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Science
9th
grade
Speed With Direction | Motion | Assessment | English | Grade 9
7 questions
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- 1. Multiple Choice
Velocity can change due to change in ___.
Speed
Direction
Both speed and direction
All of the above
- 2. Multiple Choice
A and B decided to row a boat which was at rest in the river bank. First A took the charge and rowed the boat with a velocity of 10 m/s for 40 seconds. Then B decided to him and together they rowed the boat at 20 m/s for 30 seconds. When do you think the acceleration was more?
When A was rowing alone.
When A and B were rowing together.
The acceleration was same in both the cases.
The boat was moving with uniform velocity.
- 3. Multiple Choice
Meera swimmed from one end of a swimming pool to another and then returned back. The pool is 200 meter long and time taken by Meera is 5 minutes. Calculate average speed and average velocity of Meera.
Average speed = 0.66 m/s Average velocity= 1.33 m/s
Average speed = 1.33m/s Average velocity = 0 m/s
Average speed = 0.66m/s Average velocity = 0 m/s
Average speed = 0 m/s Average velocity = 1.33 m/s
- 4. Multiple Choice
Calculate acceleration if a car covers a distance of 200 m with an uniform velocity of 40 m/s in 5 seconds.
6.66 m/s²
20 m/s²
1 m/s²
None of the above
- 5. Multiple Choice
Which physical quantity is measured in distance/second²?
Velocity
Uniform velocity
Acceleration
Speed
- 6. Multiple Choice
A is driving a car at the speed of 10m/s. After 4 seconds the car comes to rest as brakes are applied. What will be the acceleration and retardation of the vehicle?
Acceleration = 2.5 m/s² Retardation = −2.5 m/s²
Acceleration = −2.5 m/s² Retardation = 2.5 m/s²
Acceleration = 20 m/s² Retardation = −20 m/s²
Acceleration = −20 m/s² Retardation = 20 m/s²
- 7. Multiple Choice
Which of the following statement is false?
Negative acceleration is termed as retardation.
Speed and velocity have different units.
Uniform acceleration involves increase of equal velocity in equal time interval.
Acceleration is change in velocity per unit time.
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