Ncert- science – class 7- Chapter 9 – Motion and Time 1 Welcome to your Ncert- science – class 7- Chapter 9 – Motion and Time 1 1. Pendulum has a ___a____and a metallic _____b_____ which exhibits ____c_____ motion. Pendulums having ____d_____ length of strings have equal ____e____. What are 'a', 'b', 'c', 'd' and 'e' respectively? string, bob, periodic, equal, speed bob, string, oscillatory, equal, time period string, bob, oscillatory, equal, time period string, bob, non-uniform, equal, time period None 2. If an object A covers a distance in less time and another object covers the same distance in more time then A is ____a______ object and B is _____b_____ object? What are 'a' and 'b' respectively? fast moving, slow moving non-uniform moving, uniform moving uniform moving, non-uniform moving slow moving, fast moving None 3. A man walking at 3/4th of his usual speed reaches his office 15 minutes late. What is the usual time taken by him to reach the office? 40 minutes 45 minutes 35 minutes 50 minutes None 4. A train travels the first 15 km at a uniform speed of 30 km/hr, the next 75 km at a uniform speed of 50 km/hr and the last 10 km at a uniform speed of 20 km/hr. Calculate its average speed for the entire journey. 75 km/hr 100 km/hr 20 km/hr 40 km/hr None 5. If a distance-time graph is drawn from the data given below in the table, then what will be the shape of it?Time and DistanceTimeDistance (km)9:00 am09:10 am29:20 am49:30 am6 Curved line S-shape Bell shape Straight line None 6. The value 126 km/hr is the same as 20 m/s 30 m/s 25 m/s 35 m/s None 7. At 9:30 am, an odometer reading was 37, 625.0 km. What is the distance covered by the car, if at 10:40 am the reading was 37, 670.0 km. Also, calculate the speed of the car in km/min. 45 km, 0.64 km/min 145 km, 23.7 km/min 45 km, 0.21 km/min 45 km, 38.57 km/min None 8. A 100 m long train crosses a 10 m long bridge at a speed of 70 km/hr. How much time will it take to cross the bridge completely? 5.35 s 5.05 s 165 s 5.65 s None 9. Which of the following sentences is false regarding uniform motion? Periodic motion is uniform. It is exhibited by objects moving along a straight line. Speed is constant. Average speed is equal to actual speed. None 10. A simple pendulum takes 40 s to complete 20 oscillations. What is its time period? 4s 5s 2s 3s None 11. Rajan swims in a 60 m wide pool. He covers 120 m in one minute by swimming from one end to the other, and back along a straight path. What will be his average speed and average velocity, respectively? 0 ms-1, 2 ms–1 2 ms-1, 0 ms-1 None of these 0 ms–1, 0 ms–1 None 12. Which of the following is an example of uniform motion? A bus on its way through the busy market Walking on a busy street A horse running in a race A train going along the tracks at steady speed None 13. Which of the following is a true sentence about speedometer or odometer? A speedometer also gives information about the distance travelled. An odometer records speed directly in km/h. A speedometer records the speed directly in km/sec. Both speedometer and odometer can be seen in vehicles like motorcycle and scooter. None 14. The distance between two stations is 300 km. A train takes 5 hours to cover this distance. What is the speed of the train? 50 km/hr 70 km/hr 40 km/hr 60 km/hr None 15. Which of the following are the instruments used to measure speed and distance respectively? Speedometer, Anemometer Speedometer, Odometer Odometer, Anemometer Odometer, Speedometer None 16. Which of the following is/are present in a quartz clock? a. Electric circuitb. Micro-pendulumc. Sundials d. Cells a and d a and c a and b Only a None 17. Which of the following options is true for the descending order of units of distance? (a) Metre(b) Centimetre(c) Kilometre (b) > (a) > (c) (a) > (c) > (b) (c) > (a) > (b) (a) > (b) > (c) None 18. Sometimes it is required to measure time interval in smaller units. Which of the following equals one billionth of a second? Picosecond Nanosecond Millisecond Microsecond None 19. Which one of the following devices records the speed directly in km/h? Hygrometer Speedometer Thermometer Odometer None 20. When ____A_____ of a ____B_____ starting from its mean position O, moves from one extreme (maximum or minimum) to another (minimum or maximum) and back, it is called a/an _____C______. What are A, B and C respectively? bob, pendulum, speed bob, pendulum, oscillation string, pendulum, time period string, oscillation, vibration None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
