{"id":8176,"date":"2024-04-15T02:56:15","date_gmt":"2024-04-15T02:56:15","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=8176"},"modified":"2024-04-15T02:56:15","modified_gmt":"2024-04-15T02:56:15","slug":"which-of-the-following-errors-cannot-be-eliminated-by-taking-both-face-observations-a-error-due-to-horizontal-axis-not-being-perpendicular-to-the-vertical-axis-b-index-error-i-e-error-due-to-impe","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-errors-cannot-be-eliminated-by-taking-both-face-observations-a-error-due-to-horizontal-axis-not-being-perpendicular-to-the-vertical-axis-b-index-error-i-e-error-due-to-impe\/","title":{"rendered":"Which of the following errors cannot be eliminated by taking both face observations ? A. error due to horizontal axis not being perpendicular to the vertical axis B. index error i.e. error due to imperfect adjustment of the vertical circle vernier C. error due to non-parallelism of the axis of telescope level and line of collimation D. none of the above"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a9bb0caa9be8\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"true\">\r\n                    error due to horizontal axis not being perpendicular to the vertical axis                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    index error i.e. error due to imperfect adjustment of the vertical circle vernier                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    error due to non-parallelism of the axis of telescope level and line of collimation                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    none of the above                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is: A. error due to horizontal axis not being perpendicular to the vertical axis.<\/p>\n<p>The other options are errors that can be eliminated by taking both face observations.<\/p>\n<ul>\n<li>Index error is the error due to imperfect adjustment of the vertical circle vernier. It can be eliminated by taking the mean of the two face observations.<\/li>\n<li>Error due to non-parallelism of the axis of telescope level and line of collimation can be eliminated by taking the mean of the two face observations.<\/li>\n<\/ul>\n<p>The error due to horizontal axis not being perpendicular to the vertical axis cannot be eliminated by taking both face observations. This is because the error is caused by the misalignment of the horizontal axis and the vertical axis of the theodolite. When the theodolite is set up, the horizontal axis should be perpendicular to the vertical axis. However, due to manufacturing errors or improper setup, the horizontal axis may not be perfectly perpendicular to the vertical axis. This will cause an error in the <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div> 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> measurement of the angle between two lines. The error will be the same for both face observations, so it cannot be eliminated by taking the mean of the two face observations.<\/p>\n<p>To eliminate this error, the theodolite should be checked for proper alignment. If the horizontal axis is not perpendicular to the vertical axis, the theodolite should be adjusted or repaired.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[654],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which of the following errors cannot be eliminated by taking both face observations ? 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