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S Chand Physics Class 10 Mock test for Students
In a biprism experiment, 60 interference fringes are obtained using sodium Light of wavelength 6000 Å. With the experimental setup unchanged, sodium Light is replaced by mercury Light filtered to a wavelength of 5000 Å. How many fringes will now be observed?
a) 60
b) 65
c) 72
d) 77
Option c – 72
In a biprism arrangement, the separation between successive bright fringes is 0.32 mm when red Light of wavelength 6400 Å is used. What will be the change in this separation if blue Light of wavelength 4800 Å is employed under identical conditions?
a) 0.24 mm
b) 0.16 mm
c) 0.80 mm
d) 0.08 mm
Option d – 0.08 mm
During a biprism experiment, the fringe width increases by 25% when the distance between the slit and the focal plane of the eyepiece is increased by 20 cm. What was the original distance between the slit and the eyepiece?
a) 60 cm
b) 80 cm
c) 100 cm
d) 120 cm
Option b – 80 cm
In a biprism experiment, the distance between the third and the sixth dark fringes on the same side of the central bright fringe is measured as 4.5 mm. What is the fringe width?
a) 2 mm
b) 1 mm
c) 1.5 mm
d) 3 mm
Option c – 1.5 mm
The fringe width in a biprism setup is 0.32 mm when red Light of wavelength 6400 Å is used. If blue Light of wavelength 4000 Å is used with the same arrangement, what is the percentage change in fringe width?
a) 62.5%
b) 50%
c) 37.5%
d) 27.5%
Option c – 37.5%
If the distance between the slit and the eyepiece in a biprism experiment is increased by 20%, while all other parameters remain unchanged, how will the fringe width change?
a) Decrease by 20%
b) Increase by 20%
c) Increase by 10%
d) Remain unchanged
Option b – Increase by 20%
For obtaining clear and distinct interference fringes in a biprism experiment, the refracting edge of the biprism should be:
a) Approximately parallel to the broad slit
b) Exactly parallel to the broad slit
c) Perpendicular to the narrow slit
d) Exactly parallel to the narrow slit
Option d – Exactly parallel to the narrow slit
In a biprism experiment, for which colour of Light is the fringe width maximum?
a) Violet
b) Green
c) Yellow
d) Red
Option d – Red
What is the effect on the interference fringes when the refracting angle of the biprism is increased from 0° to 179°?
a) Fringes move closer together
b) Fringes spread farther apart
c) No change in the fringe pattern
d) Fringes cease to appear
Option b – Fringes spread farther apart
While determining the separation between two virtual sources in a biprism experiment, the eyepiece is moved away from the slit so that its distance from the slit is:
a) Less than four times the focal length of the lens
b) Less than twice the focal length of the lens
c) Equal to the focal length of the lens
d) Greater than four times the focal length of the lens
Option d – Greater than four times the focal length of the lens
In Fresnel’s biprism experiment, if the separation between the two narrow slits is doubled, what adjustment must be made to the distance D between the slits and the screen to keep the fringe spacing unchanged?
a) D
b) 2D
c) D/2
d) 4D
Option b – 2D
In Fresnel’s biprism experiment, what happens if one of the slits is covered with an opaque black sheet?
a) Fringes become broader
b) Fringes become less bright
c) Fringes become narrower
d) Interference fringes disappear
Option d – Interference fringes disappear
What happens to the interference pattern if the biprism is rotated about a horizontal axis?
a) Fringe width decreases
b) Fringe width increases
c) Bright and dark fringes exchange positions
d) Interference fringes vanish
Option d – Interference fringes vanish
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Also, check out:
- ICSE Class 10 Physics Important Questions Chapter wise
- A New Approach to ICSE Physics Class 10 Solutions
- A New Approach to ICSE Physics Class 10
Comprehensive Solution of S Chand Physics Class 10, ideal for concept clarity, exam preparation, and quick revision.