Ncert- science – class 7- Chapter 9 – Motion and Time 1 Welcome to your Ncert- science – class 7- Chapter 9 – Motion and Time 1 1. 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? 5.65 s 5.05 s 165 s 5.35 s None 2. Which one of the following devices records the speed directly in km/h? Thermometer Odometer Hygrometer Speedometer None 3. Which of the following is/are present in a quartz clock? a. Electric circuit b. Micro-pendulum c. Sundials d. Cells a and b a and d a and c Only a None 4. 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, oscillatory, equal, time period string, bob, periodic, equal, speed string, bob, non-uniform, equal, time period bob, string, oscillatory, equal, time period None 5. 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? 2 ms-1, 0 ms-1 None of these 0 ms–1, 0 ms–1 0 ms-1, 2 ms–1 None 6. 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? 50 minutes 35 minutes 40 minutes 45 minutes None 7. Sometimes it is required to measure time interval in smaller units. Which of the following equals one billionth of a second? Millisecond Microsecond Picosecond Nanosecond None 8. 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 9. The distance between two stations is 300 km. A train takes 5 hours to cover this distance. What is the speed of the train? 70 km/hr 40 km/hr 60 km/hr 50 km/hr None 10. Which of the following sentences is false regarding uniform motion? Speed is constant. It is exhibited by objects moving along a straight line. Average speed is equal to actual speed. Periodic motion is uniform. None 11. 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, 0.21 km/min 45 km, 0.64 km/min 145 km, 23.7 km/min 45 km, 38.57 km/min None 12. 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, oscillation string, oscillation, vibration bob, pendulum, speed string, pendulum, time period None 13. Which of the following options is true for the descending order of units of distance? (a) Metre (b) Centimetre (c) Kilometre (a) > (c) > (b) (c) > (a) > (b) (b) > (a) > (c) (a) > (b) > (c) None 14. 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. 100 km/hr 20 km/hr 75 km/hr 40 km/hr None 15. 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? uniform moving, non-uniform moving fast moving, slow moving non-uniform moving, uniform moving slow moving, fast moving None 16. Which of the following are the instruments used to measure speed and distance respectively? Speedometer, Anemometer Odometer, Anemometer Odometer, Speedometer Speedometer, Odometer None 17. A simple pendulum takes 40 s to complete 20 oscillations. What is its time period? 4s 5s 3s 2s None 18. 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 Distance Time Distance (km) 9:00 am 0 9:10 am 2 9:20 am 4 9:30 am 6 S-shape Curved line Straight line Bell shape None 19. The value 126 km/hr is the same as 35 m/s 20 m/s 30 m/s 25 m/s None 20. Which of the following is an example of uniform motion? A horse running in a race Walking on a busy street A bus on its way through the busy market A train going along the tracks at steady speed 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 comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
