HSSC-I (Class-11) Solved Physics MCQs; Unit-9: Physical Optics (Baluchistan Textbook Board, Quetta) With Verified Answers  



1. Who presented the corpuscular theory of light?




... Answer is B. Newton
Newton's presented corpuscular theory of light and Huygen's wave theory


2. Which phenomenon does not explain the wave theory of light?




... Answer is D. Compton effect
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3. Interference of light occurs when the source of light is;




... Answer is D. All of these
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4. In Young's double slit experiment, if the distance between two slits is halved and the distance between slits and the screen is doubled then what will be the fringe width?




... Answer is D. Quadrupled
Δy = `\frac {mλ}{d} = Quadrupled (four times)


5.  In Young's double slit experiment, the ratio of fringe width of bright to dark fringe is;




... Answer is A. 1:1
Bright to dark fringe are equally spaced.


6. In Young's double-slit experiment if white light is used then;




... Answer is A. Bright fringes will be seen
 If white light is used in place of monochromatic light in Young's double slit experiment, then the central fringe will be observed as white and some colored fringes around the central fringes are formed.


7. When light is reflected from dense medium to rare medium than its path different. :




... Answer is B. Changes by `\[frac {λ}{2}]`
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8. Michelson interferometer is an optical instrument that is being used for the measurement of




... Answer is D. Wavelength
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9. Mathematical condition of destructive interference in a thin film is;




... Answer is C. `\[m + 1/2]` λ
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10. Which parameter of light does not change when light is reflected from dense medium to rare medium?




... Answer is A. Frequency `
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11. In the Michelson interferometer, a fringe is changed by changing the position of the movable mirror at a distance




... Answer is B. `\frac {λ}{2}`
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12. Number of slits in a diffraction grating depends upon.




... Answer is C. Wavelength of light
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13. If the wavelength of the incident X-rays is 2 ｘ 10⁻¹⁰ m then the required number of slits per centimeter for its diffraction should be




... Answer is C. 5 ｘ10⁸
--------d = `\frac {1}{N}`


14.  Which phenomenon has confirmed that light is a transverse wave?




... Answer is D. Polarization
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15. If the unpolarized incident light with an intensity I is polarized by a Polaroid sheet, then the intensity of plane-polarized light will be;




... Answer is A. `\frac {I}{2}`
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16.. Which one of the following cannot be polarized.




... Answer is D. Sound waves
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