Among the given distancetime graphs, following graph shows the movement of a truck with speed which is not constant:
It is so because in this graph vehicle is not covering equal distances in equal intervals of time.
The steps to be followed are as follows:
(Here, distance may vary in centimeters due to difference in the size of photographs taken. So, follow only the method for finding right answer, which may vary.)
Therefore, distance travelled = 0.5 cm x 100m = 50m
Therefore, speed = 50m / 10s = 5 m/s
Correct option is (iv).
Explanation: Speed is the distance traveled per unit of time. The standard unit of distance is metre (m) and standard unit of time is second (s).
Correct option is (ii).
Explanation: Speed is the distance traveled per unit of time.
Among the vehicles, vehicle A is moving faster than B. It is so because A has travelled greater distance in shorter period of time in comparison to that of vehicle B. Vehicle B has moved lesser distance in greater period of time as depicted in graph.
Average speed of car = (40 km/h + 60 km/h)/2 = 50 km/h
Total distance travelled = speed × total time taken = 50 km/h × (½) h = 25 km/h
Time taken by Salma = 15 min = 15 × 60 s = 900 s
Speed of bicycle = 2 m/s
Let the distance between school and house be x m
Distance travelled = time taken × speed
∴ Distance, x = 900 s × 2 m/s = 1800 m = 1.8 km
Following statements are not correct:
(ii) Every object moves with a constant speed.
(v) The speed of a train is expressed in m/h.
S.No. 
Straight Line Motion 
Circular Motion 
Oscillatory Motion 
1. 
Motion of a horse pulling a cart on a straight road. 
Motion of a child in a merrygoround. 
Motion of your hands while running. 
2. 
Motion of a train on a straight bridge. 

Motion of a child on a seesaw. 
3. 


Motion of the hammer of an electric bell. 
Yes, the NCERT book has been designed keeping in mind the pattern of paper that will be presented in the exam to students. The NCERT book is sufficient to study for the exam as it has everything related to the exam and contains all information out of which the questions will be asked in the exam. But if you want to prepare a little bit extra, we suggest that you go through the NCERT class 7 solutions.
When you are studying the NCERT book for math and other subjects for your class 7 exams, refer to the NCERT class 7 solutions simultaneously so you can see where you are going wrong and what are you getting right in your exercises’ attempt.
The class 7th is very crucial as it is among the major middle school classes during which the child’s base is formed in math and science and even in other subjects like English. Thus, it is students must study smartly in this class and ace their exams while getting all the help they need from the NCERT 7 solutions given by Extramarks.
Yes, absolutely. The NCERT solutions provided by Extramarks for class 7 are eloquent and elaborate at best and are thus useful for students studying for the final exams of class 7. The students will have many questions and doubts regarding the NCERT solutions for class 7 and this is why the solutions have been elaborated well to help students understand the answers to exercises.
Yes, the NCERT solutions for Math and other subjects for class 7 are available for free from Extramarks.
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