MCQ - CBSE Class 9 Science Bats have no eyes still they can ascertain distances, directions, nature and size of the objects. Explain why. 10/04/2023 Ajit kumar 67 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain why there is usually a time delay between observing a flash and hearing a thunder ? 10/04/2023 Ajit kumar 57 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Two astronauts cannot hear each other on the moon. Why? 10/04/2023 Ajit kumar 87 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why can we hear echoes in long galleries and big halls? 10/04/2023 Ajit kumar 89 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain why echoes can’t be heard in a small room. 10/04/2023 Ajit kumar 96 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Name the waves of frequency greater than 20,000 Hz. Give one use of these waves. 10/04/2023 Ajit kumar 69 Views 0 Comments Read more
MCQ - CBSE Class 9 Science What do you understand by the term ultrasonic vibrations ? 10/03/2023 Ajit kumar 87 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Define the terms: (i) vibration (ii) time period (iii) frequency and (iv) amplitude. 10/03/2023 Ajit kumar 75 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Very Short Answer Type Questions 10/03/2023 Ajit kumar 89 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain how the human ear works. 10/03/2023 Ajit kumar 87 Views 0 Comments Read more