(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

What is Galton’s whistle? To what use is it put?

State four practical uses of ultrasonic vibrations.

The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.

An electromagnetic wave has a time period of 4 × 10^-8 s. Calculate its frequency in MHz.

Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 10⁸ ms^-1. Calculate:

1. frequency
2. time period.

Multiple choice Question. Select the correct option.

A graph is a straight line parallel to the time axis in a distance-time graph. From the graph, it implies:

Multiple choice Question. Select the correct option.

The slope of displacement – time graph represents.

What does the area of an acceleration – time graph represent?

Multiple choice Question. Select the correct option.

In the velocity-time graph, the acceleration is

Multiple choice Question. Select the correct option.

The distance covered in the adjoining velocity-time graph is :

Draw displacement – time graph for the following situation:

When a body is stationary.

Draw velocity – time graph for the following situation:

When a body, is moving with uniform velocity.

Draw velocity – time graph for the following situation:

When a body is moving with variable velocity, but uniform acceleration.

Diagram shows a velocity – time graph for a car starting from rest. The graph has three sections AB, BC and CD.

From a study of this graph, state how the distance travelled in any section is determined.

Diagram shows a velocity – time graph for a car starting from rest. The graph has three sections AB, BC and CD.

Compare the distance travelled in section BC with the distance travelled in section AB.

Diagram shows a velocity – time graph for a car starting from rest. The graph has three sections AB, BC, and CD.

In which section, car has a zero acceleration?

Diagram shows a velocity – time graph for a car starting from rest. The graph has three sections AB, BC, and CD.

Is the magnitude of acceleration higher or lower than that of retardation? Give a reason.

A train starting from rest picks up a speed of 20 ms⁻¹ in 200 s. It continues to move at the same rate for the next 500 s and is then brought to rest in another 100 s.

1. Plot a speed-time graph.
2. From graph calculate
   (a) uniform rate of acceleration
   (b) uniform rate of retardation
   (c) total distance covered before stopping
   (d) average speed.

A ball is thrown up vertically and returns back to thrower in 6 s. Assuming there is no air friction, plot a graph between velocity and time. From the graph calculate

1. deceleration
2. acceleration
3. total distance covered by ball
4. average velocity.

A body at rest is thrown downward from the top of the tower. Draw a distance – time graph of its free fall under gravity during the first 3 seconds. Show your table of values starting t = 0 with an interval of 1 second, (g = 10 ms⁻²).