This question was previously asked in

UP Jal Nigam Civil 2016 Official Paper

Option 3 : 150

__Concept:__

Metric chains are available in 5 m, 10 m, 20 m, and 30 m.

In the metric chain for 1 m length 5 links are present.

For 30 m metric chain, Number of links = 30 × 5 = **150 links**

**Following are the various types of chain in common use in surveying:**

Type | Length | No. of links | Length of one link |

Metric chain | 20 m or 30 m | 100 or 150 | 20 cm |

Engineering chain | 100 ft | 100 | 1 ft |

Gunter chain | 66 ft | 100 | 0.66 ft |

Revenue chain | 33 ft | 16 | \(2\frac{1}{{16}}\) |