{"id":329,"date":"2020-09-15T12:13:42","date_gmt":"2020-09-15T07:13:42","guid":{"rendered":"https:\/\/talib.pk\/test-preparation\/?p=329"},"modified":"2020-09-15T12:13:42","modified_gmt":"2020-09-15T07:13:42","slug":"physics-chapter-19-2nd-year-dawn-of-modern-physics-mcqs-with-answers","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/physics-chapter-19-2nd-year-dawn-of-modern-physics-mcqs-with-answers\/","title":{"rendered":"Physics Chapter 19 2nd Year Dawn of Modern Physics MCQs with Answers"},"content":{"rendered":"<div class=\"28d95f43054b69d67289d6316e9506d8\" data-index=\"1\" style=\"float: none; margin:12px 0 12px 0; text-align:center;\">\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- talib-new -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3438155045791616\"\r\n     data-ad-slot=\"6774242552\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>After studying different electric circuits, now we are heading towards Modern Physics and we will study Physics Chapter 19 2nd Year Dawn of Modern Physics MCQs with Answers. First of all, we will compare Modern and Classical Physics. The most important term is the Frame of Reference that includes inertial and non-inertial frames. The theory of Relativity deals with the inertial frame of reference. NAVSTAR is the modern Navigation Satellite and it uses a special theory of relativity results. Then we will study the Black Body Radiation. Light travels with a wavelength that consists of a beam stream of photons. So, we will study the Photon theory of light and the Photoelectric effect. Einstein also gave an equation of the Photoelectric Effect. An application of the Photoelectric effect is Photo Cell. There are some important terms Compton Effect, Pair Production, Annihilation of Matter, De-Broglie\u2019s Hypothesis, Davisson and Germer Experiment, and Heisenberg\u2019s Uncertainty Principle that we will study in this chapter. So, this is a brief intro about the 2nd Year Physics Chapter 19 Dawn of Modern Physics.<\/p>\n<h2 style=\"text-align: center;\">Physics Chapter 19 2nd Year Dawn of Modern Physics MCQs with Answers<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-330 aligncenter\" src=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-6.jpg\" alt=\"Physics Chapter 19 2nd Year Dawn of Modern Physics MCQs with Answers\" width=\"300\" height=\"300\" srcset=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-6.jpg 300w, https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2020\/09\/Physics-2nd-Year-MCQs-6-150x150.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n\n    <!-- Custom CSS for Quiz -->\n    <style type=\"text\/css\">\n\n    \/* Fixes *\/\n    #advq_quiz_303 ul.advq_question_list {\n        padding:10px 0;\n        margin:0;\n    }\n\n    #advq_quiz_303 {\n       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data-quiz-id='303' id='advq_quiz_303' data-qtype='trivia' data-qlayout='minimal' data-unique-visitor='6aa73ff88a077' data-start-time='1789345785' data-options='{\"provide_result\":false,\"allow_change\":false,\"result_position\":\"inline\",\"one_page\":true,\"scroll_to_next\":false,\"progress_bar\":\"disabled\",\"back_button\":false,\"list_mode\":false,\"relation\":\"AND\"}'><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-13\" >The momentum of a photon is 3.3x10^-29 kgm\/sec. Its frequency will be:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-13\"><li class=\"quiz_unselected_answer\"><input data-value='3x 10^3 Hz' data-rule='0' id='question-13_0' name='question-13' type='radio' data-points='1'> <label for='question-13_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>3x 10^3 Hz<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='7.5 x10^12 Hz' data-rule='0' id='question-13_1' name='question-13' type='radio' data-points='1'> <label for='question-13_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>7.5 x10^12 Hz<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='1.5x 10^13 Hz' data-rule='1' id='question-13_2' name='question-13' type='radio' data-points='1'> <label for='question-13_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>1.5x 10^13 Hz<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='6 x10^3 Hz' data-rule='0' id='question-13_3' name='question-13' type='radio' data-points='1'> <label for='question-13_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>6 x10^3 Hz<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-5\" >The velocity of a particle of mass m of de-Broglie wavelength \u03bb is:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-5\"><li class=\"quiz_unselected_answer\"><input data-value='m &lambda;c^2\/h' data-rule='0' id='question-5_0' name='question-5' type='radio' data-points='1'> <label for='question-5_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>m \u03bbc^2\/h<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2m &lambda;c^2' data-rule='0' id='question-5_1' name='question-5' type='radio' data-points='1'> <label for='question-5_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2m \u03bbc^2<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='h\/m &lambda;' data-rule='1' id='question-5_2' name='question-5' type='radio' data-points='1'> <label for='question-5_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>h\/m \u03bb<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2h\/m&lambda;' data-rule='0' id='question-5_3' name='question-5' type='radio' data-points='1'> <label for='question-5_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2h\/m\u03bb<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-9\" >The speed of photon:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-9\"><li class=\"quiz_unselected_answer\"><input data-value='Must be less than speed of light ' data-rule='0' id='question-9_0' name='question-9' type='radio' data-points='1'> <label for='question-9_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Must be less than speed of light <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Must be equal to speed of light ' data-rule='1' id='question-9_1' name='question-9' type='radio' data-points='1'> <label for='question-9_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Must be equal to speed of light <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='May be greater than speed of light ' data-rule='0' id='question-9_2' name='question-9' type='radio' data-points='1'> <label for='question-9_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>May be greater than speed of light <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='May be less than speed of light ' data-rule='0' id='question-9_3' name='question-9' type='radio' data-points='1'> <label for='question-9_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>May be less than speed of light <\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-15\" >The length of meter rod moving with velocity equal to 3x108ms-1 appears to an observer at rest as:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-15\"><li class=\"quiz_unselected_answer\"><input data-value='&frac14; m' data-rule='0' id='question-15_0' name='question-15' type='radio' data-points='1'> <label for='question-15_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>\u00bc m<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='zero' data-rule='1' id='question-15_1' name='question-15' type='radio' data-points='1'> <label for='question-15_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>zero<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='1m ' data-rule='0' id='question-15_2' name='question-15' type='radio' data-points='1'> <label for='question-15_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>1m <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='1\/2m' data-rule='0' id='question-15_3' name='question-15' type='radio' data-points='1'> <label for='question-15_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>1\/2m<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-12\" >If n number of photon are striking on a metal surface, then total momentum exerted is:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-12\"><li class=\"quiz_unselected_answer\"><input data-value='nf x t' data-rule='0' id='question-12_0' name='question-12' type='radio' data-points='1'> <label for='question-12_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>nf x t<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='zero' data-rule='0' id='question-12_1' name='question-12' type='radio' data-points='1'> <label for='question-12_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>zero<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='nh\/ &lambda;' data-rule='1' id='question-12_2' name='question-12' type='radio' data-points='1'> <label for='question-12_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>nh\/ \u03bb<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='2nh&lambda;' data-rule='0' id='question-12_3' name='question-12' type='radio' data-points='1'> <label for='question-12_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>2nh\u03bb<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-4\" >Davison Germer experiment indicates:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-4\"><li class=\"quiz_unselected_answer\"><input data-value='Electron diffraction' data-rule='1' id='question-4_0' name='question-4' type='radio' data-points='1'> <label for='question-4_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Electron diffraction<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Interference' data-rule='0' id='question-4_1' name='question-4' type='radio' data-points='1'> <label for='question-4_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Interference<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Refraction' data-rule='0' id='question-4_2' name='question-4' type='radio' data-points='1'> <label for='question-4_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Refraction<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Polarization' data-rule='0' id='question-4_3' name='question-4' type='radio' data-points='1'> <label for='question-4_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Polarization<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-11\" >Dual nature of radiation is given by: <\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-11\"><li class=\"quiz_unselected_answer\"><input data-value='Diffraction and reflection' data-rule='0' id='question-11_0' name='question-11' type='radio' data-points='1'> <label for='question-11_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Diffraction and reflection<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Refraction and diffraction' data-rule='0' id='question-11_1' name='question-11' type='radio' data-points='1'> <label for='question-11_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Refraction and diffraction<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Photoelectric effect alone' data-rule='0' id='question-11_2' name='question-11' type='radio' data-points='1'> <label for='question-11_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Photoelectric effect alone<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='Photoelectric effect and diffraction' data-rule='1' id='question-11_3' name='question-11' type='radio' data-points='1'> <label for='question-11_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>Photoelectric effect and diffraction<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-10\" >Wave is associated with matter:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-10\"><li class=\"quiz_unselected_answer\"><input data-value='When it is stationary ' data-rule='0' id='question-10_0' name='question-10' type='radio' data-points='1'> <label for='question-10_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>When it is stationary <\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='None of these' data-rule='0' id='question-10_1' name='question-10' type='radio' data-points='1'> <label for='question-10_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>None of these<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='When it is motion with the velocity of light only' data-rule='0' id='question-10_2' name='question-10' type='radio' data-points='1'> <label for='question-10_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>When it is motion with the velocity of light only<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='When it is in motion with any velocity' data-rule='1' id='question-10_3' name='question-10' type='radio' data-points='1'> <label for='question-10_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>When it is in motion with any velocity<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-7\" >Mass of a photon of frequency f is given by:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-7\"><li class=\"quiz_unselected_answer\"><input data-value='m=hf\/c^2' data-rule='0' id='question-7_0' name='question-7' type='radio' data-points='0'> <label for='question-7_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>m=hf\/c^2<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='m=hf^2\/c' data-rule='0' id='question-7_1' name='question-7' type='radio' data-points='0'> <label for='question-7_1'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>m=hf^2\/c<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='m=hf\/c' data-rule='0' id='question-7_2' name='question-7' type='radio' data-points='0'> <label for='question-7_2'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>m=hf\/c<\/label><\/li><li class=\"quiz_unselected_answer\"><input data-value='m=h\/ &lambda;' data-rule='0' id='question-7_3' name='question-7' type='radio' data-points='0'> <label for='question-7_3'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" aria-hidden=\"true\"><\/i><\/span>m=h\/ \u03bb<\/label><\/li><\/ul><\/div><\/div><div  data-mandatory=\"\" class=\"advq_question_container \" ><div class=\"advq_question_wrap\"><div class=\"advq_question\" data-question-id=\"question-6\" >The resolution of 50KV electron microscope is:<\/div><ul data-priority=\"normal\" data-type=\"radio\" data-relation=\"ignore\" class=\"advq_question_list\" data-question-id=\"question-6\"><li class=\"quiz_unselected_answer\"><input data-value='0.2 nm' data-rule='0' id='question-6_0' name='question-6' type='radio' data-points='1'> <label for='question-6_0'><span class=\"advq_a_input\"><i class=\"fa fa-square-o\" 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Answers. First of all, we will compare Modern and Classical Physics. The most important term is the Frame of Reference that includes inertial and non-inertial frames. 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