datavorous/entrance-exam-dataset huggingface dataset:
The compressibility factor for a real gas at high pressure is

Options:
A 1
B 1 + pb RT
C 1 - pb RT
D 1 + RT pb

The correct answer is:
1 + pb RT

Solution:
van der Waal's equation for one mole of a real gas is
p + a V 2 V - b = RT
At high pressures, volume of gas being low and thus aVm2 can be neglected. Thus, p V - b = RT
pV = RT + pb
or pV RT = 1 + pb RT
â´ Compressibility factor
Z = pV RT = 1 + pb RT

Topic: Chemistry, States of Matter, NEET
The compressibility factor of a gas is less than unity at STP. Therefore

Options:
A Vm > 22.4 litres
B Vm < 22.4 litres
C Vm = 22.4 litres
D Vm = 44.8 litres

The correct answer is:
Vm < 22.4 litres

Solution:
Z=PV/nRT
Given Z < 1
PV/nRT<1 or PV<nRT
(1atm)ÃV<1molÃ(0.0821LatmK-1mol-1)Ã(273K)
V m <0.0821×273L
V m <22.4L

Topic: Chemistry, States of Matter, NEET
The compressibility of a gas is less than unity at STP therefore

Options:
A Vm>22.4 litre
B Vm<22.4 litre
C Vm=22.4 litre
D Vm=44.8 litre

The correct answer is:
Vm<22.4 litre

Solution:
The compressibility factor (Z) =P×22.4RT=1 (for ideal gas)
(Z)=P×VmRT<1 (for real gas)
So 22.4Vm>1
or Vm<22.4

Topic: Chemistry, States of Matter, NEET
The concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolysed. Which of the following hydrocarbon(s) is/are produced?

Options:
A CH3CH3 only
B CH3CH2CH3 only
C CH3CH3 and CH3CH2CH2CH3
D CH3CH2CH2CH3 and CH3CH2CH3

The correct answer is:
CH3CH3 and CH3CH2CH2CH3

Solution:
When concentrated aqueous solution of potassium salts of acetic acid and propanoic acid are electrolysed. CH3CH3 and CH3CH2CH2CH3 are produced as follows
CH3COOK(aq)→CH3COO-(aq)+K+(aq)
CH3CH2COOK(aq)→CH3CH2COO-(aq)+K+(aq)
Anode: A. 2CH3COO-(aq)→CH3-CH3+2CO2+2e-
B. 2CH3CH2COO-(aq)→CH3CH2CH2CH3+2CO2+2e-
Cathode: 2HOH+2e-→H2(g)+2OH-

Topic: Chemistry, Hydrocarbons, NEET
The concentration of essential element below which plant growth is retarded is termed as:

Options:
A Toxic concentration
B Super-optimum concentration
C Critical concentration
D Optimum concentration

The correct answer is:
Critical concentration

Solution:
A chemical nutrient that is necessary for plant growth and development is known as essential elements and they are 17 in number. Due to deficiency of it plants become unable to complete their life cycle. Critical concentration is the minimum concentration of mineral below that the plant growth will get retarded or stunted. If the concentration of the essential elements rises above the critical concentration then that leads to toxicity or the death of the plants.

Topic: Biology, Mineral Nutrition, NEET
The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10-3M. What is its pH?

Options:
A pH = 3.8
B pH = 5.2
C pH = 2.42
D pH = 10.2

The correct answer is:
pH = 2.42

Solution:
Correct Option is : (C)
pH = 2.42

Topic: Chemistry, Ionic Equilibrium, NEET
The concentration of hydrogen ion in a sample of soft drink is 3.8 x 10-3M. What is its pH?

Options:
A 2.5
B 2.42
C 3.4
D 4.2

The correct answer is:
2.42

Solution:
Correct Option is : (B)
2.42

Topic: Chemistry, Ionic Equilibrium, NEET
The concentration of iron, lead, nitrate and fluoride in a water sample from an underground lake was found to be 0.18 ppm, 35 ppb, 80 ppm and 1000 ppb, respectively. This water is unsuitable for drinking due to high concentration of

Options:
A Lead
B Nitrate
C Iron
D Fluoride

The correct answer is:
Nitrate

Solution:
Parameters
Maximum prescribed conc. in drinking water

Iron
0.2 ppm

Fluoride
1.5 ppm

Lead
50 ppb

Nitrate
50 ppm

Hence the concentration of nitrate in a given water sample exceeds from the upper limit as given above.

Topic: Chemistry, Environmental Chemistry, NEET
The concentration of KI and KCl in a certain solution containing both is 0.001 M each. If 20 mL of this solution is added to 20 mL of a saturated solution of AgI in water. What will happen ?
K sp  of AgCl= 10 −10 ;  K sp  of AgI= 10 −16

Options:
A AgI will be precipitated
B AgCl will be precipitated
C Both AgCl and AgI will be precipitated
D There will be no precipitate

The correct answer is:
AgI will be precipitated

Solution:
I - solution I = 1 0 - 3 M
Cl - solution I = 1 0 - 3 M
Ag + solution II = K sp = 1 0 - 8 M
I â solution II = K sp = 1 0 - 8 M . on mixing the equal volume of two solutions.
I - = 1 0 - 3 + 1 0 - 8 2 = 1 0 - 3 1 + 1 0 - 5 2 â 5Ã10-4 M
Cl - = 1 0 - 3 2 M
Ag + = 10-165Ã10-4 =2Ã10-13
K IP AgI = 1 0 - 8 2 Ã 1 0 - 3 1 + 1 0 - 5 2 â 1 0 - 1 1 4>K sp AgI
K IP AgCl = 1 0 - 8 2 Ã 1 0 - 3 2 â 1 0 - 1 1 4 < K sp AgCl
Hence AgI will ppt, but AgCl will not ppt.

Topic: Chemistry, Ionic Equilibrium, NEET
The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10-19M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following FeSO4, MnCl2, ZnCl2and CdCl2. In which of these solutions precipitation will take place?

Options:
A FeSO4
B MnCl2
C ZnCl2
D CdCl2

The correct answer is:
ZnCl2

Solution:
Correct Option is : (C)
ZnCl2

Topic: Chemistry, Ionic Equilibrium, NEET
The concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.2Ã10-4 molL-1. Solubility product of Ag2C2O4 is

Options:
A 2.66×10-12
B 4.5×10-11
C 5.3×10-12
D 2.42×10-8

The correct answer is:
5.3×10-12

Solution:
Ag2CrO4⇌2Ag+2.2×10-4molL-1+CrO42-2.2×10-42molL-1
Ksp=(Ag+)2[CrO42-]
=(2.2×10-4)2×2.2×10-42
=5.32×10-12

Topic: Chemistry, Ionic Equilibrium, NEET
The concept of chemical evolution is based on:

Options:
A interaction of water, air and clay under intense heat
B effect of solar radiation on chemicals
C possible origin of life by combination of under suitable environmental conditions
D crystallization of chemicals.

The correct answer is:
possible origin of life by combination of under suitable environmental conditions

Solution:
The chemical evolution is the formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth. It is the first step in the development of life on this planet.

Topic: Biology, Evolution, NEET, NEET 2007
The concept of chemical evolution is based on

Options:
A Interaction of water, air and clay under intense heat
B Effect of solar radiation on chemicals
C Possible origin of life by combination of chemicals under suitable environmental conditions
D Crystallization of chemicals

The correct answer is:
Possible origin of life by combination of chemicals under suitable environmental conditions

Solution:
The concept of chemical evolution is based on possible origin of life by combination of chemicals under suitable environmental conditions. The distribution of elements in the cosmos is the result of many processes in the history of the Universe. It provides us with a powerful tool to study the Big Bang, the density of baryonic matter, nucleosynthesis and the formation and evolution of stars and galaxies.

Topic: Biology, Evolution, NEET
The concept of “Omnis cellula-e cellula” regarding cell division was first proposed by:

Options:
A Rudolf Virchow
B Theodore Schwann
C Schleiden
D Aristotle

The correct answer is:
Rudolf Virchow

Solution:
Omnis cellula-e cellula, that each cell derives from a pre-existing cell by division, is the culmination of a profound insight of the late 19th century and a dictum articulated by the German pathologist Rudolf Virchow.

Topic: Biology, Cell - The Unit of Life, NEET, NEET 2019 (All India)
The concept of transforming principle was first established by ____________ using the bacterium _________________.

Options:
A Hershey and Chase, Streptococcus pneumoniae
B A. Garrod, Escherichia coli
C Fredrick Griffith, Streptococcus pneumoniae
D Oswald Avery, Klebsiella pneumoniae

The correct answer is:
Fredrick Griffith, Streptococcus pneumoniae

Solution:
In 1928, Frederick Griffith, in a series of experiments with Streptococcus pneumoniae (bacterium responsible for pneumonia), witnessed a miraculous transformation in the bacteria. During the course of his experiment, a living organism (bacteria) had changed in physical form. He eventually went on to conclude that genetic material or 'transforming principle' was transformed from one strain to the other.

Topic: Biology, Molecular Basis of Inheritance, NEET
The conclusion of David Tilman regarding the biodiversity of organisms is

Options:
A Increased species diversity contributed to lower productivity
B Decreased species diversity contributed to higher productivity
C Increased species diversity contributed to higher productivity
D Organisms in colder areas have shorter limbs

The correct answer is:
Increased species diversity contributed to higher productivity

Solution:
David Tilman used outdoor plots to conduct long term ecosystem experiments. He observed that plots with more species showed more productivity and hence more biodiversity.

Topic: Biology, Biodiversity and its Conservation, NEET
The condition for methamoglobinemia by drinking water is

Options:
A > 50 PPm lead
B > 50 PPm chloride
C > 50 PPm nitrate
D > 100 PPm sulphate

The correct answer is:
> 50 PPm nitrate

Solution:
As per as EEC (European Environment Commission) NO3- > 50 PPm in water may lead to methemoglobinemia (Blue baby syndrome).

Topic: Chemistry, Environmental Chemistry, NEET
The condition in which the number of chromosomes changes in multiples of the genome is:

Options:
A Polyploidy
B Trisomy
C Monosomy
D Nullisomy

The correct answer is:
Polyploidy

Solution:
When chromosome number in an organism increases or decreases in multiple of n than the condition is known as polyploidy, but when one or more chromosome increases or decrease then the condition is known as aneuploidy. For example 2n+ 1, 2n - 1, 2n + 2, 2n-2, etc.

Topic: Biology, Principles of Inheritance and Variation, NEET
The condition in which the potassium levels are increased is known as

Options:
A Hypercholesterolemia
B Hyperkalemia
C Osteomalacia
D Hyperexcitability

The correct answer is:
Hyperkalemia

Solution:
An abnormal increase in blood concentration of K+ is called hyperkalemia.

Topic: Biology, Chemical Coordination and Integration, NEET
The condition in which there is one to many or one to few chromosomes is called as

Options:
A Anueploidy
B Polypoid
C Monoploidy
D Haploidy

The correct answer is:
Anueploidy

Solution:
When chromosome number in an organism increases or decreases in multiple of n than the condition is known as polyploidy, but when one or more chromosome increases or decrease then the condition is known as aneuploidy. For example 2n+ 1, 2n – 1, 2n + 2, 2n-2 , etc.

Topic: Biology, Principles of Inheritance and Variation, NEET
The condition of accumulation of urea in the blood is termed as

Options:
A Renal Calculi
B Glomerulonephritis
C Uremia
D Ketonuria

The correct answer is:
Uremia

Solution:
The condition of accumulation of urea in the blood is termed as Uremia.

Topic: Biology, Excretory Products and their Elimination, NEET
The condition or process of deterioration with age is termed as _____.

Options:
A Necrosis.
B Senescence.
C Photoperiodism.
D Vernalization.

The correct answer is:
Senescence.

Solution:
Ageing of leaves is called senescence. It is the process of growing old, which occurs in all species and is typified by a gradual slowing down of metabolism and breakdown of tissues, often accompanied by endocrinal changes.

Topic: Biology, Plant - Growth and Development, NEET
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

Options:
A the frequency of the microwave must match the resonant frequency of the water molecules
B the frequency of the microwave has no relation with natural frequency of water molecules
C microwave are heat waves, so always produce heating
D infrared waves produce heating in a microwave oven

The correct answer is:
the frequency of the microwave must match the resonant frequency of the water molecules

Solution:
It is electromagnetive wave, therefore the correct choice is (1).

Topic: Physics, Electromagnetic Waves, NEET, NEET 2013 (All India)
The condition under which a point charge moving through a magnetic field, experiences maximum force (in terms of magnitude) is

Options:
A v→||B→
B

θ=45° between v and B

C v→⊥B→
D charge is positive

The correct answer is:
v→⊥B→

Solution:
When the electron moves perpendicular to the direction of the magnetic field, it experiences maximum force.

Topic: Physics, Magnetic Effects of Current, NEET
The condition with the united calyx in a flower is called as

Options:
A Gamosepalous
B Polysepalous
C Polypetalous
D Gamopetalous

The correct answer is:
Gamosepalous

Solution:
The calyx is the outermost whorl of the flower. It is made of units called sepals. These sepals can be united/fused or can be free from each other. The gamosepalous condition shows that the sepals are united. The polysepalous condition shows that the sepals are free from each other.

Topic: Biology, Morphology of Flowering Plants, NEET
The conducting part of the respiratory system is

Options:
A The part starting with trachea up to the terminal bronchioles
B The part starting with the external nostrils up to the terminal bronchioles
C The part starting with the initial bronchioles up to the terminal bronchioles
D The part starting with the external nostrils up to the respiratory bronchioles

The correct answer is:
The part starting with the external nostrils up to the terminal bronchioles

Solution:
Respiratory system in human helps in conducting the fresh air and used air along with the exchange of gases (oxygen with carbon dioxide). Conducting part is the one that helps in transport of atmospheric fresh air and spent air. This part starts from the nostrils and extends upto the terminal bronchioles and post that is the exchange site in the alveoli sacs.

Topic: Biology, Breathing and Exchange of Gases, NEET
The conductivity of 1×10-3 M acetic acid is 5×10-5Scm-1 and Λ° is 390.5 S cm2mol-1 . The dissociation constant of acetic acid is

Options:
A 81.78×10-4
B 81.78×10-5
C 18.78×10-6
D 18.78×10-5

The correct answer is:
18.78×10-6

Solution:
Îv=ÎºvÃ1000M=5Ã10-5Ã10001Ã10-3=50 Scm2mol-1
So Î±=ÎvÎâ=50390.5=0.13
Now, κ a = cα 2 1−α = 10 −3 × (0.13) 2 0.87 =1.9× 10 −5 ≃19× 10 −6

Topic: Chemistry, Ionic Equilibrium, NEET
The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S cm–1. Calculate its molar conductivity.

Options:
A 0.0248 S cm² mol⁻¹
B 0.0464 S cm² mol⁻¹
C 0.124 S cm² mol⁻¹
D 0.0083 S cm² mol⁻¹

The correct answer is:
0.0248 S cm² mol⁻¹

Solution:
Correct Option is : (A)
0.0248 S cm² mol⁻¹

Topic: Chemistry, Electrochemistry, NEET
The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm-1 cm-1 and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of cell constant is

Options:
A 3.34 cm-1
B 1.34 cm-1
C 3.28 cm-1
D 1.26 cm-1

The correct answer is:
1.26 cm-1

Solution:
Conductivityκ=0.0210 ohm-1cm-1

ResistanceR=60 ohm

The relation between specific conductance or conductivity and resistance is

κ=1Rla

In the above equation la is the cell constant.

la=κ×R

⇒la=0.0210×60=1.26 cm-1

Topic: Chemistry, Electrochemistry, NEET, NEET 2023 (All India)
The conductivity of strong electrolyte

Options:
A Increases on dilution slightly
B Decreases on dilution
C Does not change with dilution
D Depends upon density of electrolyte itself

The correct answer is:
Increases on dilution slightly

Solution:
Strong electrolytesThese well-behaved systems include many simple salts such as NaCl, as well as all strong acids. The Λ vs. √c plots closely follow the linear relationΛ = Λ° – b √c

Topic: Chemistry, Electrochemistry, NEET
The conjugate base of H 2 PO 4 - is â

Options:
A P2O5
B H3PO4
C H PO 4 2 -
D PO 4 3 -

The correct answer is:
H PO 4 2 -

Solution:
H 2 PO 4 - 1 ⇌ H PO 4 2 - + H +

Topic: Chemistry, Ionic Equilibrium, NEET
The conjugate base of HO[CH2]3NH2 is

Options:
A H 2 O + (CH 2 ) 3 NH 2
B HO(CH 2 ) 3 N + H 3
C O ¯ ( CH 2 ) 3 NH 2
D HO(CH 2 ) 3 N ¯ H

The correct answer is:
O ¯ ( CH 2 ) 3 NH 2

Solution:
HO[CH2]3NH2→O-(CH2)3NH2+H+
Conjugate base is obtained by the removal of H+ from more acidic site. Since H-O is more acidic than H-N , therefore, C is the conjugate base.

Topic: Chemistry, Ionic Equilibrium, NEET
The connecting link between apes and man is

Options:
A Dryopithecus
B Ramapithecus
C Australopithecus
D Propliopithecus

The correct answer is:
Australopithecus

Solution:
Australopithecus had many characters of man as well as apes. Its ape-like characters include cranial capacity of around 600 cc, U-shaped prognathous jaw and larger teeth. Its man-like characters include erect posture and forelimbs shorter than hindlimbs. Hence, it is considered as connecting link between apes and man.

Topic: Biology, Evolution, NEET
The connective tissue which connects bones to muscles are called

Options:
A Tendons
B Ligaments
C Cartilage
D Bones

The correct answer is:
Tendons

Solution:
In the dense regular connective tissues, the collagen fibres are present in rows between many parallel bundles of fibres. Tendons, which attach skeletal muscles to bones and ligaments which attach one bone to another are examples of this tissue.

Topic: Biology, Structural Organisation in Animals, NEET
The consequence of the Industrial Revolution which took place in England was

Options:
A White colour moths were more in rural area
B Black coloured moths were more in urban area
C No variant was completely wiped out
D All of the above

The correct answer is:
All of the above

Solution:
At the start of this period, the vast majority of peppered moths had light coloured wing patterns which effectively camouflaged them against the light-coloured trees and lichens upon which they rested. However, due to widespread pollution during the Industrial Revolution in England, many of the lichens died out, and the trees which peppered moths rested on became blackened by soot, causing most of the light-coloured moths, or typica, to die off due to predation.

Topic: Biology, Evolution, NEET
The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid of

Options:
A Salmonella typhimurium
B Escherichia coli
C Haemophilus influenzae
D Bacillus thuringiensis

The correct answer is:
Salmonella typhimurium

Solution:
The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid (autonomously replicating circular extra-chromosomal DNA) of Salmonella typhimurium. Stanley Cohen and Herbert Boyer accomplished this in 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2015 (Phase 2)
The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid of

Options:
A Salmonella typhimurium
B Escherichia coli
C Haemophilus influenzae
D Bacillus thuringiensis

The correct answer is:
Salmonella typhimurium

Solution:
The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid (autonomously replicating circular extra-chromosomal DNA) of Salmonella typhimurium. Stanley Cohen and Herbert Boyer accomplished this in 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The construction of the first recombinant DNA emerged with the idea of linking an antibiotic-resistant gene with a native plasmid of ________________________.

Options:
A Salmonella typhimurium
B Escherichia coli
C Streptococcus pneumoniae
D Klebsiella pneumoniae

The correct answer is:
Salmonella typhimurium

Solution:
The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid (autonomously replicating circular extra-chromosomal DNA) of Salmonella typhimurium. Stanley Cohen and Herbert Boyer accomplished this in 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The contraceptive 'Saheli':

Options:
A Is an IUD.
B Increase the concentration of estrogen and prevents ovulation in females.
C Blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
D Is a post-coital contraceptive.

The correct answer is:
Blocks estrogen receptors in the uterus, preventing eggs from getting implanted.

Solution:
Saheli chemically Centchroman is a non-hormonal birth control pill. Instead of using the hormone estrogen to prevent pregnancy, it contains a drug that blocks estrogen.
Usually, increased doses of estrogen stop a woman’s ovaries from releasing an egg. However, by blocking estrogen in the uterus, Saheli alters the uterus’ lining, which prevents a fertilized egg from implanting.

Topic: Biology, Reproductive Health, NEET, NEET 2018
The contractile protein of skeletal muscle involving ATPase activity is

Options:
A troponin
B tropomyosin
C myosin
D $\alpha$-actinin

The correct answer is:
myosin

Solution:
The kinesin, myosin and dynein proteins of skeletal muscles involve ATPase activity, which causes the contraction of skeletal muscles, propelling action of cilia and flagella and the intracellular transport of organelles.

Topic: Biology, Locomotion and Movement, NEET, NEET 2006
The contractile vacuole is an important site for excretion and it is absent in

Options:
A Euglena
B Entamoeba
C Plasmodium
D Paramoecium

The correct answer is:
Plasmodium

Solution:
A contractile vacuole is involved in osmoregulation. It is majorly found in protists and unicellular algae. Hence, it is present in Euglena, Amoeba and Paramoecium and absent in Plasmodium.

Topic: Biology, Biological Classification, NEET
The contraction of internal intercostal muscles takes place during

Options:
A effortless inhalation.
B effortless exhalation.
C forceful inhalation.
D forceful exhalation.

The correct answer is:
forceful exhalation.

Solution:
The muscles of respiration are attached to the rib cage. There are principal and accessory muscles who work to expand and contract the rib cage in order to inhale and exhale. Generally the process of inspiration is active and expiration is passive in nature. The contraction of internal intercostal muscles pushes the rib cage downwards and inwards. This decreases the intrapulmonary volume, increasing the intrapulmonary pressure. This leads to the removal of air from the lungs (expiration). Normal (effortless) expiration is brought about by relaxation of external intercostal muscles and diaphragm.

Topic: Biology, Breathing and Exchange of Gases, NEET
The contrast in the fringes in any interference pattern depends on -

Options:
A Fringe width
B Wavelength
C Intensity ratio of the sources
D Distance between the sources

The correct answer is:
Intensity ratio of the sources

Solution:
Fringe visibility or the contrast of the fringes is given by
V=2I1I21+I1I2

Topic: Physics, Wave Optics, NEET
The contrasting characteristics generally in a pair used for identification of animals in taxonomic key are referred to as

Options:
A lead
B couplet
C doublet
D alternate

The correct answer is:
couplet

Solution:
Couplet is the contrasting characteristic generally in a pair used for identification of animals in taxonomic key. It represents the choice made between two opposite options, each half of a couplet is called lead. Separate taxonomic keys are required for each taxonomic category like family, genus species.

Topic: Biology, The Living World, NEET, NEET 2019 (Odisha)