The function of a bearing is to _____________ & ______________ a shaft with minimum friction.

• A. Guide, Rotate
• B. Support, Guide
• C. Stop, Align
• D. Support, Isolate

Answer: (B)

The main idea is that a bearing both supports the shaft and guides its motion, while keeping friction as low as possible. A bearing carries the load from the shaft and provides a stable axis for rotation, so the shaft remains properly aligned while it turns. The “guide” part ensures the shaft stays on the correct path and maintains alignment, which reduces wear and keeps the system running smoothly. The low friction comes from the bearing’s rolling contact (in ball or roller bearings) or well-lubricated sliding surfaces, which lets the shaft rotate with minimal resistance.

The other options don’t fit as well: bearings don’t inherently stop motion or isolate the shaft—those are not their primary roles, and while alignment is related, the essential pair is to support the shaft and guide its rotation with low friction.