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9th Chapter

## First Year Physics Chapter 9 Online MCQ Test for 1st Year Physics Chapter 9 (Physical Optics)

This online test contains MCQs about following topics:

Wave Fronts - Huygen's principle - Interferance of Light Waves - Young's Double slit Experiment - Interference in Thin Films - Newton's Rings - Michelson's Interferometer - Diffraction of Light - Diffraction due to a Narrow slit - Diffraction Grating - Diffraction of X-Rays by Crystals - Polarization

#### FSC Part 1 Physics Ch. 9 Test

Start Physics Ch. 9 Test

### First Year Physics Chapter 9 Online MCQ Test for 1st Year Physics Chapter 9 (Physical Optics)

Sr. # Questions Answers Choice
1 X-ray diffraction has been very useful in determining the structure of
• A. Hemoglobin
• B. Stars
• C. Galaxies
• D. Stones
2 When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes and observed, The wavelength of light used is.
• A. 5000 m
• B. 50000 A<sup>o</sup>
• C. 500 cm
• D. 2000 A<sup>o</sup>
3 Dark fringes are also called as
• A. Minima
• B. Maxima
• C. Wave front
• D. Ray of light
4 Oil film floating on water exhibits colours due to
• A. Interference
• B. Diffraction
• C. Polarization
• D. All of these
5 In case of point source the shape of wave front is.
• A. Plane
• B. spherical
• C. Circular
• D. Eliptical
6 In red light is used as compare to blue light then fringe spacing.
• A. Decreases
• B. Remain same
• C. Increases
• D. Becomes zero
7 A ray of light is a line
• A. Parallel to wave front
• B. Normal to wave front
• C. Anti-parallel to wave
• D. Any one of these
8 the locus of all pint in the same wave of vibration is called.
• A. Wave front
• B. Diffraction
• C. Interference
• D. Polarization
9 A typical diffraction grating has certain number of lines per centimeter whose range is.
• A. 40 to 50
• B. 400 to 5000
• C. 400 to 500
• D. 4000 to 5000
10 Sodium chloride in a flame gives
• A. Green light
• B. White light
• C. Red light
• D. Yellow light

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