{"id":134,"date":"2019-10-02T20:00:02","date_gmt":"2019-10-02T20:00:02","guid":{"rendered":"https:\/\/talib.pk\/test-preparation\/?p=134"},"modified":"2019-10-02T20:36:37","modified_gmt":"2019-10-02T15:36:37","slug":"1st-year-physics-chapter-10-optical-instruments-mcqs-with-answers","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/1st-year-physics-chapter-10-optical-instruments-mcqs-with-answers\/","title":{"rendered":"1st Year Physics Chapter 10 Optical Instruments 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 10 Optical Instruments Mcqs With Answers is about optical instruments based on principles of Reflection and Refraction. Every optical instrument has its own magnifying and resolving power. For the purpose of viewing small objects, a microscope is used. Different microscopes are used for different purposes. An Astronomical Telescope is used to see distant objects. In order to study spectra of different light sources, Spectrometer is used.\u00a0 Fibre optic is a very thin wire used to send information within a form of light. It is also used to send sound waves. But the information can be lost in fibre optics due to some defects.<\/p>\n<h3>1st Year Physics Chapter 10 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>Magnifying power and resolving power of Optical Instruments<\/li>\n<li>Simple Microscope<\/li>\n<li>Compound Microscope<\/li>\n<li>Astronomical Telescope<\/li>\n<li>Spectrometer<\/li>\n<li>Speed of light<\/li>\n<li>Fibre Optics \/ its principle\/ its types<\/li>\n<li>Signal Transmission and conversion of sound<\/li>\n<li>Losses of power<\/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 10 Optical Instruments Mcqs<\/h2>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff6600;\">Question#1<\/span>. Large astronomical telescopes are of which type?<\/strong><\/p>\n<ul>\n<li>Refraction<\/li>\n<li>Reflection<\/li>\n<li>Diffraction<\/li>\n<li>Dispersing<\/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>Reflection<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#2<\/span>. A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called?<\/strong><\/p>\n<ul>\n<li>Center of curvature<\/li>\n<li>Focus<\/li>\n<li>Optical center<\/li>\n<li>Aperture<\/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>Focus<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#3<\/span>. Who invented photophone?<\/strong><\/p>\n<ul>\n<li>Graham Bell<\/li>\n<li>Galileo<\/li>\n<li>Torricelli<\/li>\n<li>Maxwell<\/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>Graham Bell<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#4<\/span>. In going from a denser to rare medium a ray of light is?<\/strong><\/p>\n<ul>\n<li>Undaviated<\/li>\n<li>Bent away from the normal<\/li>\n<li>Bent towards the normal<\/li>\n<li>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>Bent away from the normal<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#5<\/span>. Typical fibre optic communication system uses the light of which wavelength?<\/strong><\/p>\n<ul>\n<li>1.3\u03bcm<strong><br \/>\n<\/strong><\/li>\n<li>1.3nm<\/li>\n<li>13\u03bcm<\/li>\n<li>13nm<\/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>1.3\u03bcm<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#6<\/span>. The diamond shines due to:<\/strong><\/p>\n<ul>\n<li>Interference<\/li>\n<li>Diffraction<\/li>\n<li>Scattering<\/li>\n<li>Total internal 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>Total internal reflection<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#7<\/span>. If a lens is covered with wax then?<\/strong><\/p>\n<ul>\n<li>Intensity becomes double<\/li>\n<li>The image will not formed<\/li>\n<li>Intensity will remain the same<\/li>\n<li>Intensity will become half<\/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>Intensity will become half<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#8<\/span>. The minimum distance between an object and its real image in a convex lens is:<\/strong><\/p>\n<ul>\n<li>2 f<\/li>\n<li>2.5 f<\/li>\n<li>3 f<\/li>\n<li>4 f<\/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>4 f<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#9<\/span>. If an object is placed away from \u20182f\u2019 of a converging lens, then the image will be?<\/strong><\/p>\n<ul>\n<li>Real and erect<\/li>\n<li>Virtual and erect<\/li>\n<li>Real and inverted<\/li>\n<li>Virtual<\/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>Real and inverted<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#10<\/span>. If the length of the telescope is 96cm the focal lengths of its lenses is:<\/strong><\/p>\n<ul>\n<li>100cm, -4cm<\/li>\n<li>-80cm, -6cm<\/li>\n<li>90cm, -6cm<\/li>\n<li>90cm, 6cm<\/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>90cm, -6cm<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#11<\/span>. The magnifying power of a simple microscope:<\/strong><\/p>\n<ul>\n<li>Increase with increase in focal length<\/li>\n<li>Increase with decrease in focal length<\/li>\n<li>No effect with decrease or increase with the focal length<\/li>\n<li>List distance of distinct vision<\/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>Increase with decrease in focal length<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#12<\/span>. Image of an object 5 mm high is only 1 cm high. Magnification produced by a lens is:<\/strong><\/p>\n<ul>\n<li>0.5<\/li>\n<li>0.2<\/li>\n<li>1<\/li>\n<li>2<\/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<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#13<\/span>. The speed of light in the medium of the refractive index of 1.5 is?<\/strong><\/p>\n<ul>\n<li>2&#215;10<sup>8<\/sup>ms<sup>-1<\/sup><\/li>\n<li>3&#215;10<sup>8<\/sup>ms<sup>-1<\/sup><\/li>\n<li>0.5&#215;10<sup>8m<\/sup>ms<sup>-1<\/sup><\/li>\n<li>1.5&#215;10<sup>8<\/sup>ms<sup>-1<\/sup><\/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>8<\/sup>ms<sup>-1<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#14<\/span>. Least distance of distinct vision of normal and healthy people:<\/strong><\/p>\n<ul>\n<li>Increases with increase in age<\/li>\n<li>Decreases with increase in age<\/li>\n<li>Neither increases nor decreases<\/li>\n<li>Becomes infinite after 60 years<\/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>Increases with increase in age<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#15<\/span>. In a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from?<\/strong><\/p>\n<ul>\n<li>Chromatic aberration<\/li>\n<li>Spherical aberration<\/li>\n<li>Both spherical and chromatic<\/li>\n<li>Distortion<\/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>Spherical aberration<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#16<\/span>. Two convex lenses of equal focal length \u2018f\u2019 are placed in contact, the resultant focal length of the combination is:<\/strong><\/p>\n<ul>\n<li>Zero<\/li>\n<li>f<\/li>\n<li>2 f<\/li>\n<li>f\/2<\/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>f\/2<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#17<\/span>. A convex length of focal length \u2018f<sub>1<\/sub>\u2019 and concave lens of focal length \u2018f<sub>2<\/sub>\u2019 are placed in contact. The focal length of the combination is:<\/strong><\/p>\n<ul>\n<li><strong>\u00a0<\/strong>f<sub>2<\/sub> + f<sub>1<\/sub><\/li>\n<li>f<sub>2<\/sub> &#8211; f<sub>1<\/sub><\/li>\n<li>f<sub>1<\/sub>f<sub>2 <\/sub>\u00a0\/ f<sub>2<\/sub> + f<sub>1<\/sub><\/li>\n<li>-f<sub>1<\/sub>f<sub>2<\/sub> \/ f<sub>1<\/sub> \u2013 f<sub>2<\/sub><\/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>-f<sub>1<\/sub>f<sub>2<\/sub> \/ f<sub>1<\/sub> \u2013 f<sub>2<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#18<\/span>. Final image produced by a compound microscope with respect to the object is?<\/strong><\/p>\n<ul>\n<li>Real and inverted<\/li>\n<li>Real and erect<\/li>\n<li>Virtual and erect<\/li>\n<li>Virtual and inverted<\/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>Virtual and inverted<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#19<\/span>. For normal adjustment, length of astronomical telescope is:<\/strong><\/p>\n<ul>\n<li>f<sub>o<\/sub> + f<sub>e<\/sub><\/li>\n<li>f<sub>o<\/sub> &#8211; f<sub>e<\/sub><\/li>\n<li>f<sub>o<\/sub> \/ f<sub>e<\/sub><\/li>\n<li>f<sub>e<\/sub> \/ f<sub>o<\/sub><\/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>f<sub>o<\/sub> + f<sub>e<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#20<\/span>. A surfboard moves at an aped of 5ms<sup>-1<\/sup>on the crests of the wave. The distance between wave crests is 10m. What is the frequency of the wave motion?<\/strong><\/p>\n<ul>\n<li>2 Hz<\/li>\n<li>5 Hz<\/li>\n<li>10 Hz<\/li>\n<li>0.5 Hz<\/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>0.5 Hz<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#21<\/span>. Dispersion effect may produce an error in light signals. This type of error is minimum in:<\/strong><\/p>\n<ul>\n<li>Single-mode step-index fiber<\/li>\n<li>Multimode step-index fiber<\/li>\n<li>Multimode graded-index fiber<\/li>\n<li>Monomode step-index fiber<\/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>Multimode graded-index fiber<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#22<\/span>. Light signals pass through multimode graded-index fiber due to?<\/strong><\/p>\n<ul>\n<li>Continuous refraction<\/li>\n<li>Total internal reflection<\/li>\n<li>Both continuous refraction and total internal reflection<\/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>Both continuous refraction and total internal reflection<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#23<\/span>. Which one type of fibre is more suitable for transmission of signals in which white light is used?<\/strong><\/p>\n<ul>\n<li>Mono mode step-index fibre<\/li>\n<li>Multimode step-index fibre<\/li>\n<li>Multi-mode graded-index fibre<\/li>\n<li>Single-mode step-index fibre<\/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>Multi mode graded-index fibre<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#24<\/span>. Critical angle is that incident angle in denser medium for which angle of refraction is.<\/strong><\/p>\n<ul>\n<li>0\u00b0<\/li>\n<li>45\u00b0<\/li>\n<li>90\u00b0<\/li>\n<li>180\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>90\u00b0<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#25<\/span>. There is a noticeable boundary between core and cladding for?<\/strong><\/p>\n<ul>\n<li>Multimode step-index fibre<\/li>\n<li>Multi-mode graded-index fibre<\/li>\n<li>Single-mode step-index fibre<\/li>\n<li>All types of fibre<\/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>Multi mode graded-index fibre<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#26<\/span>. The electrical signals change into light signals for transmission through optical fibre. A light pulse represents.<\/strong><\/p>\n<ul>\n<li>Zero (0)<\/li>\n<li>One (1)<\/li>\n<li>Both zero (0) and one (1)<\/li>\n<li>Either zero (0) or one (1)<\/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>One (1)<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#27<\/span>. A lens, which is thicker at the center and thinner at the edges, is called?<\/strong><\/p>\n<ul>\n<li>Concave lens<\/li>\n<li>Convex lens<\/li>\n<li>Plano-convex lens<\/li>\n<li>Plano concave lens<\/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>Convex lens<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#28<\/span>. A spectrometer is used to find?<\/strong><\/p>\n<ul>\n<li>Wavelength flight<\/li>\n<li>Refractive index of the prism<\/li>\n<li>The wavelength of different colors<\/li>\n<li>All of the above<\/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 of the above<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#29<\/span>. If a convex lens of focal length \u2018f\u2019 is cut into two identical halves along the lens diameter, the focal length of each half is?<\/strong><\/p>\n<ul>\n<li>f<\/li>\n<li>f\/2<\/li>\n<li>2f<strong><br \/>\n<\/strong><\/li>\n<li>3f\/2<\/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>2f<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#30<\/span>. A convex and concave lens of focal length \u2018f\u2019 are in contact. The focal length of the combination will be?<\/strong><\/p>\n<ul>\n<li>Zero<\/li>\n<li>f\/2<\/li>\n<li>2f<\/li>\n<li>Infinite<\/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>Infinite<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#31<\/span>. If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope?<\/strong><\/p>\n<ul>\n<li>Increases<\/li>\n<li>Decreases<\/li>\n<li>Remain the same<\/li>\n<li>Become half<\/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>Increases<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#32<\/span>. In optic fiber transmission system __________ are used to regenerate the dim light signal.<\/strong><\/p>\n<ul>\n<li>Diodes<\/li>\n<li>Repeaters<strong><br \/>\n<\/strong><\/li>\n<li>Laser<\/li>\n<li>Transformer<\/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>Repeaters<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#33<\/span>. Magnification of the astronomical telescope is?<\/strong><\/p>\n<ul>\n<li>f<sub>o<\/sub> + f<sub>e<\/sub><\/li>\n<li>f<sub>o<\/sub> \/ f<sub>e<\/sub><\/li>\n<li>f<sub>e<\/sub> \/ f<sub>o<\/sub><\/li>\n<li>(1 + f<sub>o<\/sub>\/f<sub>e<\/sub>) L\/f<sub>o<\/sub><\/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>f<sub>o<\/sub> \/ f<sub>e<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#34<\/span>. The equation \u03b1<sub>min<\/sub> = 1.22 \u03bb\/D was devised by?<\/strong><\/p>\n<ul>\n<li>Newton<\/li>\n<li>Einstein<\/li>\n<li>Raleigh<strong><br \/>\n<\/strong><\/li>\n<li>Planks<\/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>Raleigh<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#35<\/span>. The central image in a compound microscope is:<\/strong><\/p>\n<ul>\n<li>Virtual, erect, and magnified<\/li>\n<li>Real, inverted, and smaller than object<\/li>\n<li>Virtual, erected and magnified<\/li>\n<li>Erect, virtual and smaller than final image<\/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>Erect, virtual and smaller than final image<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#36<\/span>. Michelson calculated the speed of light using the instrument?<\/strong><\/p>\n<ul>\n<li>Spectrometer<\/li>\n<li>Galvanometer<\/li>\n<li>Interferometer<\/li>\n<li>None of these<\/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>Interferometer<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#37<\/span>. Michelson devised the formula to calculate speed of light?<\/strong><\/p>\n<ul>\n<li>c = 4fd<\/li>\n<li>c = 8fd<\/li>\n<li>c = 16fd<\/li>\n<li>c = 5\/2 fd<\/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>c = 16fd<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#38<\/span>. The function of collimator in spectrometer is?<\/strong><\/p>\n<ul>\n<li>To produce parallel beam of light<\/li>\n<li>To filter the light rays<\/li>\n<li>To make them mutually perpendicular<\/li>\n<li>No function<\/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>To produce parallel beam of light<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#39<\/span>. In optic fibre transmission, the repeaters are separated through a distance of _________ km in newer system.<\/strong><\/p>\n<ul>\n<li>300km<\/li>\n<li>200km<\/li>\n<li>100km<strong><br \/>\n<\/strong><\/li>\n<li>20km<\/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>100km<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#40<\/span>. Which color has the maximum angle of deviation in prism?<\/strong><\/p>\n<ul>\n<li>Red<\/li>\n<li>Blue<strong><br \/>\n<\/strong><\/li>\n<li>Orange<\/li>\n<li>Green<\/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>Blue<\/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 10 Optical Instruments Mcqs With Answers is about optical instruments based on principles of Reflection and Refraction. Every optical instrument has its own magnifying and resolving power. For the purpose of viewing small objects, a microscope is used. Different microscopes are used for different purposes. An Astronomical Telescope is used to &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\/134"}],"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=134"}],"version-history":[{"count":0,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/134\/revisions"}],"wp:attachment":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media?parent=134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/categories?post=134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/tags?post=134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}