Quiz for Diffraction

Q1: What is diffraction of light?

A. Reflection of light from a surface B. Bending of light around obstacles C. Splitting of light into colors D. Absorption of light by medium

Q2: Which phenomenon cannot be explained by ray optics?

A. Reflection B. Refraction C. Diffraction D. Image formation by mirrors

Q3: Diffraction is more pronounced when the size of the obstacle is:

A. Much larger than wavelength B. Comparable to the wavelength C. Much smaller than the wavelength D. Irrelevant to wavelength

Q4: In single slit diffraction, the width of central maximum is:

A. Directly proportional to slit width B. Inversely proportional to slit width C. Independent of slit width D. Proportional to wavelength squared

Q5: Which type of wave does not show diffraction?

A. Light wave B. Sound wave C. Water wave D. None of these

Q6: Which instrument uses diffraction for wavelength measurement?

A. Voltmeter B. Ammeter C. Spectrometer D. Galvanometer

Q7: The angle of diffraction increases with:

A. Increasing slit width B. Decreasing slit width C. Decreasing wavelength D. None of these

Q8: Diffraction in sound is easier to observe than in light because:

A. Sound has higher speed B. Sound has longer wavelength C. Sound is mechanical wave D. Sound does not diffract

Q9: In diffraction pattern, intensity of secondary maxima is:

A. Equal to central maximum B. Greater than central maximum C. Less than central maximum D. Zero

Q10: Which of the following is not a condition for diffraction?

A. Coherent source B. Narrow slit C. Obstacle comparable to wavelength D. Medium with constant refractive index

Q11: Which color of light diffracts more?

A. Red B. Blue C. Green D. All diffract equally

Q12: Which of the following does not affect diffraction?

A. Wavelength of light B. Width of slit C. Color of light D. Mass of photons

Q13: Which device is based on diffraction?

A. Microscope B. Diffraction grating C. Telescope D. Periscope

Q14: What is observed when monochromatic light passes through single slit?

A. Interference pattern B. Only bright band C. Uniform light D. Central bright band with alternate dark and bright bands

Q15: Central maxima in single slit diffraction is:

A. Widest and brightest B. Narrow and brightest C. Same width as others D. Completely dark

Q16: Which factor increases fringe width in diffraction pattern?

A. Increase in slit width B. Decrease in wavelength C. Increase in wavelength D. Decrease in screen distance

Q17: Diffraction due to circular aperture gives:

A. Fringe pattern B. Airy disc pattern C. Shadow only D. Color spectrum

Q18: A condition for constructive interference in diffraction is:

A. Path difference = nλ B. Path difference = (2n + 1)λ/2 C. Phase difference = π D. Amplitude difference is maximum

Q19: Which of these phenomena confirms the wave nature of light?

A. Reflection B. Diffraction C. Polarization D. Photoelectric effect

Q20: The central maximum becomes narrower if slit width is:

A. Increased B. Decreased C. Unchanged D. Made infinite