Q1: Pick up the correct statement from the following :

ANS:D - all the above.

1. Mistakes arise from inattention, inexperience, or carelessness: Mistakes in surveying can occur when individuals are not fully focused on their tasks (inattention), lack the necessary skills or knowledge (inexperience), or fail to take proper precautions (carelessness). These mistakes can lead to inaccuracies in measurements, incorrect data recording, or other errors in surveying work.
2. Systematic errors persist and have regular effects on survey performances: Systematic errors are consistent and repeatable errors that affect survey measurements in a predictable manner. These errors can stem from instrument calibration issues, environmental factors, or other systematic sources. Unlike random errors, systematic errors persist across multiple measurements and can lead to biases in survey results.
3. Accidental errors occur despite every precaution taken: Accidental errors are random and unpredictable errors that can occur despite careful planning and precautionary measures. These errors may result from unforeseen circumstances, equipment malfunctions, human errors, or environmental conditions beyond the surveyor's control. Accidental errors can introduce variability and uncertainty into survey measurements, even when best practices are followed.

Each of these statements highlights different aspects of errors encountered in surveying practices, emphasizing the importance of attention to detail, experience, and rigorous quality control measures to minimize errors and ensure the accuracy and reliability of survey data.