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Physics Mcqs — Test 21

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Question 1
Diffraction fringes are____________________?
Question 2
A thing that emits its own light is___________________?
Question 3
Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
Question 4
Which experiment shows that wavelength of light is smaller than that of sound___________________?
Question 5
When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
Question 6
If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
Question 7
The average power and instantaneous power become equal if work is done at __________________?
Question 8
Two sources of light are coherent if they emit rays of_______________?
Question 9
The velocity of light was determined accurately by_______________?
Question 10
appearance of colour in thin films is due to ____________________?