Worksheetsquiz
Total questions: 10
Worksheet time: 3mins
Which of the following statements is wrong
Sound travels in a straight line
Sound travels as waves
Sound is a from of energy
Sound travels faster in vacuum that then in air
With the propagation of a longitudinal wave through a material medium the quantities transmitted in the propagation direction are
Energy, momentum and mass
Energy
Energy and mass
Energy and linear momentum
When a source is going away from a stationary observer, with a velocity equal to that of sound in air, then the frequency heard by the observer will be
Same
Half
Double
One third
What is the need to achieve population inversion?
A To excite most of the atoms
To excite most of the atoms
To bring most of the atoms to ground state
To achieve stable condition
To reduce the time of production of laser
Which process gives the laser its special properties as an optical source?
Dispersion
Stimulated absorption
Spontaneous emission
Stimulated emission
A ray of light will undergo total internal reflection if it
Goes from rarer medium to denser medium Incident at an angle
less than the critical angle
Strikes the interface normally
Incident at an angle greater than the critical angle
What is the principle of fibre optical communication?
Frequency modulation
Population inversion
Total internal reflection
Doppler effect
What is the other name for a maximum external incident angle?
Optical angle
Total internal reflection angle
Refraction angle
Wave guide acceptance angle
Which among the following is described by the concept of numerical aperture in an optical fibre?
Light collection
Light scattering
Light dispersion
Light polarisation
The coefficient of volume expansion of solids is
greater than liquids
equal to gases
less than liquids
equal to liquids
