datavorous/entrance-exam-dataset huggingface dataset:
The enthalpy of neutralization of NH4OH and CH3COOH is -10.5 kcal mol-1â and enthalpy of neutralisation of NH4OH with a strong acid is -11.7 kcal mol-1. The enthalpy of ionization of CH3COOH will be

Options:
A 4.0 kcal mol-1
B 3.0 kcal mol-1
C 1.2 kcal mol-1
D 3.2 kcal mol-1

The correct answer is:
1.2 kcal mol-1

Solution:
Enthalpy of neutralisation is the amount of energy released during the combination of one moe strong monobasic acid neutralised with the one-mole strong monoacidic base.

H+aq + OH-aq→H2Ol ∆neut.H =-13.7 kcal

Enthalpy of ionisation of CH3COOH & NH4OH together

= - 10.5 - - 13.7 = + 3.2 Kcal

Enthalpy of ionisation of only NH4OH

=-11.7--13.7=+2 Kcal
Enthalpy of ionisation of only CH3COOH
=3.2-2=1.2 Kcal

Topic: Chemistry, Thermodynamics (C), NEET
The enthalpy of vaporisation of a substances is 840 J mol-1 and its boiling point is -173°C . Its enthalpy of vaporisation is

Options:
A 8.4 Jmol-1K-1
B 49 mol-1K-1
C 21 mol-1K-1
D 12 mol-1K-1

The correct answer is:
8.4 Jmol-1K-1

Solution:
ΔSvap=qrevT=ΔHvapT
=840(-173+273)K
=8.4Jmol-1K-1 .

Topic: Chemistry, Thermodynamics (C), NEET
The enthalpy of vaporization of liquid is 30 kJ molâ1 and entropy of vapourisation is 75 J molâ1 K. The boiling point of the liquid at 1 atm is

Options:
A 250 K
B 400 K
C 450 K
D 600 K

The correct answer is:
400 K

Solution:
ds=dqrevT⇒75=30×103T⇒T=400 K
Hence (B) is correct option.

Topic: Chemistry, Thermodynamics (C), NEET
The enthalpy of vapourisation of CCl4is 30.5 kJ mol–1. Calculate the heat required for the vapourisation of 284 g of CCl4at constant pressure. (Molar mass of CCl4= 154 g mol–1).

Options:
A 42.8kJ
B 65.4kJ
C 56.2 kJ
D 74.1kJ

The correct answer is:
56.2 kJ

Solution:
Correct Option is : (C)
56.2 kJ

Topic: Chemistry, Thermodynamics (C), NEET
The enthalpy of vapourization of a liquid is 30 kJ mol-1 and entropy of vapourization is 75 J mol-1K-1 . The boiling point of the liquid at 1 atm is

Options:
A 600 K
B 250 K
C 400 K
D 450 K

The correct answer is:
400 K

Solution:
T b = ΔH vap ΔS = 30000 75 =400 K

Topic: Chemistry, Thermodynamics (C), NEET
The entire body of molecular biology was a consequent development with major contributions from

Options:
A Tansley, Aristotle, Nirenberg, Khorana, Kornberg, Benzer, Monod, Brenner
B Watson, Crick, Humboldt, Darwin, Kornberg, Benzer, Monod, Brenner
C Watson, Crick, Nirenberg, Khorana, Kornberg, Erlich, Mendel
D Watson, Crick, Nirenberg, Khorana, Kornberg, Benzer, Monod, Brenner

The correct answer is:
Watson, Crick, Nirenberg, Khorana, Kornberg, Benzer, Monod, Brenner

Solution:
The entire body of molecular biology was a consequent development with major contributions from Watson, Crick, Nirenberg, Khorana, Kornbergs (father and son), Benzer, Monod, Brenner, etc. A parallel problem being tackled was the mechanism of evolution.

Topic: Biology, Principles of Inheritance and Variation, NEET
The entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called

Options:
A Gene pool
B Germplasm
C Genome
D Genotype

The correct answer is:
Germplasm

Solution:
Collection and preservation of all the different wild varieties, species, and relatives of the cultivated species (followed by their evaluation for their characteristics) is a pre-requisite for the effective exploitation of natural genes available in the populations. The entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called germplasm collection.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?

Options:
A The same diesel engine is used in CNG buses making the cost of conversion low
B It is cheaper than diesel
C It can not be adulterated like diesel
D CNG burns more efficiently than diesel

The correct answer is:
The same diesel engine is used in CNG buses making the cost of conversion low

Solution:
All the buses of Delhi were converted to run on CNG by the end of 2002.

The true statements are:

CNG burns most efficiently, unlike petrol or diesel, in the automobiles and very little of it is left unburnt. Moreover, CNG is cheaper than petrol or diesel, cannot be siphoned off by thieves and adulterated like petrol or diesel.

Topic: Biology, Environmental Issues, NEET, NEET 2022 (Phase 1)
The entire sequence of communities that successively change in a given area is called ________.

Options:
A Climax Community
B Sere
C Pioneer community
D standing state

The correct answer is:
Sere

Solution:
The gradual and fairly predictable change in the species composition of a given area is called ecological succession. Sere is entire sequence of communities that successively change in a given area.
These changes is orderly, sequential and parallel with the changes in the physical environment. These
changes finally result in a community that is nearly in equilibrium with the environment. This community is
termed as climax community.

Topic: Biology, Ecosystem, NEET
The entry of food into the larynx is prevented by:

Options:
A A cartilaginous flap
B The glottis
C The pharynx
D The foodpipe

The correct answer is:
A cartilaginous flap

Solution:
The pharynx opens through the larynx region into the trachea. The larynx is a cartilaginous box which helps in sound production and hence called the soundbox. During swallowing, glottis can be covered by a thin elastic cartilaginous flap called epiglottis to prevent the entry of food into the larynx.

Topic: Biology, Breathing and Exchange of Gases, NEET
The enzyme (a) is needed for isolating genetic material from plant cells and enzyme (b) for isolating genetic material from fungus. Choose the correct pair of options from the following:

Options:
A (a) Cellulase (b) Protease
B (a) Cellulase (b) Chitinase
C (a) Chitinase (b) Lipase
D (a) Cellulase (b) Lipase

The correct answer is:
(a) Cellulase (b) Chitinase

Solution:
Cellulase can degrade cellulosic cell wall of plant cell while chitinase is used for degrading Chitin (Fungal cellulase) for obtaining DNA from cell.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2022 (Phase 2)
The enzyme activity can be completely stopped by

Options:
A Removing its product as fast as it is formed
B Doubling its concentration
C Decreasing its concentration
D Blocking its active site

The correct answer is:
Blocking its active site

Solution:
An active site of an enzyme is a crevice or pocket into which the substrate fits. Thus, enzymes catalyze reactions at a high rate through their active site. Once the site is blocked, the enzyme-substrate reaction is stopped, as the substrate cannot complete the reaction without forming its complex with the enzyme at the active site.

Topic: Chemistry, Biomolecules, NEET
The enzyme ADA, that is crucial for the immune system to function is abbreviated as:

Options:
A Adenosine deoxyaminase
B Adenosine deaminase
C Aspartate deaminase
D Arginine deaminase

The correct answer is:
Adenosine deaminase

Solution:
Adenosine deaminase is the enzyme that is necessary for the immune system to function and deficiency of this enzyme results in diseases called SCIDS (Severe combined immune deficiency syndrome). First gene therapy was given to four year old girl suffering from ADA deficiency.

Topic: Biology, Biotechnology and Its Applications, NEET
The enzyme DNA polymerase, observed to be active in the process of DNA replication, is involved in the synthesis of

Options:
A a polypeptide using DNA as a template
B a strand of DNA using a polypeptide as a template
C a strand of DNA using DNA as a template
D a strand of DNA using RNA as a template

The correct answer is:
a strand of DNA using DNA as a template

Solution:
DNA-dependent DNA polymerase is a polypeptide acting as a biocatalyst. This enzyme is required to make new strand of DNA in the DNA replication process. For it to work efficiently, it requires a template. Thus, it uses the old DNA strand as template to make new strand by adding nucleotides one by one. Reverse transcriptase has the ability to make DNA using RNA as template.

Topic: Biology, Molecular Basis of Inheritance, NEET
The enzyme enterokinase helps in conversion of

Options:
A trypsinogen into trypsin
B caseinogen into casein
C pepsinogen into pepsin
D protein into polypeptides

The correct answer is:
trypsinogen into trypsin

Solution:
The pancreatic juice contains inactive enzymes- trypsinogen, chymtorysinogen, procarboxypetidases, amylases, lipases and nucleases. Trypsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa into active trypsin, which in turn activates the other enzymes in the pancreatic juice.

Trypsigogen →Enterokinase Trypsin(Inactive) (Active)

Topic: Biology, Digestion and Absorption, NEET, NEET 2020 (Phase 1)
The enzyme missing in Phenylketonuria is

Options:
A Phenyl alanine hydroxylase
B Phenyl alanine reductuse
C Phenyl oxidase
D Phenyl oxidoreductase

The correct answer is:
Phenyl alanine hydroxylase

Solution:
Phenylketonuria is an autosomal recessive disorder in which non-formation of enzyme phenylalanine hydroxylase results in the accumulation of phenylalanine. This gets converted to phenylpyruvate which gets accumulated in CNS and results in mental retardation. It also shows multiple phenotypic effects; this is also an example of pleiotropy.

Topic: Biology, Principles of Inheritance and Variation, NEET
The enzyme nitrogenase is highly sensitive to the molecular oxygen as it requires anaerobic condition. In nodule anaerobic condition is provided by

Options:
A Nod factor
B bacteroids
C Leghaemoglobin
D Auxin

The correct answer is:
Leghaemoglobin

Solution:
Leghaemoglobin functions as oxygen scavenger and has high affinity for oxygen. It is synthesized by host cell and surrounds the bacteroid present in root nodule. It takes the oxygen, thereby protecting the enzyme nitrogenase from oxidation.

Topic: Biology, Mineral Nutrition, NEET
The enzyme nitrogenase is

Options:
A A Cu-Fe protein
B Found in prokaryotes only
C An O2 requiring enzyme
D Essential to convert NH3 to N2

The correct answer is:
Found in prokaryotes only

Solution:
The enzyme complex nitrogenase consists of two subunits:
(i) A non-heme iron protein commonly called Fe protein (or dinitrogen reductase, component I).
(ii) An iron-molybdenum protein called MoFe protein (or dinitrogenase, component II).
It is found in prokaryotes only and functions under anaerobic conditions.

Topic: Biology, Mineral Nutrition, NEET
The enzyme present in RBC at higher concentration is __________.

Options:
A DNA gyrase
B Pepsin
C DNA polymerase
D Carbonic anhydrase

The correct answer is:
Carbonic anhydrase

Solution:
RBCs contain a very high concentration of the enzyme, carbonic anhydrase, and minute quantities of the same is present in the plasma too. This enzyme facilitates the reversible conversion of CO2 and H2O to HCO3. The enzyme catalyzes a reaction by increasing the rate of the reaction in a normal cellular condition. Carbonic anhydrase is one of the fastest enzyme which increases the speed of the reaction by forming 600000 molecules of product per second.

Topic: Biology, Breathing and Exchange of Gases, NEET
The enzyme recombinase is required at which stage of meiosis:

Options:
A Pachytene
B Zygotene
C Diplotene
D Diakinesis

The correct answer is:
Pachytene

Solution:
The characters of Pachytene/Pachynema are as follows-

Crossing over i.e. exchange of segments between non-sister chromatids of homologous chromosome occurs at this stage.

Chromatids of pachytene chromosome are attached with centromere.

A tetrad consists of two sets of homologous chromosomes each with two chromatids. Each tetrad has four kinetochore (two sister and two homologous).

A number of electron dense bodies about 100 nm in diameter are seen at irregular intervals within the centre of the synaptonemal complex, known as recombination nodules.

Enzyme recombinase is responsible for causing crossing over.

Crossing over leads to recombination of genes and hence, variations.

Topic: Biology, Cell Cycle and Cell Division, NEET, NEET 2014
The enzyme recombinase is required at which stage of meiosis?

Options:
A Pachytene
B Zygotene
C Diplotene
D Diakinesis

The correct answer is:
Pachytene

Solution:
The first phase of Meiosis 1 is Prophase 1. It is further divided into five phases. 1) Leptotene: Condensation of Chromatin material takes place in this stage 2) Zygotene: The homologous chromosome formation is seen in this stage and formation of synaptonemal complex occurs. 3) Pachytene: At this point a tetrad of chromosomes is formed and this is known as bivalent. Crossing over is also seen in this stage Thus recombination nodules are formed which requires Recombinase enzymes. 4) Diplotene: The synaptonemal complex degrades and chaismata formation is seen. 5) Diakinesis: This is the final stage of Prophase. Here the chromosomes condense further. Four proper tetrads are visible. This marks the end of Prophase-1

Topic: Biology, Cell Cycle and Cell Division, NEET
The enzyme responsible for oxidative decarboxylation of pyruvate to acetyl Co-A is

Options:
A Hexokinase
B Succinic dehydrogenase
C Pyruvate dehydrogenase
D RuBP carboxylase / oxygenase

The correct answer is:
Pyruvate dehydrogenase

Solution:
Pyruvate, which is formed by the glycolytic catabolism of carbohydrates in the cytosol, after it enters the mitochondrial matrix undergoes oxidative decarboxylation by a complex set of reactions catalyzed by pyruvic dehydrogenase. The reactions catalyzed by pyruvic dehydrogenase require the participation of several coenzymes, including NAD+ and Coenzyme A. During this process, two molecules of NADH are produced from the metabolism of two molecules of pyruvic acid (produced from one glucose molecule during glycolysis).

Topic: Biology, Respiration in Plants, NEET
The enzyme salivary amylase breaks down starch into maltase at a pH of

Options:
A 2.1
B 6.8
C 5.8
D 7.0

The correct answer is:
6.8

Solution:
The saliva secreted into the oral cavity contains
electrolytes and enzymes, such as salivary amylase and lysozyme. The chemical process of digestion is initiated in the oral cavity by the hydrolytic action of the carbohydrate splitting enzyme, the salivary amylase. Approximately 30% of starch is hydrolysed here by this enzyme (optimum pH 6.8) into a disaccharide: maltose.

Topic: Biology, Digestion and Absorption, NEET
The enzyme that catalyses peptide bond formation is located in

Options:
A In DHU loop of tRNA
B Smaller subunit of ribosome
C Larger subunit of ribosome
D On mRNA

The correct answer is:
Larger subunit of ribosome

Solution:
Peptide bond formation is catalyzed by enzyme peptidyl transferase which is a ribozyme. High molecular weight rRNA, 23S in prokaryotes, and 28S in eukaryotes function as a ribozyme. These rRNAs are located in a larger subunit of the ribosome at P site.

Topic: Biology, Molecular Basis of Inheritance, NEET
The enzyme that catalyzes the digestion of food belongs to the class of enzymes

Options:
A Transferase
B Hydrolase
C Lyases
D Ligases

The correct answer is:
Hydrolase

Solution:
Enzymes catalyzing the hydrolysis of ester, ether, peptide, glycosidic, C-C, C-halide, or P-N bonds.

Topic: Chemistry, Biomolecules, NEET
The enzyme that is not present in succus entericus is:

Options:
A Nucleases
B Nucleosidase
C Lipase
D Maltase

The correct answer is:
Nucleases

Solution:
The intestinal mucosal epithelium has goblet cells that secrete mucus. The secretions of the brush border cells (crypts of Lieberkuhn) of the mucosa along with the secretions of the goblet cells constitute the intestinal juice or succus entericus. This intestinal juice contains a variety of enzymes like disaccharidases (e.g., maltase), dipeptidases, lipases, nucleosidases, etc.

Topic: Biology, Digestion and Absorption, NEET, NEET 2015 (Phase 2)
The enzyme used to join the DNA fragments is

Options:
A Topoisomerase
B Adenosine deaminase
C DNA ligase
D DNA polymerase

The correct answer is:
DNA ligase

Solution:
DNA ligase is an enzyme used to join the DNA fragments. This enzyme catalyzes the formation of a covalent bond between adjacent 5' - P and 3' - OH termini in broken polynucleotide strands of dsDNA.

Topic: Biology, Cell - The Unit of Life, NEET
The enzyme which converts glucose into ethyl alcohol is

Options:
A Diastase
B Maltase
C Zymase
D Invertase

The correct answer is:
Zymase

Solution:
C 6 H 1 2 O 6 ⟶ Zymase Yeast C 2 H 5 OH + 2 CO 2 Glucose Ethyl alcohol

Topic: Biology, Microbes in Human Welfare, NEET
The enzyme which converts proteins to amino acids is

Options:
A Urease
B Diastase
C Zymase
D Pepsin

The correct answer is:
Pepsin

Solution:
Correct Option is : 4
Pepsin

Topic: Chemistry, Surface Chemistry, NEET
The enzyme which does not directly act upon the food substrate in the small intestine of man, is

Options:
A Amylopsin
B Lipase
C Enterokinase
D Trypsin

The correct answer is:
Enterokinase

Solution:
Enzyme enterokinase is present in succus entericus. It does not directly act upon the food substrate. It activates trypsinogen into active trypsin. Trypsin is a proteolytic enzyme and directly acts upon peptones and large peptides.

Topic: Biology, Digestion and Absorption, NEET
The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called:

Options:
A maltase
B lipase
C zymase
D pepsin

The correct answer is:
lipase

Solution:
Lipase acts on fats, converting them to fatty acid and glycerol. Maltase act on maltose and convert it to glucose. Zymase carry out the fermentation of glucose to break the chemical bonds of the glucose to form alcohol, and carbon dioxide. Pepsin acts on proteins and convert them to peptides and peptones.

Topic: Chemistry, Chemistry in Everyday Life, NEET, NEET 2004
The enzymes involved in the transfer of electrons are named as

Options:
A Isomerases
B Transferases
C Oxidoreductases
D Lyases

The correct answer is:
Oxidoreductases

Solution:
In biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule, the reductant, also called the electron donor, to another, the oxidant, also called the electron acceptor. This group of enzymes usually utilizes NADP or NAD+ as cofactors.

Topic: Chemistry, Biomolecules, NEET
The enzymes that are present in the saliva are

Options:
A Ptyalin, sucrase and amylase
B Lysozyme, amylase and zymase
C Amylase, sucrase and ptyalin
D Ptyalin, lipase and lysozyme

The correct answer is:
Ptyalin, lipase and lysozyme

Solution:
The saliva secreted by the salivary glands contains enzymes like salivary amylase that converts starch into a disaccharide. The lingual lipase is an enzyme that breaks down triglycerides and the enzyme lysozyme also called as muramidase or N-acetylmuramide glycanhydrolase digests the Gram +ve bacteria cell wall peptidoglycan.

Topic: Biology, Digestion and Absorption, NEET
The enzymes that catalyze the removal of groups from substrates by mechanisms other than hydrolysis by forming double bonds is

Options:
A hydrolase
B ligase
C lyase
D isomerase

The correct answer is:
lyase

Solution:
Enzyme that catalyses removal of groups from the substrates by mechanism other than hydrolysis leaving double bonds are called as lyases. They break large molecule into smaller molecule without involving water molecule.

Topic: Chemistry, Biomolecules, NEET
The epithelial tissue present on the inner surface of bronchioles and fallopian tubes is

Options:
A cuboidal
B glandular
C ciliated
D squamous

The correct answer is:
ciliated

Solution:
Ciliated columnar epithelium lines respiratory tract (lower end of bronchi), fallopian tubes, ventricles of brain (ependyma) central canal of spinal cord, etc.
Cuboidal epithelium occurs in certain parts of nephrons of the kidneys.
Glandular epithelium are specialized for secretory activities, eg, unicellular, multicellular, exocrine, endocrine, heterocrine glands, etc.
Squamous epithelium forms lining of blood vessels, lymph vessel, heart, peritoneum, pleura, Bowman's capsule, etc.

Topic: Biology, Structural Organisation in Animals, NEET, NEET 2009 (Screening)
The epithelial tissues are characterised by:

Options:
A Tight junction, adhering junction and gap junction.
B Tight junction and gap junction.
C Gap junction only.
D Tight junction only.

The correct answer is:
Tight junction, adhering junction and gap junction.

Solution:
All cells in the epithelium are held together with little intercellular material. In nearly all animal tissues, specialised junctions provide both structural and functional links between its cells. Three types of cell junctions are found in the epithelium and other tissues. These are called as tight, adhering and gap junctions. Tight junctions help to stop substances from leaking across a tissue. Adhering junctions perform cementing to keep neighbouring cells together. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.

Topic: Biology, Structural Organisation in Animals, NEET
The equation for the reaction in the figure below is :
H 2 g + I 2 g + Heat â 2 HI g

At instant 3 min, what change was imposed into the equilibrium?

Options:
A Pressure was increased
B Temperature was increased
C Volume of system decreased
D Catalyst added to reaction mixture

The correct answer is:
Temperature was increased

Solution:
Temp. increase favours endothermic reaction in forward direction i.e.
[HI] increased
[I2 ], [H2 ] decreased
Increase in pressure has no effect.

Topic: Chemistry, Chemical Equilibrium, NEET
The equation of a progressive wave can be given by y=15 sin (660 Ït-0.02 Ïx) cm. the frequency of the wave is

Options:
A 330 Hz
B 342 Hz
C 365 Hz
D 660 Hz

The correct answer is:
330 Hz

Solution:
Given that y=15sin (660 Ït-0.02Ïx)
Comparing with general equation of progressive wave, we get
y=x,t=asinâ¡2ÏTt-2ÏÎ»x
â´2ÏT=660Ï
or 1T=330 or v=330 Hz

Topic: Physics, Waves and Sound, NEET
The equation of a progressive wave is given by y=asin⁡628t-31.4x. If the distances are expressed in cm and time in seconds, then the wave velocity will be

Options:
A 314 cm s-1
B 628 cm s-1
C 20 cm s-1
D 400 cm s-1

The correct answer is:
20 cm s-1

Solution:
Wave equation is y=asin⁡628t-31.4x
Wave speed is given by,
v=Coefficient of tCoefficient of x
v=62831.4
v=20 cm s-1

Topic: Physics, Waves and Sound, NEET
The equation of a simple harmonic wave is given by y=6sin 2Ï(2t-0.1x), where x and y are in mm and t is in second. The phase difference between two particles 2 mm apart at any instant is

Options:
A 18°

B 36Â°
C 54Â°
D 72Â°

The correct answer is:
72°

Solution:
From the given equation k=0.2π
⟹ 2πλ=0.2π
⟹ λ=10 mm
∆Φ=2πλ×∆x
=2π10×2=2π5=72°

Topic: Physics, Waves and Sound, NEET
The equation of a wave on a string of linear mass density 0.04 kgm-1 is given by y=0.02msinâ¡2Ït0.04s-x0.50m. The tension in the string is

Options:
A 4.0 N
B 12.5 N
C 0.25 N
D 6.25 N

The correct answer is:
6.25 N

Solution:
Wave speed of transverse wave in a stretched string
v=Tμ
T=μv2=μω2k2=0.042π0.0422π0.502=6.25N

Topic: Physics, Waves and Sound, NEET
The equation of a wave traveling on a string is y=4sin⁡π28t-x8. If x and y are in cm, then velocity of wave is

Options:
A 64 cm s-1 in -x direction
B 32 cm s-1 in -x direction
C 32 cm s-1 in +x direction
D 64 cm s-1 in +x direction

The correct answer is:
64 cm s-1 in +x direction

Solution:
The given equation can be written as
y=4sin⁡4πt-πx16
Wave velocity is given by
⇒ v=Coefficient of t ωCoefficient of x K
⇒ v=4ππ16=64 cm s-1 along +x direction.

Topic: Physics, Waves and Sound, NEET
The equation of Langmuir adsorption isotherm under high pressure is

Options:
A xm=ab
B xm=aP
C xm=1aP
D xm=ba

The correct answer is:
xm=ab

Solution:
x m = aP 1+bP
At high pressure
1+bP≈bP
So xm=aPbP=ab .

Topic: Chemistry, Surface Chemistry, NEET