MCQ on Sound Class 9. We covered all the MCQ on Sound Class 9 in this post for free so that you can practice well for the exam.
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Objective MCQ on Sound Class 9 for Students
A biotechnique in which ultrasonic sound is used
(A) Sonography
(B) E.C.G.
(C) E.E.G.
(D) X-ray
Option a – Sonography
Bats can fly during dark nights and also prey. This is because
(A) The pupil of their eyes is large
(B) Their night vision is very good
(C) Every bird can do this
(D) They produce ultrasonic waves and are guided by them
Option d – They produce ultrasonic waves and are guided by them
Which one of the following is the effect of the flight of a supersonic jet?
(A) Air pollution
(B) Eye disease
(C) Depletion in the ozone layer
(D) None of the above
Option c – Depletion in the ozone layer
Decibel is used to measure
(A) Haemoglobin in the blood
(B) Sugar in urine
(C) Sound in the atmosphere
(D) Particles in the air
Option c – Sound in the atmosphere
A Decibel unit is used to measure
(A) Light intensity
(B) Sound intensity
(C) Magnitude of the earthquake
(D) None of the above
Option b – Sound intensity
What is the decibel level of sound produced by two persons in conversation?
(A) About 5 decibel
(B) About 10 decibel
(C) About 30 decibel
(D) About 100 decibel
Option c – About 30 decibel
A noise level of 100 decibels would correspond to
(A) Just audible sound
(B) Ordinary conversation
(C) Sound from a noisy street
(D) Noise from a machine shop
Option d – Noise from a machine shop
As per the WHO, the safe noise level for a city is
(A) 45 dB
(B) 50 dB
(C) 55 dB
(D) 60 dB
Option a – 45 dB
What is the purpose of the ‘Evolved Laser Interferometer Space Antenna (ELISA)’ project?
(A) To detect neutrinos
(B) To detect gravitational waves
(C) To detect the effectiveness of missile defense systems
(D) To study the effect of solar flares on our communication systems
Option b – To detect gravitational waves
Ultrasonics are sound waves of frequency
(A) Greater than 20,000 Hz
(B) Less than 10,000 Hz
(C) Equal to 1000 Hz
(D) None of the above
Option a – Greater than 20,000 Hz
We covered all the mcq on sound class 9 above in this post for free so that you can practice well for the exam.
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