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

What does SONAR stand for?

Does SONAR make use of infrasonic sound?

What are ultrasonic? State and explain two applications of ultrasounds.

What are infrasonic and ultrasonic sounds?

Is the energy carried by the ultrasound very high or very low?

What is echocardiography?

What does SONAR stand for? Where do we make use of SONAR?

What are hearing aids?

State the main components of a hearing aid.

Describe a simple method to find the depth of a submerged ship.

State the properties of ultrasound that make it useful.

In vacuum, all freely falling objects have the same force. Is it true?

State whether the below statement is True or False.
Neglecting air resistance, a body falling freely near the earth's surface has a constant acceleration.

Explain why:
Objects fall to the earth.

What do you understand by the free fall?

Represent the location of an object described as at 15 m, 45^o west of north, on a graph paper.

Represent the position of a body described as at 15 m, 30^o north of west, on a graph paper.

The area under a speed-time graph in a given intervals gives the total distance covered by a body irrespective of its motion being uniform or non-uniform.

The area of the right triangle under a speed-time graph is 500 m, in a time interval of 20 s. What is the speed of the body? Is the motion uniform or non-uniform?

Name the physical quantity which is equal to the area under speed-time graph.