MCQ - CBSE Class 9 Science Explain how defects in a metal block can be detected using ultrasound. 10/03/2023 Ajit kumar 91 Views 0 Comments Read more
MCQ - CBSE Class 9 Science How is ultrasound used for cleaning ? 10/03/2023 Ajit kumar 79 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain how bats use ultrasound to catch their prey. 10/03/2023 Ajit kumar 102 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is loudness of sound? What factors does it depend on? 10/03/2023 Ajit kumar 140 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What is reverberation? How can it be reduced ? 10/03/2023 Ajit kumar 98 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Give two practical applications of reflection of sound waves. 10/03/2023 Ajit kumar 76 Views 0 Comments Read more
MCQ - CBSE Class 9 Science When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day? 10/03/2023 Ajit kumar 85 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Does sound follow the same laws of reflection as light does? Explain. 10/03/2023 Ajit kumar 73 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a darkroom? 10/03/2023 Ajit kumar 64 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why is sound wave called a longitudinal wave ? 10/03/2023 Ajit kumar 80 Views 0 Comments Read more