{"id":129195,"date":"2021-02-18T08:22:22","date_gmt":"2021-02-18T08:22:22","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=129195"},"modified":"2023-09-15T08:22:45","modified_gmt":"2023-09-15T08:22:45","slug":"ncert-solutions-for-7th-class-science-chapter-13-motion-and-time","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-7th-class-science-chapter-13-motion-and-time\/","title":{"rendered":"NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time"},"content":{"rendered":"\n

Class 7: Science Chapter 13 solutions. Complete Class 7 Science Chapter 13 Notes.<\/p>\n\n\n\n

NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time<\/strong><\/h2>\n\n\n\n

NCERT 7th Science Chapter 13, class 7 Science Chapter 13 solutions<\/p>\n\n\n\n

Page No: 156<\/p>\n\n\n\n

Exercises<\/h2>\n\n\n\n

1. Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(i) Oscillatory motion<\/p>\n\n\n\n

(ii) Straight line motion<\/p>\n\n\n\n

(iii) Circular motion <\/p>\n\n\n\n

(iv) Oscillatory motion <\/p>\n\n\n\n

(v) Oscillatory motion <\/p>\n\n\n\n

(vi) Straight line motion<\/p>\n\n\n\n

2. Which of the following are not correct?
(i) The basic unit of time is second.
(ii) Every object moves with a constant speed.
(iii) Distances between two cities are measured in kilometres.
(iv) The time period of a given pendulum is not constant.
(v) The speed of a train is expressed in m\/h.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(i) Correct <\/p>\n\n\n\n

(ii) Not correct <\/p>\n\n\n\n

Every object may or may not moves with a constant speed.<\/p>\n\n\n\n

(iii) Correct<\/p>\n\n\n\n

(iv) Not correct <\/p>\n\n\n\n

Time period of a given pendulum is always constant because it depends on the length of the pendulum..<\/p>\n\n\n\n

(v) Not correct<\/p>\n\n\n\n

The speed of a train is measured in km\/h or in m\/s.<\/p>\n\n\n\n

3. A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Numbers of oscillations = 20<\/p>\n\n\n\n

Time taken = 32 sec<\/p>\n\n\n\n

Time period of the pendulum = Time taken\/Numbers of oscillations = 32\/20 = 1.6 s.<\/p>\n\n\n\n

4. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Distance between two stations = 240 km
Time taken = 4 hrs
Speed of train = Distance\/Time taken = 240\/4 = 60 km\/hr<\/p>\n\n\n\n

5. The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the 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.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Initial reading of odometer = 57321.0 km
Final reading of odometer = 57336.0 km
Initial Time = 8:30 AM
Final Time = 8:50 AM
Total distance covered = Final reading of odometer – Initial reading of odometer
                                   =57336.0 – 57321.0 = 15.0 km<\/p>\n\n\n\n

Total time taken = Final Time – Initial Time =  8:50 AM – 8:30 AM = 20 minutes<\/p>\n\n\n\n

20 minutes = 20\/60 hrs = 1\/3 hrs<\/p>\n\n\n\n

Speed of the car = Total distance covered\/Total time taken = 15.0\/20 = 0.75 km\/min<\/p>\n\n\n\n

Speed of the car in km\/hr =15\/(1\/3) = 45 km\/hr<\/p>\n\n\n\n

6. Salma 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 and the school.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Speed of bicycle = 2 m\/s
Time taken = 15 mins = 15 \u00d7 60 secs = 900 secs
A\/q,
Speed = Distance\/Time
\u21d2 Distance = Speed \u00d7 Time = 2 \u00d7 900 metres = 1800 metres = 1.8 km<\/p>\n\n\n\n

7. Show the shape of the distance-time graph for the motion in the following cases:
(i) A car moving with a constant speed.
(ii) A car parked on a side road.<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(i)The graph will be a straight line passing through the origin.<\/p>\n\n\n\n

\"NCERT<\/figure>\n\n\n\n

(ii) The graph is a straight line parallel to x-axis or time axis. <\/p>\n\n\n\n

\"NCERT<\/figure>\n\n\n\n

8. Which of the following relations is correct?
(i) Speed = Distance \u00d7 Time 
(ii) Speed = Distance\/Time
(iii) Speed = Time\/Distance 
(iv) Speed = 1\/Distance \u00d7 Time<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(ii) Speed = Distance\/Time<\/p>\n\n\n\n

Page No: 157<\/p>\n\n\n\n

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

Answer<\/strong><\/p>\n\n\n\n

(iv) m\/s<\/p>\n\n\n\n

10. A 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:
(i) 100 km 
(ii) 25 km
(iii) 15 km 
(iv) 10 km<\/strong><\/p>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

(ii) 25 km
 
Firstly, the car is moving with 40km\/h for 15 minutes.<\/p>\n\n\n\n

15 minutes = 15\/60 hrs = 1\/4 hrs<\/p>\n\n\n\n

Distance covered = 40 \u00d7 1\/4 = 10 km<\/p>\n\n\n\n

Secondly, the car is moving with 60km\/h for 15 minutes.Distance covered = 60 \u00d7 1\/4 = 15 km <\/p>\n\n\n\n

Total distance covered = 10 km + 15 km = 25 km<\/p>\n\n\n\n

11. Suppose 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 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.<\/strong><\/p>\n\n\n\n

\"NCERT<\/figure>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

First, measure the distance with the help of scale and then proceed as given below.
Suppose the distance measured by scale is 2cm.
Multiply 2 with 100 to get the actual distance = 2 \u00d7 100 = 200 m.    (1cm = 100m)
Interval time between the photos taken = 10 s.
Speed of the blue car = 200\/10 m\/s = 20 m\/s<\/p>\n\n\n\n

12. Fig. 13.15 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?<\/strong><\/p>\n\n\n\n

\"NCERT<\/figure>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Vehicle A is moving faster because it has more slope than vehicle B. In distance-time graph, speed is measured by its slope.<\/p>\n\n\n\n

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

\"NCERT<\/figure>\n\n\n\n

Answer<\/strong><\/p>\n\n\n\n

Option (iii) because the slope of the graph is not a straight line and hence it does not show a uniform motion.<\/p>\n\n\n\n

NCERT 7th Science Chapter 13, class 7 Science Chapter 13 solutions<\/p>\n\n\n\n

NCERT Solutions for 7th Class Science: Chapter 13: Download PDF<\/strong><\/h2>\n\n\n\n

NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time<\/p>\n\n\n\n

Download PDF<\/strong>: NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time PDF<\/a><\/p>\n\n\n\n

Chapter-wise NCERT Solutions Class 7 Science<\/h2>\n\n\n\n
Chapter 1 Nutrition in Plants<\/a><\/td><\/tr>
Chapter 2 Nutrition in Animals<\/a><\/td><\/tr>
Chapter 3 Fibre to Fabric<\/a><\/td><\/tr>
Chapter 4 Heat<\/a><\/td><\/tr>
Chapter 5 Acids, Bases and Salts<\/a><\/td><\/tr>
Chapter 6 Physical and Chemical Changes<\/a><\/td><\/tr>
Chapter 7 Weather, Climate and Adaptations of Animals to Climate<\/a><\/td><\/tr>
Chapter 8 Winds, Storms and Cyclones<\/a><\/td><\/tr>
Chapter 9 Soil<\/a><\/td><\/tr>
Chapter 10 Respiration in Organisms<\/a><\/td><\/tr>
Chapter 11 Transportation in Animals and Plants<\/a><\/td><\/tr>
Chapter 12 Reproduction in Plants<\/a><\/td><\/tr>
Chapter 13 Motion and Time<\/a><\/td><\/tr>
Chapter 14 Electric Current and Its Effects<\/a><\/td><\/tr>
Chapter 15 Light<\/a><\/td><\/tr>
Chapter 16 Water: A Precious Resource<\/a><\/td><\/tr>
Chapter 17 Forests: Our Lifeline<\/a><\/td><\/tr>
Chapter 18 Wastewater Story<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n


<\/strong>About NCERT<\/h2>\n\n\n\n

The National Council of Educational Research and Training is an autonomous organization of the Government of India which was established in 1961 as a literary, scientific, and charitable Society under the Societies Registration Act. Its headquarters are located at Sri Aurbindo Marg in New Delhi. Visit the Official NCERT website<\/a> to learn more. <\/p>\n\n\n\n

\n
NCERT Solutions<\/a><\/div>\n\n\n\n
NCERT Solutions for Class 7<\/a><\/div>\n\n\n\n
NCERT Solutions for Class 7 Science<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Class 7: Science Chapter 13 solutions. Complete Class 7 Science Chapter 13 Notes. NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time NCERT 7th Science Chapter 13, class 7 Science Chapter 13 solutions Page No: 156 Exercises 1. Classify the following as motion along a straight line, circular or oscillatory motion:(i) Motion of your […]<\/p>\n","protected":false},"author":302,"featured_media":627364,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1411,907,1],"tags":[1542],"boards":[1180],"class_list":["post-129195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-book-solutions","category-class-7","category-general","tag-ncert-science-class-7","boards-ncert","entry"],"yoast_head":"\nNCERT Solutions Class 7, Science Chapter 13 - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time | Browse all Class 7 Science Solutions of NCERT books- IndCareer Schools\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-solutions-for-7th-class-science-chapter-13-motion-and-time\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions for 7th Class Science: Chapter 13-Motion and Time\" \/>\n<meta property=\"og:description\" content=\"Class 7: Science Chapter 13 solutions. 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