Which of the following are used to study the growth of foetus inside the mother's womb?
Radio waves
X-rays
Infrared waves
Sound waves
Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?
5 kHz
25 Hz
10 Hz
15,000 Hz
Eardrum is a part of:
Sound producing organ
Skeletal system
Hearing organ
Reproductive organ
To an fro motion of an object is called
Waves
Amplitude
Vibration
All of the above
Which of the following modes is utilised in the production of sound by humans?
vibrating membranes
vibrating plates
vibrating strings
vibrating air columns
Large amplitude of sound vibrations will produce:
Loud sound
Meak sound
Slow sound
Shreak
The velocities of sound waves in four media P, Q, R and S are 18,000 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance?
P
Q
R
S
Sound propagates maximum in
Gas
Liquid
Solid
All
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:
water
wax
vacuum
empty vessel
The ultrasound waves can penetrate into matter to a large extent because they have:
very high speed
very high frequency
very high quality
very high amplitude