201.
An echo occurs when a sound wave is
A
absorbed
B
transmitted
C
refracted
D
reflected
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An echo occurs when a sound wave is
absorbed
transmitted
refracted
reflected
The wavelength of a wave is measured in
metres
hertz
seconds
decibels
A sound wave is produced when an object
accelerates
decelerates
vibrates
remains stationary
Which of the following quantities is transferred during wave propagation?
speed
mass
energy
matter
_______________ is an example for mechanical wave.
radio wave
light wave
sound wave
infrared wave
Which of the following will remain unchanged when a sound wave travels in air or in water?
frequency
wavelength
amplitude
speed
The speed of sound in medium depends upon
frequency
amplitude
wavelength
properties of the medium
The amplitude of a wave is ______.
the distance the wave moves in one second
the maximum distance moved by the medium particles on either side of the mean position
the distance the wave moves in one time period of the wave
the distance equal to one wave length
Sound waves are _________________ in nature
longitudinal
transverse
partly longitudinal and partly transverse
sometimes longitudinal and sometimes transverse
Sound waves do not travel through
vacuum
soild
liquid
gases
When sound travels through air, the air particles ______.
do not vibrate
vibrate but not in any fixed direction
vibrate perpendicular to the direction of wave propagation
vibrate along the direction of wave propagation
The minimum distance between the source and the reflector, so that an echo is heard is approximately
12 m
15 m
17 m
21 m
Bats detect the obstacles in their path by receiving the reflected ______.
radio waves
ultrasonic waves
electromagnetic waves
infrasonic waves
When a wave travels through a medium ______.
energy is transferred at a constant speed
energy is transferred in a periodic manner
particles are transferred from one place to another
none of these
Who discovered that the Earth revolves around the Sun?
Galileo Galilei
Isaac Newton
Albert Einstein
Johannes Kepler
Which planet is called the red planet in our solar system?
Mercury
Mars
Jupiter
Neptune
Which planet appears to be yellowish?
Asteroids
Mars
Uranus
Saturn
Which of the following planets of the solar system has the longest day?
Mercury
Jupiter
Venus
Earth
Which of the following is correct with respect to Great Bear?
Planet
Galaxy
Star
Constellation
Which is the nearest planet to the sun?
Neptune
Mars
Mercury
Earth