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Which of the following cannot travel in vacuum?
ক
Radio waves
খ
Gamma Waves
গ
Infrared Waves
ঘ
Infrasonic waves
Which of the following is not a characteristic of sound?
ক
Intensity
খ
Frequency
গ
Speed
ঘ
Quality
Which of the following is not a transverse wave?
ক
Light waves
খ
Radio waves
গ
Sound waves
ঘ
All the above
What is the minimum distance (in metres) required to hear an echo?
ক
10
খ
13
গ
17
ঘ
21
Which one of the following is not a property of electromagnetic waves?
ক
Electromagnetic waves do not show interference and diffraction.
খ
Oscillating electric field and magnetic field are perpendicular to each other.
গ
Electromagnetic waves are transverse waves
ঘ
Electromagnetic waves do not require a medium to propagate.
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
ক
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
খ
Both\ \ the\ \ photons\ \ have\ \ different energies.
গ
The\ speeds\ of\ both\ the\ photons\ in vacuum are different
ঘ
The\ \frequency\ \of\ \X-ray\ \photon\ \is higher\ than\ the\ frequency\ of\ visible radiation photon.
Which among the following determines the pitch of a sound?
ক
Amplitude
খ
Frequency
গ
Loudness
ঘ
Wavelength
What is the range of frequencies of sound waves audible to human beings?
ক
16kHz to 200kHz
খ
16Hz to 16kHz
গ
16Hz to 20kHz
ঘ
14Hz to 20kHz
A periscope works on the principle of
ক
Refraction
খ
Total internal reflection
গ
Diffraction
ঘ
Reflection
The blue colour of water in the sea is due to
ক
Absorption of other colours except blue by water molecules
খ
Scattering of blue light by water molecules
গ
Reflection of blue light by impurities in sea water
ঘ
Reflection of blue sky by sea water
Loudness of sound depends upon which of the following?
ক
Frequency
খ
Wavelength
গ
Amplitude
ঘ
Overtones
Sound waves do not show the phenomenon of
ক
Refraction
খ
Interference
গ
Diffraction
ঘ
Polarisation
Velocity of sound in air does not depend on
ক
Density of air
খ
Temperature of air
গ
Pressure of air
ঘ
Humidity of air
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
ক
Reflection of light
খ
Refraction of light
গ
Dispersion of light
ঘ
Scattering of light
Which of the following has the highest frequency?
ক
Cosmic rays
খ
X-rays
গ
Radio waves
ঘ
Microwaves
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