datavorous/entrance-exam-dataset huggingface dataset:
Which secondary cell has a longer life than the lead storage cell but is more expensive to manufacture?

Options:
A Lithium-ion cell
B Alkaline cell
C Nickel-cadmium cell
D Zinc-carbon cell

The correct answer is:
Nickel-cadmium cell

Solution:
Nickel-cadmium cell has a longer life than the lead storage cell but is more expensive to manufacture.

Topic: Chemistry, Electrochemistry, NEET
Which secondary structure of proteins is characterized by peptide chains laid side by side and held together by hydrogen bonds?

Options:
A Alpha-helix
B Beta-pleated sheet
C Tertiary structure
D Quaternary structure

The correct answer is:
Beta-pleated sheet

Solution:
The beta-pleated sheet structure in proteins involves peptide chains stretched out and held together by intermolecular hydrogen bonds.

Topic: Chemistry, Biomolecules, NEET
Which set of characters belongs to the same phylum?

Options:
A First true coelomates and nephridia as the excretory structures.
B Pseudocoelomates and flame cells as the excretory structures.
C Acoelomates and metanephridia cells as the excretory structures.
D Eucoelomates and flame cells as the excretory structures.

The correct answer is:
First true coelomates and nephridia as the excretory structures.

Solution:
Annelida exhibit an organ-system level of body organization and bilateral symmetry. They are triploblastic, metamerically segmented, and coelomate animals. Their body surface is distinctly marked out into segments or metameres and, hence, the phylum name Annelida (Latin, annulus : little ring). They possess longitudinal and circular muscles that help in locomotion. Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming. A closed circulatory system is present. Nephridia (sing. nephridium) helps in osmoregulation and excretion. The neural system consists of paired ganglia (sing. ganglion) connected by lateral nerves to a double ventral nerve cord. Nereis, an aquatic form, is dioecious, but earthworms and leeches are monoecious. Reproduction is sexual.
Examples: Nereis, Pheretima (Earthworm), and Hirudinaria (Bloodsucking leech).

Topic: Biology, Animal Kingdom, NEET
Which simple tissue is characterized by pits?

Options:
A Collenchyma
B Parenchyma
C Sclerenchyma
D All of these

The correct answer is:
Sclerenchyma

Solution:
Pits are those region in where secondary wall material fails to get deposits, as a result a small gap is left. At the region of pit only primary wall is present. Pit makes secondary wall permeable. Secondary wall develops only in sclerenchyma, thus pits are present only in sclerenchyma.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which species is indicated as the strongest oxidizing agent based on its standard electrode potential?

Options:
A Hydrogen gas (H2)
B Fluorine gas (F2)
C Lithium-ion (Li+)
D Copper ion (Cu2+)

The correct answer is:
Fluorine gas (F2)

Solution:
Fluorine gas (F2) has the highest standard electrode potential, indicating that it is the strongest oxidizing agent.

Topic: Chemistry, Electrochemistry, NEET
Which statement best describes heterotrophic bacteria?

Options:
A Heterotrophic bacteria are the most abundant type of bacteria in nature.
B Heterotrophic bacteria are not important decomposers.
C Heterotrophic bacteria only exist in certain environments.
D Heterotrophic bacteria are the least abundant type of bacteria in nature.

The correct answer is:
Heterotrophic bacteria are the most abundant type of bacteria in nature.

Solution:
Heterotrophic bacteria are the most abundant in nature and that the majority of them are important decomposers.

Topic: Biology, Biological Classification, NEET
Which statement is correct regarding the Hinsberg test?

Options:
A Primary amines react with the Hinsberg reagent and yields N-ethylbenzenesulphonyl amide.
B Secondary amines react with the Hinsberg reagent and yields N,N-diethyl-benzenesulfonamide is formed
C Tertiary amines do not react with the Hinsberg reagent.
D All of these

The correct answer is:
All of these

Solution:
Benzenesulfonyl chloride reacts with primary amines to form sulphonamides and secondary amines yield N,N-dimethyl-benzenesulfonamide. Tertiary amines do not react.

Topic: Chemistry, Amines, NEET
Which statements about carbohydrates are CORRECT?

I. Inulin is a polymer of sucrose.

II. Glucose is a respiratory substrate and is also called fruit sugar.

III. Starch forms helical secondary structures in which it can hold I2 molecules.

IV. The variant of cellulose in animals is glycogen.

Options:
A I and II
B III and IV
C I, II and III
D I and IV

The correct answer is:
III and IV

Solution:
The biomolecules with carbon, oxygen and hydrogen atoms are known as carbohydrates. Depending on the composition, they can either be monosaccharide, disaccharide or polysaccharides. Sucrose is a disaccharide and can be broken down to glucose and fructose. Inuline is a polymer of fructose.
Glucose and fructose are monosaccharides, out of which fructose is also known as fruit sugar.
Starch forms helical secondary structures in which it can hold I2 molecules. The starch-I2 is blue in colour.
Cellulose is a homopolymer. Starch is a variant of this but present as a store house of energy in plant tissues. Animals have another variant called glycogen.

Topic: Chemistry, Biomolecules, NEET
Which statements about the human gas exchange system are correct?

I. The absence of cartilage in small bronchioles allows them to expand.
II. The walls of the alveoli are made of cuboidal epithelium.
III. The recoil of the elastic fibres surrounding the alveoli helps to move air out during expiration.
IV. The trachea and bronchi are supported by circles of cartilage.

Options:
A I and II
B I and III
C II and IV
D III and IV

The correct answer is:
I and III

Solution:
The tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings. Each terminal bronchiole gives rise to a number of very thin, irregular-walled, and vascularised bag-like structures called alveoli made of squamous epithelium. Alveolar walls contain elastic fibres which stretch during inspiration and recoil during expiration to help force out air. This elasticity allows alveoli to expand according to the volume of air breathed in.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which structure of the lungs is directly involved in O2/CO2 exchange between air and blood capillary?

Options:
A Bronchi
B Trachea
C Alveoli
D Secondary bronchi

The correct answer is:
Alveoli

Solution:
The alveoli represent the ultimate structural and physiological units of the lung. Alveoli provide a large surface area for gaseous exchange by diffusion. The alveolar wall is very thin, consisting of squamous epithelium and an extensive network of blood capillaries. Due to very intimate contact of blood capillaries with the alveoli, the exchange of gases takes place smoothly.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which substance is used as a standard solution for titration in the quantitative estimation of O3 gas?

Options:
A Sodium hydroxide
B Hydrochloric acid
C Sodium thiosulphate
D Borate buffer

The correct answer is:
Sodium thiosulphate

Solution:
In the quantitative estimation of O3 gas, iodine liberated when ozone reacts with an excess of potassium iodide solution buffered with a borate buffer is titrated against a standard solution of sodium thiosulphate. This method provides a quantitative estimation of ozone.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which term of a series $\frac{1}{4},-\frac{1}{2}, 1, \ldots .$ is $-128 ?$

Options:
A 9 th
B 10 th
C 1 th
D 12 th

The correct answer is:
10 th

Solution:
Let the given series be
$\frac{1}{4}, \frac{-1}{2}, 1, \ldots \ldots$
Let $\mathrm{a}=\frac{1}{4}$ and $\mathrm{r}=-\frac{1}{2} \times \frac{4}{1}=-2$
$\therefore \quad$ General term $=\mathrm{T}_{\mathrm{n}}=\mathrm{ar}^{\mathrm{D}-1}$
$\Rightarrow \quad-128=\frac{1}{4}(-2)^{n-1}$
$\Rightarrow \quad-512=(-2)^{\mathrm{n}-1}$
$\Rightarrow \quad(-2)^{9}=(-2)^{\mathrm{n}-1}$
$\Rightarrow \quad 9=\mathrm{n}-1 \Rightarrow \mathrm{n}=10$

Topic: Mathematics, Sequences and Series, NDA, NDA 2011 (Phase 1)
Which term of the sequence $20,19 \frac{1}{4}, 18 \frac{1}{2}, 17 \frac{3}{4}, \ldots$ is the first negative term?

Options:
A 27 th
B 28 th
C 29 th
D No such term exists

The correct answer is:
28 th

Solution:
Given sequence is $20,19 \frac{1}{4}, 18 \frac{1}{2}, 17 \frac{3}{4}, \ldots$
Which can be rewritten as $20, \frac{77}{4}, \frac{37}{2}, \frac{71}{4}, \ldots$
This is an AP series
Here, first term $\mathrm{a}=20$ and common difference $\mathrm{d}=-\frac{3}{4}$
$\mathrm{n}^{\text {th }} \operatorname{term}=\mathrm{a}+(\mathrm{n}-1) \mathrm{d}=20+(n-1)\left(-\frac{3}{4}\right)$
$=\frac{83}{4}-\frac{3}{4} n$
For first negative term, $n^{\text {th }}$ term $ < 0$
$\Rightarrow \frac{83}{4}-\frac{3}{4} n < 0 \Rightarrow 83 < 3 n$
$\Rightarrow n>\frac{83}{3}=27.66$
So, $\mathrm{n}$ should be 28 .
Hence, 28 th term is first negative term.

Topic: Mathematics, Sequences and Series, NDA, NDA 2009 (Phase 2)
Which type of alcohol can react with HCl without the need for a catalyst?

Options:
A Primary alcohols
B Secondary alcohols
C Tertiary alcohols
D All alcohols require a catalyst.

The correct answer is:
Tertiary alcohols

Solution:
Tertiary alcohols can react with concentrated HCl at room temperature without the need for a catalyst.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alcohol is most reactive as a nucleophile in nucleophilic substitution reactions?

Options:
A Primary alcohol
B Secondary alcohol
C Tertiary alcohol
D Aromatic alcohol

The correct answer is:
Tertiary alcohol

Solution:
Tertiary alcohols are typically more reactive as nucleophiles in nucleophilic substitution reactions due to reduced steric hindrance.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alcohol is the most challenging to dehydrate among primary, secondary, and tertiary alcohols?

Options:
A Primary alcohol
B Secondary alcohol
C Tertiary alcohol
D Aromatic alcohol

The correct answer is:
Primary alcohol

Solution:
Primary alcohols are the most challenging to dehydrate among primary, secondary, and tertiary alcohols.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alcohol reacts most readily with a given haloacid?

Options:
A Primary alcohols
B Secondary alcohols
C Tertiary alcohols
D All alcohols react equally.

The correct answer is:
Tertiary alcohols

Solution:
Tertiary alcohols are the most reactive among primary, secondary, and tertiary alcohols with a given haloacid.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alcohol undergoes dehydration when passed over heated copper?

Options:
A Primary alcohol
B Secondary alcohol
C Tertiary alcohol
D Aromatic alcohol

The correct answer is:
Tertiary alcohol

Solution:
Tertiary alcohols undergo dehydration when passed over heated copper.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alkyl group is suitable for the preparation of ethers via bimolecular dehydration?

Options:
A Primary
B Secondary
C Tertiary
D Quaternary

The correct answer is:
Primary

Solution:
Primary alkyl groups are suitable for the preparation of ethers via bimolecular dehydration.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alkyl groups are oxidized to carboxylic acids when using chromic acid or potassium permanganate?

Options:
A Primary and secondary alkyl groups
B Tertiary alkyl groups
C Alkynes
D Alkenes

The correct answer is:
Primary and secondary alkyl groups

Solution:
Chromic acid or potassium permanganate oxidation typically converts primary and secondary alkyl groups to carboxylic acids.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Which type of alkyl halide is preferred for the Williamson ether synthesis to obtain better results?

Options:
A Primary alkyl halides
B Secondary alkyl halides
C Tertiary alkyl halides
D Aromatic alkyl halides

The correct answer is:
Primary alkyl halides

Solution:
Primary alkyl halides are preferred in the Williamson ether synthesis to obtain better results. Secondary and tertiary alkyl halides tend to undergo elimination reactions instead of substitution reactions.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of alkyl halide reacts most rapidly in SN2 reactions?

Options:
A Methyl halides
B Primary halides
C Secondary halides
D Tertiary halides

The correct answer is:
Methyl halides

Solution:
Methyl halides react most rapidly in SN2 reactions because they have only three small hydrogen atoms and no bulky substituents hindering the nucleophile's approach.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which type of amine is obtained as the major product in ammonolysis when a large excess of ammonia is used?

Options:
A Primary amine
B Secondary amine
C Tertiary amine
D Quaternary ammonium salt

The correct answer is:
Primary amine

Solution:
When a large excess of ammonia is used in ammonolysis, the primary amine is obtained as the major product.

Topic: Chemistry, Amines, NEET
Which type of amines does not react with benzene sulfonyl chloride?

Options:
A Primary amines
B Secondary amines
C Tertiary amines
D All types of amines react with benzenesulfonyl chloride

The correct answer is:
Tertiary amines

Solution:
Tertiary amines do not react with benzenesulfonyl chloride.

Topic: Chemistry, Amines, NEET
Which type of amines reacts with benzenesulfonyl chloride to form sulphonamides?

Options:
A Primary amines
B Secondary amines
C Tertiary amines
D All types of amines

The correct answer is:
All types of amines

Solution:
Benzenesulfonyl chloride reacts with both primary and secondary amines to form sulphonamides. Tertiary amines do not react.

Topic: Chemistry, Amines, NEET
Which type of carbocation is the most stable among primary, secondary, and tertiary carbocations?

Options:
A Primary carbocation
B Secondary carbocation
C Tertiary carbocation
D Aromatic carbocation

The correct answer is:
Tertiary carbocation

Solution:
Tertiary carbocations are the most stable among primary, secondary, and tertiary carbocations.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which type of cells are designed to convert the energy of combustion of fuels into electrical energy?

Options:
A Secondary batteries
B Thermal cells
C Hydrogen cells
D Fuel cells

The correct answer is:
Fuel cells

Solution:
Galvanic cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy are called fuel cells.

Topic: Chemistry, Electrochemistry, NEET
Which type of immunoglobin is/are abundantly found in foetus?

Options:
A IgE
B IgG
C IgM
D IgD

The correct answer is:
IgG

Solution:
IgG is the most abundant antibody in foetus as it is the only one which can cross placental barrier from mother to reach child and provides immune protection to it.

Topic: Biology, Human Health and Diseases, JIPMER, JIPMER 2017
Which type of ligand can bind through two donor atoms?

Options:
A Hexadentate
B Unidentate
C Didendate
D Polydentate

The correct answer is:
Didendate

Solution:
Didendate ligands can bind to a metal ion through two donor atoms.

Topic: Chemistry, Coordination Compounds, NEET
Which type of RNA is most abundant in a cell?

Options:
A Messenger RNA (m-RN
A)
B Ribosomal RNA (r-RN
A)
C Transfer RNA (t-RN
A)
D Small nuclear RNA (sn-RN
A)

The correct answer is:
Ribosomal RNA (r-RN
A)

Solution:
Ribosomal RNA (r-RN

Topic: Chemistry, Biomolecules, NEET
Which type of secondary cell is commonly used in automobiles and inverters?

Options:
A Nickel-cadmium cell
B Lead storage battery
C Lithium-ion cell
D Alkaline cell

The correct answer is:
Lead storage battery

Solution:
The most important secondary cell commonly used in automobiles and inverters is the lead storage battery.

Topic: Chemistry, Electrochemistry, NEET
Which type of WBCs are the least abundant among the total WBCs in the human body?

Options:
A Neutrophils
B Monocytes
C Lymphocytes
D Basophils

The correct answer is:
Basophils

Solution:
Basophils are the least abundant cells among all the types of WBCs, constituting only 0.5-1% of the total WBCs. They are involved in secreting histamine, serotonin, heparin, etc., and are involved in inflammatory reactions.

Topic: Biology, Body Fluids and Circulation, NEET
Which type of WBCs is the most abundant among the total WBCs in the body?

Options:
A Neutrophils
B Basophils
C Eosinophils
D Lymphocytes

The correct answer is:
Neutrophils

Solution:
Neutrophils are the most abundant cells (60-65%) of the total WBCs.

Topic: Biology, Body Fluids and Circulation, NEET
While recording ECG, the electrical lead is not attached to the

Options:
A right wrist
B left wrist
C right ankle
D left ankle

The correct answer is:
right ankle

Solution:
ECG is Electrocardiogram that is a graph that represents the heart activity. This is recorded by a machine known as Electrocardiograph. This is recorded using six chest leads and three limb leads. This graph shows many peaks which are designated by alphabets P to T. The three limb leads are Left wrist, Right wrist and Left ankle. This is the standard placement of leads. Right ankle is grounded as it acts to remove extra currents and is not a part of ECG readings. The three leads form the Eithoven triangle (imaginary triangle).

Topic: Biology, Body Fluids and Circulation, NEET
Who developed the fundamental equation of quantum mechanics based on wave motion?

Options:
A Werner Heisenberg
B Erwin Schrödinger
C Louis de Broglie
D Max Planck

The correct answer is:
Erwin Schrödinger

Solution:
The fundamental equation of quantum mechanics based on wave motion was developed by Erwin Schrödinger.

Topic: Chemistry, Structure of Atom, NEET
Who observed that the behaviour of chromosomes at meiosis can serve as the cellular basis of both segregation and independent assortment?

Options:
A Sutton and Boveri
B Bateson and Boveri
C Sutton and Florey
D Boveri and Morgan

The correct answer is:
Sutton and Boveri

Solution:
The Boveri–Sutton chromosomal theory of inheritance is a fundamental unifying theory of genetics. It identifies chromosomes as the carriers of genetic material. It correctly explains the mechanism underlying the laws of Mendelian inheritance by identifying chromosomes with the paired factors (particles) required by Mendel's laws. It also states that chromosomes are linear structures with genes located at specific sites called loci along with them.
The theory states that chromosomes, which are seen in all dividing cells and pass from one generation to the next, are the basis for all genetic inheritance.
Sutton and Boveri observed that the behaviour of chromosomes at meiosis can serve as the cellular basis of both segregation and independent assortment.

Topic: Biology, Principles of Inheritance and Variation, NEET
Why are alloys used for making standard resistance coils?

Options:
A Because they are easy to manipulate and mold into desired shapes.
B Due to their high cost-effectiveness and widespread availability.
C Alloys have a low temperature co-efficient of resistance and high resistivity.
D Alloys provide better conductivity and are resistant to corrosion.

The correct answer is:
Alloys have a low temperature co-efficient of resistance and high resistivity.

Solution:
Correct Option is : (C)
Alloys have a low temperature co-efficient of resistance and high resistivity.

Topic: Chemistry, Current Electricity, NEET
Why are alloys used for making standard resistance coils?

Options:

None

Solution:
Alloy has less value of temperature coefficient of resistance with less temperature sensitivity.
So, the resistance of the wire almost constant even in small temperature change. The alloys also has high resistivity $\left(\mathrm{R}=\rho \frac{l}{\mathrm{~A}}\right)$.
Hence high resistance, because for given length and crosssection area of conductor ( $l$ and A are constant). Due to this reason alloys are used to make standard resistance coils.

Topic: Physics, Current Electricity
Why are lithium salts often found in hydrated forms, such as LiCl· 2H2O?

Options:
A Lithium has a high melting point.
B Lithium has a strong tendency to form hydrates.
C Lithium is highly soluble in water.
D Lithium is found in abundance in nature.

The correct answer is:
Lithium has a strong tendency to form hydrates.

Solution:
Lithium ions (Li+) have a strong affinity for water molecules and readily form hydrates when in contact with water. This is why lithium salts are often found in hydrated forms, such as LiCl· 2H2O.

Topic: Chemistry, s Block Elements, NEET
Why are naturally occurring amino acids referred to as "α-amino acids"?

Options:
A Because they have an α-carbon atom
B Because they have an α-helix structure
C Because they have an α-tertiary structure
D Because they have an α-secondary structure

The correct answer is:
Because they have an α-carbon atom

Solution:
The term "α-amino acids" is used because they have an α-carbon atom.

Topic: Chemistry, Biomolecules, NEET
Why are vascular bundles closed in monocots?

Options:
A Xylem and phloem are present.
B Xylem and phloem occur in separate bundles.
C Vascular cambium is present between xylem and phloem.
D Vascular cambium is not present.

The correct answer is:
Vascular cambium is not present.

Solution:
The vascular system consists of complex tissues, the phloem and the xylem. The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues, and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues so they are referred to as closed.

Topic: Biology, Anatomy of Flowering Plants, AIIMS, AIIMS 2010
Why are vascular bundles in dicotyledonous stems referred to as open?

Options:
A Because they possess the ability to form secondary xylem and phloem tissues
B Because they have no cambium present in them
C Because they are jointly situated along the same radius of vascular bundles
D Because they are arranged in an alternate manner along the different radii

The correct answer is:
Because they possess the ability to form secondary xylem and phloem tissues

Solution:
In dicotyledonous stems, cambium is present between phloem and xylem, and hence such vascular bundles possess the ability to form secondary xylem and phloem tissues, and are referred to as open.

Topic: Biology, Anatomy of Flowering Plants, NEET
Why are vitamins considered essential food factors for humans?

Options:
A They provide energy.
B They are synthesized by the human body.
C They are abundant in animal-based foods.
D Humans cannot synthesize most vitamins and must obtain them from their diet.

The correct answer is:
Humans cannot synthesize most vitamins and must obtain them from their diet.

Solution:
Vitamins are considered essential because most of them cannot be synthesized by the human body and must be obtained from the diet.

Topic: Chemistry, Biomolecules, NEET
Why do primary amines undergo the carbylamine reaction, while secondary and tertiary amines do not?

Options:
A Primary amines have more hydrogen atoms.
B Secondary and tertiary amines are less reactive.
C Primary amines have an available lone pair of electrons.
D Secondary and tertiary amines react with chloroform to form stable compounds.

The correct answer is:
Primary amines have an available lone pair of electrons.

Solution:
Primary amines have an available lone pair of electrons on the nitrogen atom, which can react with chloroform to form isocyanides.

Topic: Chemistry, Amines, NEET
Why do secondary and tertiary amines not react with nitrous acid in the same way as primary amines?

Options:
A They lack a nitrogen atom
B They lack a lone pair of electrons on nitrogen
C They are less stable
D They have a higher boiling point

The correct answer is:
They lack a lone pair of electrons on nitrogen

Solution:
Secondary and tertiary amines lack a lone pair of electrons on the nitrogen atom, which is necessary for the reaction with nitrous acid.

Topic: Chemistry, Amines, NEET