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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
Which Biotechnology makes use of ultrasonic waves?
(A) Sonography
(B) ECG
(C) EEG
(D) X-ray
Option a – Sonography
Bats are able to fly and hunt even on very dark nights mainly because
(A) They have very large pupils
(B) Their eyesight is extremely sharp at night
(C) All birds possess this ability
(D) They emit ultrasonic waves and navigate using the echoes
Option d – They emit ultrasonic waves and navigate using the echoes
One of the effects associated with the flight of supersonic jets is
(A) Air Pollution
(B) Eye-related diseases
(C) Reduction of the ozone layer
(D) None of these
Option c – Reduction of the ozone layer
The decibel scale is used to measure
(A) Hemoglobin level in blood
(B) Sugar content in urine
(C) sound in the Atmosphere
(D) Airborne particles
Option c – sound in the Atmosphere
A decibel is a unit for measuring
(A) Intensity of Light
(B) Intensity of sound
(C) Earthquake magnitude
(D) None of these
Option b – Intensity of sound
The approximate sound level produced by two people having a normal conversation is
(A) Around 5 decibels
(B) Around 10 decibels
(C) Around 30 decibels
(D) Around 100 decibels
Option c – Around 30 decibels
A noise level of about 100 decibels is similar to
(A) Barely audible sound
(B) Normal conversation
(C) sound on a busy street
(D) Noise in a machine workshop
Option d – Noise in a machine workshop
According to the World Health Organization, the safe noise limit for urban areas is
(A) 45 dB
(B) 50 dB
(C) 55 dB
(D) 60 dB
Option a – 45 dB
The main objective of the Evolved Laser Interferometer Space Antenna project is
(A) Detection of neutrinos
(B) Detection of gravitational waves
(C) Testing missile defense systems
(D) Studying the impact of Solar flares on Communication systems
Option b – Detection of gravitational waves
Ultrasonic waves are sound waves with frequencies
(A) Above 20,000 Hz
(B) Below 10,000 Hz
(C) Exactly 1,000 Hz
(D) None of these
Option a – Above 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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