datavorous/entrance-exam-dataset huggingface dataset:
Surface of certain metal is first illuminated with light of wavelength Î»1=350 nm and then, by a light of wavelength Î»2=540 nm. It is found that the maximum speed of the photoelectrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to
(Energy of photon =1240Î»in nm eV )

Options:
A 2.5
B 1.8
C 5.6
D 1.4

The correct answer is:
1.8

Solution:
Î»1=350 nm,ââÎ»2=540ânm, V1V2=2âV1=2V and V2=V
hcÎ»1=Ï+12m2V2
hcÎ»2=Ï+12mV2
hcÎ»1-4hcÎ»2=Ï-4Ï
hc4540-1340=3Ï
Ï=1.8 eV

Topic: Physics, Dual Nature of Matter, NEET
Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with an increase in temperature and vanishes at boiling point. Given that the latent heat of vaporisation for water (Lv) = 540 k cal kg–1, the mechanical equivalent of heat (J) = 4.2 J cal–1, density of water (ρw) = 103 kg l–1, Avogadro’s Number (NA) = 6.0 × 1026k mole–1, and the molecular weight of water (MA) = 18 kg for 1 k mole. Calculate F/d, which is a measure of the surface tension.

Options:
A 6.6×10-2Nm
B 3.3×10-2Nm
C 3.3×10-3Nm
D 6.6×10-3Nm

The correct answer is:
6.6×10-2Nm

Solution:
Correct Option is : (A)
6.6×10-2Nm

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with an increase in temperature and vanishes at boiling point. Given that the latent heat of vaporisation for water (Lv) = 540 k cal kg–1, the mechanical equivalent of heat (J) = 4.2 J cal–1, density of water (ρw) = 103 kg l–1, Avogadro’s Number (NA) = 6.0 × 1026k mole–1, and the molecular weight of water (MA) = 18 kg for 1 k mole.During vaporisation a molecule overcomes a force F, assumed constant, to go from an inter-molecular distance d to d′. Estimate the value of F.

Options:
A 0.2048 × 10-11N
B 0.1024 × 10-10N
C 0.1024 × 10-11N
D 0.2048 × 10-10N

The correct answer is:
0.2048 × 10-10N

Solution:
Correct Option is : (D)
0.2048 × 10-10N

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Surface tension is exhibited by liquids due to force of attraction between molecules of the liquid. The surface tension decreases with an increase in temperature and vanishes at boiling point. Given that the latent heat of vaporisation for water (Lv) = 540 k cal kg–1, the mechanical equivalent of heat (J) = 4.2 J cal–1, density of water (ρw) = 103 kg l–1, Avogadro’s Number (NA) = 6.0 × 1026k mole–1, and the molecular weight of water (MA) = 18 kg for 1 k mole, what is the estimated intermolecular distance at boiling point, in the vapor state?

Options:
A 24.3 × 10–10m
B 30.5 × 10–10m
C 36.3 × 10–10m
D 42.1 × 10–10m

The correct answer is:
36.3 × 10–10m

Solution:
Correct Option is : (C)
36.3 × 10–10m

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Surgical removal of testes is known as

Options:
A Vasectomy
B Oopharectomy
C Castration
D Hysterectomy

The correct answer is:
Castration

Solution:
Permanent method of birth control in which either testis are surgically removed is called castration.

Topic: Biology, Reproductive Health, NEET
Suspension of the attenuated pathogen that stimulates antibody formation is

Options:
A antitoxin
B vaccine
C antibiotic
D serum

The correct answer is:
vaccine

Solution:
The vaccine is defined as a substance (suspension) that is injected into the body to prevent or fight against disease. This suspension consists of a weakened or killed form of the disease-causing organism. The vaccine stimulates the immune system to attack the agent. Once the vaccine is injected, anti-body producing cells are activated and are prepared to fight the agent if it attacks again.

Topic: Biology, Human Health and Diseases, NEET
Sutures are made up of:

Options:
A Yellow elastic connective tissue.
B Dense fibrous connective tissue.
C Calcified cartilage.
D White fibrocartilage.

The correct answer is:
Dense fibrous connective tissue.

Solution:
Fibrous joints do not allow any movement. This type of joint is shown by the flat skull bones which fuse end-to-end with the help of dense fibrous connective tissues in the form of sutures, to form the cranium.

Topic: Biology, Locomotion and Movement, NEET
Sweet potato is a modified

Options:
A Tap root
B Adventitious root
C Stem
D Rhizome

The correct answer is:
Adventitious root

Solution:
The sweet potato root system consists of fibrous roots - that absorb nutrients and water and anchor the plant and storage roots - which are lateral roots that store photosynthetic products.

The root system of sweet potato plants obtained by vegetative propagation starts with adventitious roots that develop into primary fibrous roots which branch into lateral roots. As the plant matures, thick pencil roots that become lignified are produced. Other roots without lignin, are fleshy and bulky and are called storage roots. Such roots are specialized to store food and get swollen in the process.

Plants are grown from true seed form a typical root system with a central axle with lateral branches. Later on, the central axle functions as a storage root.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2018
Sweet potato is homologous to:

Options:
A Potato
B Colocasia
C Ginger
D Maize

The correct answer is:
Maize

Solution:
Sweet potato is homologous to maize as both are having same origin i.e., both are root but modified for different functions. Sweet potato is modified root for storage and vegetative propagation while in maize the roots are modified for support.

Topic: Biology, Morphology of Flowering Plants, NEET
Sweet potato shows homology to

Options:
A Potato
B Colocasia
C Ginger
D Maize

The correct answer is:
Maize

Solution:
Potato is a tuber that is an underground modification of stem. Ginger is a rhizome that is also an underground modification of stem. Colocasia is a corm that is also an underground modification of stem. Maize has a stilt root that is an adventitious root modified for support. Sweet potato is an adventitious root modified for the storage of food.

Topic: Biology, Evolution, NEET
Swiss cheese is ripened by

Options:
A Propionibacterium shermanii
B Penicillium roqueforti
C Penicillium camemberti
D Streptococcus lactis

The correct answer is:
Propionibacterium shermanii

Solution:
Swiss cheese is characterized by large holes formed due to the amount of CO2 released by Propionibacterium shermanii, Penicillium roqueforti is involved in ripening of the Roquefort cheese. Camembert cheese is ripened by Penicillium camemberti.

Topic: Biology, Microbes in Human Welfare, NEET
Swollen placenta with many ovules is present in

Options:
A Chilli
B Aloe
C Tulip
D Mullathi

The correct answer is:
Chilli

Solution:
Swollen placenta with oblique ovary is characteristics of Solanaceae family. Many ovules are organized in axile placentation on bilocular ovary. Chili is member of Solanaceae family. Aloe vera and Tulip are member of Liliaceae family and Mulatthi is member of Fabaceaae family.
(Hint; Swollen placenta with many ovule is present in axile placentation is feature of Solanaceae family.

Topic: Biology, Morphology of Flowering Plants, NEET
Sycon belongs to a group of animals, which are best described as:

Options:
A unicellular or acellular
B multicellular without any tissue organization
C multicellular with a gastrovascular system
D multicellular having tissue organization, but no body cavity

The correct answer is:
multicellular without any tissue organization

Solution:
Cellular level of organization (loose mass of cells) - phylum Porifera tissue levels of organization - Phylum coelenterate organ level of organization - Phylum Platyhelminthes and Aschelminthes organ-system level of organisation - Annelids, Arthropods, Molluscs, Echinoderms, and Chordates

Topic: Biology, Animal Kingdom, NEET, NEET 2003
Sycon belongs to a group of animals, which are best described as

Options:
A Unicellular or acellular organisms
B Multicellular organisms without any tissue organization
C Multicellular organisms with a gastrovascular system
D Multicellular organisms having tissue organization, but no body cavity

The correct answer is:
Multicellular organisms without any tissue organization

Solution:
Sycon, belonging to the phylum porifera, are multicellular organisms with cellular level of body organisation. The constituent cells perform their functions more or less independently. No distinct tissue or organs are present in it.

Topic: Biology, Animal Kingdom, NEET
Symbol for deca is

Options:
A d
B da
C de
D None of above

The correct answer is:
d

Solution:
Correct Option is : 1
d

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Symbol for SI unit of thermodynamic Temperature is

Options:
A T
B K
C both A and B
D none

The correct answer is:
K

Solution:
Correct Option is : 2
K

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Symbolic representation of four logic gates are shown as
Pick out which ones are for AND, NAND and NOT gates, respectively.

Options:
A (iii), (ii) and (i)
B (iii), (ii) and (iv)
C (ii), (iv) and (iii)
D (ii), (iii) and (iv)

The correct answer is:
(ii), (iv) and (iii)

Solution:
In symbols given in problem are
(i) OR gate
(ii) AND gate
(iii) NOT gate and
(iv) NAND gate

Topic: Physics, Semiconductors, NEET, NEET 2011 (Screening)
Symptoms of an allergy can be readily reduced by the use of all, except

Options:
A histamine
B cortisol
C adrenaline
D anti-histamine

The correct answer is:
histamine

Solution:
Histamine is a chemical that is produced by the immune system to cause symptoms of allergy and does not reduce it. This is because when a person is allergic to a particular food substance or dust etc, the immune system sees them as a threat and in an attempt to protect it prompts the body cells to release histamine and other chemicals into the bloodstream. The histamine then acts on various organs such as eyes, nose, lungs, throat, skin etc.

Topic: Biology, Human Health and Diseases, NEET
Synapsids evolved around

Options:
A 350 mya
B 300 mya
C 250 mya
D 200 mya

The correct answer is:
300 mya

Solution:
Synapsids evolved around 300 mya and include therapsids, which were mammal-like reptiles from which mammals evolved.

Topic: Biology, Evolution, NEET
Synapsis occurs between

Options:
A a male and a female gamete
B mRNA and ribosomes
C spindle fibres and centromere
D two homologous chromosomes

The correct answer is:
two homologous chromosomes

Solution:
In zygotene of prophase-I, homologous chromosomes pair up. This process is called synapsis. One chromosome of the pair is from the male parent and one from the female parent.

Topic: Biology, Cell Cycle and Cell Division, NEET, NEET 2009 (Screening)
Synaptonemal complex is formed during

Options:
A Pachytene
B Zygotene
C Leptotene
D Diplotene

The correct answer is:
Zygotene

Solution:
During zygotene, chromosomes start pairing together and this process of association is called synapsis. Such paired chromosomes are called homologous chromosomes. Electron micrographs of this stage indicate that chromosome synapsis is accompanied by the formation of a complex structure called the synaptonemal complex. It forms the structural basis for pairing and synapsis of meiotic chromosomes.

Topic: Biology, Cell Cycle and Cell Division, NEET
Synaptonemal complex is visible from

Options:
A Diplotene to Diakinesis
B Leptotene to Zygotene
C Zygotene to Pachytene
D Metaphase to Telophase

The correct answer is:
Zygotene to Pachytene

Solution:
During zygotene of prophase-I chromosomes start pairing together and this process of association is called synapsis. Such paired chromosomes are called homologous chromosomes. Electron micrographs of this stage indicate that chromosome synapsis is accompanied by the formation of complex structure called synaptonemal complex. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad. However, these are more clearly visible at the next stage i.e. Pachytene.

Topic: Biology, Cell Cycle and Cell Division, NEET
Syncytium condition can be observed in

Options:
A liquid endosperm of coconut
B solid endosperm of coconut
C Both liquid as well as solid endosperm of coconut
D embryo of coconut

The correct answer is:
liquid endosperm of coconut

Solution:
Syncytium is a multinucleate cell condition formed by multiple fusion of uninucleate cells. In the coconut fruit, the endosperm which is liquid in its early development undergoes repeated nuclei division before undergoing cytokinesis. The endosperm provides nutrition to the developing embryo. During early development of liquid endosperm in coconut fruits, nuclei divide repeatedly before cytokinesis sets in. In this, karyokinesis is not followed by cytokinesis. It is commonly called as liquid endosperm. Milky water in coconut is the liquid endosperm present in it. Its function is to provide nourishment for the developing embryo. The liquid endosperm shows syncytial stages.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Syngamy can occur outside the body of the organism in:

Options:
A mosses
B algae
C ferns
D fungi

The correct answer is:
algae

Solution:
In algae, syngamy (fertilization) is external, while mosses, ferns and fungi produces spores formed on parent body and germinate in suitable environment.

Topic: Biology, Plant Kingdom, NEET, NEET 2013 (Karnataka)
Syngamy can occur outside the body of the organism in:

Options:
A Mosses
B Algae
C Ferns
D Conifers

The correct answer is:
Algae

Solution:
Fusion of male and female gamete is called as syngamy. External fertilization is present in lower plants and occurs in water. It occurs in Algae where both male and female gametes are released in water where they come in contact and undergoes syngamy.

Topic: Biology, Plant Kingdom, NEET
Syngenesious condition is found in

Options:
A Asteraceae
B Labiate
C Solanaceae
D Fabaceae

The correct answer is:
Asteraceae

Solution:
When stamens are united by their anthers and filaments are free the condition is called syngenesious. It is found in family Asteraceae (Compositae). The condition is an adaptation for entomophily.

Topic: Biology, Morphology of Flowering Plants, NEET
Synthesis of mRNA is:

Options:
A Transcription
B Translation
C Translocation
D Transduction

The correct answer is:
Transcription

Solution:
Transcription is the process of the formation of RNA from DNA template.

Topic: Biology, Molecular Basis of Inheritance, NEET
Synthetic detergents have an advantage over usual soaps as far as cleansing power is concerned. But use of synthetic detergents over a long time creates environmental pollution. How can the pollution caused by synthetic detergents be minimized?

Options:
A Reducing the concentration of synthetic detergents in cleaning products.
B The branching of the hydrocarbon chain is controlled and kept to the minimum.Unbranched chains can be biodegraded more easily and hence pollution is prevented.
C Increasing the use of synthetic detergents to enhance cleaning efficiency.
D Encouraging the disposal of synthetic detergents in landfills.

The correct answer is:
The branching of the hydrocarbon chain is controlled and kept to the minimum.Unbranched chains can be biodegraded more easily and hence pollution is prevented.

Solution:
Correct Option is : (B)
The branching of the hydrocarbon chain is controlled and kept to the minimum.Unbranched chains can be biodegraded more easily and hence pollution is prevented.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Synthetic fibres have very strong forces because

Options:
A They have high molecular weights and high melting points
B They have a high degree of cross-linking by strong C-C bond
C They have linear molecules consisting of very long chains
D They have linear molecules interlinked with forces like hydrogen bonding

The correct answer is:
They have linear molecules interlinked with forces like hydrogen bonding

Solution:
They have linear molecules interlinked with forces like hydrogen bonding.

Topic: Chemistry, Polymers, NEET
Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made?

Options:
A By incorporating natural, biodegradable materials into the polymer matrix.
B By using non-renewable resources as feedstock.
C By increasing the polymer's chemical stability.
D By minimizing the exposure of synthetic polymers to environmental factors.

The correct answer is:
By incorporating natural, biodegradable materials into the polymer matrix.

Solution:
Correct Option is : (A)
By incorporating natural, biodegradable materials into the polymer matrix.

Topic: Chemistry, Polymers, NEET
Systematics involves

Options:
A identification of organisms
B nomenclature of organisms
C relationships and classification of organisms
D All of the above

The correct answer is:
All of the above

Solution:
The study of the historical relationship of groups of biological organisms is called systematics or it is a branch of science that deals with classification or nomenclature. It is a Latin word in which organisms are arranged in a systematic manner. It deals with the population, species, and higher taxa. So the correct answer is D.

Topic: Biology, The Living World, NEET
Systemic heart refers to:

Options:
A the heart that contracts under stimulation from nervous system
B left auricle and left ventricle in higher vertebrates
C entire heart in lower vertebrates
D the two ventricles together in humans

The correct answer is:
left auricle and left ventricle in higher vertebrates

Solution:
Systemic circulation moves blood between the heart and the rest of the body. It sends oxygenated blood out to cells and returns deoxygenated blood to the heart. Systemic heart refers to the left auricle and left ventricle in higher vertebrates. In Pulmonary circulation, deoxygenated blood pumped into the pulmonary artery is transferred to the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.
Related Theory
Systemic circulation is ordered from the left ventricle to the aorta, through the structures of the body, to the superior or inferior vena cava, and re-enters the heart in the right atrium. The pulmonary circulation is a relatively low pressure system compared to the systemic circulation because the pulmonary arteries are not as muscularized as their systemic counterparts.

Topic: Biology, Body Fluids and Circulation, NEET, NEET 2003
Systemic heart refers to

Options:
A The heart that contracts under stimulation from nervous system
B Left auricle and left ventricle in higher vertebrates
C Entire heart in lower vertebrates
D Both the ventricles of human heart

The correct answer is:
Left auricle and left ventricle in higher vertebrates

Solution:
The systemic heart receives oxygenated blood from the lungs and then pumps this blood to other parts of the body.

Topic: Biology, Body Fluids and Circulation, NEET
Systolic blood pressure of a patient was 140 mm Hg while his diastolic blood pressure is 90 mm Hg. If this is not controlled, it can lead to

a Heart disease

b Brain haemorrhage

c Damage of the blood vessels of kidney

d Failure in conducting system

Options:
A a,Â b,Â c and d
B a, b and c
C Only a and b
D b and c only

The correct answer is:
a, b and c

Solution:
Blood pressure is the lateral force exerted by the volume of blood on the walls of the blood vessels. The blood pressure is high in the arterial circulation than venous. Normal ideal blood pressure in humans is 120/80 mmHg. When this pressure increases it signifies that the force exerted on the vessel walls is higher than usual and also the heart is pumping blood with much higher force than normal. This abnormal pressure if continued for a long duration will eventually lead to damage to the layers of the arterial walls which lose their elastic property and become hardened, the blood vessels of the kidney (Renal artery) being the most commonly affected. Also, high pressure can lead to the rupture of delicate vessels in the brain leading to brain hemorrhage. This continuous overwork of pumping blood with more pressure will lead to diseases of the heart too. The conducting system is not dependent on the circulation but instead dependent on the electrical circuit of the heart which is not affected by the raised blood pressure.

Topic: Biology, Body Fluids and Circulation, NEET
TψC loop of tRNA is called:

Options:
A 'Most specific' part of tRNA
B Enzyme attachment site
C Ribosomal attachment site
D Aminoacyl attachment site

The correct answer is:
Ribosomal attachment site

Solution:
tRNA is a type of RNA molecule that helps in translating mRNA codons to polypeptide by joining the amino acids. tRNA contains a definitive structure with three hairpin loops. One of the loop has a set of anticodon triplet complementary to the codon on mRNA. It also has a T-arm or T-loop which is used for attachment to the ribosome during the protein bio-synthesis. This loop is also called as TψC as it contains thymidine, cytidine and pseudouridine.

Topic: Biology, Molecular Basis of Inheritance, NEET
TiI4 on heating gives

Options:
A TiI2+I2
B Ti+2I2
C TiI3+12I2
D None of these

The correct answer is:
Ti+2I2

Solution:
TiI4 on heating gives titanium and iodine. It is the van Arkel method for the production of pure Ti.
TiI4 →Heat Ti+2I2

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
TiO2 is well known example of

Options:
A triclinic system
B tetragonal system
C Monoclinic system
D None of these

The correct answer is:
tetragonal system

Solution:
TiO2 has tetragonal system with five plane of symmetry and five axes of symmetry.

Topic: Chemistry, Solid State, NEET
T. W. Engelmann performed his experiments on which of the following?

Options:
A Cladophora - a green algae.
B Cladophora - an aerobic bacteria.
C Chlorobium - a green algae.
D Chlorobium - an aerobic bacteria.

The correct answer is:
Cladophora - a green algae.

Solution:
Engelmann experimented on Cladophora, he illuminated Cladophora with white light after passing through prism. He used aerobic bacteria to detect oxygen evolution site, and observed that maximum bacteria accumulated in blue and red region of the spectrum, indicating that maximum photosynthesis occurs in this region.

Topic: Biology, Photosynthesis in Higher Plants, NEET
'T' wave in an ECG represents

Options:
A Atrial repolarization
B Atrial depolarization
C Ventricular repolarization
D Ventricular depolarization

The correct answer is:
Ventricular repolarization

Solution:
Various waves are observed in a normal ECG:
I. P-wave: It represents the electrical excitation (or depolarization) of the atria, which leads to the contraction of both the atria (atrial systole).
II. QRS complex: It represents the depolarization of the ventricles initiating the ventricular contraction. The starting of ventricular contraction (or beginning of the systole) starts shortly after Q.
III. T-wave: It represents a phase in which the ventricles return from excited to a normal state (repolarisation). The end of the T-wave marks the end of ventricular systole.

Topic: Biology, Body Fluids and Circulation, NEET
Table sugar is

Options:
A A disaccharide consisting of D-glucose and D-fructose
B a monosaccharide
C a disaccharide of D-glucose
D D-glucose

The correct answer is:
A disaccharide consisting of D-glucose and D-fructose

Solution:
Sucroseis common sugar. It is a disaccharide, a molecule composed of two monosaccharides: glucose and fructose.Sucrose is produced naturally in plants, from which table sugar is refined. It has the molecular formula C12H22O11 .

Topic: Chemistry, Biomolecules, NEET