{"id":129,"date":"2019-10-02T14:19:38","date_gmt":"2019-10-02T14:19:38","guid":{"rendered":"https:\/\/talib.pk\/test-preparation\/?p=129"},"modified":"2019-10-02T14:19:38","modified_gmt":"2019-10-02T14:19:38","slug":"1st-year-physics-chapter-09-physical-optics-mcqs-with-answers","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/1st-year-physics-chapter-09-physical-optics-mcqs-with-answers\/","title":{"rendered":"1st Year Physics Chapter 09 Physical Optics 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>1st Year Physics Chapter 09 Physical Optics Mcqs With Answers, In Chapter 9 behavior of optics has been discussed. Wavefront is an important factor in optics. It is discussed by the Huygens principle. Optics also shows Interference. It is further explained by Young&#8217;s Double Slit Experiment. Newton also worked on these principles. Light shows diffraction on optics. Diffraction is also shown by Narrow Slit, Diffraction Grating and by crystals. The phenomenon of polarization is also seen in optics.<\/p>\n<p>&nbsp;<\/p>\n<h3>1st Year Physics Chapter 09 Key Points<\/h3>\n<div class=\"box info  alignleft\" style=\"width:100%\"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\t\n<div class=\"lightbulb tie-list-shortcode\">\n<ul>\n<li>Waterfronts<\/li>\n<li>Huygens Principle<\/li>\n<li>Interference of Light Waves&#8217;<\/li>\n<li>Young&#8217;s Double Slit Experiment<\/li>\n<li>Interference in Thin Film<\/li>\n<li>Newton&#8217;s Rings<\/li>\n<li>Michelson Interferometer<\/li>\n<li>Diffraction of light<\/li>\n<li>Diffraction Grating<\/li>\n<li>Diffraction of X-rays by Crystals<\/li>\n<li>Polarization<\/li>\n<\/ul>\n<\/div>\n\t\t\t<\/div><\/div>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\">1st Year Physics Chapter 09 Physical Optics Mcqs With Answers<\/h2>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff6600;\">Question#1<\/span>. Optically active crystals rotate the?<\/strong><\/p>\n<ul>\n<li>Vibrating plane<\/li>\n<li>Polarization plane<\/li>\n<li>Diffraction plane<\/li>\n<li>Interference plane<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Polarization plane<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#2<\/span>. Which is not an optically active substance?<\/strong><\/p>\n<ul>\n<li>Sugar<\/li>\n<li>Tartaric acid<\/li>\n<li>Water<strong><br \/>\n<\/strong><\/li>\n<li>Sodium chlorate<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Water<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#3<\/span>. In double slit experiment, we observe?<\/strong><\/p>\n<ul>\n<li>Interference fringes only<\/li>\n<li>Diffraction fringes only<\/li>\n<li>Both interference and diffraction fringes<\/li>\n<li>Polarized fringes<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Both interference and diffraction fringes<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#4<\/span>. When light incident normally on thin film, the path difference depends upon?<\/strong><\/p>\n<ul>\n<li>Thickness of the film only<\/li>\n<li>Nature of the film only<\/li>\n<li>The angle of incidence only<\/li>\n<li>All thickness, nature, and angle of incidence<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>All thickness, nature and angle of incidence<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#5<\/span>. Which one of the following properties of light does not change with the nature of the medium?<\/strong><\/p>\n<ul>\n<li>Velocity<\/li>\n<li>Wavelength<\/li>\n<li>Amplitude<\/li>\n<li>Frequency<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Frequency<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#6<\/span>. Huygen wave theory explain?<\/strong><\/p>\n<ul>\n<li>Diffraction<\/li>\n<li>Interference<\/li>\n<li>Polarization<\/li>\n<li>Photoelectric effect<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Photoelectric effect<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#7<\/span>. The photoelectric effect was explained by?<\/strong><\/p>\n<ul>\n<li>Hertz<\/li>\n<li>Fresnel<\/li>\n<li>Einstein<\/li>\n<li>Plank<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Einstein<\/strong>\n\t\t\t<\/div><\/div>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff6600;\">Question#8<\/span>. According to Einstein, light travels from one place to another in the form of?<\/strong><\/p>\n<ul>\n<li>Waves<\/li>\n<li>Particles<\/li>\n<li>Photons<strong><br \/>\n<\/strong><\/li>\n<li>It was not his discovery<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Photons<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#9<\/span>. Longitudinal waves do not exhibit?<\/strong><\/p>\n<ul>\n<li>Reflection<\/li>\n<li>Refraction<\/li>\n<li>Diffraction<\/li>\n<li>Polarization<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Polarization<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#10<\/span>. Signal from the T.V remote control travels:<\/strong><\/p>\n<ul>\n<li>With speed of sound<\/li>\n<li>With the speed of light<\/li>\n<li>With the speed of ultrasonic<\/li>\n<li>With the speed of supersonic<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>With the speed of light<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#11<\/span>. A point source of light placed in a homogenous medium gives rise to?<\/strong><\/p>\n<ul>\n<li>A cylindrical wavefront<\/li>\n<li>An elliptical wavefront<\/li>\n<li>Spherical wavefront<\/li>\n<li>A plane wavefront<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>A spherical wave front<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#12<\/span>. The locus of all points in a medium having the same phase of vibration is called?<\/strong><\/p>\n<ul>\n<li>Crest<\/li>\n<li>Trough<\/li>\n<li>Wavelength<\/li>\n<li>Wavefront<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Wave front<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#13<\/span>. Which one of the following is nearly monochromatic light?<\/strong><\/p>\n<ul>\n<li>Light from a fluorescent tube<\/li>\n<li>Light from a mercury lamp<\/li>\n<li>Light from a sodium lamp<\/li>\n<li>Light from a simple lamp<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Light from sodium lamp<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#14<\/span>. Two sources of light are coherent if they emit rays of?<\/strong><\/p>\n<ul>\n<li>Same wavelength<\/li>\n<li>The same amplitude of vibration<\/li>\n<li>Same wavelength with a constant phase difference<\/li>\n<li>Same amplitude and wavelength<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Same wave length with constant phase difference<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#15<\/span>. When the crest of one wave falls over the trough of the other wave, this phenomenon is known as?<\/strong><\/p>\n<ul>\n<li>Polarization<\/li>\n<li>Constructive interference<\/li>\n<li>Destructive interference<\/li>\n<li>Diffraction<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Destructive interference<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#16<\/span>. In Young\u2019s double slit experiment, the fringe spacing is equal to (d=slit separation and D = distance of the screen from slits):<\/strong><\/p>\n<ul>\n<li>d\u03bbD<\/li>\n<li>2\u03bbd\/D<\/li>\n<li>\u03bbD\/d<\/li>\n<li>\u03bbd\/D<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>\u03bbD\/d<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#17<\/span>. In the Young double-slit experiment, if white light is used?<\/strong><\/p>\n<ul>\n<li>Alternate dark and bright fringes will be seen<\/li>\n<li>Coloured fringes will be seen<\/li>\n<li>No interference fringes will be seen<\/li>\n<li>Impossible to predict<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Coloured fringes will be seen<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#18<\/span>. The velocity of light was determined accurately by?<\/strong><\/p>\n<ul>\n<li>Newton<\/li>\n<li>Michelson<\/li>\n<li>Huygen<\/li>\n<li>Young<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Michelson<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#19<\/span>. The condition of constructive interference of two coherent beams is that the path difference should be?<\/strong><\/p>\n<ul>\n<li>Integral multiple of \u03bb\/2<\/li>\n<li>Integral multiple of \u03bb<\/li>\n<li>Odd integral multiple of \u03bb\/2<\/li>\n<li>Even integral multiple of \u03bb<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Integral multiple of \u03bb<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#20<\/span>. In an interference pattern:<\/strong><\/p>\n<ul>\n<li>Bright fringes are wider than dark fringes<\/li>\n<li>Dark fringes are wider than bright fringe<\/li>\n<li>Both dark and bright fringes are equal width<\/li>\n<li>Central fringes are dimmer than the outer fringes<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Both dark and bright fringes are equal width<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#21<\/span>. In Young\u2019s double-slit experiment, the separation between the slit is halved and the distance between the slit and screen is doubled. The fringe width is:<\/strong><\/p>\n<ul>\n<li>Remain the same<\/li>\n<li>Double<\/li>\n<li>Half<\/li>\n<li>Quadrupled<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Quadrupled<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#22<\/span>. The blue color of the sky is due to?<\/strong><\/p>\n<ul>\n<li>Diffraction<\/li>\n<li>Reflection<\/li>\n<li>Polarization<\/li>\n<li>Scattering<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Scattering<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#23<\/span>. A light ray traveling from denser to rarer medium suffers a phase change of?<\/strong><\/p>\n<ul>\n<li>0\u00b0<\/li>\n<li>90\u00b0<\/li>\n<li>180\u00b0<\/li>\n<li>45\u00b0<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>0\u00b0<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#24<\/span>. When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm, we observe 2000 fringes. What will be a wavelength of light used?<\/strong><\/p>\n<ul>\n<li>5000nm<\/li>\n<li>5000A<strong>\u00b0<br \/>\n<\/strong><\/li>\n<li>500m<\/li>\n<li>2000\u03bcm<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>5000A\u00b0<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#25<\/span>. Diffraction effect is:<\/strong><\/p>\n<ul>\n<li>More for round edge<\/li>\n<li>Less for round edge<\/li>\n<li>More for a sharp edge<\/li>\n<li>Less for a sharp edge<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>More for a sharp edge<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#26<\/span>. The wavelength of X &#8211; rays is of the order of?<\/strong><\/p>\n<ul>\n<li>10A\u00b0<\/li>\n<li>1000A\u00b0<\/li>\n<li>1A\u00b0<\/li>\n<li>100A\u00b0<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>1A\u00b0<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#27<\/span>. The wavelength of X-rays falling at a glancing angle of 30\u00b0 on a crystal with atomic spacing 2 x 10<sup>-10<\/sup>m for the first-order diffraction is?<\/strong><\/p>\n<ul>\n<li>4&#215;10<sup>-10<\/sup>m<\/li>\n<li>2&#215;10<sup>-10<\/sup>m<\/li>\n<li>0.02&#215;10<sup>-10<\/sup>m<\/li>\n<li>20&#215;10<sup>-10<\/sup>m<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>2&#215;10<sup>-10<\/sup>m<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#28<\/span>. A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to?<\/strong><\/p>\n<ul>\n<li>500mm<\/li>\n<li>5&#215;10<sup>-3<\/sup>mm<\/li>\n<li>2&#215;10<sup>-5<\/sup>mm<\/li>\n<li>2&#215;10<sup>-3<\/sup>mm<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>2&#215;10<sup>-3<\/sup>mm<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#29<\/span>. In a plane-polarized light electric vibration are:<\/strong><\/p>\n<ul>\n<li>In all direction<\/li>\n<li>In two mutually perpendicular directions<\/li>\n<li>Taking place perpendicular to the direction of propagation of light<\/li>\n<li>No vibration at all<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Taking place perpendicular to the direction of propagation of light<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#30<\/span>. Light on passing through a Polaroid is?<\/strong><\/p>\n<ul>\n<li>Plane polarized<\/li>\n<li>Un-polarized<\/li>\n<li>Circularly polarized<\/li>\n<li>Elliptically polarized<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Plane polarized<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#31<\/span>. Which one of the following cannot be polarized?<\/strong><\/p>\n<ul>\n<li>Radio waves<\/li>\n<li>Ultraviolet rays<\/li>\n<li>X-rays<\/li>\n<li>Ultrasonic waves<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Ultrasonic waves<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#32<\/span>. A compact disc having rulings of 0.5 \u03bcm each wide shows colors under white light due to?<\/strong><\/p>\n<ul>\n<li>Equally spaced<\/li>\n<li>Distance between them increases<\/li>\n<li>Distance between them does not remain constant<\/li>\n<li>They are adjacent with no space in between<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Distance between them not remain constant<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#33<\/span>. In monochromatic red light, a blue book will probably appear to be?<\/strong><\/p>\n<ul>\n<li>Black<strong><br \/>\n<\/strong><\/li>\n<li>Purple<\/li>\n<li>Green<\/li>\n<li>No scientific reasoning available<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Black<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#34<\/span>. A polarizer is used to?<\/strong><\/p>\n<ul>\n<li>Reduce the intensity of light<\/li>\n<li>Produce polarized light<\/li>\n<li>Increase intensity of light<\/li>\n<li>Both a and b<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Both a and b<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#35<\/span>. In a double-slit experiment, if one of the two-slit is covered then?<\/strong><\/p>\n<ul>\n<li>No interference fringes are observed<\/li>\n<li>No diffraction fringes are observed<\/li>\n<li>No fringes observed<\/li>\n<li>Interference pattern not disturbed<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>No interference fringes are observed<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#36<\/span>. ________ gives the definition of a metre in terms of the wavelength of red cadmium light.<\/strong><\/p>\n<ul>\n<li>Newton<\/li>\n<li>Einstein<\/li>\n<li>Michelson<\/li>\n<li>Galileo<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Michelson<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#37<\/span>. In Michelson interferometer to switch the fringe from bright to dark the mirror should be displaced through?<br \/>\n<\/strong><\/p>\n<ul>\n<li>\u03bb\/(b)<\/li>\n<li>\u03bb\/3<\/li>\n<li>\u03bb\/6<\/li>\n<li>\u03bb\/4<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>\u03bb\/4<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#38<\/span>. In the shadow of a ball the central portion appears bright that happens due to?<\/strong><\/p>\n<ul>\n<li>Interference<\/li>\n<li>Diffraction<\/li>\n<li>Polarization<\/li>\n<li>Refraction<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Diffraction<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#39<\/span>. Which experiment shows that wavelength of light is smaller than that of sound?<\/strong><\/p>\n<ul>\n<li>Diffraction<\/li>\n<li>Polarization<\/li>\n<li>Interference<\/li>\n<li>Reflection<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Diffraction<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#40<\/span>. Crystals of material can behave as?<\/strong><\/p>\n<ul>\n<li>Convex lens<\/li>\n<li>Interferometer<\/li>\n<li>Diffraction grating<\/li>\n<li>Concave<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Diffraction grating<\/strong>\n\t\t\t<\/div><\/div>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>1st Year Physics Chapter 09 Physical Optics Mcqs With Answers, In Chapter 9 behavior of optics has been discussed. Wavefront is an important factor in optics. It is discussed by the Huygens principle. Optics also shows Interference. It is further explained by Young&#8217;s Double Slit Experiment. Newton also worked on these principles. Light shows diffraction &hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/129"}],"collection":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":0,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/129\/revisions"}],"wp:attachment":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media?parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/categories?post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/tags?post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}