This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 8 Motion – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 8 Motion Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home. What is Bill's distance? A) 0 meters. B) 400 meters. C) 800 meters. D) 1600 meters. Show Answer Correct Answer: C) 800 meters. 2. When a body moves uniformly along the circle, then: A) It's velocity changes but speed remains the same. B) It's speed changes but velocity remains the same. C) Both speed and velocity remains the same. D) Both speed an velocity changes. Show Answer Correct Answer: A) It's velocity changes but speed remains the same. 3. If a runner covers a distance of 347 meters in 134 seconds, what is her speed? A) 2.59 m/s. B) 46, 498 m/s. C) 0.39 m/s. D) 6.78 m/s. Show Answer Correct Answer: A) 2.59 m/s. 4. A person travels a distance of 4.0 m towards the east, then turns left and travels 3.0 m towards the north.1. What is the total distance traveled by the person toward north?2. What is his displacement? A) Total distance 7m and Total displacement 5m. B) Total distance 5m and Total displacement 7m. C) Total distance 4m and Total displacement 8m. D) Total distance 3m and Total displacement 9m. Show Answer Correct Answer: A) Total distance 7m and Total displacement 5m. 5. The energy of food is measured in ..... A) Kelvin. B) Calories. C) Celsius. D) None of the above. Show Answer Correct Answer: B) Calories. 6. Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is: A) At rest. B) Moving with no acceleration. C) In accelerated motion. D) Moving with uniform velocity. Show Answer Correct Answer: C) In accelerated motion. 7. A firefighter drops from a window into a net. If the window is 34 meters above the net, the speed with which firefighter hit the net A) 18 m/s. B) 20 m/s. C) 12 m/s. D) 26 m/s. Show Answer Correct Answer: D) 26 m/s. 8. What is the starting point used to describe the motion or position of an object? A) Starting line. B) Displacement. C) Reference point. D) Velocity. Show Answer Correct Answer: C) Reference point. 9. What distance will a car traveling 65 km/hr travel in 180 min? A) 11, 700 m. B) 195 m. C) 21.7 m. D) 2.77 m. Show Answer Correct Answer: B) 195 m. 10. The distance an object moves is A) Velocity. B) Speed. C) Displacement. D) Acceleration. Show Answer Correct Answer: B) Speed. 11. A change in speed over a given period of time is A) Velocity. B) Motion. C) Speed. D) Acceleration. Show Answer Correct Answer: D) Acceleration. 12. What is the formula to solve for the speed of an object? A) S=d/t. B) S=d x t. C) S=t/d. D) None of the above. Show Answer Correct Answer: A) S=d/t. 13. Which of the following can sometimes be 'zero' for a moving body? A) Average velocity. B) Distance travelled. C) Average speed. D) Displacement. Show Answer Correct Answer: A) Average velocity. 14. Acceleration is a vector quantity, which indicates that its value A) Is always negative. B) Is always positive. C) Is zero. D) Can be positive, negative or zero. Show Answer Correct Answer: D) Can be positive, negative or zero. 15. A train moving with velocity of 54 km/hr is accelerated so that its velocity becomes 72 km/hr in 15 s. Find the acceleration of the train? A) 0.33m/s$^{-2}$. B) 0.45m/s$^{-2}$. C) All the above. D) None of the above. Show Answer Correct Answer: A) 0.33m/s$^{-2}$. 16. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, the retardation will be A) +2 m s $^{-2 }$. B) -2 m s$^{-2}$. C) -0.5 ms$^{-2}$. D) + 0.5 m s$^{-2 }$. Show Answer Correct Answer: D) + 0.5 m s$^{-2 }$. 17. Which information is needed to determine how fast a truck is traveling? A) Direction and mass. B) Distance and time. C) Size and speed. D) Time and weight. Show Answer Correct Answer: B) Distance and time. 18. A moving train is brought to rest within 20 seconds by applying brakes. If the retardation due to brakes is 2 m/s$^{2}$, then the initial velocity was, A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. Show Answer Correct Answer: D) 40 m/s. 19. The average velocity of a body is given by the expression is A) In = (y + c)/2. B) V= u+ at. C) 2as = v2-u2. D) None of the above. Show Answer Correct Answer: A) In = (y + c)/2. 20. Which of these is your favorite? A) Stars. B) Planets. C) Comets. D) None of the above. Show Answer Correct Answer: A) Stars. 21. What is SI unit of speed? A) M/s. B) M/s$^{2}$. C) M/s$^{3}$. D) M/h. Show Answer Correct Answer: A) M/s. 22. Displacement A) Motion of object in circular path with uniform speed. B) Body in uniform motion. C) Rate of change of velocity with respect to time. D) Shortest distance between initial and final position. Show Answer Correct Answer: D) Shortest distance between initial and final position. 23. What is the equation to calculate speed? A) Speed = distance/time. B) Speed = time/distance. C) Speed = time x distance. D) Speed = speed/time. Show Answer Correct Answer: A) Speed = distance/time. 24. Position time graph for zero acceleration- A) Straight line parallel to time axis. B) Straight line passing through origin. C) Curved line. D) Zig zag line. Show Answer Correct Answer: B) Straight line passing through origin. 25. What is magnitude? A) The direction that describes a quantity. B) A numerical value. C) A unit of force. D) None of the above. 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