운동과 시간 챕터 13 7학년 과학

Q1. In a school athletic meet, a boy ran at a speed of 2m/s and stood first in a 200m race. How much distance is covered by him per second? Q2. Rahul and Rijul are going on the excursion. They both have to go to the same place and cover a certain distance but in different cars. If Rahul covers a certain distance in one hour and Rijul covers the same distance in two hours. Who travels with a higher speed? Q.3. A simple pendulum takes 32s to complete 20 oscillations. What is the time period of the pendulum? Q. 4. The distance between the two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train. Q. 5 The basic unit of speed is: (i) km/min (ii) m/min (iii) km/h (iv) m/s Q6. Define the following terms: A) Distance B) Time: C) Speed: D) Uniform Motion: E) Average Speed Q. 7. Change 20 m/s to km/h Q.8. Change 54km/h to m/s Q.9. An electric train is moving at a speed of 30m/s. How much distance will it travel in the 30s? Q.10. A bus takes 30 minutes to travel a distance of 25 km. Calculate the speed of the bus in km/h? Q.11. A train is traveling at a speed of 110km/h. How long will it take to complete a journey of 605 km, without any stoppage in between? Q.12. The time taken for 20 oscillations is 40 seconds. Calculate the time period of a simple pendulum. Q.13. Plot the graph from the following data: Also answer the following question: What is the type of motion shown in the graph? Q.14 Vani takes 2h to reach Jalandhar from Amritsar by car. If speed of her car is 40km/h., calculate the distance between Jalandhar and Amritsar. Q.15. You are going to a hill station by car. You are very excited to reach there early and want to cover more distance quickly. You are asking your dad about the distance covered so far again and again. Your father told you about a device in a car which can measure the distance covered by car. Can you name that device? Q.16. Show the shape of the distance-time graph for the motion in the following cases: (a) A car moving with a constant speed (b) A car parked on a side road Q.17. Which of the following relations is correct? (a) Speed = Distance x Time (b) Speed = Distance/Time (c) Speed= Time/Distance (d) Speed=1/Distance x Time

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