NEET 2020 Exam Paper (180 Q) - Mock Test

Which of the following is not an attribute of a population?

The process of growth is maximum during:

The roots that originate from the base of the stem are:

Match the following diseases with the causative organism and select the correct option.
| Column - I | Column - II |
| :--- | :--- |
| (a) Typhoid | (i) Wuchereria |
| (b) Pneumonia | (ii) Plasmodium |
| (c) Filariasis | (iii) Salmonella |
| (d) Malaria | (iv) Haemophilus |

In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

Choose the correct pair from the following:

Select the correct match.

Match the following columns and select the correct option.
| Column - I | Column - II |
| :--- | :--- |
| (a) Gregarious, polyphagous pest | (i) Asterias |
| (b) Adult with radial symmetry and larva with bilateral symmetry | (ii) Scorpion |
| (c) Book lungs | (iii) Ctenoplana |
| (d) Bioluminescence | (iv) Locusta |

The infectious stage of Plasmodium that enters the human body is:

Identify the substances having glycosidic bond and peptide bond, respectively in their structure:

The plant parts which consist of two generations - one within the other:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are:

Identify the correct statement with regard to G
1
​
phase (Gap 1) of interphase.

Cuboidal epithelium with brush border of microvilli is found in:

Which of the following statements about inclusion bodies is incorrect?

Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?

In gel electrophoresis, separated DNA fragments can be visualized with the help of:

Identify the wrong statement with reference to transport of oxygen.

Ray florets have:

The specific palindromic sequence which is recognized by EcoRI is:

Identify the wrong statement with regard to Restriction Enzymes.

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external inter-costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases

If the head of cockroach is removed, it may live for few days because:

Which of the following statements are true for the phylum-Chordata?
(a) In Urochordata notochord extends from head to tail and it is present throughout their life.
(b) In Vertebrata notochord is present during the embryonic period only.
(c) Central nervous system is dorsal and hollow.
(d) Chordata is divided into 3 subphyla: Hemichordata, Tunicata and Cephalochordata.

Match the organism with its use in biotechnology.
| Column - I | Column - II |
| :--- | :--- |
| (a) Bacillus thuringiensis | (i) Cloning vector |
| (b) Thermus aquaticus | (ii) Construction of first rDNA molecule |
| (c) Agrobacterium tumefaciens | (iii) DNA polymerase |
| (d) Salmonella typhimurium | (iv) Cry proteins |

Match the following concerning essential elements and their functions in plants:
| Column - I | Column - II |
| :--- | :--- |
| (a) Iron | (i) Photolysis of water |
| (b) Zinc | (ii) Pollen germination |
| (c) Boron | (iii) Required for chlorophyll biosynthesis |
| (d) Manganese | (iv) IAA biosynthesis |

Identify the incorrect statement.

Match the following:
| Column - I | Column - II |
| :--- | :--- |
| (a) Inhibitor of catalytic activity | (i) Ricin |
| (b) Possess peptide bonds | (ii) Malonate |
| (c) Cell wall material in fungi | (iii) Chitin |
| (d) Secondary metabolite | (iv) Collagen |

Meiotic division of the secondary oocyte is completed:

According to Robert May, the global species diversity is about:

The first phase of translation is:

Which of the following regions of the globe exhibits highest species diversity?

Which of the following statements is not correct?

The transverse section of a plant shows following anatomical features:
(a) Large number of scattered vascular bundles surrounded by bundle sheath.
(b) Large conspicuous parenchymatous ground tissue.
(c) Vascular bundles conjoint and closed.
(d) Phloem parenchyma absent.
Identify the category of plant and its part:

Match the following columns and select the correct option.
| Column - I | Column - II |
| :--- | :--- |
| (a) 6 - 15 pairs of gill slits | (i) Trygon |
| (b) Heterocercal caudal fin | (ii) Cyclostomes |
| (c) Air Bladder | (iii) Chondrichthyes |
| (d) Poison sting | (iv) Osteichthyes |

From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:

Embryological support for evolution was disapproved by:

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:

Bt cotton variety that was developed by the introduction of toxin gene of Bacillusthuringiensis (Bt) is resistant to:

Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?
(a) Darwin’s Finches of Galapagos islands.
(b) Herbicide resistant weeds.
(c) Drug resistant eukaryotes.
(d) Man-created breeds of domesticated animals like dogs.

Identify the wrong statement with reference to immunity.

By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams?

Identify the correct statement with reference to human digestive system.

Match the following columns and select the correct option.
| Column - I | Column - II |
| :--- | :--- |
| (a) Clostridium butylicum | (i) Cyclosporin-A |
| (b) Trichoderma polysporum | (ii) Butyric Acid |
| (c) Monascus purpureus | (iii) Citric Acid |
| (d) Aspergillus niger | (iv) Blood cholesterol lowering agent |

Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?

Floridean starch has structure similar to:

Select the option including all sexually transmitted diseases.

Match the following with respect to meiosis:| Column - I | Column - II || :--- | :--- || (a) Zygotene | (i) Terminalization || (b) Pachytene | (ii) Chiasmata || (c) Diplotene | (iii) Crossing over || (d) Diakinesis | (iv) Synapsis |

Which of the following pairs is of unicellular algae?

Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Bt cotton | (i) Gene therapy || (b) Adenosine deaminase deficiency | (ii) Cellular defence || (c) RNAi | (iii) Detection of HIV infection || (d) PCR | (iv) Bacillus thuringiensis |

Montreal protocol was signed in 1987 for control of:

Which of the following is correct about viroids?

The ovary is half inferior in:

The enzyme enterokinase helps in conversion of:

Match the trophic levels with their correct species examples in grassland ecosystem.| Column - I | Column - II || :--- | :--- || (a) Fourth trophic level | (i) Crow || (b) Second trophic level | (ii) Vulture || (c) First trophic level | (iii) Rabbit || (d) Third trophic level | (iv) Grass |

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Organ of Corti | (i) Connects middle ear and pharynx || (b) Cochlea | (ii) Coiled part of the labyrinth || (c) Eustachian tube | (iii) Attached to the oval window || (d) Stapes | (iv) Located on the basilar membrane |

In water hyacinth and water lily, pollination takes place by:

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

In light reaction, plastoquinone facilitates the transfer of electrons from:

Which of the following is not an inhibitory substance governing seed dormancy?

Name the enzyme that facilitates opening of DNA helix during transcription.

Which of the following would help in prevention of diuresis?

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Placenta | (ii) Human Chorionic Gonadotropin (hCG) || (b) Zona pellucida | (iii) Layer of the ovum || (c) Bulbo-urethral glands | (iv) Lubrication of the Penis || (d) Leydig cells | (i) Androgens |

Strobili or cones are found in:

Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage ($G_0$). This process occurs at the end of:

Flippers of Penguins and Dolphins are examples of:

If the distance between two consecutive base pairs is $0.34\text{nm}$ and the total number of base pairs of a DNA double helix in a typical mammalian cell is $6.6\times 10^9\text{bp}$, then the length of the DNA is approximately:

The QRS complex in a standard ECG represents:

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Eosinophils | (iii) Release histaminase, destructive enzymes || (b) Basophils | (iv) Release granules containing histamine || (c) Neutrophils | (ii) Phagocytosis || (d) Lymphocytes | (i) Immune response |

Which of the following statements is correct?

The sequence that controls the copy number of the linked DNA in the vector, is termed:

Identify the basic amino acid from the following.

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Pituitary gland | (iii) Diabetes insipidus || (b) Thyroid gland | (i) Grave’s disease || (c) Adrenal gland | (iv) Addison’s disease || (d) Pancreas | (ii) Diabetes mellitus |

Select the correct statement.

Which one of the following is the most abundant protein in the animals?

Experimental verification of the chromosomal theory of inheritance was done by:

Match the following columns and select the correct option.| Column - I | Column - II || :--- | :--- || (a) Floating Ribs | (iv) Do not connect with the sternum || (b) Acromion | (iii) Clavicle || (c) Scapula | (i) Located between second and seventh ribs || (d) Glenoid cavity | (ii) Head of the Humerus |

The number of substrate level phosphorylations in one turn of citric acid cycle is:

Dissolution of the synaptonemal complex occurs during:

Bilaterally symmetrical and acoelomate animals are exemplified by:

The body of the ovule is fused within the funicle at:

Goblet cells of alimentary canal are modified from:

Snow-blindness in Antarctic region is due to:

Identify a molecule which does not exist.

Find out the solubility of $\text{Ni}(\text{OH}{)}_2$ in $0.1\text{M NaOH}$. Given that the ionic product of $\text{Ni}(\text{OH}{)}_2$ is $2\times 10^{-15}$.

Identify the correct statements from the following:(a) ${\text{CO}}_2(g)$ is used as refrigerant for ice-cream and frozen food.(b) The structure of ${\text{C}}_{60}$ contains twelve six carbon rings and twenty five carbon rings.(c) $\text{ZSM-5}$, a type of zeolite, is used to convert alcohols into gasoline.(d) $\text{CO}$ is colorless and odourless gas.

Hydrolysis of sucrose is given by the following reaction:
$$\text{Sucrose}+{\text{H}}_2\text{O}\rightleftharpoons \text{Glucose}+\text{Fructose}$$
If the equilibrium constant ($K_c$) is $2\times 10^{13}$ at $300\text{K}$, the value of ${\Delta }_r{G}^{\circ }$ at the same temperature will be:

Identify compound X in the following sequence of reactions:

Identify the incorrect match.| Name | IUPAC Official Name || :--- | :--- || (a) Unnilunium | (i) Mendelevium || (b) Unniltrium | (ii) Lawrencium || (c) Unnilhexium | (iii) Seaborgium || (d) Unununnium | (iv) Darmstadtium |

An element has a body centered cubic (bcc) structure with a cell edge of $288\text{pm}$. The atomic radius is:

Which of the following set of molecules will have zero dipole moment?

On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:

Which of the following oxoacid of sulphur has $-O-O-$ linkage?

Which of the following amine will give the carbylamine test?

The calculated spin only magnetic moment of $C{r}^{2+}$ ion is:

The correct option for free expansion of an ideal gas under adiabatic condition is:

The freezing point depression constant ($K_f$) of benzene is $5.12{\text{K kg mol}}^{-1}$. The freezing point depression for the solution of molality $0.078\text{m}$ containing a non-electrolyte solute in benzene is (rounded off upto two decimal places):

The number of Faradays($F$) required to produce $20\text{g}$ of calcium from molten $CaC{l}_2$ (Atomic mass of $Ca=40{\text{g mol}}^{-1}$) is:

Reaction between benzaldehyde and acetophenone in presence of dilute $NaOH$ is known as:

Paper chromatography is an example of:

An increase in the concentration of the reactants of a reaction leads to change in:

A mixture of $N_2$ and $Ar$ gases in a cylinder contains $7\text{g}$ of $N_2$ and $8\text{g}$ of $Ar$. If the total pressure of the mixture of the gases in the cylinder is $27\text{bar}$, the partial pressure of $N_2$ is:[Use atomic masses (in ${\text{g mol}}^{-1}$): $N=14,Ar=40$ ]

Identify the correct statement from the following:

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

Which of the following is a cationic detergent?

Elimination reaction of 2-Bromo-pentane to form pent-2-ene is:(a) $\beta$ -Elimination reaction(b) Follows Zaitsev rule(c) Dehydrohalogenation reaction(d) Dehydration reaction

The mixture which shows positive deviation from Raoult’s law is:

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

Which of the following is a basic amino acid?

$HCl$ was passed through a solution of $CaC{l}_2$, $MgC{l}_2$ and $NaCl$. Which of the following compound(s) crystallise(s)?

Which of the following is a natural polymer?

Which of the following is not correct about carbon monoxide?

Sucrose on hydrolysis gives:

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce $ATP$ and with $Na$, is responsible for the transmission of nerve signals.

Which one of the followings has maximum number of atoms?

The number of protons, neutrons and electrons in ${}_{71}^{175}Lu$, respectively, are:

What is the change in oxidation number of carbon in the following reaction?
$$C{H}_4(g)+4C{l}_2(g)\to CC{l}_4(l)+4HCl(g)$$

Identify the incorrect statement.

For the reaction, $2Cl(g)\to C{l}_2(g)$, the correct option is:

Measuring Zeta potential is useful in determining which property of colloidal solution?

Urea reacts with water to form $A$ which will decompose to form $B$. $B$ when passed through $C{u}^{2+}(aq)$, deep blue colour solution $C$ is formed. What is the formula of $C$ from the following?

Match the following and identify the correct option.| Column - I | Column - II || :--- | :--- || (a) $CO(g)+H_2(g)$ | (iii) Synthesis gas || (b) Temporary hardness of water | (i) $Mg(HC{O}_3{)}_2+Ca(HC{O}_3{)}_2$ || (c) $B_2{H}_6$ | (ii) An electron deficient hydride || (d) $H_2{O}_2$ | (iv) Non-planar structure |

Match the following:| Oxide | Nature || :--- | :--- || (a) $CO$ | (ii) Neutral || (b) $BaO$ | (i) Basic || (c) $A{l}_2{O}_3$ | (iv) Amphoteric || (d) $C{l}_2{O}_7$ | (iii) Acidic |

The rate constant for a first order reaction is $4.606\times 10^{-3}{\text{s}}^{-1}$. The time required to reduce $2.0\text{g}$ of the reactant to $0.2\text{g}$ is:

An alkene on ozonolysis gives methanal as one of the product. Its structure is:

Which of the following alkane cannot be made in good yield by Wurtz reaction?

Anisole on cleavage with $HI$ gives:

For which one of the following, Bohr model is not valid?

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is: ($c$ =speed of electromagnetic waves)

The Brewsters angle $i_b$ for an interface should be:

A cylinder contains hydrogen gas at pressure of $249\text{kPa}$ and temperature $27^{\circ }C$. Its density is: ($R=8.3{\text{J mol}}^{-1}{\text{K}}^{-1}$)

A ray is incident at an angle of incidence $i$ on one surface of a small angle prism (with angle of prism $A$) and emerges normally from the opposite surface. If the refractive index of the material of the prism is $\mu$, then the angle of incidence is nearly equal to:

Two cylinders $A$ and $B$ of equal capacity are connected to each other via a stop cock. $A$ contains an ideal gas at standard temperature and pressure. $B$ is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is:

The energy equivalent of $0.5\text{g}$ of a substance is:

A body weighs $72\text{N}$ on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?

The solids which have the negative temperature coefficient of resistance are:

The phase difference between displacement and acceleration of a particle in a simple harmonic motion is:

A screw gauge has least count of $0.01\text{mm}$ and there are $50$ divisions in its circular scale. The pitch of the screw gauge is:

In a guitar, two strings $A$ and $B$ made of same material are slightly out of tune and produce beats of frequency $6\text{Hz}$. When tension in $B$ is slightly decreased, the beat frequency increases to $7\text{Hz}$. If the frequency of $A$ is $530\text{Hz}$, the original frequency of $B$ will be:

Two particles of mass $5\text{kg}$ and $10\text{kg}$ respectively are attached to the two ends of a rigid rod of length $1\text{m}$ with negligible mass. The centre of mass of the system from the $5\text{kg}$ particle is nearly at a distance of:

Find the torque about the origin when a force of $3\hat{j}\text{N}$ acts on a particle whose position vector is $2\hat{k}\text{m}$.

Light with an average flux of $20{\text{W/cm}}^2$ falls on a non-reflecting surface at normal incidence having surface area $20{\text{cm}}^2$. The energy received by the surface during time span of $1\text{minute}$ is:

A spherical conductor of radius $10\text{cm}$ has a charge of $3.2\times 10^{-7}\text{C}$ distributed uniformly. What is the magnitude of electric field at a point $15\text{cm}$ from the centre of the sphere?($\frac{1}{4\pi {ϵ}_0}=9\times 10^9{\text{N m}}^2{\text{/C}}^2$)

In a certain region of space with volume $0.2{\text{m}}^3$, the electric potential is found to be $5\text{V}$ throughout. The magnitude of electric field in this region is:

The increase in the width of the depletion region in a p-n junction diode is due to:

A $40\mu \text{F}$ capacitor is connected to a $200\text{V}$, $50\text{Hz}$ ac supply. The rms value of the current in the circuit is, nearly:

The mean free path for a gas, with molecular diameter $d$ and number density $n$ can be expressed as:

For transistor action, which of the following statements is correct?

Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

When a uranium isotope ${}_{92}^{235}\text{U}$ is bombarded with a neutron, it generates ${}_{36}^{89}\text{Kr}$, three neutrons and:

The energy required to break one bond in DNA is $10^{-20}\text{J}$. This value in $\text{eV}$ is nearly:

Two bodies of mass $4\text{kg}$ and $6\text{kg}$ are tied to the ends of a massless string. The string passes over a pulley which is frictionless. The acceleration of the system in terms of acceleration due to gravity ($g$) is:

A wire of length $L$, area of cross section $A$ is hanging from a fixed support. The length of the wire changes to $L_1$ when mass $M$ is suspended from its free end. The expression for Young’s modulus is:

The average thermal energy for a mono-atomic gas is: ($k_B$ is Boltzmann constant and $T$, absolute temperature)

Which of the following graph represents the variation of resistivity ($\rho$) with temperature ($T$) for copper?

The color code of a resistance is given as: Yellow, Violet, Brown, Gold. The values of resistance and tolerance, respectively, are:

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

The capacitance of a parallel plate capacitor with air as medium is $6\mu \text{F}$. With the introduction of a dielectric medium, the capacitance becomes $30\mu \text{F}$. The permittivity of the medium is:(${ϵ}_0=8.85\times 10^{-12}{\text{C}}^2{\text{ N}}^{-1}{\text{ m}}^{-2}$)

Dimensions of stress are: