{"id":28436,"date":"2022-01-31T11:31:44","date_gmt":"2022-01-31T06:01:44","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=28436"},"modified":"2023-12-21T16:35:27","modified_gmt":"2023-12-21T11:05:27","slug":"motion-and-time-class-7-extra-questions-science-chapter-13","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/","title":{"rendered":"Motion and Time Class 7 Extra Questions Science Chapter 13"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/#Motion_and_Time_Class_7_Extra_Questions_Science_Chapter_13\" title=\"Motion and Time Class 7 Extra Questions Science Chapter 13\">Motion and Time Class 7 Extra Questions Science Chapter 13<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/#Motion_and_Time_Class_7_Science_Extra_Questions_Very_Short_Answer_Type_Questions\" title=\"Motion and Time Class 7 Science Extra Questions Very Short Answer Type Questions\">Motion and Time Class 7 Science Extra Questions Very Short Answer Type Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/#Motion_and_Time_Class_7_Science_Extra_Questions_Short_Answer_Type_Questions\" title=\"Motion and Time Class 7 Science Extra Questions Short Answer Type Questions\">Motion and Time Class 7 Science Extra Questions Short Answer Type Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/#Motion_and_Time_Class_7_Science_Extra_Questions_Long_Answer_Type_Questions\" title=\"Motion and Time Class 7 Science Extra Questions Long Answer Type Questions\">Motion and Time Class 7 Science Extra Questions Long Answer Type Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/cbse-notes\/class-7\/maths\/motion-and-time-class-7-extra-questions-science-chapter-13\/#Motion_and_Time_Class_7_Science_Extra_Questions_Miscellaneous_Questions\" title=\"Motion and Time Class 7 Science Extra Questions Miscellaneous Questions\">Motion and Time Class 7 Science Extra Questions Miscellaneous Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Motion_and_Time_Class_7_Extra_Questions_Science_Chapter_13\"><\/span>Motion and Time Class 7 Extra Questions Science Chapter 13<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Motion_and_Time_Class_7_Science_Extra_Questions_Very_Short_Answer_Type_Questions\"><\/span>Motion and Time Class 7 Science Extra Questions Very Short Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nGive the basic unit of speed.<br \/>\nAnswer:<br \/>\nMetre\/second is the basic unit of speed.<\/p>\n<p>Question 2.<br \/>\nMention which is the most common thing in almost all the clocks.<br \/>\nAnswer:<br \/>\nThe most common thing in almost all the clocks is that all of them shows periodic motion.<\/p>\n<p>Question 3.<br \/>\nPaheli and Boojho have to cover different distances to reach their school but they take the same time to reach the school. What can you say about their speed? [NCERT Exemplar; HOTS]\nAnswer:<br \/>\nThey do not have equal speed because they cover unequal distance in equal intervals of time. One of them has higher speed whom has to cover larger distance with respect to other.<\/p>\n<p>Question 4.<br \/>\nIf Boojho covers a certain distance in one hour and Paheli covers the same distance in two hours, who travels with a higher speed? [NCERT Exemplar; HOTS]\nAnswer:<br \/>\nBoojho travels with a higher speed as he has covered same distance in lesser time with respect to Paheli.<\/p>\n<p>Question 5.<br \/>\nA simple pendulum is oscillating between two points A and B as shown in figure. Is the motion of the bob uniform or non-uniform?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75665\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-1.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 1\" width=\"133\" height=\"144\" \/><br \/>\nAnswer:<br \/>\nThe motion of bob is non-uniform as it does not cover equal distance in equal intervals of time.<\/p>\n<p>Question 6.<br \/>\nState the characteristic of distance-time graph for the motion of an object moving with a constant speed.<br \/>\nAnswer:<br \/>\nThe distance-time graph for the motion of an object moving with a constant speed is a straight line inclined on x-axis at some angles.<\/p>\n<p>Question 7.<br \/>\nName the axis that represents dependent variable.<br \/>\nAnswer:<br \/>\ny-axis represents the dependent variable.<\/p>\n<p>Question 8.<br \/>\nBriefly explain how will decide which object is moving fast and which one is moving slow.<br \/>\nAnswer:<br \/>\nIf an object covers more distance in equal intervals of time with respect to other, then we can say that object is moving faster with respect to the other object.<\/p>\n<p>Question 9.<br \/>\nIf you did not have a clock, how would you decide what time of the day is? [HOTS]\nAnswer:<br \/>\nWe can decide time of the day without clock by seeing shadow formed by the sun, e.g. at noon, shadow formed by the sun is shorter than at evening.<\/p>\n<p>Question 10.<br \/>\nState how do we measure time interval of a month.<br \/>\nAnswer:<br \/>\nTime interval of a month is measured by one new moon to the next.<\/p>\n<p>Question 11.<br \/>\nDetermine the number of seconds there in a day.<br \/>\nAnswer:<br \/>\nIn a day, we have 24 h<br \/>\nWe know that 1 h = 3600 s<br \/>\nSo, 24 h = 3600 \u00d7 24 = 86400s<\/p>\n<p>Question 12.<br \/>\nEstimate that how many hours are there in a year.<br \/>\nAnswer:<br \/>\nIn a year, we have 365 days and 1 day = 24 h<br \/>\nSo, for 365 days, we have 24 \u00d7 365 h = 8760 h<\/p>\n<p>Question 13.<br \/>\nExplain how time was measured when pendulum clocks were not available.<br \/>\nAnswer:<br \/>\nBefore the discovery of pendulum clocks, sundials, water clocks and sand clocks were used.<\/p>\n<p>Question 14.<br \/>\nA spaceship travels 36000 km in one hour.Express its speed in km\/s.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75666\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-2.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 2\" width=\"312\" height=\"110\" \/><\/p>\n<p>Question 15.<br \/>\nOut of the two given clocks, a pendulum clock or a quartz clock. Mention which of the clock between the given ones requires an electric cell for its working?<br \/>\nAnswer:<br \/>\nA quartz clock requires an electric cell for its working.<\/p>\n<p>Question 16.<br \/>\nName the most ancient unit of time in which it was earlier measured.<br \/>\nAnswer:<br \/>\nSolar day is the most ancient unit of time in which it was earlier measured.<\/p>\n<p>Question 17.<br \/>\nState the condition under which the distance-time graph of an object is a horizontal line parallel to the axis of time.<br \/>\nAnswer:<br \/>\nWhen the object is at rest, then the distance-time graph of an object is a horizontal line parallel to the axis of time.<\/p>\n<p>Question 18.<br \/>\nState the factors on which the time period of a simple pendulum depend.<br \/>\nAnswer:<br \/>\nThe factors on which the time period of a simple pendulum depend are<\/p>\n<ul>\n<li>Length of the pendulum<\/li>\n<li>Acceleration due to gravity.<\/li>\n<\/ul>\n<p>Question 19.<br \/>\nName the different types of graphs.<br \/>\nAnswer:<br \/>\nDifferent types of graphs are<\/p>\n<ul>\n<li>Line graph<\/li>\n<li>Pie chart<\/li>\n<li>Bar graph<\/li>\n<\/ul>\n<p>Question 20.<br \/>\nState the way through which we can prepare a pendulum by our own.<br \/>\nAnswer:<br \/>\nBy suspending a metal ball with the help of a cotton thread and the other end of the thread can be tied to some different supports, so in this way, we can prepare a pendulum by our own.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Motion_and_Time_Class_7_Science_Extra_Questions_Short_Answer_Type_Questions\"><\/span>Motion and Time Class 7 Science Extra Questions Short Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nLast Sunday, Priyanka decided to go outside with her family for the dinner in some particular restaurant.<br \/>\nThen, she thought to go through her own car. So, while moving she increased the speed of the car from 36 km\/h to 54 km\/h. All of sudden, a rickshaw came in front of her car but due to applying of brakes at the right time, both of them got safe from meeting with an accident. [Value Based Question]\n(a) Calculate the increase in the speed of the car in the terms of m\/s.<br \/>\n(b) Mention a positive action performed by Priyanka here.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75667\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-3.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 3\" width=\"313\" height=\"77\" \/><br \/>\n\u2234 Increase in speed = Final speed \u2013 Initial speed =(15-10) m\/s = 5 m\/s<br \/>\n(b) Priyanka applied the brakes at a right time while driving the car and prevented her family and the person on rickshaw from meeting with an accident.<\/p>\n<p>Question 2.<br \/>\nDifferentiate between a uniform and non-uniform motion.<br \/>\nAnswer:<br \/>\nWhen a body travels equal distance in an equal interval of time, then the body is said to be in a uniform motion.<br \/>\nWhen a body travels unequal distance in an equal interval of time, then the body is said to be in non-uniform motion.<\/p>\n<p>Question 3.<br \/>\nBriefly mention how many types of motion are there. Also, name all of them.<br \/>\nAnswer:<br \/>\nDifferent types of motion are there and they can be named as follows<\/p>\n<ul>\n<li>Periodic motion<\/li>\n<li>Rolling motion<\/li>\n<li>Rotatory motion<\/li>\n<li>Oscillatory and vibratory motions<\/li>\n<li>Translatory motion<\/li>\n<\/ul>\n<p>Question 4.<br \/>\nThe average age of children of class VII is 12 years and 3 months. Express this age in second. [NCERT Exemplar]\nAnswer:<br \/>\nGiven, the average age of children 12 years and 3 months<br \/>\n1 year = 365 days = 365 \u00d7 24 h [1 day = 24 h]\n= 365 \u00d7 24 \u00d7 3600 s [1 h = 3600 s]\n12 years = 31536000 s \u00d7 12 = 378432000 s<br \/>\n3 months = 30x3days = 30 \u00d7 3 \u00d7 24h = 30 \u00d7 3 \u00d7 24 \u00d7 3600s = 7776000s<br \/>\nSo, total age in second = 378432000 + 7776000 = 386208000s<\/p>\n<p>Question 5.<br \/>\nPlot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on X-axis and \/-axis, respectively. The circumference of the circle traced by the second hand is 64 cm. [NCERT Exemplar]\nAnswer:<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"92\"><strong>Time (s)<\/strong><\/td>\n<td width=\"33\">X<\/td>\n<td width=\"39\">15<\/td>\n<td width=\"39\">30<\/td>\n<td width=\"39\">45<\/td>\n<td width=\"41\">60<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"92\"><strong>Distance (cm)<\/strong><\/td>\n<td width=\"33\">Y<\/td>\n<td width=\"39\">16<\/td>\n<td width=\"39\">32<\/td>\n<td width=\"39\">48<\/td>\n<td width=\"41\">64<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>As, here equal distance is covered in equal intervals of time.<br \/>\nSo, graph will be straight line.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75668\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-4.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 4\" width=\"164\" height=\"135\" \/><\/p>\n<p>Question 6.<br \/>\nWith the help of the data given in the following table, show graphically the relationship between the diameter and circumference of a circle.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"142\"><strong>Diameter of the circle <\/strong><strong>(cm)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"142\"><strong>Circumference of the circle (cm)<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">1<\/td>\n<td style=\"text-align: center\" width=\"142\">3.2<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">2<\/td>\n<td style=\"text-align: center\" width=\"142\">6.3<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">3<\/td>\n<td style=\"text-align: center\" width=\"142\">9.4<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">4<\/td>\n<td style=\"text-align: center\" width=\"142\">12.6<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">5<\/td>\n<td style=\"text-align: center\" width=\"142\">15.7<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"142\">6<\/td>\n<td style=\"text-align: center\" width=\"142\">18.8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Answer:<br \/>\nWith the help of a given data in a tabular form, the graph can be obtained by taking diameter of the circle on the x-axis and the circumference on y-axis. On x-axis, 1 cm diameter is shown by 1 cm and on the y-axis, 3 cm of circumference is shown by 1 cm.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75669\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-5.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 5\" width=\"338\" height=\"307\" \/><\/p>\n<p>Question 7.<br \/>\nStarting from A, Paheli moves along a rectangular path ABCD as shown in figure. She takes 2 min to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75670\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-6.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 6\" width=\"177\" height=\"98\" \/><br \/>\nAnswer:<br \/>\nSince, the distance covered per unit time for the entire distance covered is not the same, the motion is a non-uniform motion.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75671\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-7.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 7\" width=\"216\" height=\"294\" \/><\/p>\n<p>Question 8.<br \/>\nOne day, a five years old boy, Chintoo was playing with his toys in his room. After few minutes, he saw a wristwatch on his study table, so after seeing it, he got crazy and so much in eager to play with that watch. Then, for 2 to 3 min, he was trying to analyse it that whether its a toy or something else, then suddenly, he was just about to throw it but at the same his mother entered into the room and take the watch back immediately from his hand.<br \/>\n(a) State the benefit of a wristwatch.<br \/>\n(b) Briefly mention the values showed by Chintoo\u2019s mother here. [Value Based Question]\nAnswer:<br \/>\n(a) The wristwatch can be handled very easily to check the time in comparison to the wall clock.<br \/>\n(b) The values showed by Chintoo\u2019s mother here is the concern towards her four years old child and also the concern towards that wristwatch while considering the importance of money.<\/p>\n<p>Question 9.<br \/>\nThe following distance-time graph of three objects (D, E and F) are given (see figure given alongside). What can you say about the motion of the objects?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75672\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-8.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 8\" width=\"173\" height=\"142\" \/><br \/>\nAnswer:<br \/>\nSince, the distance-time graph of an object D is a straight line therefore, its motion is uniform. Also here, we can see that the distance-time graph of object E is parallel to x-axis (time-axis), therefore object E is at rest.<br \/>\nAs, the distance-time graph of object F is a curved line, therefore the object C is moving with a non-uniform speed and its motion is non-uniform.<\/p>\n<p>Question 10.<br \/>\nThe following figure shows the distance-time graph for the motion of two objects D and E. Which one of them is moving slower?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75673\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-9.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 9\" width=\"149\" height=\"137\" \/><br \/>\nAnswer:<br \/>\nAfter studying the figure given alongside, D or E is moving slower as the slope of distance-time graph of E is less than that of graph D.<\/p>\n<p>Question 11.<br \/>\nThe following figure shows the distance-time graph for the motion of two vehicles (C and D). At what time and distance (from the starting point), they will cross each other.<br \/>\nAnswer:<br \/>\nFirstly, draw perpendicular lines from point E on x-axis and y-axis.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75674\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-10.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 10\" width=\"319\" height=\"258\" \/><br \/>\nThe two vehicles (C and D) will meet (or cross) each other at 5:00 PM and after travelling a distance of 4 km.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Motion_and_Time_Class_7_Science_Extra_Questions_Long_Answer_Type_Questions\"><\/span>Motion and Time Class 7 Science Extra Questions Long Answer Type Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nGiven below as a figure is the distance-time graph of the motion of<br \/>\n(a) What will be the position of the object at 20 s?<br \/>\n(b) What will be the distance travelled by the object in 12 s?<br \/>\n(c) What is the average speed ofthe object? [NCERT Exemplar]\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75675\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-11.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 11\" width=\"273\" height=\"197\" \/><br \/>\nAnswer:<br \/>\n(a) From the graph, it is clear that the distance at 20 s is 8 m.<br \/>\n(b) Distance travelled by the body object in 12 s is 6 m.<br \/>\n(c) As, average speed = \\(\\frac{\\text { Total distance }}{\\text { Total time }}=\\frac{8}{20}=0.4 \\mathrm{m} \/ \\mathrm{s}\\)<\/p>\n<p>Question 2.<br \/>\nBoojho goes to the football ground to play football. The distance-time graph of his journey from his home to the ground is given as figure. [NCERT Exemplar]\n(a) What does the graph between points B and C indicate about the motion of Boojho?<br \/>\n(b) Is the motion between 0 to 4 min uniform or non-uniform?<br \/>\n(c) What is his speed between 8 to 12 min of his journey?<br \/>\nAnswer:<br \/>\n(a) Since, the graph between B and C is parallel to time-axis, so it indicates that Boojho is at rest.<br \/>\n(b) Since, the graph is not straight line, so it is a non-uniform motion.<br \/>\n(c) As, speed = \\(\\frac{\\text { Distance }}{\\text { Time }}=\\frac{225-150}{12-8}=\\frac{75}{4}=18.75 \\mathrm{m} \/ \\mathrm{min}\\)<\/p>\n<p>Question 3.<br \/>\nExplain by giving example that how can we choose a suitable scale.<br \/>\nAnswer:<br \/>\nWhile choosing the most suitable scale for drawing a graph, we should keep the following points in mind<br \/>\n(i) The difference between the highest and lowest values of each quantity.<br \/>\n(ii) The intermediate values of each quantity so that with the scale chosen, it is easy to mark the values on the graph.<br \/>\n(iii) To utilise the maximum part of the paper on which the graph is to be drawn, assume that we have a graph paper of size 25 cm x 25 cm and we have to accommodate following data:<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"74\"><strong>Time (AM)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"69\"><strong>Odometer <\/strong><strong>reading<\/strong><\/td>\n<td style=\"text-align: center\" width=\"110\"><strong>Distance from the starting point<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"74\">8:00 AM<\/td>\n<td width=\"69\">36540 km<\/td>\n<td width=\"110\">0 km<\/td>\n<\/tr>\n<tr>\n<td width=\"74\">8:30 AM<\/td>\n<td width=\"69\">36560 km<\/td>\n<td width=\"110\">20 km<\/td>\n<\/tr>\n<tr>\n<td width=\"74\">9:00 AM<\/td>\n<td width=\"69\">36580 km<\/td>\n<td width=\"110\">40 km<\/td>\n<\/tr>\n<tr>\n<td width=\"74\">9:30 AM<\/td>\n<td width=\"69\">36600 km<\/td>\n<td width=\"110\">60 km<\/td>\n<\/tr>\n<tr>\n<td width=\"74\">10:00 AM<\/td>\n<td width=\"69\">36620 km<\/td>\n<td width=\"110\">80 km<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Since, one of the scales will be<br \/>\nDistance 5 km = 1 cm and Time 6 min = 1 cm<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75676\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-12.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 12\" width=\"348\" height=\"205\" \/><\/p>\n<p>Question 4.<br \/>\nDistance between Bholu\u2019s and Golu\u2019s house is 9 km. Bholu has to attend Golu\u2019s birthday party at 7 O\u2019 clock. He started his journey from his home at 6 O\u2019 clock on his bicycle and covered a distance of 6 km in 40 min. At that point, he met Chintu and he spoke to him for 5 min and reached Golu\u2019s birthday party at 7 O\u2019 clock. With what speed, did he cover the second part of the journey? Calculate-his average speed for the entire journey. [NCERT Exemplar]\nAnswer:<br \/>\nFrom the question, Bholu covers 3 km distance in 15 min.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75677\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-13.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 13\" width=\"354\" height=\"134\" \/><\/p>\n<p>Question 5.<br \/>\nThe given data regarding the motion of two different objects C and D is in a tabular form. Check them carefully and state whether the motion of the objects is uniform or non-uniform.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"68\"><strong>Time<\/strong><\/td>\n<td style=\"text-align: center\" width=\"110\"><strong>Distance travelled <\/strong><strong>by C (in m)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"109\"><strong>Distance travelled <\/strong><strong>by D (in m)<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"68\">9:30 AM<\/td>\n<td width=\"110\">10<\/td>\n<td width=\"109\">12<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">9:45 AM<\/td>\n<td width=\"110\">20<\/td>\n<td width=\"109\">19<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">10:00 AM<\/td>\n<td width=\"110\">30<\/td>\n<td width=\"109\">23<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">10:15 AM<\/td>\n<td width=\"110\">40<\/td>\n<td width=\"109\">35<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">10:30 AM<\/td>\n<td width=\"110\">50<\/td>\n<td width=\"109\">37<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">10:45 AM<\/td>\n<td width=\"110\">60<\/td>\n<td width=\"109\">41<\/td>\n<\/tr>\n<tr>\n<td width=\"68\">11:00 AM<\/td>\n<td width=\"110\">70<\/td>\n<td width=\"109\">44<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Answer:<br \/>\nWe can check the motion of the objects C and D by plotting the distance-time graph for the two objects.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75678\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-14.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 14\" width=\"294\" height=\"281\" \/><br \/>\nGraph the object C on x-axis<br \/>\nScale 1 cm = 15 min and on y-axis 1 cm = 10 m<br \/>\nSince, the distance-time graph of the object C is a straight line. Therefore, its motion is uniform.<br \/>\nGraph of object D<br \/>\nScale On x-axis, 1 cm = 15 min, On y-axis 1 cm=5m<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75679\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-15.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 15\" width=\"292\" height=\"273\" \/><br \/>\nSince, the distance-time graph of the object D is not a straight line, therefore, its motion is non-uniform.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Motion_and_Time_Class_7_Science_Extra_Questions_Miscellaneous_Questions\"><\/span>Motion and Time Class 7 Science Extra Questions Miscellaneous Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Multiple Choice Questions<\/strong><br \/>\nQuestion 1.<br \/>\nWhat is the relation between distance and speed?<br \/>\n(a) Distance = Speed \u00d7 Time<br \/>\n(b) Distance = Speed\/Time<br \/>\n(c) Distance = Time\/Speed<br \/>\n(d) None of the above<br \/>\nAnswer:<br \/>\n(a) Distance = Speed \u00d7 Time<\/p>\n<p>Question 2.<br \/>\nTwo students were asked to plot a distance-time graph for the motion described by Table A and Table B. [NCERT Exemplar]\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"124\"><strong>Distance moved (m)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"30\">0<\/td>\n<td style=\"text-align: center\" width=\"27\">10<\/td>\n<td style=\"text-align: center\" width=\"25\">20<\/td>\n<td style=\"text-align: center\" width=\"24\">30<\/td>\n<td style=\"text-align: center\" width=\"24\">40<\/td>\n<td style=\"text-align: center\" width=\"30\">50<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"124\"><strong>Time (min)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"30\">0<\/td>\n<td style=\"text-align: center\" width=\"27\">2<\/td>\n<td style=\"text-align: center\" width=\"25\">4<\/td>\n<td style=\"text-align: center\" width=\"24\">6<\/td>\n<td style=\"text-align: center\" width=\"24\">8<\/td>\n<td style=\"text-align: center\" width=\"30\">10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"124\"><strong>Distance moved (m)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"30\">0<\/td>\n<td style=\"text-align: center\" width=\"27\">5<\/td>\n<td style=\"text-align: center\" width=\"25\">10<\/td>\n<td style=\"text-align: center\" width=\"24\">15<\/td>\n<td style=\"text-align: center\" width=\"24\">20<\/td>\n<td style=\"text-align: center\" width=\"30\">25<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"124\"><strong>Time (min)<\/strong><\/td>\n<td style=\"text-align: center\" width=\"30\">0<\/td>\n<td style=\"text-align: center\" width=\"27\">1<\/td>\n<td style=\"text-align: center\" width=\"25\">2<\/td>\n<td style=\"text-align: center\" width=\"24\">3<\/td>\n<td style=\"text-align: center\" width=\"24\">4<\/td>\n<td style=\"text-align: center\" width=\"30\">5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-75680\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-16.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 16\" width=\"246\" height=\"192\" \/><br \/>\nThe graph given in figure is true for<br \/>\n(a) Both A and B<br \/>\n(b) Only A<br \/>\n(c) Only B<br \/>\n(d) Neither A nor B<br \/>\nAnswer:<br \/>\n(a) Since, speed is constant for A and S, so graph for A and 6 will be a straight line.<\/p>\n<p>Question 3.<br \/>\nHow will you convert the speed given in km\/h to m\/s?<br \/>\n(a) By multiplying with 5\/16<br \/>\n(b) By multiplying with 6\/5<br \/>\n(c) By multiplying with 18\/5<br \/>\n(d) By multiplying with 5\/18<br \/>\nAnswer:<br \/>\n(d) Conversion of km\/h into m\/s<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75681\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-17.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 17\" width=\"339\" height=\"66\" \/><\/p>\n<p>Question 4.<br \/>\nOn which axis is dependent variable represented?<br \/>\n(a) x-axis<br \/>\n(b) y-axis<br \/>\n(c) On any axis<br \/>\n(d) Depends on the data<br \/>\nAnswer:<br \/>\n(b) y-axis<\/p>\n<p>Question 5.<br \/>\nIf we denote speed by S, distance by D and time by T, the relationship between these Quantities is [NCERT Exemplar]\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75682\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-18.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 18\" width=\"269\" height=\"80\" \/><br \/>\nAnswer:<br \/>\n(d) \\(S=\\frac{1}{T} \\times D\\)<\/p>\n<p>Question 6.<br \/>\nWhich one records the distance travelled by a vehicle?<br \/>\n(a) Speedometer<br \/>\n(b) Manometer<br \/>\n(c) Motometer<br \/>\n(d) Odometer<br \/>\nAnswer:<br \/>\n(d) Odometer<\/p>\n<p>Question 7.<br \/>\nThe correct symbol to represent the speed of an object is<br \/>\n(a) 5 m\/s<br \/>\n(b) 5 mp<br \/>\n(c) 5 m\/s<sup>-1<\/sup><br \/>\n(d) 5 s\/m<br \/>\nAnswer:<br \/>\n(a) 5 m\/s<\/p>\n<p>Question 8.<br \/>\nThe distance-time graph for the motion of an object moving with a constant speed is<br \/>\n(a) a curved line leaving towards x-axis<br \/>\n(b) a curved line inclined towards y-axis<br \/>\n(c) a straight line inclined at some angles towards x-axis<br \/>\n(d) None of the above<br \/>\nAnswer:<br \/>\n(c) a straight line inclined at some angles towards x-axis<\/p>\n<p>Question 9.<br \/>\nFigure shows an oscillating pendulum.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75683\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-19.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 19\" width=\"174\" height=\"152\" \/><br \/>\nTime taken by the bob to move from A to C is t<sub>1<\/sub> and from C to O is t<sub>2<\/sub>. The time period of this simple pendulum is [NCERT Exemplar]\n(a) (t<sub>1<\/sub> + t<sub>2<\/sub>)<br \/>\n(b) 2(t<sub>1<\/sub> + t<sub>2<\/sub>)<br \/>\n(c) 3 (t<sub>1<\/sub> + t<sub>2<\/sub>)<br \/>\n(d) 4(t<sub>1<\/sub> + t<sub>2<\/sub>)<br \/>\nAnswer:<br \/>\n(d)As from A to O, \\(\\frac{1}{4}\\)th time of one full cycle of time is required, so time period will be 4 (t<sub>1<\/sub> + t<sub>2<\/sub>.<\/p>\n<p>Question 10.<br \/>\nThe distance-time graph for a vehicle standing on a road side will be<br \/>\n(a) straight line inclined by some angle to x-axis<br \/>\n(b) straight line parallel to x-axis<br \/>\n(c) straight line parallel to y-axis<br \/>\n(d) None of the above<br \/>\nAnswer:<br \/>\n(b) straight line parallel to x-axis<\/p>\n<p>Question 11.<br \/>\nBoojho walks to his school which is at a distance of 3 km from his home in 30 min. On reaching, he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 min. His average speed in km\/h is [NCERT Exemplar]\n(a) 8.3<br \/>\n(b) 7.2<br \/>\n(c) 5<br \/>\n(d) 3.6<br \/>\nAnswer:<br \/>\n(b) Given, total distance = 3+ 3 = 6km, total time = 30 + 20 = 50 min<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75684\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-20.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 20\" width=\"307\" height=\"69\" \/><\/p>\n<p>Question 12.<br \/>\nA bus travels 54 km in 90 min. The speed of the bus is<br \/>\n(a) 0.6 m\/s<br \/>\n(b) 10 m\/s<br \/>\n(c) 5.4 m\/s<br \/>\n(d) 3.6 m\/s<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75685\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-21.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 21\" width=\"525\" height=\"50\" \/><\/p>\n<p>Question 13.<br \/>\nObserve the given figure.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75686\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-22.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 22\" width=\"144\" height=\"150\" \/><br \/>\nThe time period of a simple pendulum is the time taken by it to travel from<br \/>\n(a) A to 8 and back to A<br \/>\n(b) O to A, A to 8 and 8 to A<br \/>\n(c) 8 to A, A to 8 and 8 to O<br \/>\n(d) A to 8<br \/>\nAnswer:<br \/>\n(a) Time period of a simple pendulum is the total time taken to complete one full cycle.<\/p>\n<p>Question 14.<br \/>\nWhich of the following cannot be used for the measurement of time? [NCERT Exemplar]\n(a) A leaking tap<br \/>\n(b) Simple pendulum<br \/>\n(c) Shadow of an object during the day<br \/>\n(d) Blinking of eyes<br \/>\nAnswer:<br \/>\n(d) Blinking of eyes<\/p>\n<p>Question 15.<br \/>\nTwo clocks A and B are shown in figure. Clock A has an hour and a minute hand whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks? [NCERT Exemplar]\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-75687\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Motion-and-Time-Class-7-Extra-Questions-Science-Chapter-13-23.png\" alt=\"Motion and Time Class 7 Extra Questions Science Chapter 13 23\" width=\"222\" height=\"119\" \/><br \/>\n(a) A time interval of 30 s can be measured by clock A.<br \/>\n(b) A time interval of 30 s cannot be measured by clock B<br \/>\n(c) Time interval of 5 min can be measured by both A and B<br \/>\n(d) Time interval of 4 min 10 s can be measured by clock A<br \/>\nAnswer:<br \/>\n(c) Time interval of 5 min can be measured by both A and B<\/p>\n<p><strong>Fill in the Blanks<\/strong><br \/>\n1. The distance covered by an object in a \u2026\u2026\u2026\u2026\u2026\u2026.. is called its speed.<br \/>\n2. Time between one sunrise and the next sunrise was called a \u2026\u2026\u2026\u2026\u2026\u2026.. .<br \/>\n3. In a simple pendulum, the metallic ball suspended by thread is called its \u2026\u2026\u2026\u2026\u2026\u2026.. .<br \/>\n4. Time period of a pendulum depends on its \u2026\u2026\u2026\u2026\u2026\u2026.. .<br \/>\n5. The symbols of all units are written in \u2026\u2026\u2026\u2026\u2026\u2026.. .<br \/>\n6. A \u2026\u2026\u2026\u2026\u2026\u2026.. is one billionth of a second.<br \/>\n7. Motion of objects can be represented in the pictorial form by their \u2026\u2026\u2026\u2026\u2026\u2026.. graph.<br \/>\n8. The distance-time graph for the motion of an object moving with a constant speed is a \u2026\u2026\u2026\u2026\u2026\u2026..<br \/>\nAnswers:<br \/>\n1. unit time<br \/>\n2. day<br \/>\n3. bob<br \/>\n4. length<br \/>\n5. singular<br \/>\n6. nanosecond<br \/>\n7. distance-time<br \/>\n8. straight line<\/p>\n<p><strong>True\/False<\/strong><br \/>\n1. The motion of a spinning top is rotational motion.<br \/>\n2. The smallest time interval that can be measured with commonly available clocks and watches is one second.<br \/>\n3. The time period of simple pendulum is not constant.<br \/>\n4. Faster vehicle has a higher speed.<br \/>\n5. All the clocks make use of some periodic motion.<br \/>\n6. The basic unit of speed is km\/h.<br \/>\n7. The symbols of all units are written in singular.<br \/>\n8. The basic unit of time is second.<br \/>\n9. The distance-time graph of standing vehicle is a straight line parallel to x-axis.<br \/>\n10. Periodic events are used for the measurement of time.<br \/>\nAnswers:<br \/>\n1. True<br \/>\n2. True<br \/>\n3. True<br \/>\n4. True<br \/>\n5. True<br \/>\n6. False, the basic unit of speed is m\/s<br \/>\n7. True<br \/>\n8. True<br \/>\n9. True<br \/>\n10. True<\/p>\n<p><strong>Match the Columns<\/strong><br \/>\nQuestion 1.<br \/>\nMatch the Column I with Column II.<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"110\"><strong>Column I<\/strong><\/td>\n<td style=\"text-align: center\" width=\"145\"><strong>Column II<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(a) Years<\/td>\n<td width=\"145\">(i) rotation period of the earth on its axis<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(b) Hour<\/td>\n<td width=\"145\">(ii) time to complete 100 m race<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(c) Minute<\/td>\n<td width=\"145\">(iii) gestation period in humans<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(d) Days<\/td>\n<td width=\"145\">(iv) age of a person<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(e) Second<\/td>\n<td width=\"145\">(v) in scientific research<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(f) Month<\/td>\n<td width=\"145\">(vi) time to reach your school<\/td>\n<\/tr>\n<tr>\n<td width=\"110\">(g) Microseconds<\/td>\n<td width=\"145\">(vii) train reaches from one city to other<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Answers:<br \/>\n1.<br \/>\n(a)-(iv)<br \/>\n(b)-(viii)<br \/>\n(c)-(vi)<br \/>\n(d)-(i)<br \/>\n(e)-(ii)<br \/>\n(f)-(iii)<br \/>\n(g)-(v)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Motion and Time Class 7 Extra Questions Science Chapter 13 Motion and Time Class 7 Science Extra Questions Very Short [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Class 7 Science Chapter 13 Motion and Time Extra Questions","_yoast_wpseo_title":"Class 7 Science Chapter 13 Motion and Time Extra Questions","_yoast_wpseo_metadesc":"Get extra science questions on motion and time for Class 7 science chapter 13, to improve your understanding of this 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