Diffraction fringes are____________________?

A. Equally spaced
B. Distance between them increases
C. Distance between then decreases
D. They are adjacent with no space in between

A thing that emits its own light is___________________?

A. Luminous
B. Non-luminous
C. Incandescent
D. Bright

Gives the definition of metre in terms of wavelength of red cadmium light ___________________?

A. Newton
B. Einstein
C. Michelson
D. Galileo

Which experiment shows that wavelength of light is smaller than that of sound___________________?

A. Diffraction
B. Polarization
C. Interference
D. Reflection

When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?

A. Zero
B. Minimum
C. Infinity
D. Maximum

If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?

A. 38.2 j
B. 392.1 j
C. 39.2 j
D. 3.92 j

The average power and instantaneous power become equal if work is done at __________________?

A. Any rate
B. At variable rate
C. At uniform rate
D. At high rate

Two sources of light are coherent if they emit rays of_______________?

A. Same wavelength
B. Same amplitude of vibration
C. Same wave length with constant phase difference
D. Same amplitude and wavelength

The velocity of light was determined accurately by_______________?

A. Newton
B. Michelson
C. Huygen
D. Young

appearance of colour in thin films is due to ____________________?

A. Diffraction
B. Dispersion
C. Interference
D. Polarization