Class 9 - Quiz Level 3 (Difficult) – Motion

Total questions: 10

A wheel rotates with a uniform angular acceleration of 2 rad/s². If the initial angular velocity is 3 rad/s, what is the angular velocity after 5 seconds?

Topic: Rotational Motion

Deselect Answer

5 rad/s

10 rad/s

13 rad/s

15 rad/s

None

A projectile is fired with an initial velocity of 100 m/s at an angle of 45° with the horizontal. Calculate the time of flight of the projectile. $ \displaystyle \text{(Take g = 9}\text{.8 m/}{{\text{s}}^{2}})$

Topic: Projectile Motion

Deselect Answer

14.3 s

10.2 s

20.4 s

7.1 s

None

A particle starts from rest and moves with a varying acceleration given by a = 3t m/s². What is the velocity after 4 seconds?

Topic: Motion with Varying Acceleration

Deselect Answer

8 m/s

16 m/s

24 m/s

32 m/s

None

A car moves in a circular track of radius 100 m with a constant speed of 20 m/s. What is the centripetal acceleration of the car?

Topic: Circular Motion

Deselect Answer

$ \displaystyle 2m/{{s}^{2}}$

$ \displaystyle 4m/{{s}^{2}}$

$ \displaystyle 6m/{{s}^{2}}$

$ \displaystyle 8m/{{s}^{2}}$

None

A swimmer can swim in still water at a speed of 5 m/s. He swims across a river flowing at 3 m/s. What is the resultant velocity of the swimmer relative to the riverbank?

Topic: Relative Motion in a River

Deselect Answer

4 m/s

5 m/s

6 m/s

8 m/s

None

A bullet of mass 0.01 kg is fired from a gun of mass 1 kg with a velocity of 100 m/s. Calculate the recoil velocity of the gun.

Topic: Conservation of Momentum

Deselect Answer

-1 m/s

-0.1 m/s

-0.5 m/s

-0.01 m/s

None

A stone is thrown vertically upward with a velocity of 40 m/s. Calculate the time taken to reach the highest point and the maximum height reached. $ \displaystyle \left( {\text{Take }g\text{ }=\text{ }9.8\text{ }m/s{}^\text{2}} \right)$

Topic: Vertical Motion

Deselect Answer

$ \displaystyle {4.08\text{ }s,\text{ }81.63\text{ }m}$

$ \displaystyle {5.10\text{ }s,\text{ }102.04\text{ }m}$

$ \displaystyle {3.50\text{ }s,\text{ }71.43\text{ }m}$

$\displaystyle {4.82\text{ }s,\text{ }98.32\text{ }m}$

None

A car moving with a velocity of 30 m/s comes to rest in 5 seconds. Calculate the acceleration and the distance traveled by the car.

Topic: Kinematic Equations

Deselect Answer

-6 m/s², 75 m

-5 m/s², 90 m

-4 m/s², 60 m

-3 m/s², 45 m

None

A wheel rotating at 10 rad/s is subjected to a uniform angular deceleration of 2 rad/s². How long will it take to come to rest?

Topic: Rotational Motion

Deselect Answer

2 s

4 s

5 s

10 s

None

10.

A projectile is launched with an initial velocity of 50 m/s at an angle of 30° to the horizontal. Calculate the horizontal range of the projectile.$ \displaystyle \left( {\text{Take }g\text{ }=\text{ }9.8\text{ }m/s{}^\text{2}} \right)$

Topic: Projectile Motion

Deselect Answer

127.55 m

254.9 m

220.83 m

102.5 m

None

1 out of 10

Class 9 - Quiz Level 3 (Difficult) – Motion

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