datavorous/entrance-exam-dataset huggingface dataset:
Which one of the following equations of motion represents simple harmonic motion?

Options:
A Acceleration $=-\mathrm{k}_0 \mathrm{x}+\mathrm{k}_1 \mathrm{x}^2$
B Acceleration $=-\mathrm{k}(\mathrm{x}+\mathrm{a})$
C Acceleration $=\mathrm{k}(\mathrm{x}+\mathrm{a})$
D Acceleration $=\mathrm{kx}$ where $\mathrm{k}_1 \mathrm{k}_0, \mathrm{k}_1$ and are all positive.

The correct answer is:
Acceleration $=-\mathrm{k}(\mathrm{x}+\mathrm{a})$

Solution:
Key Idea Acceleration $\propto$ - (displacement).
$$
\begin{aligned}
& A \propto-y \\
& A=-\omega^2 y \\
& A=-\frac{k}{m} y \\
& A=-k y
\end{aligned}
$$
Here, $y=x+a$
$$
\therefore \text { acceleration }=-\mathrm{k}(\mathrm{x}+\mathrm{a})
$$

Topic: Physics, Oscillations, NEET, NEET 2009 (Screening)
Which one of the following esters gets hydrolyzed most easily under alkaline conditions?

Options:
A
B
C
D

The correct answer is:

Solution:
EWG (Electron withdrawing group) increases reactivity towards nucleophilic substitution reaction. -NO2 is strong electron withdrawing group.

Topic: Chemistry, Carboxylic Acid Derivatives, NEET, NEET 2015 (Phase 2)
Which one of the following expanded forms of the following acronyms is correct?

Options:
A UNEP - United Nations Environmental Policy
B EPA - Environmental Pollution Agency
C IUCN - International Union for Conservation of Nature and Natural Resources
D IPCC - International Panel for Climate Change

The correct answer is:
IUCN - International Union for Conservation of Nature and Natural Resources

Solution:
IUCN or IUCNNR (International Union for Conservation of Nature and Natural Resources) is now known as WCU (World Conservation Union). Its headquarters are at Morges, Switzerland. It studies the threat to biodiversity in all parts of the world by gathering information about the geographical distribution, population size and population changes of various taxa. It prepares a red list or red data book.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2011 (Screening)
Which one of the following expanded forms of the following acronyms is correct?

Options:
A IPCC= International Panel for Climate Change
B UNEP = United Nations Environmental Policy
C EPA = Environmental Pollution Agency
D IUCN = International Union Conservation of Nature and Natural Resources

The correct answer is:
IUCN = International Union Conservation of Nature and Natural Resources

Solution:
The Correct acronym is IUCN, International Union for Convservation of Natural resources.
IPCC - Intergovermental Panel on Climate Change
UNEP - United Nation Environmental Programme
EPA - Environmental Protection Agency

Topic: Biology, Biodiversity and its Conservation, NEET
Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?

Options:
A larvae could appear in decaying organic matter
B microbes did not appear in stored meat
C microbes appeared from unsterilized organic matter
D meat was not spoiled, when heated and kept sealed in a vessel.

The correct answer is:
meat was not spoiled, when heated and kept sealed in a vessel.

Solution:
The simplest living organisms could not have originated spontaneously from non-living matter. Microbes were killed by heating the meat and the sealed vessel formed a closed system wherein the new microbes could not come in contact with the nutrient medium and hence no spoilage of meat.
Related Theory
Pasteur performed experiments in which he took sterilized yeast and sugar solution in a long necked, then he bent the neck of the flask like a neck of swan. After one month he observed that no life appeared in flask solution because the curved flask neck acts as a filter. He later on broken down the neck and observed the solution. He found that many micro-organisms were originated in solution.

Topic: Biology, Evolution, NEET, NEET 2005
Which one of the following factors does not affect the Hardy-Weinberg law of genetic equilibrium?

Options:
A Natural selection
B Genetic drift
C Random mating
D Recombination

The correct answer is:
Random mating

Solution:
Five factors are known to affect Hardy-Weinberg law of genetic equilibrium. These are gene migration or gene flow, genetic drift, mutation, genetic recombination and natural selection.
It is not affected by random mating and large population.

Topic: Biology, Evolution, NEET
Which one of the following factors will not affect the Hardy-Weinberg equilibrium?

Options:
A Genetic drift
B Gene migration
C Constant gene pool
D Genetic recombination

The correct answer is:
Constant gene pool

Solution:
The correct answer is option (3) as a constant gene pool will not disturb the Hardy-Weinberg equilibrium. Option (1), (2) \& (4) will affect the equilibrium leading to evolution.

Topic: Biology, Evolution, NEET, NEET 2024
Which one of the following figures represents the placentation in Primrose?

Options:
A

B

C

D

The correct answer is:

Solution:
The figure given in option (b) represents the placetation (free central). In free central placentation, ovary is unilocular and ovules are borne on the axis in the center of the ovary and septa are absent. It is also seen Dianthus.

Topic: Biology, Morphology of Flowering Plants, NEET
Which one of the following fits the below description?

It is a single-celled organism that is a greenish colour and has a cell wall around its cell membrane. It has small infoldings of the cell membrane. It contains genetic material in the cytoplasm which is devoid of any envelope. It has ribosomes for protein synthesis.

Options:
A Type of an algae
B Type of bacteria
C Type of fungi
D Type of virus

The correct answer is:
Type of bacteria

Solution:
Since the DNA does not have any membranous covering, it is a prokaryotic cell. The small infoldings of the cell membrane are called mesosomes which are unique to prokaryotes. Thus, it will be a type of bacteria as all other options are eukaryotes.

Topic: Biology, Cell - The Unit of Life, NEET
Which one of the following floral formula represents the mustard plant?

Options:
A
B
C
D

The correct answer is:

Solution:
Flower formula of mustard plant is
Cruciferae (Mustard family) diagnostic characters:
1. Habit: Annual, biennial or perennial herbs.
2. Roots: Tap root (fibrous or tuberous)
3. Stem: Herbaceous.
4. Leaves: Petiolate, alternate, simple, exstipulate, reticulate venation; leaves are generally covered by simple or branched hairs.
5. Inflorescence: Simple racemose. It becomes corymbose raceme.
6. Flower: Pedicillate, ebracteate. actinomorphic, regular.
7. Complete, hermaphrodite, hypogynous.
8. Calyx: 4 sepals, free, dimerous (placed in two whorls) green
9. Corolla: 4 petals, free arranged in single whorl occupying the diagonal position and form characteristics cruciform form.
10. Stamens: 6 stamens, free, tetradynamous (two lateral stamens are smaller but four median stamens are larger) basifixed; nectaries are present at the base of stamens.
11. Carpel: 2 carpels, fused to form compound ovary: syncarpous. placentation parietal, ovary unilocular but become hilocular due to formation of false septum.
12. Fruits: Siliqua or silicula.
13. Seed: Non-endosperm

Topic: Biology, Morphology of Flowering Plants, NEET
Which one of the following forms micelles in aqueous solution above certain concentration?

Options:
A Dodecyl trimethyl ammonium chloride
B Glucose
C Urea
D Pyridinium chloride

The correct answer is:
Dodecyl trimethyl ammonium chloride

Solution:

Topic: Chemistry, Surface Chemistry, NEET
Which one of the following four glands is correctly matched with the accompanying description?

Options:
A Thyroid - Hyperactivity in young children cause cretinism
B Thymus - Starts undergoing atrophy after puberty
C Parathyroid - Secretes parathormone, which promotes movement of calcium ions from blood into bones during calcification
D Pancreas - Delta cells of islets of Langerhans secrete a hormone which stimulates glycolysis in liver

The correct answer is:
Thymus - Starts undergoing atrophy after puberty

Solution:
Thymus is an endocrine gland, which is active in young ones but gradually becomes inconspicuous after sexual maturity. Like other lymphoid tissues, thymus undergoes atrophy in response to adrenoglucocorticoids.

Topic: Biology, Chemical Coordination and Integration, NEET
Which one of the following fruits is parthenocarpic?

Options:
A Apple
B Jackfruit
C Banana
D Brinjal

The correct answer is:
Banana

Solution:
The formation of fruits without fertilization is called parthenocarpy. Such fruits are either seedless or non-viable seeds. When seedless fruits are produced without any special treatment from the ovaries in the absence of pollination and fertilization, the phenomenon is called natural parthenocarpy e.g., grapes, banana, pineapple.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2015 (Phase 2)
Which one of the following fungi contains hallucinogens?

Options:
A Morchella esculenta
B Amanita muscaria
C Neurospora sp.
D Ustilago sp

The correct answer is:
Amanita muscaria

Solution:
Amanita muscaria is a species of poisonous mushroom. It contains a psychoactive compound known as muscimol having hallucinogenic properties.

Morchella is edible fungi. Neurospora is used in genetics studies. Ustilago causes smut diseases in plants.

Topic: Biology, Biological Classification, NEET, NEET 2014
Which one of the following generates new genetic combinations leading to variation?

Options:
A Vegetative reproduction
B Parthenogenesis
C Sexual reproduction
D Nucellar polyembryony

The correct answer is:
Sexual reproduction

Solution:
Sexual reproduction generates new genetic recombination leading to variations. Advantages of sexual reproduction are more variation assists with survival. It increases the chance that at least some offspring of a parent survive.

Topic: Biology, Reproduction in Organisms, NEET, NEET 2016 (Phase 2)
Which one of the following gives imine formation with carbonyl compounds

Options:
A C6H5-NH-C6H5
B NH4Cl
C R3N
D C6H5NH2

The correct answer is:
C6H5NH2

Solution:
Only 1° -amine forms imine with carbonyl compound.

Topic: Chemistry, Aldehydes and Ketones, NEET
Which one of the following graphs between molar conductivity (Λm) versus C is correct?

Options:
A
B
C
D

The correct answer is:

Solution:
Both NaCl and KCl are strong electrolytes and as Na+ (aq) has less conductance than K+ (aq) due to more hydration of Na+ (g) due to small size and more hydration energy therefore the graph of option (B) is correct here.
Extent of hydration ∝1Λm

Topic: Chemistry, Electrochemistry, NEET
Which one of the following groups of animals are correctly matched with their two characteristic morphological features?

Options:
A Columba, Equus, and Balaenoptera - Dorsal hollow nerve cord and poikilothermous
B Pteropus, Pavo, Macropus, and Psittacula - 4 chambered heart and homeothermy
C Ascaris, Wuchereria and Pheretima - Pseudocoelomates and metamerism
D Dentalium, Octopus, Apis, and Bombyx - Open circulatory system and dorsal nerve cord

The correct answer is:
Pteropus, Pavo, Macropus, and Psittacula - 4 chambered heart and homeothermy

Solution:
4 chambered heart and homeothermy is seen in class Aves and Mammalia. Pteropus (Flying fox) and Macropus (Kangaroo) belongs to a class Mammalia, while Pavo (Peacock) and Psittacula (Parrot) belongs to a class Aves.

Topic: Biology, Animal Kingdom, NEET
Which one of the following groups of animals is bilaterally symmetrical and triploblastic?

Options:
A Coelenterates (cnidarians)
B Aschelminthes (roundworms)
C Ctenophores
D Sponges

The correct answer is:
Aschelminthes (roundworms)

Solution:
Aschelminthes are bilateral symmetrical and triploblastic animals, eg, Ascaris.
Coelenterates are radially symmetrical and diploblastic animals, eg, Obelia.
Ctenophores are biradial symmetrical and diploblastic animals, eg, Ctenoplana.
Sponges are asymetrical or radially symmetrical and diploblastic animals, eg, Sycon.

Topic: Biology, Animal Kingdom, NEET, NEET 2009 (Screening)
Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?

Options:
A Chordata- possess a mouth provided with an upper and a lower jaw
B Chondrichthyes - possess cartilaginous endoskeleton
C Mammalia- give birth to young ones
D Reptilia- possess 3-chambered heart with one incompletely divided ventricle

The correct answer is:
Chondrichthyes - possess cartilaginous endoskeleton

Solution:
The members of class-Chondrichthyes are marine animals with streamlined body and have cartilaginous endoskeleton.

Topic: Biology, Animal Kingdom, NEET, NEET 2011 (Screening)
Which one of the following groups of animals reproduces only by sexual means?

Options:
A Cnidaria
B Porifera
C Protozoa
D Ctenophora

The correct answer is:
Ctenophora

Solution:
In Ctenophores, asexual reproduction is absent. They are monoccious and fertilization is external. In cnidaria, asexual reproduction by budding is seen in polyp forms, and sexual reproduction in medusae forms. In protozoan, asexual reproduction occurs by fission, budding, etc. and sexual reproduction by conjugation and syngamy. In porifera ascxual reproduction occurs by gemmule formation.
Related Theory
Ctenophores are free-swimming. marine, solitary, pelagic animals with no polymorphism and no attached stages were found. They have a pair of long, solid, retractile tentacles and lack nematocysts. They have special adhesive and sensory cell i.e., colloblasts or lasso cells present in tentacles which helps in food capture. They are monoecious (hermaphrodite); gonads are endodermal situated on walls of digestive canals and development is direct with characteristic cydippid larva and lack asexual reproduction and alternation of generation. Regeneration and paedogenesis are common in them. Eg. Pleurobrachia, Hormiphora, Ctenoplana, Coeloplana.

Topic: Biology, Animal Kingdom, NEET, NEET 2013 (Karnataka)
Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?

Options:
A (a)
B (b)
C (c)
D (d)

The correct answer is:
(c)

Solution:

Topic: Biology, Animal Kingdom, NEET, NEET 2008 (Screening)
Which one of the following growth regulators is known as stress hormone?

Options:
A Abscisic acid
B Ethylene
C GA3
D Indole acetic acid

The correct answer is:
Abscisic acid

Solution:
Abscisic acid (ABA) is also known as the stress hormone, is produced during drought, water stress, and any other environmental stress conditions.
This hormone is a dextro-rotatory sesquiterpene-derivative and is synthesized from xanthophylls via the mevalonic acid pathway in the plants.
This hormone is a plant growth inhibitor. When the plant is in water stress, more amount of ABA is synthesized and secreted from the leaves. The transport of this hormone is via diffusion or even via conducting elements. It is an anti-transpirant as it closes the stomata.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2014
Which one of the following has an open circulatory system?

Options:
A octopus
B Pheretima
C Periplaneta
D Hirudinaria

The correct answer is:
Periplaneta

Solution:
The Periplaneta has an open circulatory system, which means that blood does not flow through blood vessels and instead flows through haemocoel (body cavity). All vertebrates and annelids (such as earthworms) and cephalopods (squids and octopus), have closed circulatory system.
Related Theory
In all vertebrate organisms, as well as some invertebrates, this is a closed-loop system in which the blood is not moving freely in a cavity. In a closed circulatory system, blood is contained inside blood vessels, circulating unidirectionally (in one direction) from the heart around the systemic circulatory route, then returning to the heart again. In contrast to a closed system, arthropods (including insects, crustaceans, and most mollusks) have an open circulatory system. In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel. The blood is called haemolymph because it mixes with the interstitial fluid.

Topic: Biology, Animal Kingdom, NEET, NEET 2006
Which one of the following has aromatic character?

Options:
A cyclopentadienyl cation
B cyclopentadienyl radical
C cyclopentadienyl anion
D cyclopentadiene

The correct answer is:
cyclopentadienyl anion

Solution:
In cyclopentadienyl anion, each carbon is sp2 -hybridized. The p-orbital or carbon carrying –ve charge has two electrons in the p-orbital. There is one electron in p-orbital of each of the other carbons. Overlapping of the p-orbitals occurs to form π -bonds. π -clouds above and below the plane of ring has a total of six electrons. Hence, it has aromatic nature in accordance with Huckel (4n + 2) π rule corresponding to n = 1.

Topic: Chemistry, General Organic Chemistry, NEET
Which one of the following has haplontic life cycle?

Options:
A Funaria
B Potytrichum
C Ustilago
D Wheat

The correct answer is:
Ustilago

Solution:
Ustilago has haplontic life cycle. In their sexual phase, only zygospore is diploid structure. All others are haploid, such a sexual cycle is termed as haploid or haplontic.

Topic: Biology, Plant Kingdom, NEET, NEET 2009 (Screening)
Which one of the following has its own DNA?

Options:
A Mitochondria
B Dictyosome
C Lysosome
D Peroxisome

The correct answer is:
Mitochondria

Solution:
In mitochondria, the inner membrane space is filled with a matrix which contains dense granules along with ribosomes and mitochondrial DNA. The mitochondrial DNA is circular in nature. There number varies from 2-6. Besides DNA, a mitochondrion has RNA and its ribosomes also. Thus, a complete protein synthesizing machinery is present in mitochondria, which suggests the semi-autonomous nature of mitochondria. Dictyosome, lysosome and peroxisome do not have their own DNA.

Topic: Biology, Cell - The Unit of Life, NEET, NEET 2010 (Screening)
Which one of the following has largest number of isomers?
(R = Alkyl group, en = Ethylenediamine)

Options:
A [PtCl2(CN)2]2-
B [ Ru ( NH 3 ) 5 Cl ] 2+
C [ Co ( NH 3 ) 5 Cl ] 2+
D [ Co ( en ) 2 Cl 2 ] +

The correct answer is:
[ Co ( en ) 2 Cl 2 ] +

Solution:
[PtCl2(CN)2]2- has two isomers while [ Co ( en ) 2 Cl 2 ] + shows geometrical as well as optical isomerism with total 3.

Topic: Chemistry, Coordination Compounds, NEET
Which one of the following has maximum boiling point?

Options:
A 0.2 M NaOH
B 0.2 M Na2CO3
C 0.1 M AgNO3
D 0.1 M (NH4)2SO4.FeSO4.6H2O

The correct answer is:
0.2 M Na2CO3

Solution:
ΔTb=Kb(im) .
The value of (im) is maximum for 0.2 M Na2CO3(i=3).
Hence, ΔTb is maximum for 0.2 M Na2CO3 . Consequently, 0.2 M Na2CO3 has maximum boiling point.

Topic: Chemistry, Solutions, NEET
Which one of the following has maximum genetic diversity in India?

Options:
A Teak
B Mango
C Wheat
D Tea

The correct answer is:
Mango

Solution:
In India, mango has the maximum genetic diversity.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2009 (Screening)
Which one of the following has maximum genetic diversity in India?

Options:
A Mango
B Rice
C Tea
D Teak

The correct answer is:
Rice

Solution:
Rice has more than 50,000 genetically different strains, while mango has 1000 varieties in India.

Topic: Biology, Biodiversity and its Conservation, NEET
Which one of the following has shortest carbon-carbon bond length here?

Options:
A C6H6
B C2H4
C C2H2
D C2H6

The correct answer is:
C2H2

Solution:
C2H2 has a triple covalent bond (≡) , which has shortest bond length.
Here C-C bond length order is
C2H6>C6H6>C2H4>C2H2

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which one of the following has strongest metallic bonding?

Options:
A Fe
B Sc
C V
D Cr

The correct answer is:
Cr

Solution:
Strength of metallic bond depends upon number of unpaired electrons. As number of unpaired electrons increase, the bond strength also increases. So, Cr, Mo, show stronger bonding due to maximum number of unpaired electrons.

Topic: Chemistry, d and f Block Elements, NEET
Which one of the following has the highest dipole moment between CH2Cl2,CHCl3and CCl4?

Options:
A CHCl3
B CCl4
C CH2Cl2
D None of the above

The correct answer is:
CH2Cl2

Solution:
Correct Option is : (C)
CH2Cl2

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which one of the following has the highest nucleophilicity?

Options:
A − OH
B − C H 3
C − N H 2
D F-

The correct answer is:
− C H 3

Solution:
Nucleophilicity decreases as we move from left to right in the period. This happens because as we move from left to right, the electronegative nature increases and as a result tendency to attack a positive charge decreases. Hence, the order of nucleophilicity is:
F<O<N<C
Hence, − C H 3 has highest nucleophilicity.

Topic: Chemistry, General Organic Chemistry, NEET
Which one of the following have the highest number of species in nature?

Options:
A Insects
B Birds
C Angiosperms
D Fungi

The correct answer is:
Insects

Solution:
More than 70 per cent of all the species recorded are animals. Among animals, insects are the most species rich taxonomic group, making more than 70 per cent of the total. It means out of every 10 aimals on this planet, 7 are insects.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2011 (Screening)
Which one of the following hormone stimulates the secretion of milk from the mother's breasts when the baby is sucking?

Options:
A Progesterone
B Oxytocin
C Prolactin
D Relaxin

The correct answer is:
Oxytocin

Solution:
Prolactin is a proteinaceous hormone released by anterior lobe of pituitary. Prolactin supplements the action of gonadal hormones in stimulating the growth and activity of female mammary gland during pregnancy and lactation. Oxytocin released by the posterior lobe of pituitary gland, is important for the mechanism of ejection of milk from the mammary glands due to sucking of breasts by infant. Progesterone, released by corpus luteum brings about pregnancy changes such as uterine growth, implantation of embryo etc. Relaxin is a proteinaceous hormone secreted by corpus luteum towards the end of gestation period for loosening and softening of pelvic ligaments, relaxing of uterus for easing parturition.

Topic: Biology, Chemical Coordination and Integration, NEET
Which one of the following hormones is a modified amino acid?

Options:
A Epinephrine
B Progesterone
C Prostaglandin
D Estrogen

The correct answer is:
Epinephrine

Solution:
On the basis of their chemical nature, hormones can be divided into groups:
(i) peptide, polypeptide, protein hormones (e.g., insulin, glucagon, pituitary hormones, hypothalamic hormones, etc.)
(ii) steroids (e.g., cortisol, testosterone, estradiol and progesterone)
(iii) iodothyronines (thyroid hormones)
(iv) amino-acid derivatives (e.g., epinephrine)

Topic: Biology, Chemical Coordination and Integration, NEET
Which one of the following hormones is modified amino acid?

Options:
A epinephrine
B progesterone
C prostaglandin
D estrogen.

The correct answer is:
epinephrine

Solution:
Epinephrine is an amino acid derived hormone while progesterone, prostaglandin and estrogen are steroidal hormone.
Related Theory
According to Chemical Nature, hormone are of 5 types:
(a) Steroid Hormones: e.g., Testosterone, Oestrogen, Progesterone etc.
(b) Amine Hormones: e.g., $T_y T_f$ epinephrine, norepinephrine.
(c) Peptide Hormones: e.g., Oxytocin and vasopressin both consist of only 9-amino acid residues only.
(d) Protein Hormones: e.g., Insulin, glucagon, STH etc.
(e) Glycoprotein Hormones: LH, FSH, TSH etc.
(f) Eicosanoids Hormones: (small fatty acid derivatives) e.g., Prostaglandins.

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2004
Which one of the following hormones is not found in plants?

Options:
A 2,4-D
B GA2
C Zeatin
D IAA

The correct answer is:
2,4-D

Solution:
2,4âD is the synthetic or exogenous auxin. 2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C8H6Cl2O3. It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but it leaves most grasses such as cereals, lawn turf and grassland relatively unaffected.

Topic: Biology, Plant - Growth and Development, NEET