Entry Test 2021 Physics Optics MCQS Online Preparation Sample Paper 1 Questions with Answer

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Optics, Light and Its Optical Properties, Reflection, Speed of light, Refraction.

Step into the enchanting world of optics with Nokryan.com! Optics, the study of the behavior of light, encompasses numerous captivating phenomena. Start by delving into the exploration of light and its optical properties, where this fundamental entity unveils its intriguing characteristics. Move on to examining reflection, observing the captivating interplay of light as it reflects off surfaces and shapes our perception of the surrounding world. Explore the concept of the speed of light, all through Nokryan.com.

1. Who gave the idea of light as wave?

  • Bragg
  • Newton
  • Thomos Young
  • Huygen
    correct

2. Can two head lights of car can produce interference

  • Partly produce interferencecorrect
  • Yes
  • None of these
  • No

3. An oil surface floating on water surface exhibits beautiful colour pattern, which is due to

  • Interference of light
    correct
  • Diffraction of light
  • Reflection of light
  • None of these

4. Huygen’s wave front which sends out secondary wavelets with a speed equal to

  • Speed of propagation greater than wave
  • Speed of propagation less than the wave
  • None of these
  • Speed of propagation of the wavecorrect

5. To observe the phenomenon of interference of light, the light should be

  • Phase coherence
  • Monochromatic
  • Coherent sources
  • All of thesecorrect

6. Who devise the experimental arrangement in 1801 for studying interference effects of light

  • Huygen
  • None of these
  • Young
    correct
  • Newton

7. If the path difference must be an integral multiple of wavelength

  • D Sin θ = λ /m
  • D Sin θ = mλ
    correct
  • D Sin θ = m/λ
  • Sin θ = md/λ

8. A line normal to the wave front is called

  • A ray of light
    correct
  • A beam of light
  • None of these
  • Both

9. The wave propagates in space by the motion of the

  • Wavelength
  • Particles
  • None of these
  • Wave fronts
    correct

10. Light is a type of energy which produces sensation of

  • Sound
  • Feelingcorrect
  • Vision
  • None of these

11. The light from the sun reaches to earth with wave fronts

  • Spherical
  • None of these
  • Cylindrical
  • Plane
    correct

12. Every point of a wave front may be considered as a

  • Source of secondary wave front
    correct
  • Source of wave front
  • None of these
  • Source

13. A spherical wave front is that which has

  • A source
  • None of these
  • An extended source
  • A point source
    correct

14. The idea of light as wave produced by

  • Thomos Young
    correct
  • Newton
  • Huygen
  • Michelson

15. A plane wave front is that which has source

  • Nearest
  • Near
  • None of these
  • Distant
    correct

16. The distance between two concentric wave fronts is

  • None of these
  • A half wavelength
    correct
  • A wavelength
  • Zero

17. The position of a new wave front after a certain interval of time can be found by constructing a surface that is

  • None of these
  • A tangent envelope
    correct
  • A tangent
  • Curved surface

18. The points on a Hugen’s wave front which sends out secondary wavelets are also

  • Source
  • Coherent sources of light
    correct
  • Source of secondary wavelets
  • None of these

19. Wave front if the locus of all points in vibration are in the same

  • All of these
    correct
  • Wavelength
  • Frequency
  • Phase

20. Who confirm the wave theory of light?

  • Newton
  • Neutron
  • Michelson
  • Thomos Youngcorrect

Entry Test 2021 Physics Optics MCQS Online Preparation Sample Paper 2 Questions with Answer

1. The fringe spacing varies directly with

  • Phase coherence
  • All of these
    correct
  • Light of wavelength λ
  • Distance L

2. When ‘θ’ is small then

  • cos θ ≈ sin θ
  • sin θ ≈ ten θcorrect
  • None of these
  • ten θ ≈ sin θ

3. How the fringe spacing varies as the separation of he slits increases

  • Increases very little
  • Decreases
    correct
  • Increases
  • None of these

4. If d = 0.25 cm Y = 0.059 cm L = 100 cm m=2 then λ is equal to

  • 569 nm
  • 596 nm
  • 567 nm
  • 590 nm
    correct

5. The fringe spacing in case of blue light

  • Increases
  • None of these
  • Decreases
    correct
  • Remains the same

6. The plano-convex lens used in the Newton’s rings are of focal length

  • None of these
  • Large
    correct
  • Very large
  • Small

7. Fringe spacing ∆Y is the distance between two adjacent bring fringes

  • ∆Y = Ld/λ
  • ∆Y = dλ/L
  • ∆Y = Lλ/d m
  • ∆Y = Lλ/d
    correct

8. Colours seen on oily water surface by the incident white light is due to

  • Refraction
  • Interference
    correct
  • Reflection
  • Diffraction

9. If λ = 589 nm d = 1.0 mm L = 225 cm then fringe spacing ∆Y is given by

  • 1.37 mm
  • 1.33 mm
    correct
  • 1.80 mm
  • 1.76 mm

10. Point out angle/angle at which the sin θ and tan θ have the same value

  • 4⁰ and 6⁰
  • 2⁰ and 8⁰
  • 2⁰ and 4⁰
    correct
  • 8⁰ and 10⁰

11. If the bright fringe into be observed then we have relation

  • Y = mLd/ λ
  • Y = m λL/dcorrect
  • Y = λL/md
  • Y = λd/mL

12. In the phenomenon of interference, the bright and dark fringes are of

  • Equal width
    correct
  • None of these
  • Different width
  • Dark fringes are thicker than bright

13. If the path difference must be half-integral number wavelength

  • d sin θ = (m + l)λ
  • d sin θ = (m + 1/2) 1/λ
  • d sin θ = (m + 1/2)n/λ
  • d sin θ = (m + 1/2) λ
    correct

14. If the two reflected waves reinforce each other then the film as seen from the parallel beam of monochromic light will look

  • Bright
    correct
  • Sometimes bright and dark
  • None of these
  • Dark

15. In the thin film, the path difference of two reflected ray depends upon

  • Thickness of the film
  • All of these
    correct
  • Angle of incidence
  • Nature of the film

16. A thin film is a transparent medium whose thickness with the wavelength of light are

  • Not comparable
  • Both
  • None of these
  • Comparable
    correct

17. The fringe spacing in case of red light

  • Remains the same
  • Decreases
  • Increases
    correct
  • None of these

18. If the dark fringe is to be observed then we have relation

  • Y = (m + 1/2) λd/L
  • Y = (m + 1/2) dL/λ
  • Y = (m + 1/2) λL/d
    correct
  • Y = (m + 1) λL/d

19. If the thickness of the film and angle of incidence are such that two reflected waves cancel each other the film will look

  • Bright
  • Dark
    correct
  • None of these
  • May be partly bright

20. If ‘d’ ‘m’ and fringe spacing ∆Y are known, the interference effect due to light of λ

  • None of these
  • Cannot be determined
  • Can be determined in same cases
  • Can be determined
    correct

Entry Test 2021 Physics Optics MCQS Online Preparation Sample Paper 3 Questions with Answer

1. The distance between the two mirrors can be varied by

  • Moving glass plate
  • Movable mirror
    correct
  • None of these
  • Compensator plate

2. The setting of Newton’s rings is

  • None of these
  • A plano convex lens (long focal length) and the plane of glass plate
    correct
  • A plano convex lens and the plane glass plate
  • A plano convex lens and simple glass sheet

3. In Newton’s rings the point of contact of the lens and the glass plate the air film is

  • Maximum
  • Zero
    correct
  • Minimum
  • None of these

4. According to the relation for constructive destructive interference, the point of contact has zero thickness of air so it should have

  • Conductive interference
    correct
  • None of these
  • No interference
  • Destructive interference

5. Measurement of a standard meter in terms of the wavelength of red cadmium light is

  • 1,563,163.5
  • 1,553,363.5

  • 1,553,163.5correct
  • 155,553.5

6. Newton’s rings are formed due to

  • Refraction
  • Diffraction of light
  • Interference of light
    correct
  • None of these

7. The principle of Michelson’s interferometers is

  • Reflection
  • Interference
    correct
  • Dispersion
  • Refraction

8. Diffraction of light occurs, due to the interference between rays coming from the same wave front of

  • The different parts
    correct
  • The same parts
  • None of these
  • Mixed rays

9. Michelson’s interferometer is an instrument used to measure the distance with

  • None of these
  • Precision
  • Extremely high precision
    correct
  • High Precision

10. When the movable mirror move, the distance λ/4 the total path difference would be?

  • 2/4λ
    correct
  • λ
  • None of these

11. Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

  • Decreasing gradually
  • It is constant at the center
  • None of these
  • Increasing gradually
    correct

12. The relation between displacement of the mirror ‘L’ and wavelength λ of the light used

  • L = λ/2m
  • L = mλ/2
    correct
  • L = 2mλ
  • None of these

13. The central point in the Newton’s rings in dark due to

  • Destructive interference
  • Constructive interference
  • B and C
    correct
  • Additional of path difference λ/2

14. The function of compensator plate in interferometer is to With the help of interferometer, we can find the

  • Interfere properly
  • None of these
  • Reflecting light properly
  • To equalize the distance of M₁ and M₂
    correct

15. When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is

  • 10¯⁵ mm
  • 100 nm
  • 10¯⁴nm
    correct
  • 10¯⁶ mm

16. If the light travels in a straight line, the central region should appear

  • No effect
  • Dark
    correct
  • None of these
  • Bright

17. With the help of interferometer, we can find the

  • None of these
  • Phase
  • Frequency
  • Wavelength
    correct

18. The phenomenon is found to be prominent when size of the opening (aperture) is

  • None of these
  • Equal of light used
  • Greater than wavelength of light
  • Smaller than wavelength of light
    correct

19. Albert A. Michelson devised interferometer is

  • 1881
    correct
  • 1820
  • 1860
  • 1845

20. In young’s double slit experiment for the interference of light, the central region of the fringe system is

  • Brightcorrect
  • None of these
  • Dark
  • Bright and dark

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