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
The pitch of sound depends on:
Frequency
Amplitude
Both of these
None of these
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:
Sound will be louder but pitch will not be different
Sound will be louder and the ptich will also be higher
Sound will be louder but pitch will be lower
Both loudness and pitch will remain unaffected
Choose the correct answer. Sound can travel through:
Gases only
Solids only
Liquids only
Solids, liquids and gases
Sound is a kind of
Work
Energy
Force
None
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
Which of the following modes is utilised in the production of sound by humans?
vibrating membranes
vibrating plates
vibrating strings
vibrating air columns
Sound propagates maximum in
Gas
Liquid
Solid
All
Voice of which of following is likely to have minimum frequency?
Baby girl
Baby boy
A man
A woman
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
