NEET Part Test - 5 - NEET MCQ

# NEET Part Test - 5 - NEET MCQ

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## 180 Questions MCQ Test NEET Mock Test Series 2025 - NEET Part Test - 5

NEET Part Test - 5 for NEET 2024 is part of NEET Mock Test Series 2025 preparation. The NEET Part Test - 5 questions and answers have been prepared according to the NEET exam syllabus.The NEET Part Test - 5 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Part Test - 5 below.
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NEET Part Test - 5 - Question 1

### A uniform, horizontal parallel beam of light is incident upon a prism as shown. The prism is in the shape of a quarter cylinder, of radius R = 5 cm, and has the index of refraction n = 5/3. The width of the region at which the incident rays after normal incidence on plane surface and subsequent refraction at curved surface intersect on x  axis is (Neglect the ray which travels along x-axis as shown in figure)

Detailed Solution for NEET Part Test - 5 - Question 1

The ray just above x-axis shall after refraction at curved surface intersect x axis at (A) a distance x1 from O.

The critical angle for air-glass interface is  . the rays above the ray incident on curved surface at i = 370 shall suffer TIR and need not be considered.

The ray incident as curved surface at θ= 370 after refraction intersect curved surface at (B) a distance x2 from O.

In Δ PBC

NEET Part Test - 5 - Question 2

### Inside a solid glass sphere of radius R , a point source of light lies at a distance x ( x < R) from centre of the sphere. The solid sphere is surrounded by air of refractive index 1. The maximum angle of incidence for  rays incident on the spherical glass- air interface directly from the point source is:

Detailed Solution for NEET Part Test - 5 - Question 2

Let O be the centre and A be the point source for ray incident at any point P thus for maximum angle of incidence i,

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NEET Part Test - 5 - Question 3

### Two transparent slabs are of equal length (thickness). One is made of a material A of R.I. 1.5 and the other is made of materials B and C, the ratio of their thickness being 1: 2. The R.I. of C is 1.6. When light passes through them, the two slabs have the same number of waves. The R.I. of B is (Light is incident normally)

Detailed Solution for NEET Part Test - 5 - Question 3

Given that

Number of waves in A = Number of waves in B + Number of waves in C

Here C is constant (3 x 108 m/s) and frequency f does not depends om medium.

NEET Part Test - 5 - Question 4

An object moves in front of a fixed plane mirror. The velocity of the image of the object is

Detailed Solution for NEET Part Test - 5 - Question 4

When object moves normal to the mirror, image velocity will be opposite to it. when object moves parallel to the mirror, image velocity will be in the same direction.

NEET Part Test - 5 - Question 5

An object and a plane mirror are shown in figure. Mirror is moved with velocity V as shown. The velocity of image is :

Detailed Solution for NEET Part Test - 5 - Question 5

NEET Part Test - 5 - Question 6

The rainbow formed after or during the rain is due to

Detailed Solution for NEET Part Test - 5 - Question 6

Due to T.I. R., light is returned back and due to dispersion light splitted into different colors.

NEET Part Test - 5 - Question 7

In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of θ so that light incident normally on the face AB does not cross the face BC is (given sin–1 (3/5) = 37º)

Detailed Solution for NEET Part Test - 5 - Question 7

(Difination of critical angle)

r = μ of rarer  medium ; μd = μ of denser medium]

θc is the critical angle for the BC boundary
Let us calculate θ when light ray just graes the boundary xy.

Since the ray should not cross  xy, so,

NEET Part Test - 5 - Question 8

In the diagram shown, light is incident on the interface between media 1 (refractive index n1) and 2 (refractive index n2) at angle slightly greater than the critical angle and is totally reflected. The light is then also totally reflected at the interface between media 1 and 3 (refractive index n3) after which it travels in a direction opposite to its initial direction. The media must have a refractive indices such that

Detailed Solution for NEET Part Test - 5 - Question 8

Let the critical angle of interface between media 1 and 2 is c1 and between 1 and 3 is C2

Then  and .

From TIR at second interface 90- C1 > C2. taking sin of both side we get

cos C1 > sin C2 or  or

NEET Part Test - 5 - Question 9

A transparent cylinder has its right half polished so as to act as a mirror. A paraxial light ray is incident from left, that is parallel to principal axis, exits parallel to the incident ray as shown. The refractive index n of the material of the cylinder is :

Detailed Solution for NEET Part Test - 5 - Question 9

⇒

NEET Part Test - 5 - Question 10

If a prism having refractive √2 index, has angle of minimum deviation equal to the angle of refraction of the prism, then the angle of refraction of the prism is:

Detailed Solution for NEET Part Test - 5 - Question 10

NEET Part Test - 5 - Question 11

In the figure shown a convex mirror of radius of curvature 20 cm is shown. An object O is placed in front of this mirror. Its ray diagram is shown. How many mistakes are there in the ray diagram (AB is its  principal axis):

Detailed Solution for NEET Part Test - 5 - Question 11

Error -I

Error- II

NEET Part Test - 5 - Question 12

For a real object, all of the following statements are correct except :

Detailed Solution for NEET Part Test - 5 - Question 12

For a real object a convex mirror always form a virtual image.

NEET Part Test - 5 - Question 13

In the figure shown find the total magnification after two successive reflections first on M1 & then on M2

Detailed Solution for NEET Part Test - 5 - Question 13

For M: 1/v+1/u = 1/f;

1/v = -1/20 + 1/30;

1/v= -10/600; v= -60

m1 = -2

for M2: u= +20. f=10

NEET Part Test - 5 - Question 14

A particle revolves in clockwise direction (as seen from point A) in a circle C of radius 1 cm and completes one revolution in 2 sec. The axis of the circle and the principal axis of the mirror M coincide. Call it AB. The radius of curvature of the mirror is 20 cm. Then the direction of  revolution (as seen from A) of the image of the particle and its speed is

Detailed Solution for NEET Part Test - 5 - Question 14

the image revolves in circle or radius 1/2 cm. image of a radius is erect ⇒particle will revolve in the same direction as the particle. The image will complete one revolution in the same time 2s.

velocity of image = 1.57 cm/s

NEET Part Test - 5 - Question 15

The relative refractive index of glass with respect to a material is 0.9 and the absolute refractive index of glass is 1.512. The refractive index of the material is

Detailed Solution for NEET Part Test - 5 - Question 15

NEET Part Test - 5 - Question 16

A lens of focal length 20.0 cm and aperture radius 2.0 cm is placed at a distance 30.0 cm from a point source of light. On the other side a screen is placed at a distance 50.0 cm from the lens. The radius of spot of light formed on screen is. (Neglect spherical abberation through lens)

Detailed Solution for NEET Part Test - 5 - Question 16

NEET Part Test - 5 - Question 17

A convex lens is cut into two parts in different ways that are arranged in four manners, as shown. Which arrangement will give maximum optical power ?

Detailed Solution for NEET Part Test - 5 - Question 17

Focal length is minimum in case I,therefore power is maximum. (P=(1/f))

NEET Part Test - 5 - Question 18

A ray of light is incident at an angle of incidence 45º on an equilateral prism and emerge at an angle 45º then the refractive index of the medium of the prism is :

Detailed Solution for NEET Part Test - 5 - Question 18

NEET Part Test - 5 - Question 19

The distance of nth bright fringe to the (n+1)th dark fringe in Young's experiment is equal to:

Detailed Solution for NEET Part Test - 5 - Question 19

The distance between nth bright fringe and (n+1)th dark fringe is equal to half of fringe width=

NEET Part Test - 5 - Question 20

In a Young's double slit experiment, d = 1 mm, λ = 6000 Å and D = 1 m (where d, λ and D have usual meaning). Each of slit individually produces same intensity on the screen. The minimum distance between two points on the screen having 75 % intensity of the maximum intensity is :

Detailed Solution for NEET Part Test - 5 - Question 20

The intensity at distance x-from central order bright on screen is

where I0 = maximum intensity
β = fringe width
Hence therequired distance

NEET Part Test - 5 - Question 21

Let S1 and S2 be the two slits in Young’s double slit experiment. If central maxima is observed at P and angle S1PS2 = θ, then the fringe width for the light of wavelength λ will be. (Assume θ to be a small angle)

Detailed Solution for NEET Part Test - 5 - Question 21

NEET Part Test - 5 - Question 22

Figure shows two coherent sources S1-S2 vibrating in same phase. AB is an irregular wire lying at a far distance from the sources S1 and S2.   = 0.12°. How many bright spots will be seen on the wire, including points A and B.

Detailed Solution for NEET Part Test - 5 - Question 22

∴   The number of bright spots will be three
Hence (B)

NEET Part Test - 5 - Question 23

If the ratio of the intensity of two coherent sources is 4 then the visibility [(Imax-  Imin)/(Imax+  Imin)] of the fringes is

Detailed Solution for NEET Part Test - 5 - Question 23

NEET Part Test - 5 - Question 24

In Young’s double slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 A0. If we use monochromatic light of wavelength 6000 A0, then the number of fringes that would be obtained in the same field of view is :

Detailed Solution for NEET Part Test - 5 - Question 24

λ ∞ (Fringe width)

Higher 'λ' means wider fringes.

At higher wavelength, same space on the screen is occupied by wider fringes, and hence lesser number of fringes.

⇒
⇒

⇒ n = 40

NEET Part Test - 5 - Question 25

If the distance between the first maxima and fifth minima of a double slit pattern is 7mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength of the light used is

Detailed Solution for NEET Part Test - 5 - Question 25

there are three and a half fringes

from first maxima to fifth minima as shown.

NEET Part Test - 5 - Question 26

The path difference between two interfering waves at a point on the screen is λ/6. The ratio of intensity at this point and that at the central bright fringe will be : (Assume that intensity due to each slit is same)

Detailed Solution for NEET Part Test - 5 - Question 26

NEET Part Test - 5 - Question 27

In a Young’s double slit experiment, the separation between the slits is d, distance between the  slit and screen is D (D >> d). In the interference pattern, there is a maxima exactly in front for each slit. Then the possible wavelengths used in the experiment are :

Detailed Solution for NEET Part Test - 5 - Question 27

For maxima at 'P' path different at 'P' should be ΔP = λ,2λ, 3λ ....

Hence (C) is possible

NEET Part Test - 5 - Question 28

A point source of light is kept at the centre of a solid transparent sphere. The sphere is surrounded by air . The refractive index of material of sphere for which the rays incident from point source on glass–air interface will suffer total internal reflection is:

Detailed Solution for NEET Part Test - 5 - Question 28

All rays originating from point source are incident normally on glass air interface, hence no ray suffers total internal reflection.

NEET Part Test - 5 - Question 29

A point object ' O ' is at the centre of curvature of a concave mirror. The mirror starts to move at a speed u, in a direction perpendicular to the principal axis. Then the initial velocity of the image is:

Detailed Solution for NEET Part Test - 5 - Question 29

NEET Part Test - 5 - Question 30

In the figure shown an object ‘AB’ makes small angle with the normal line ‘PQ’. The length of ‘AB’ is l. The refractive index of the slab is ‘n’ and the surrounding medium is air. ‘AB’ is seen with the help of paraxial rays, from the left side of the slab. The size of the image of AB is

Detailed Solution for NEET Part Test - 5 - Question 30

Every point of the image will be at distance  towards left of the object.The image will be parallel to 'AB' and of the same size.

NEET Part Test - 5 - Question 31

An opaque sphere of radius a is just immersed in a transparent liquid as shown in figure. A point source is placed on the vertical diameter of the sphere at a distance a/2 from the top of the sphere. One ray originating from the point source after refraction from the air liquid interface forms tangent to the sphere. The angle of refraction for that particular ray is 30º. The refractive index of the liquid is

Detailed Solution for NEET Part Test - 5 - Question 31

Rhe line CE will be angle bisector of ∠BCD

NEET Part Test - 5 - Question 32

A thin oil film of refractive index 1.2 floats on the surface of water ( m=4/3 ) . When a light of wavelength l = 9.6 × 10–7 m falls normally on the film from air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is:

Detailed Solution for NEET Part Test - 5 - Question 32

For normal incidence path difference between ray 1 and ray 2 is 2μ1 t

For minimum thickness increment

⇒

NEET Part Test - 5 - Question 33

In a YDSE experiment if a slab whose refractive index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid-point of screen with 'µ' will be best represented by (µ ³ 1).[ Assume slits of equal width and there is no absorption by slab; mid point of screen is the point where waves interfere with zero phase difference in absence of slab]

Detailed Solution for NEET Part Test - 5 - Question 33

In absence of film or for μ=0 intensity is maximum at screen. As the value of μ is increased,intensity shall decrease and then increase alternately.Hence the correct variation is

NEET Part Test - 5 - Question 34

Two blocks each of mass m lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB & CD of the two blocks are made reflecting. The acceleration of two images
formed in those two reflecting surfaces w.r.t. each other is:

Detailed Solution for NEET Part Test - 5 - Question 34

Acceleration of image in mirror AB   (∵ ViG = -VoG + 2VmG)

= 2 acceleration of mirror

Accekeration of image in mirror CD =

∴ Acceleration of the two image w.r.t each other =

NEET Part Test - 5 - Question 35

A ray is incident on the first prism at an angle of incidence 53º as shown in the figure. The angle between side CA and B'A' for the net deviation by both the prisms to be double of the deviation produced by the first prism, will be :

Detailed Solution for NEET Part Test - 5 - Question 35

Let be the angle of emergence from the first prism be 'e'

snell's law on surface AB

snell;s law on AC

then for net deviation to be double, the incident ray on side A'B' of second prism should make angles i or e with normal.

Hene the angle between the given then will be 2e or i+e

NEET Part Test - 5 - Question 36

Light of wavelength 4000 Å is incident at small angle on a prism of apex angle 4º. The prism has nv = 1.5 & nr = 1.48. The angle of dispersion produced by the prism in this light is :

Detailed Solution for NEET Part Test - 5 - Question 36

Dispersion will not occur for a light of single wave length λ = 4000Å

NEET Part Test - 5 - Question 37

Two plane mirrors are joined together as shown in figure. Two point objects O1 and O2 are placed symmetrically such that AO1 = AO2. The image of the two objects is common if :

Detailed Solution for NEET Part Test - 5 - Question 37

As AB is common and O1B = BI

Δ O1BA and BAI and congurent

By symmetry AI is perpendicular to O1 to O2

and ∠O1BA = ∠BAI

∴ BAI = 450

and ∠BAC = 900

NEET Part Test - 5 - Question 38

Monochromatic light rays parallel to x-axis strike a convex lens AB. If the lens oscillates such that AB tilts upto a small angle q (in radian) on either side of y-axis, then the amplitude of oscillation of image will be (f = focal length of the lens) :

Detailed Solution for NEET Part Test - 5 - Question 38

From the figure :

Amplitude=x=f-fcosθ = f(1-cosθ)= (by binomial expansion)

NEET Part Test - 5 - Question 39

An interference is observed due to two coherent sources 'A' & 'B' having phase constant zero, separated by a distance 4 l along the y - axis where l is the wavelength of the sources. A detector D is moved on the positive x - axis. The number of points on the x - axis excluding the
points, x = 0 & x = ¥ at which maximum will be observed are

Detailed Solution for NEET Part Test - 5 - Question 39

NEET Part Test - 5 - Question 40

The observer 'O' sees the distance AB as infinitely large. If refractive index of liquid is m1 and that of glass is m2, then   is :

Detailed Solution for NEET Part Test - 5 - Question 40

using formula of spherical surface taking 'B' as object

(R being the radius of the curved surface) =

NEET Part Test - 5 - Question 41

An object of height 1 cm is kept perpendicular to the principal axis of a convex mirror of radius of curvature 20 cm. If the distance of the object from the mirror is 20 cm then the distance between heads  of the image and the object will be:

Detailed Solution for NEET Part Test - 5 - Question 41

∴ the distance between tip of the object and image is

NEET Part Test - 5 - Question 42

A thin linear object of size 1 mm is kept along the principal axis of a convex lens of focal length 10 cm. The object is at 15 cm from the lens. The length of the image is:

Detailed Solution for NEET Part Test - 5 - Question 42

NEET Part Test - 5 - Question 43

An object approaches a fixed diverging lens with a constant velocity from infinity along the principal axis. The relative velocity between object and its image will be :

Detailed Solution for NEET Part Test - 5 - Question 43

as u increased Vrel decrease

here u is negetive so when it approach lens it will increase.

NEET Part Test - 5 - Question 44

A ray of light falls on a plane mirror. When the mirror is turned, about an axis which is at right angle to the plane of the mirror through 20º the angle between the incident ray and new reflected ray is 45º. The angle between the incident ray and original reflected ray was therefore :

Detailed Solution for NEET Part Test - 5 - Question 44

If mirror is turned, about an axis perpendicular to plane of mirror, then there will be no change in incident angle and reflected angle so angle between incident & reflected rays after rotation will be same as before

NEET Part Test - 5 - Question 45

The focal length of a lens of refractive index 3/2 is 10 cm in air. The focal length of that lens in a medium of refractive index 7/5 is:

Detailed Solution for NEET Part Test - 5 - Question 45

... (1)

When placed in medium of RI 7/5

.... (2)

Dividing (1) by (2) F' = 70 cm

NEET Part Test - 5 - Question 46

The compound X (C9H7ClO2) is optically active. It mainly exists in enolic form. It racemises due to enolisation. Its structure is :

Detailed Solution for NEET Part Test - 5 - Question 46

NEET Part Test - 5 - Question 47

The correct nucleophilicity order is :

Detailed Solution for NEET Part Test - 5 - Question 47

Due to +m effects

NEET Part Test - 5 - Question 48

Arrange the following Alcohols for decreasing rate of reaction with conc. H2SO4 at 180ºC.

Detailed Solution for NEET Part Test - 5 - Question 48

It is an E1 reaction and rate  carbocation intermediate.

NEET Part Test - 5 - Question 49

Identify Z in the following series

Detailed Solution for NEET Part Test - 5 - Question 49

NEET Part Test - 5 - Question 50

Which of the following compound give methane  on treatment with CH3MgI

Detailed Solution for NEET Part Test - 5 - Question 50

NEET Part Test - 5 - Question 51

End product D of the following reaction will be

Detailed Solution for NEET Part Test - 5 - Question 51

NEET Part Test - 5 - Question 52

The product (C) of the following reaction is :

Detailed Solution for NEET Part Test - 5 - Question 52

NEET Part Test - 5 - Question 53

Detailed Solution for NEET Part Test - 5 - Question 53

NEET Part Test - 5 - Question 54

Detailed Solution for NEET Part Test - 5 - Question 54

Except C=C of cinnamyl like system, LiAlH4 doesnot reduce the C=C bonds.

NEET Part Test - 5 - Question 55

No. of products and number of fraction are respectively:

Detailed Solution for NEET Part Test - 5 - Question 55

,

Total products are six and fractional distillates are five.

NEET Part Test - 5 - Question 56

Observe the following compounds

The incorrect order of reactivity is (towards electrophillic addition)

NEET Part Test - 5 - Question 57

The correct relative rate of reaction of the given alkenes for any given electrophiles is :

Detailed Solution for NEET Part Test - 5 - Question 57

NEET Part Test - 5 - Question 58

Detailed Solution for NEET Part Test - 5 - Question 58

It is an electrophilic addition reaction.

NEET Part Test - 5 - Question 59

NEET Part Test - 5 - Question 60

Which of the following alcohol will be oxidised most readily by K2Cr2O7 / H2SO4 solution ?

Detailed Solution for NEET Part Test - 5 - Question 60

The 1º alcohol is most readily oxidised, because the a-H is abstracted in the slow step.

NEET Part Test - 5 - Question 61

The correct order of resonance energy of the compound is :

Detailed Solution for NEET Part Test - 5 - Question 61

More number of resonating structures in I as compare to II.

NEET Part Test - 5 - Question 62

Detailed Solution for NEET Part Test - 5 - Question 62

N-attached ring is more activated towards electrophilic aromatic substitution reaction.

NEET Part Test - 5 - Question 63

Y is :

Detailed Solution for NEET Part Test - 5 - Question 63

NEET Part Test - 5 - Question 64

Phenol on reaction with Br2 in CS2 or non-polar aprotric solvent furnishes :

Detailed Solution for NEET Part Test - 5 - Question 64

in CS2 medium reactivity os  is less. hence Br is substituted at o & p

NEET Part Test - 5 - Question 65

Among the following which one will show maximum hydration ?

Detailed Solution for NEET Part Test - 5 - Question 65

Due to strong –I effects and formation of intramolecular H bonding.

NEET Part Test - 5 - Question 66

the product C is

Detailed Solution for NEET Part Test - 5 - Question 66

Active methylene groups provides the carbanionic intermediate to facillate the nucleophilic substitution reaction.

NEET Part Test - 5 - Question 67

What is the structure of P.

Detailed Solution for NEET Part Test - 5 - Question 67

NEET Part Test - 5 - Question 68

Cyanohydrin formation constant will be highest for

Detailed Solution for NEET Part Test - 5 - Question 68

More is the electrophilicity of >C=O bond in the aldehyde, easier will be attack of CN, higher willl be cyanohydrin formation constant.

NEET Part Test - 5 - Question 69

CH3CHO + H2NOH → CH3- CH =NOH + H2O. the above reaction occur at

Detailed Solution for NEET Part Test - 5 - Question 69

pH in this reaction is carefully controlled to maintain sufficient nucleophilicity of .

NEET Part Test - 5 - Question 70

Base catalysed aldol condensation occurs with :