{"id":61,"date":"2019-09-18T11:23:03","date_gmt":"2019-09-18T11:23:03","guid":{"rendered":"http:\/\/talib.pk\/test-preparation\/?p=61"},"modified":"2020-09-15T16:44:11","modified_gmt":"2020-09-15T11:44:11","slug":"1st-year-physics-chapter-4-work-and-energy-mcqs","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/1st-year-physics-chapter-4-work-and-energy-mcqs\/","title":{"rendered":"Physics 1st Year Chapter 4 Work and Energy 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>You can get the important Physics 1st Year Chapter 4 Work and Energy MCQs with Answers here. Work is defined as the product of Work and displacement. Work is done by two forces i.e. Constant and Variable Forces. Work is also done by the Gravitational field. Another important thing in this Chapter is power. Power is the measure of the rate at which work is done. The work-Energy principle and Escape Velocity also links with Work. Absolute Potential Energy has a relation with Energy.\u00a0 Conservation of Energy and Sources of Energy (Energy from tides, from waves, Solar Energy, from Biomass, from Waste products, and Geothermal Energy) are also described in the Chapter. So, get the important MCQs here and prepare for the Entry Test.<\/p>\n<h2 style=\"text-align: center;\">Physics 1st Year Chapter 4 Work and Energy MCQs<\/h2>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-392 aligncenter\" src=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Physics-1st-Year-MCQs-2.jpg\" alt=\"Physics 1st Year Chapter 4 Work and Energy MCQs with Answers\" width=\"300\" height=\"300\" srcset=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Physics-1st-Year-MCQs-2.jpg 300w, https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Physics-1st-Year-MCQs-2-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h3>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>Work done by Constant and Variable Forces<\/li>\n<li>Work is done by Gravitational Field<\/li>\n<li>Power\/Power and Velocity<\/li>\n<li>Work-Energy Principle<\/li>\n<li>Absolute Potential Energy<\/li>\n<li>Escape Velocity<\/li>\n<li>Interconversion of P.E and K.E<\/li>\n<li>Conservation of Energy<\/li>\n<li>Non-Conservational Energy Sources<\/li>\n<\/ul>\n<\/div>\n\t\t\t<\/div><\/div>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff6600;\">Question#1.<\/span> Work done will be maximum if the angle between the force F and displacement d is?<\/strong><\/p>\n<ul>\n<li>45\u00b0<\/li>\n<li>90\u00b0<\/li>\n<li>180\u00b0<\/li>\n<li>0\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#2<\/span>. A field in which the work is done in moving a body in a closed path is zero is called?<\/strong><\/p>\n<ul>\n<li>Electric field<\/li>\n<li>Conservative field<\/li>\n<li>Electromagnetic field<\/li>\n<li>Gravitational field<\/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>Conservative field<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#3<\/span>. When a force is perpendicular to the direction of motion of the body, then work done on the body is?<\/strong><\/p>\n<ul>\n<li>Zero<\/li>\n<li>Minimum<\/li>\n<li>Infinity<\/li>\n<li>Maximum<\/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>Zero<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#4<\/span>. Which of the following types of force does not work on the particle when it acts on it?<\/strong><\/p>\n<ul>\n<li>Frictional force<\/li>\n<li>Gravitational force<\/li>\n<li>Elastic force<\/li>\n<li>Centripetal force<\/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>Centripetal force<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#5<\/span>. If a body a mass of 2 kg is raised vertically through 2m, then the work done will be?<\/strong><\/p>\n<ul>\n<li>38.2 J<\/li>\n<li>392.1 J<\/li>\n<li>39.2 J<\/li>\n<li>3.92 J<\/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>39.2 J<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#6<\/span>. An elevator weighing 3.5&#215;10<sup>+10<\/sup> N is raised to a height of 1000m in the absence of friction, the work done is?<\/strong><\/p>\n<ul>\n<li>3.5&#215;10<sup>3<\/sup> J<\/li>\n<li>3.5&#215;10<sup>4<\/sup> J<\/li>\n<li>3.5&#215;10<sup>6<\/sup> J<\/li>\n<li>3.5&#215;10<sup>9<\/sup> J<\/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>3.5&#215;10<sup>9<\/sup> J<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#7<\/span>. The average power and instantaneous power become equal if work is done?<\/strong><\/p>\n<ul>\n<li>Any rate<\/li>\n<li>Variable-rate<\/li>\n<li>Uniform rate<\/li>\n<li>High rate<\/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>Uniform rate<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#8<\/span>. The relation between horsepower and watt is?<\/strong><\/p>\n<ul>\n<li>1 hp = 546 watts<\/li>\n<li>1 hp = 746 watts<\/li>\n<li>1 hp = 1000 watts<\/li>\n<li>1 hp = 946 watts<\/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 hp = 746 watts<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#9<\/span>. Proton, electron and neutron and \u03b1 particles have same momentum. Which of them have highest K.E?<\/strong><\/p>\n<ul>\n<li>Proton<\/li>\n<li>Electron<\/li>\n<li>Neutron<\/li>\n<li>\u03b1-particle<\/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>Electron<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#10<\/span>. The power output of a lamp is 6W. How much energy does the lamp give out in 2 minutes?<\/strong><\/p>\n<ul>\n<li>3 J<\/li>\n<li>120 J<\/li>\n<li>720 J<\/li>\n<li>430 J<\/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>720 J<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#11<\/span>. Work done by a variable force is determined by dividing?<\/strong><\/p>\n<ul>\n<li>Force into the small interval<\/li>\n<li>Displacement into the small interval<\/li>\n<li>Both force and displacement into small intervals<\/li>\n<li>Force into small and displacement into large intervals<\/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>Displacement into small interval<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#12<\/span>. Work done on the body equals?<\/strong><\/p>\n<ul>\n<li>Change in its K.E always<\/li>\n<li>Change in its P.E always<\/li>\n<li>Change in its K.E or change in its P.E<\/li>\n<li>Neither change in K.E nor change in its P.E<\/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>Change in its K.E or change in its P.E<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#13<\/span>. The escape velocity of a body in the gravitational field of Earth is independent of?<\/strong><\/p>\n<ul>\n<li>it&#8217;s mass<\/li>\n<li>the angle at which it is thrown<\/li>\n<li>both its mass and the angle at which it is thrown<\/li>\n<li>the gravitational field of Earth<\/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 its mass and the angle at which it is thrown<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#14<\/span>. The tides raise the water in the sea roughly in a day?<\/strong><\/p>\n<ul>\n<li>Once<\/li>\n<li>Twice<strong><br \/>\n<\/strong><\/li>\n<li>Four-time<\/li>\n<li>Eight-time<\/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>Twice<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#15<\/span>. The source of geothermal energy is: <\/strong><\/p>\n<ul>\n<li>The decay of radioactive elements in the earth<\/li>\n<li>Compression of material in the earth<\/li>\n<li>The residual heat of the earth<\/li>\n<li>All as side in a, b and c<\/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 as side in a, b and c<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#16<\/span>. The highest value of escape velocity in the solar system is for the planet?<\/strong><\/p>\n<ul>\n<li>Earth<\/li>\n<li>Neptune<\/li>\n<li>Jupiter<\/li>\n<li>Moon<\/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>Jupiter<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#17<\/span>. Work done by the force of friction is?<\/strong><\/p>\n<ul>\n<li>Always positive<\/li>\n<li>Always negative<\/li>\n<li>Positive only for the small frictional force<\/li>\n<li>Positive only for the large frictional force<\/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>Always negative<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#18<\/span>. Gravitational P.E of a body can be found by?<\/strong><\/p>\n<ul>\n<li>no formula<\/li>\n<li>mg.h<\/li>\n<li>&#8211; Gm\/r<\/li>\n<li>Both b and c<\/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>mg.h<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#19<\/span>. If velocity is doubled, then?<\/strong><\/p>\n<ul>\n<li>Momentum increase to 4 times and K.E increases to 2 times<\/li>\n<li>Momentum and K.E remain the same<\/li>\n<li>Momentum increases to 2 times and K.E increases constant<\/li>\n<li>Momentum increases to 2 times and K.E increases to 4 times<\/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>Momentum increases to 2 times and K.E increases to 4 times<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#20<\/span>. We get energy from food during a day which is equivalent to the energy obtained from _______ liter petrol?<\/strong><\/p>\n<ul>\n<li>1<\/li>\n<li>\u00bd<\/li>\n<li>1\/3<\/li>\n<li>\u00bc<\/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<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#21<\/span>. One megawatt-hour is equal to?<\/strong><\/p>\n<ul>\n<li>3.6&#215;10<sup>6 <\/sup>\u00a0J<\/li>\n<li>3.6&#215;10<sup>12<\/sup> J<\/li>\n<li>3.6&#215;10<sup>9<\/sup> J<\/li>\n<li>3.6&#215;10<sup>8<\/sup> J<\/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>3.6&#215;10<sup>8<\/sup> J<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#22<\/span>. Which of the following is not a conservative force?<\/strong><\/p>\n<ul>\n<li>Friction<\/li>\n<li>Electric<\/li>\n<li>Gravitational<\/li>\n<li>Elastic spring force<\/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>Friction<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#23<\/span>. Does work have the dimension as that of the same as that of?<\/strong><\/p>\n<ul>\n<li>Torque<strong><br \/>\n<\/strong><\/li>\n<li>Angular momentum<\/li>\n<li>Linear momentum<\/li>\n<li>Power<\/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>Torque<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#24<\/span>. The pull of the Moon can distort the continents by pulling and up and down by as much as?<\/strong><\/p>\n<ul>\n<li>25mm<\/li>\n<li>25cm<strong><br \/>\n<\/strong><\/li>\n<li>250cm<\/li>\n<li>2.5cm<\/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>25cm<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#25<\/span>. The relation between the escape velocity V<sub>esc<\/sub> and orbital speed V<sub>o<\/sub> is given by?<\/strong><\/p>\n<ul>\n<li>V<sub>esc<\/sub> = 1\/2V<sub>o<\/sub><\/li>\n<li>V<sub>esc<\/sub> = \u221a2 V<sub>o<\/sub><\/li>\n<li>V<sub>esc<\/sub> = V<sub>o<\/sub><\/li>\n<li>V<sub>esc<\/sub> = 2V<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>V<sub>esc<\/sub> = \u221a2 V<sub>o<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#26<\/span>. The escape velocity from the earth&#8217;s surface in km s<sup>-1<\/sup> is about?<\/strong><\/p>\n<ul>\n<li>4.2 km s<sup>-1<\/sup><\/li>\n<li>7.5 km s<sup>-1<\/sup><\/li>\n<li>9.5 km s<sup>-1<\/sup><\/li>\n<li>11 km s<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>11 km s<sup>-1<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#27<\/span>. If the Moon radius is 1600 km and g on its surface is 1.6 ms<sup>-2<\/sup>, then the escape velocity on the moon is?<\/strong><\/p>\n<ul>\n<li>1600ms<sup>-1<\/sup><\/li>\n<li>50.6ms<sup>-1<\/sup><\/li>\n<li>71.6ms<sup>-1<\/sup><\/li>\n<li>2400ms<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>2400ms<sup>-1<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#28<\/span>. When two protons are brought close, their?<\/strong><\/p>\n<ul>\n<li>Kinetic energy increases<\/li>\n<li>P.E. increases<\/li>\n<li>P.E. decreases<\/li>\n<li>P.E. does not change<\/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>P.E. increases<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#29<\/span>. When an arrow is released from its bow, its energy is transformed from?<\/strong><\/p>\n<ul>\n<li>The heat energy to K.E<\/li>\n<li>Elastic P.E to K.E<\/li>\n<li>Chemical energy to elastic P.E<\/li>\n<li>K.E to elastic P.E<\/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>Elastic P.E to K.E<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#30<\/span>. Two bodies of 4g and 16g have the same K.E. What is the ratio of their momentum?<\/strong><\/p>\n<ul>\n<li>2:1<\/li>\n<li>4:1<\/li>\n<li>1:<span style=\"font-weight: 700 !important;\">2<\/span><\/li>\n<li>1:4<\/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>1:2<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#31<\/span>. Escape velocity depends upon the radius of Earth. Which one shows its proper dependence?<\/strong><\/p>\n<ul>\n<li>V \u03b1 R<\/li>\n<li>V \u03b1 R<sup>1\/2<\/sup><\/li>\n<li>V \u03b1 R<sup>1\/3<\/sup><\/li>\n<li>V \u03b1 R<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>V \u03b1 R<sup>1\/2<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#32<\/span>. The temperature of hot igneous rocks is about?<\/strong><\/p>\n<ul>\n<li>20,000 \u00b0C or more<\/li>\n<li>2000\u00b0C or more<\/li>\n<li>200\u00b0 C or more<\/li>\n<li>20\u00b0C or more<\/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>200\u00b0 C or more<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#33<\/span>. A tennis ball is dropped on to a horizontal surface. As the ball bounces up and down, the height of each bounce gradually decreases, during the motion of the ball?<\/strong><\/p>\n<ul>\n<li>The K.E of the ball is constant<\/li>\n<li>The sum of P.E and K.E energies of the ball is constant<\/li>\n<li>The P.E of the ball is constant<\/li>\n<li>The total energy of the ball, ground, and the air is constant<\/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>The total energy of the ball, ground and air is constant<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#34<\/span>. The propulsion force of a rocket is?<\/strong><\/p>\n<ul>\n<li>Non-conservative force<\/li>\n<li>Conservative force<\/li>\n<li>Conservative and rocket has reached high altitude<\/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>Non-conservative force<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#35<\/span>. A car is driven along a level road. The total energy input from petrol is 60kJ and the car wastes 45kJ of energy, what is the efficiency of the car?<\/strong><\/p>\n<ul>\n<li>25%<\/li>\n<li>15%<\/li>\n<li>45%<\/li>\n<li>75%<\/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>25%<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#36<\/span>. Geothermal energy is a __________source of energy.<\/strong><\/p>\n<ul>\n<li>Non-renewable<\/li>\n<li>Stable<\/li>\n<li>Renewable<\/li>\n<li>None 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>Renewable<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#37<\/span>. The source of tidal energy is?<\/strong><\/p>\n<ul>\n<li>Sun<\/li>\n<li>Earth<\/li>\n<li>Both a and b<\/li>\n<li>Moon<\/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>Moon<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#38<\/span>. ________ cell converts solar energy into electrical energy.<\/strong><\/p>\n<ul>\n<li>Rotary<\/li>\n<li>Photovoltaic<\/li>\n<li>Galvanic<\/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>Photovoltaic<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#39<\/span>. From which source would the release of energy be affected by the change in the earth\u2019s gravitational field?<\/strong><\/p>\n<ul>\n<li>Geothermal<\/li>\n<li>Chemical<\/li>\n<li>Hydroelectric<strong><br \/>\n<\/strong><\/li>\n<li>Nuclear<\/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>Hydroelectric<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#40<\/span>. The center of the Sun produces large amounts of energy, what is the source of this energy?<\/strong><\/p>\n<ul>\n<li>Chemical reaction<\/li>\n<li>Nuclear fission<\/li>\n<li>Nuclear fusion<\/li>\n<li>Radioactive decay<\/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>Nuclear fusion<\/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>You can get the important Physics 1st Year Chapter 4 Work and Energy MCQs with Answers here. Work is defined as the product of Work and displacement. Work is done by two forces i.e. Constant and Variable Forces. Work is also done by the Gravitational field. Another important thing in this Chapter is power. Power &hellip;<\/p>\n","protected":false},"author":2,"featured_media":392,"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\/61"}],"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=61"}],"version-history":[{"count":0,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/61\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media\/392"}],"wp:attachment":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media?parent=61"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/categories?post=61"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/tags?post=61"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}