{"id":13022,"date":"2020-09-01T10:06:59","date_gmt":"2020-09-01T04:36:59","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=13022"},"modified":"2021-07-02T15:04:04","modified_gmt":"2021-07-02T09:34:04","slug":"kseeb-solutions-for-class-7-science-chapter-13","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/kseeb-solutions-for-class-7-science-chapter-13\/","title":{"rendered":"KSEEB Solutions for Class 7 Science Chapter 13 Motion and Time"},"content":{"rendered":"

Students can Download Chapter 12 Reproduction in Plants Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science<\/a>, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations.<\/p>\n

Karnataka State Syllabus Class 7 Science Chapter 13 Motion and Time<\/h2>\n

Class 7 Science Motion and Time NCERT Textbook Questions and Answers<\/h3>\n

Question 1.
\nClassify the following as motion along a straight line, circular or oscillatory motion:
\n(i) Motion of your hands while running.
\nAnswer:
\nOscillatory motion.<\/p>\n

(ii) Motion of a horse pulling a cart on a straight road.
\nAnswer:
\nStraight line motion.<\/p>\n

(iii) Motion of a child in a merry-go-round.
\nAnswer:
\nCircular motion.<\/p>\n

(iv) Motion of a child on a see-saw.
\nAnswer:
\nOscillatory motion.<\/p>\n

(v) Motion of the hammer of an electric bell.
\nAnswer:
\nOscillatory motion.<\/p>\n

(vi) The motion of a train on a straight bridge.
\nAnswer:
\nStraight-line motion.<\/p>\n

Question 2.
\nWhich of the following are not correct?
\n(i) The basic unit of time is second.
\nAnswer:
\nCorrect.
\n(ii) Every object moves at a constant speed.
\nAnswer:
\nNot Correct.<\/p>\n

(iii) Distances between the two cities are measured in kilometres.
\nAnswer:
\nCorrect.<\/p>\n

(iv) The time period of a given pendulum is not constant.
\nAnswer:
\nNot Correct.<\/p>\n

(v) The speed of a train is expressed in m\/h.
\nAnswer:
\nNot Correct.<\/p>\n

Question 3.
\nA simple pendulum takes 32s to complete 20 oscillations. What is the time period of the pendulum?
\nAnswer:
\nGiven
\nNumber of Oscillations = 20
\nTotal time taken to complete 20 oscillations = 32s.
\n\"KSEEB<\/p>\n

Question 4.
\nThe distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
\nGiven,
\ndistance between the two stations = 240 km
\nTime taken = 4h
\n\"KSEEB<\/p>\n

Question 5.
\nThe odometer of a car reads 57321.0 km when the clock shows the time at 08 : 30 AM. What is the distance moved by car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km\/min during this time. Express the speed in km\/h also.
\nAnswer:
\nGiven,
\nThe initial reading of the odometer of the car = 57321.0 km.
\nThe final reading of the odometer of the car = 57336.0 km
\nDistance covered by the car = Final reading initial reading
\n= 57336.0 – 5 7321.0 = 15 km
\nThe given car starts at 8 : 30 a.m. and stops at 8 : 50 a.m.
\nTherefore, the time taken by the car to cover the distance is (8 : 50 – 8 : 30) min = 20 min.
\ni. e., distance = 15 km.
\nTime taken = 20 min
\nspeed in km\/min
\n\"KSEEB<\/p>\n

Question 6.
\nSalina takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m\/s, calculate the distance between her house
\nAnswer:
\nTime taken by Salma to reach her school from her home = 15 min = 15 \u00d7 60 = 900s
\nSpeed of her bicycle = 2m s
\n\"KSEEB<\/p>\n

Question 7.
\nShow the shape of the distance-time graph for die motion in the following cases:
\nAnswer:
\n(i) A car moving at a constant speed.
\n\"KSEEB<\/p>\n

(ii) A car parked on a side road.
\n\"KSEEB<\/p>\n

Question 8.
\nWhich of dying following relations is correct?
\nAnswer:
\n\"KSEEB<\/p>\n

Question 9.
\nThe basic unit of speed is:
\n(i) km\/min
\n(ii) m\/min
\n(iii) km\/h
\n(iv) m\/s
\nAnswer:
\n(iv) m\/s<\/p>\n

Question 10.
\nA car moves with a speed of 40 km\/h for 15 minutes and then with a speed of 60 km\/h for the next 15 minutes. The total distance covered by the car is:
\n(i) 100 km
\n(ii) 25 km
\n(iii) 15 km
\n(iv) 10 km
\nSolution:
\n(ii) 25 km
\nCase I:
\nspeed = 40 km \/ h
\ntime = 15 min = 16\/60 hour
\nDistance = speed \u00d7 Time
\n\\(=40 \\mathrm{x} \\frac{15}{60}\\)
\n= 10 km,
\nspeed = 60 km\/h
\nTime = 15 min = 15\/60 hour
\ndistance = speed \u00d7 Time
\n\\(=60 \\times \\frac{15}{60}\\)
\n= 15 km
\nTotal distance = 10 km +15 km
\n= 25 km<\/p>\n

Question 11.
\nSuppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had been taken at an interval of 10 seconds. If a distance of 100 meters is shown by 1 cm in these photographs, calculate the speed of the blue car.
\nAnswer:
\nFrom figures 13.1 and 13.2 we conclude that the distance covered by the blue car is 2 cm.
\nSo, the distance covered = 2 \u00d7 100 m = 200m
\nTime Taken = 10 seconds
\n\"KSEEB<\/p>\n

Question 12.
\nFig. 13.15 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?
\nAnswer:
\nVehicle A is moving faster than the vehicle
\nSpeed is given by the relation.
\n\"KSEEB
\n\"KSEEB
\nThis relation shows that the speed of a vehicle is greater if it covers a greater distances in a given interval of time. To compare the distance, draw a line perpendicular to the time – axis, as shown in the following distance-time graph.
\n\"KSEEB
\nFrom the graph, it is evident that for a given time t1<\/sub>, the distance covered by vehicle A is greater than that covered by vehicle B. Hence, vehicle A is moving faster than vehicle B.<\/p>\n

Question 13.
\nWhich of the following distance-time graphs shows a truck moving with a speed which is not constant?
\n\"KSEEB<\/p>\n

Class 7 Science Motion and Time Additional Important Questions and Answers<\/h3>\n

Question 1.
\nWhat is motion? How many types of motion? Name them.
\nAnswer:
\nThe object or a person transfer from one place to another is known as motion. There are 3 types of motion.
\nThey are<\/p>\n

    \n
  1. motion along a straight line<\/li>\n
  2. Circular and<\/li>\n
  3. periodic<\/li>\n<\/ol>\n

    Question 2.
    \nDefine speed, what is the unit of speed?
    \nAnswer:
    \nThe distance covered by an object in unit time is known as speed.
    \n\"KSEEB
    \nThe unit of speed is meter\/second.<\/p>\n

    Question 3.
    \nHow do you measure the time?
    \nAnswer:
    \nTime is measured by using the oscillatory motions of the pendulum. The clocks and watches are measures the time.<\/p>\n

    Question 4.
    \nDefine the time period?
    \nAnswer:
    \nThe time taken by the pendulum to complete one oscillation is called its time period<\/p>\n

    Question 5.
    \nHow do you write the symbols?
    \nAnswer:
    \nThe symbols of all units are written in the singular.
    \nFor eg: 60 km not 40 kms.<\/p>\n

    Question 6.
    \nName the devices used before the pendulum clocks.
    \nAnswer:
    \nSundial, water clocks, Sand clocks are some examples of devices used to measure the time in olden times.
    \nDifferent designs of these devices were developed in different parts of the world.<\/p>\n

    Question 7.
    \nWhat are the uses of the distance-time graph?
    \nAnswer:
    \nThe uses of distance-time graphs are :<\/p>\n

      \n
    1. The nature of motion is given at a glance.<\/li>\n
    2. The relative motion at various intervals can<\/li>\n
    3. The region of acceleration or retardation can be estimated without any calculation.<\/li>\n
    4. The distance of the moving body at any time unit can be calculated.<\/li>\n<\/ol>\n

      Question 8.
      \nDefine speedometer and odometer.
      \nAnswer:
      \nA speedometer is a device in vehicles it records the speed of the vehicle directly in kilometer\/hour. An odometer that measures the distance travelled (moved) by the vehicle.<\/p>\n

      Question 9.
      \nDefine uniform and non – uniform motion.
      \nAnswer:
      \nIf the speed of an object moving along a straight line keeps changing, its motion is called non – uniform. An object moving along a straight line with a constant speed is said to be
      \nin uniform motion.<\/p>\n

      Question 10.
      \nDefine a simple pendulum, with a neat diagram.
      \nAnswer:
      \n\"KSEEB
      \nA simple pendulum consists of a small metallic ball suspended from a rigid stand by a thread. The metallic ball is called the bob of the pendulum.<\/p>\n

      Question 11.
      \nHow the simple pendulum performs an oscillatory motion?
      \nAnswer:
      \nWhen the bob of the pendulum is released after taking it slightly to one side, it begins to move to and fro. The to and fro motion of a simple pendulum is an example of periodic or oscillatory motion.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Students can Download Chapter 12 Reproduction in Plants Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations. Karnataka State Syllabus Class 7 Science Chapter 13 Motion and Time Class 7 Science Motion and Time NCERT Textbook …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/13022"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=13022"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/13022\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=13022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=13022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=13022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}