MCQ - CBSE Class 9 Science A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for particular length of air column: 10/04/2023 Ajit kumar 102 Views 0 Comments Read more
MCQ - CBSE Class 9 Science The rear view mirror of motor bike starts vibrating violently at some particular speed of motor bike. 10/04/2023 Ajit kumar 69 Views 0 Comments Read more
MCQ - CBSE Class 9 Science How does the sound produced by a musical instrument, ears? Astronauts need radio transmitter to your talk to each other on moon. Why ? 10/04/2023 Ajit kumar 79 Views 0 Comments Read more
MCQ - CBSE Class 9 Science The sound of which of the following frequencies are audible to liuman ears: 2 Hz, 5 Hz, 20 Hz, 200 Hz, 2000 Hz. 10/04/2023 Ajit kumar 74 Views 0 Comments Read more
MCQ - CBSE Class 9 Science “A sound wave with frequency higher than 20 kHz is not audible for human ear”. Answer the following in respect of this statement : 10/04/2023 Ajit kumar 80 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is the cause of sensation of sound due to rolling of thunder? 10/04/2023 Ajit kumar 86 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is an echo? When can we distinctly hear the echo of a sharp sound? Why cannot we hear an echo in a small halls ? 10/04/2023 Ajit kumar 102 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is audible range of the average human ear? 10/04/2023 Ajit kumar 82 Views 0 Comments Read more
MCQ - CBSE Class 9 Science A boy strikes one end of a long pipe with a stone. Another boy who keeps his ear close to the other end of pipe heard two sounds in a short interval of time. Explain, why. 10/04/2023 Ajit kumar 82 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Define frequency, amplitude and speed of a sound wave. 10/04/2023 Ajit kumar 79 Views 0 Comments Read more