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NEET Mock Test - 4 - NEET MCQ


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30 Questions MCQ Test NEET Mock Test Series - Updated 2025 Pattern - NEET Mock Test - 4

NEET Mock Test - 4 for NEET 2025 is part of NEET Mock Test Series - Updated 2025 Pattern preparation. The NEET Mock Test - 4 questions and answers have been prepared according to the NEET exam syllabus.The NEET Mock Test - 4 MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Mock Test - 4 below.
Solutions of NEET Mock Test - 4 questions in English are available as part of our NEET Mock Test Series - Updated 2025 Pattern for NEET & NEET Mock Test - 4 solutions in Hindi for NEET Mock Test Series - Updated 2025 Pattern course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt NEET Mock Test - 4 | 180 questions in 180 minutes | Mock test for NEET preparation | Free important questions MCQ to study NEET Mock Test Series - Updated 2025 Pattern for NEET Exam | Download free PDF with solutions
NEET Mock Test - 4 - Question 1
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In a compound microscope, the objective and the eyepiece have focal lengths of 1 cm and 5 cm, respectively, and both are kept at a distance of 20 cm. If the final image is formed at the least distance of distinct vision from the eyepiece, find the total magnification.

Detailed Solution for NEET Mock Test - 4 - Question 1

Least distance of distinct vision D = 25 cm

Given Ve = D = 25cm

fe = 5cm

Apply lens formula for the eyepiece

ue = -25/6 = -4.17 cm (left of the eyepiece)

Obtectrve and eyepiece are separated by distance L = 20 cm

As measured from the objective

v0 = L - ue

20 - 4.17

= 15.83

Apply lens formula for the objective

= -107cm (left of the objective)

Total magnification in a compound microscope when the final Image Is formed at D is given by

NEET Mock Test - 4 - Question 2
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A small block is shot into each of the four tracks as shown below. Each of the frictionless tracks rises to the same height. The speed with which the block enters the tracks is the same in all the cases. At the highest point of the track, normal reaction is the maximum in

Detailed Solution for NEET Mock Test - 4 - Question 2
Since the block rises to the same heights in all the four cases, from conservation of energy, speed of the block at highest point will be same in all four cases. Say it is v0.

Equation of motion will be

R (the radius of curvature) in first case is minimum.

Therefore, normal reaction N will be maximum in first case.

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NEET Mock Test - 4 - Question 3
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The extension in a string obeying Hooke's law is 'x'. The speed of sound in the stretched string is 'v'. If the extension in the string is increased to 1.5x, the speed of sound will be

Detailed Solution for NEET Mock Test - 4 - Question 3
Speed of sound in a stretched string v =

where T is the tension in the string and μ is mass per unit length.

According to Hooke's law, F ∝ x

∴ T ∝ x ...(ii)

From Eqs. (i) and (ii)

v ∝ √x

∴ v' = √1.5v = 1.22v

NEET Mock Test - 4 - Question 4
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The equation of a progressive wave is given by Y = 0.2 cos . The distance is expressed in cm and the time in seconds. What will be the minimum distance between the two particles having the phase difference of π/2?
Detailed Solution for NEET Mock Test - 4 - Question 4
Comparing with

y = A cos

We have

We know that 2π/λ x path difference = phase difference

⇒ Path difference = cm = 25 cm

NEET Mock Test - 4 - Question 5
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The time period of a particle in simple harmonic motion is 8 seconds. At t = 0, it is at the mean position. The ratio of the distances travelled by it in the 1st second and the 2nd second is
Detailed Solution for NEET Mock Test - 4 - Question 5
The equation of the simple harmonic motion for a particle is written as

x = Asinωt---(i)

Where ω is the angular frequency

And t is the time taken by the particle

Also it is known that ω = 2π/T

At t = 0 sec the particle is at its mean position.

Given T = 8 sec

When t = 1 sec

Substitute the value of sinπ/4 = 1/√2

The position of the particle at the 1st second is

Similarly when t = 2 sec

Substitute the value of sinπ/2 = 1

The position of the particle at the 2nd second is

⇒ x2 = A

The ratio of the distance travelled by the particle is given by

Option C is the right answer.

NEET Mock Test - 4 - Question 6
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If a wire is stretched such that its length becomes double then
Detailed Solution for NEET Mock Test - 4 - Question 6

Strain in the wire is 50%.

When a wire is stretched such that its length becomes double, the strain is given by:

strain = change in length/original length

Since the original length has doubled, the change in length is equal to the original length. Therefore,

strain = original length/original length = 1

This means that the strain in the wire is 100%, or 1.

NEET Mock Test - 4 - Question 7
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The excess of pressure inside the first soap bubble is √3 times that inside the second bubble. The ratio of volume of the first to that the second bubble is
Detailed Solution for NEET Mock Test - 4 - Question 7

The pressure inside a soap bubble is related to the radius of the bubble by the equation:

Where:

  • P is the pressure inside the bubble,
  • T is the surface tension of the soap film,
  • r is the radius of the bubble.

Given that the excess pressure inside the first soap bubble is ​ times that of the second bubble, we can set up the relationship between the pressures of the two bubbles as:

Simplifying this, we get:

So, the relationship between the radii of the two bubbles is:

Now, the volume of a bubble is given by:

The ratio of the volumes of the two bubbles will be:

Thus, the ratio of the volumes is:

NEET Mock Test - 4 - Question 8
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A metal wire of length L is suspended vertically from a rigid support. When a body of mass M is attached to the lower end of wire, the elongation of the wire is , then the incorrect statement is
Detailed Solution for NEET Mock Test - 4 - Question 8
The decrease in potential energy is Mg

Elastic potential energy stored =

Heat produced =

NEET Mock Test - 4 - Question 9
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The specific heat of substance varies with temperature according to equation C = 2T × 10–3 cal/g K (T is absolute temperature). The amount of heat required to raise the temperature of 100 g of substance from 27°C to 47°C is
Detailed Solution for NEET Mock Test - 4 - Question 9

= 10-3 x 100[(32)2 - (30)2] = 1240 cal

NEET Mock Test - 4 - Question 10
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Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion: Frictional forces are conservating forces.

Reason: Potential energy can be associated with frictional forces.
Detailed Solution for NEET Mock Test - 4 - Question 10
We know that the energy possessed by an object by virtue of its position is the potential energy. Thus, potential energy is associated with conservative only, and since frictional forces are non-conservative forces, potential energy is not associated with them.
NEET Mock Test - 4 - Question 11
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An organic compound which produces a bluish-green coloured flame on heating in the presence of copper is
Detailed Solution for NEET Mock Test - 4 - Question 11
The presence of halogens is revealed by the coloured flame produced when halogen-containing compounds are placed in a flame.

A green-blue flame is formed when the halogen contained in the organic compound is chlorine e.g. C6H5CI.

NEET Mock Test - 4 - Question 12
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Which of the following reagents converts both acetaldehyde and acetone to alkanes?
Detailed Solution for NEET Mock Test - 4 - Question 12
Clemmensen reduction (conc. HCI/Zn-Hg) or Wolf-Kishner reduction (C2H5ONa / NH2NH2) can be used to convert > C = O group into > CH2 group.

NEET Mock Test - 4 - Question 13
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Match the enzymes given in Column I with the reactions they catalyse given in Column II.

Select the correct option.
Detailed Solution for NEET Mock Test - 4 - Question 13
Amylase catalyses the breakdown of starch into glucose and maltose.

Pepsin catalyses the breakdown of proteins into amino acids at acidic pH.

A nuclease is an enzyme capable of cleaving the phosphodiester bonds between nucleotides of nucleic acids.

Invertase is an enzyme that catalyses the hydrolysis of sucrose into fructose and glucose.

NEET Mock Test - 4 - Question 14
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Choose the incorrect match.
Detailed Solution for NEET Mock Test - 4 - Question 14
BrF5 contains one lone pair on ‘Br’ atom hence no bond angle is of 90°.

⇒ lone pairs are present.

sp3 hybrid central atom and all the bond lengths are equal.

∵ No p-orbitals are available on central atom hence all the 3π bonds are formed by d & p orbitals.

NEET Mock Test - 4 - Question 15
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Which one of the following complexes is expected to have the highest stability constant (K)?
Detailed Solution for NEET Mock Test - 4 - Question 15
Stability of complex increases When

1. Charge density of metal ion increasest

2. Ligand is more basic, CN → NH3

NEET Mock Test - 4 - Question 16
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Which of the following is correct about a plant which has a good level of abscisic acid?
Detailed Solution for NEET Mock Test - 4 - Question 16
Abscisic acid is a growth inhibitor and the process of wilting and falling of leaves is called abscission. It also causes the detachment of fruits and flowers from the plant.
NEET Mock Test - 4 - Question 17
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Which of the following structures give rise to the female gametophyte in angiosperms?
Detailed Solution for NEET Mock Test - 4 - Question 17

The correct option for this question is 3. Nucellus and megaspore mother cell (MMC), as the megaspore mother cell (MMC) located within the nucellus of the ovule undergoes meiosis to produce a single functional megaspore, which then develops into the female gametophyte.

NEET Mock Test - 4 - Question 18
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Match the following columns and select the correct option.
Detailed Solution for NEET Mock Test - 4 - Question 18

a) Clostridium butylicum - ii) Butyric acid 
b) Trichoderma polysporum - i) Cyclosporin -A
C) Monascus purpureus - iv) blood cholesterol lowering agent
d) Aspergillus niger - iii) Citric acid  
So, the correct answer is '(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

NEET Mock Test - 4 - Question 19
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Number of base pairs in the DNA of Escherichia coli is
Detailed Solution for NEET Mock Test - 4 - Question 19
E. coli has 4.6 × 106 base pairs in its DNA.
NEET Mock Test - 4 - Question 20
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In the field of molecular genetics, what was the contribution of Watson and Crick?
Detailed Solution for NEET Mock Test - 4 - Question 20
Watson and Crick proposed a simple double helix model for the structure of DNA.
NEET Mock Test - 4 - Question 21
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Histones are
Detailed Solution for NEET Mock Test - 4 - Question 21
Histones are positively charged basic proteins.
NEET Mock Test - 4 - Question 22
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Which of the following strains of Pneumococcus when injected to mice will cause death of that mice?
Detailed Solution for NEET Mock Test - 4 - Question 22
Live strains of Pneumococcus are virulent.
NEET Mock Test - 4 - Question 23
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In the experiment conducted by Hershey and Chase, the supernatant has
Detailed Solution for NEET Mock Test - 4 - Question 23
In Hershey and Chase experiment, supernatant has only protein coats of bacteriophage.
NEET Mock Test - 4 - Question 24
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.

Assertion : Sunflower and Rose are bisexual flowers.

Reason : Flowers in which, the thalamus grows around the ovary fusing with its wall are called epigynous flowers.
Detailed Solution for NEET Mock Test - 4 - Question 24
Sunflower and Rose are bisexual flowers because they contain both androecium (carpels) and gynoecium (stamens).

In epigynous flowers, the margin of thalamus grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. The ovary is said to be inferior e.g., guava, cucumber.

NEET Mock Test - 4 - Question 25
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RNA is a single strand or chain which is formed by end to end polymerisation of a number of ribonucleotides or ribotides. Which of the following RNAs is an adapter molecule which is meant for transferring amino acids to ribosomes for synthesis of polypeptides?
Detailed Solution for NEET Mock Test - 4 - Question 25
A transfer RNA is an adaptor molecule composed of RNA. It is typically 76 to 90 nucleotides in length and serves as the physical link between the mRNA and the amino acid sequence of proteins. This is the reason it is known as an adaptor molecule.
NEET Mock Test - 4 - Question 26
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Proinsulin contains
Detailed Solution for NEET Mock Test - 4 - Question 26
Proinsulin contains three polypeptids chains A, B and C. Removal of C-chain matures insulin in its active from.
NEET Mock Test - 4 - Question 27
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Read the following statements and choose the correct option

A. Agrobacterium tumefaciens, a pathogen of several dicot plants, is able to deliver a piece of DNA known as ‘T-DNA’ into plant host cells, transforming them.

B. Non disarmed retroviruses are used to deliver desirable genes into animal cells.
Detailed Solution for NEET Mock Test - 4 - Question 27
Disarmed retroviruses are used to deliver desirable genes into animal cells.
NEET Mock Test - 4 - Question 28
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Which one of the following aspects is not a component of functional unit of ecosystem?
Detailed Solution for NEET Mock Test - 4 - Question 28
The interaction of biotic and abiotic components results in a physical structure that is characteristic of each type of ecosystem. The important structural features include

(i) Species composition

(ii) Stratification.

Four important functional aspects of the ecosystem are

(i) Productivity,

(ii) Decomposition,

(iii) Energy flow, and

(iv) Nutrient cycling.

Ecological pyramids are graphical representations of numbers, biomass, and energy flow in an ecosystem. An ecological pyramid is meant for study purposes, it is a representation of various attributes of an ecosystem with the help of a diagram.

NEET Mock Test - 4 - Question 29
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Oviducts are lined by
Detailed Solution for NEET Mock Test - 4 - Question 29
Cells of the oviducts are usually columnar in shape but bear numerous cilia at their free surfaces. The ciliated cells serve to move the ovum away from the ovary and towards the uterus.
NEET Mock Test - 4 - Question 30
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Which of the following is the most frequently used techniques in DNA fingerprinting?
Detailed Solution for NEET Mock Test - 4 - Question 30
Variable Number Tandem Repeat (VNTR) is a specific location in a genome where a short nucleotide sequence is organised as a tandem repeat. These can be found on many chromosomes and often show variations in length between individuals. Each variant acts as an inherited allele, allowing them to be used for personal or parental identification. Their analysis is called VNTR technique and is useful in genetics and biology research, forensics and DNA fingerprinting. VNTR technique is the most frequently used technique in forensic and DNA fingerprinting.
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