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20 questions
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  • Q1

     Wavefront is the locus of all points, where the particles of the medium vibrate with the same:

    (a) phase

    (d) period

    (c) frequency

    (b) amplitude(

  • Q2

    Huygen’s concept of secondary wave

    is used to determine the velocity of light

    is a geometrical method to find a wavefront

     is used to explain polarisation

    allows us to find the focal length of a thick lens

  • Q3

    The fringe width in a Young’s double slit experiment can be increased if we decrease

    separation of slits

    wavelength of light used

    None of the above 

    distance between slits and screen

  • Q4

    If Young’s double slit experiment is performed in water keeping the rest of the set-up same, the fringes will

    b)increase in width

    d) not be formed

    c)remain unchanged

    a)decrease in width

  • Q5

    Width of darkand bright fringes in interference is:

    A)    β = λD/d

    C)    β = 3λD/d

    D)    β = 3λD/d

    B)    β = 2λD/d

  • Q6

    What happens, if the monochromaticlight used in Young’s double slit experiment is replaced by white light?

    .B) All bright fringes become white

    A) Only the central fringe is white, and all other fringes are coloured.

    D)All bright fringes have colour between violet and red.

    C) No fringes are observed

  • Q7

    Two sources of light are said to be coherent, when they give light waves of same:

    wavelength and constant phase difference

    intensity and wavelength

    phase and speed

     amplitude and phase

  • Q8

    In Young’s double slit experiment, the minimum amplitude is obtained when the phase difference of super-imposing waves is (where n = 1, 2, 3, ...):

    (n + 1) π

    n π 


    (2 n – 1) π

  • Q9

    If the width of the slit in single slit diffrection experiment is doubled, then the central maximum of diffraction pattern becomes:

    sharper and brighter

    broader and brighter 

    sharper and fainter 

     broader adn fainter.

  • Q10

    In Young’s doubleslit experiment is the slit widths are in the ratio 1: 9, the ratio of theintensity at minima to that at maxima will be:





  • Q11

    What happens to theinterference pattern the two slits S1 and S2 inYoung’s double experiment are illuminated by two independent but identical sources?

    Two sets of interferencefringes overlap

    The intensity of the brightfringes doubled

    The intensity of the brightfringes becomes four times

    No interference pattern isobserved

  • Q12

    A parallel beam of light of wavelength600 nm is incident normally on a slit of width ‘a’. If the distance between the slits and the screen is 0.8 m and the distance of 2nd ordermaximum from the centre of the screen is 15 mm, calculate the width of the slit.





  • Q13

    In Young's double slit experiment usingmonochromatic light of wavelength 600nm,interference pattern was obtained on a screen kept 1.5m away from the plane of the two slits.  The distance between the two slits, if fringeseparation/fringe width was found to be 1.0mm is:

    c) 3X10-4m


    b) 10X10-4m

    d) 2X10-4m

  • Q14

    Light of wavelength 6.5 × 10–7 m is made incident on two slits 1 mm apart. The distance between third dark fringe and fifth bright fringe on a screen distant 1 m from the slits will be(a) 0.325 mm(b) 0.65 mm(c) 1.625 mm(d) 3.25 mm

    d) 5.625 mm

    b) 2.625 mm

    c) 0.625 mm

    a) 1.625 mm

  • Q15

    Each point of the wavefront is the source of secondary disturbance and the wavelets originating from these points spread out in all directions with the speed of wave, this is called as

    a) Principle of superposition

    b) Huygens principle

    c) Polarisation

    d) None

    c) Polarisation

    a) Huygens principle

    d) None

    b) Principle of superposition


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