c) Warming of glass of bulb due to filament.**

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