Q. Atmospheric refraction is _________

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Q. Which of the following is an instrumental error?

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Q. Which of the following is not a natural error?

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Q. Which of the following is not a principle source of error in levelling?

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Q. Errors in sighting is _________

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Q. Wind vibrations are natural errors.

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Q. When distances are small which of the following error is negligible?

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Q. Due to refraction, staff reading decreases.

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Q. The degree of precision does not depend upon the type of instrument.

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Q. For a given instrument and atmospheric conditions, the precision depends upon the number of setups.

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Q. The precision on plains will be less than that on hills.

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Q. The degree of precision depends upon the skill of an observer.

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Q. What is the error in feet for rough levelling for reconnaissance or preliminary surveys?

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Q. What is the error in feet for ordinary levelling for location and construction surveys?

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Q. What is the error in feet for accurate levelling for principal benchmarks or for extensive surveys?

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Q. What is the error in feet for precise levelling for benchmarks of widely distributed points?

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Q. What is the error in mm for rough levelling for reconnaissance or preliminary surveys?

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Q. What is the error in mm for ordinary levelling for location and construction surveys?

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Q. What is the error in mm for accurate levelling for principal benchmarks or for extensive surveys?

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Q. What is the error in mm for precise levelling for benchmarks of widely distributed points?

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