{"id":4948,"date":"2024-05-17T07:27:38","date_gmt":"2024-05-17T06:27:38","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=4948"},"modified":"2024-05-17T07:30:17","modified_gmt":"2024-05-17T06:30:17","slug":"work-power-and-energy-set-1","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2024\/05\/17\/work-power-and-energy-set-1\/","title":{"rendered":"Work, Power and Energy Set &#8211; 1"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>1. Number of ergs contained in one joule is ________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. 10<sup>3<\/sup><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. 10<sup>5<\/sup><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. 10<sup>7<\/sup><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. 10<sup>9<\/sup><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:C<BR>\nSOLUTION :Therefore, 1 Joule = 10 7 erg .<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Kinetic and potential energies of a body are the components of it&#8217;s __________ energy .<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Chemical<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Electrical<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Mechanical<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Heat<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:C<BR>\nSOLUTION:The kinetic and potential energies of a body are the components of its mechanical energy.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Number of joule contained in 1 KW- hr is ________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. 9.8<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. 3.6 X 10<sup>6<\/sup><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. 1000<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. 105<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:B<BR>\nSOLUTION:One kilowatt-hour (kWh) is equal to 3.6 million joules (3.6 \u00d7 10^6 joules). This is because one kilowatt (kW) is equal to 1,000 watts, one watt is equal to one joule per second, and one hour is equal to 3,600 seconds. <\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4.  The time rate at which work is done or energy is transferred is called _____.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A.  Power<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. <strong>Kinetic energy<\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Work<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. None of these<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:A<BR>\nSOLUTION: The time rate at which work is done or energy is transferred is called power. The SI unit for power is the watt (W), where 1 watt equals 1 joule\/second (1 W=1 J\/s). \n<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. A block of mass 50 kg just slides over a horizontal distance of 1m. If Coefficient of friction between their surface is 0.2,the work done against friction is <\/strong>_________.<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. 98 J<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. 72 J<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. 56 J<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. <strong><strong>34 J<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:A<BR>\nSOLUTION:A block of mass 50kg slides over a horizontal distance of 1m. If the coefficient of friction between their surfaces is 0.2,then work done against friction is: 98J.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. Work is said to be positive on the body when the angle between force and displacement is ___________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. 0<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Less than <strong>90<sup>0<\/sup><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Greater than <strong>180<sup>0<\/sup><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. <strong><strong><strong>None of these<\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:B<BR>\nSOLUTION :if angle between force apparent object is less than 90 degree then the work is positive&#8230; it is greater than 90 it is negative and if it is 90 and work done is zero.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. A position dependent force F = 7-2X + 3x<sup>2<\/sup> N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is <\/strong>____.<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. <strong>35<\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. <strong><strong>135<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. <strong><strong>70<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. \u00a0<strong><strong><strong><strong><strong>270<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:B<BR>\nSOLUTION:Hence, the work done is 135 J.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. It is easier to draw up a wooden block along an inclined plane than to haul it vertically principally because ________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. \u2018 g\u2019 become smaller<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. <strong><strong><strong>The friction is reduced<\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. <strong><strong><strong><strong><strong>Only a part of the weight has to be over come<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. <strong><strong><strong><strong><strong><strong><strong><strong><strong>The mass become smaller<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:C<BR>\nSOLUTION: The vertical plane \nW\n=\nm\ng\nh\n\nfor inclined plane \nW\n\u2032\n=\nm\ng\nh\ns\ni\nn\n(\nQ\n)\n\ns\ni\nn\nQ\n<\n1\n\nW\n>\nW\n\u2032\n\nhence only one part of weight is to overcome<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>9. A spring of force constant 800 N\/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is :<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. 24 J<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. <strong><strong>16 J<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. <strong><strong>8 J<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. <strong><strong><strong>32J<\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:C<BR>\nSOLUTION: 8J<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>10.  When two equal masses undergo a glancing elastic collision with one of them at rest, after the collision, they will move at ________ to each other.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Straight line<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. <strong>Right angles<\/strong><\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Opposite<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. None of these<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER:B<BR>\nSOLUTION: When two spheres of equal masses undergo a glancing elastic collision with one of them at rest, after the collision they will move at right angle to each other.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. Number of ergs contained in one joule is ________. A. 103 B. 105 C. 107 D. 109 ANSWER &#038; SOLUTION ANSWER:C SOLUTION :Therefore, 1 Joule = 10 7 erg . 2. Kinetic and potential energies of a body are the components of it&#8217;s __________ energy . A. Chemical B. Electrical C. Mechanical D. Heat<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[2837,2839,2842,2840,2836,2832,2834,2835,2845,2838],"class_list":{"0":"post-4948","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-physics","7":"tag-a-block-of-mass-50-kg-just-slides-over-a-horizontal-distance-of-1m-if-coefficient-of-friction-between-their-surface-is-0-2-the-work-done-against-friction-is-_________","8":"tag-a-position-dependent-force-f-7-2x-3x2-n-acts-on-a-small-body-of-mass-2kg-and-displaces-it-from-x-0-to-x-5m-the-work-done-in-joules-is-____","9":"tag-a-spring-of-force-constant-800-n-m-has-an-extension-of-5-cm-the-work-done-in-extending-it-from-5-cm-to-15-cm-is","10":"tag-it-is-easier-to-draw-up-a-wooden-block-along-an-inclined-plane-than-to-haul-it-vertically-principally-because-________","11":"tag-kinetic-and-potential-energies-of-a-body-are-the-components-of-its-__________-energy","12":"tag-number-of-ergs-contained-in-one-joule-is-________","13":"tag-number-of-joule-contained-in-1-kw-hr-is-________","14":"tag-the-time-rate-at-which-work-is-done-or-energy-is-transferred-is-called-_____","15":"tag-when-two-equal-masses-undergo-a-glancing-elastic-collision-with-one-of-them-at-rest-after-the-collision-they-will-move-at-________-to-each-other","16":"tag-work-is-said-to-be-positive-on-the-body-when-the-angle-between-force-and-displacement-is-___________"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/4948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=4948"}],"version-history":[{"count":2,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/4948\/revisions"}],"predecessor-version":[{"id":4980,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/4948\/revisions\/4980"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=4948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=4948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=4948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}