विद्युत चुंबकीय तरंगों (जैसे जियोडीमीटर) या ऑप्टिकल विधियों (जैसे टैकोमेट्री) का उपयोग करने वाले उपकरणों द्वारा मापी गई दूरियां किस मापन श्रेणी के अंतर्गत आती हैं?

Select the odd option with respect to natural/instrumental sources of error in transit theodolite work.

Which of the following types of leveling is also known as fly leveling?

Which of the following statement(s) about the rise and fall method in levelling is/are correct? Statement I: This method requires calculation of the height of instrument at every station. Statement II: The difference between a back sight and fore sight indicates a rise or fall. Statement III: The method provides an arithmetic check using the sums of back sights, fore sights, rises, and falls.