MEDIUM
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Which type of waves are used by a 'RADAR' for detecting the presence of an aircraft?

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Important Questions on Physics

EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
A pendulum vibrates with a time period of 1 second. The sound produced in it is in the range of
MEDIUM
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Assume that the displacement s of air is proportional to the pressure difference Δp created by a sound wave. Displacement (s) further depends on the speed of sound (v), density of airρ and the frequency (f). If Δp=10 Pa, n=300 m s-1, p=1 kg m-3 and  f=1000 Hz, then s will be of the order of (take the multiplicative constant to be 1)
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm, from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in air is 330 m s-1, the tuning fork frequency is :
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
The vibration of which among the following produces only odd harmonics?
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
The speed of sound in seawater is _____:
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
What is the velocity of sound in air?
MEDIUM
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
The driver of bus approaching a big wall notices that the frequency of his bus's horn changes from 420 Hz to 490 Hz when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is 330 ms–1:
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Which of the following is not a characteristic of sound wave?
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Which of the following wave types is an example of the waves produced by a moving motorboat on water's surface?
MEDIUM
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Which of the following animals can produce ultrasound?

 

EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Which of the following creatures use ultrasonic sound to catch their prey?
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Waves produced at the bottom of the sea due to an explosion are _____:
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Sound cannot travel through _____.
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
A bomb blasts on moon. Its sound will be heard on earth after
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
In SONAR, we use
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
To propagate both longitudinal and transverse waves, a material must have
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
Bats search out prey and fly in dark nights by emitting and detecting reflections of which type of Sound Waves?
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
In which of the following medium does sound travel the fastest?
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound
The speed of sound is maximum in _____:
EASY
Reasoning and General Awareness>General Knowledge and Current Affairs>Physics>Sound

What is the noise level of normal conversation?

1. About 60 dB
2. About 70 dB
3. About 80 dB
4. About 90 dB