NCERT Solutions for Class 7 Science Chapter 13 Motion And Time

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Updated at 2021-02-11


NCERT solutions for class 7 Science Chapter 13 Motion And Time Exercise

Q.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.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(i) oscillatory
(ii) Motion along a straight line
(iii) Circular motion
(iv) Oscillatory motion
(v) Oscillatory motion
(vi) Motion along a straight line.

Q.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 constant.
(v) The speed of a train is expressed in m/h.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(ii) , (iv), (v)

Q.3 A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Number of oscillations = 20
Total time taken to complete 20 oscillations = 32 s
Time period = totaltimetakennumberofoscillation=3220

Q.4 The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Distance = 240 km
Time taken = 4 hours
Speed =Distance covered/time taken = 240km/4 hammer =60 km/h
Speed of train =60 km/h

Q.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.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Distance = 57336.0 km – 57321 km =15 km
Speed =15km20min=34km/min
Speed in km/hr =34 × 60
=(15 x 3) km/hr =45 km/hr.

Q.6 Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/min, calculate the distance between her house and the school.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Time taken =15 min
Speed = 2 m/min .
Distance = speed x time = 2 x 15 = 30 m

Q.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



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Q.8 Which of the following relations is correct?
(i) Speed = Distance × Time
(ii) Speed = Distance/Time
(iii)Speed – Time/Distance
(iv)Speed = 1/Distance ×Time



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(ii) Speed = Distance/Time

Q.9 The basic unit of speed is:
(i) km/min
(ii) m/min
(iii) km/h
(iv) m/s



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(iii) km/h

Q.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



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(ii) 25 km

Q.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 fastest car.



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Distance travelled by the car = 120 m
Time taken to cover this distance = Time interval between the two photographs = 10 s
Speed = distance/time = 120/10 = 12m /sec

Q.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?



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

Vehicle A is moving faster

Q.13 Which of the following distance-time graphs shows a truck moving with speed which is not constant?



NCERT Solutions for Class 7 Science Chapter 13 Motion And Time


Answer :

(iii)



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