CBSE Class 9 Science Describing Motion Around Us (Class 9 NCERT New) Quiz 7

1. During which interval is the object traveling at a constant velocity?

A B to C B D to E C F to G D it traveling at a constant velocity during all of the intervals shown.

2. Acceleration is

A increasing speed B decreasing speed C changing direction D all of the above

3. This is a velocity-time graph. What is the object doing in segment C?

A Positive acceleration B Negative acceleration C Constant Velocity D Not moving

4. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

A (a) + 2 m/s2 B (b) − 2 m/s2 C (c) − 0.5 m/s2 D (d) + 0.5 m/s2

5. In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal?i. If the car is moving on a straight roadii. If the car is moving in circular pathiii. The pendulum is moving to and froiv. The earth is moving around the sun

A (a) only(ii) B (b) (i) and (iii) C (c) (ii) and (iv) D (d) only (i)

6. The slope of speed - time graph gives

A speed B velocity C momentum D acceleration

7. Question 1. A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is

A (a) zero km B (b) 10 km C (c) 30 km D (d) 50 km

8. Question 17.Four cars A, B, C and D are moving on a levelled, straight road. Their distance time graphs are shown in the figure below. Which of the following is the correct statement regarding the motion of these cars?

A Car A is faster than car D B Car B is the slowest C Car D is faster than car C D Car C is the slowest

9. Which of the following do you think travel in uniform velocity?

A A car in a circular track B The Earth around the Sun C A man running in a straight line D A car travelling at uniform speed in a traffic road

10. If a puppy runs for 50 meters in 10 seconds , what was the puppies speed in kilometer per hour?

A 5 m/s B 18m/hr C 18 km/s D 18 km/hr