datavorous/entrance-exam-dataset huggingface dataset:
The equivalent weight of MnSO4 is half of its molecular weight when it in converted to

Options:
A Mn2O3
B MnO2
C MnO4-
D MnO42-

The correct answer is:
MnO2

Solution:
Mn2++2H2O→MnO2+4H++2e-
Since 1 mol of MnSO4 , when converted to MnO2 , loses 2 mol electron, therefore, its equivalent weight would be one-half of its molecular weight. It is not so in A, C and D.
A. 2Mn2++3H2O→Mn2O3+6H++2e-
C. Mn2++4H2O→MnO4-+8H++5e-
D. Mn2++4H2O→MnO42-+8H++4e-

Topic: Chemistry, Redox Reactions, NEET
The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are:

Options:
A Random errors
B Instrumental errors
C Personal errors
D Least count errors

The correct answer is:
Random errors

Solution:
The errors which cannot be associated with any systematic or constant cause are called random errors. These errors can arise due to unpredictable fluctuations in experimental conditions, e.g., random change in pressure, temperature, voltage supply etc. An example of random error is putting the same weight on an electronic scales several times and obtaining readings that vary in random fashion from one reading to the next.

Topic: Physics, Mathematics in Physics, NEET, NEET 2023 (All India)
The escape velocity for earth is $v$. A planet having 9 times mass that of earth and radius, 16 times that of earth, has the escape velocity of:

Options:
A $\frac{v}{3}$
B $\frac{2 v}{3}$
C $\frac{3 v}{4}$
D $\frac{9 v}{4}$

The correct answer is:
$\frac{3 v}{4}$

Solution:
Escape velopity of object from planet is given by
$\left(v_e\right)_p=\sqrt{\frac{2 G M_p}{R_p}}$
$\therefore \quad\left(v_e\right)_p \propto \sqrt{\frac{M_p}{R_p}}$
Now, $M_p=9 M_e$ and $R_p=16 R_e$ (given)
$\frac{\left(v_e\right)_p}{\left(v_e\right)_e}=\sqrt{\frac{M_p}{R_p} \times \frac{R_e}{M_e}}=\sqrt{\frac{9 M_e}{16 R_e} \times \frac{R_e}{M_e}}=\sqrt{\frac{9}{16}}=\frac{3}{4}$
$\Rightarrow \quad\left(v_e\right)_p=\frac{3}{4} v$

Topic: Physics, Gravitation, NEET, NEET 2024 (Re-NEET)
The escape velocity from the earth is 11 km s-1. The escape velocity from a planet having twice the radius and same mean density as that of the earth is

Options:
A 5.5 km s-1
B 11 km s-1
C 22 km s-1
D None of these

The correct answer is:
22 km s-1

Solution:
Escape velocity,
vascape=2 GMR
=R83ÏGÏ
â´veâR if Ï=constant.
Since the planet is having double radius in comparision to earth, therefore escape velocity becomes twice ie, 22 km s-1 .

Topic: Physics, Gravitation, NEET
The escape velocity from the Earth is 11.2 km s -1. The escape velocity from a planet having twice the radius and the same mean density is ( in km s-1 )

Options:
A 11.2
B 5.6
C 15
D 22.4

The correct answer is:
22.4

Solution:
Escape velocity from the Earth,
(ve)=11.2 km s-1
Let the mass, radius and density of Earth be M, R and Ï, respectively, and for the given planet, mass, radius and density are Mâ², Râ² and Ï', respectively.
â´ Escape velocity from the Earth,
ve=2GÃ43ÏR3ÏR
ve=8GÏR2Ï3 â¦.i
Similarly, escape velocity from the given planet,
vâ²e=8GÏRâ²2Ï3 â¦.ii
Dividing Eq. (i) by Eq. (ii), we get,
vevâ²e=8GÏR2Ï3 Ã38GÏRâ²2Ï =R24Râ²2

or 11.2vâ²e=R2R
â´ vâ²e=22.4 km s-1

Topic: Physics, Gravitation, NEET
The escape velocity from the earth is about 11 km s-1. The escape velocity from a planet having twice the radius and the same mean density as the earth is

Options:
A 22 km s-1
B 11 km s-1
C 5.5 km s-1
D 15.5 km s-1

The correct answer is:
22 km s-1

Solution:
The escape velocity can be given by

v=2GMR=2G43πR2d
v∝Rd

Hence escape velocity from the other planet is,
v'=2v0

Topic: Physics, Gravitation, NEET
The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius four times that of Earth and the same mass density is:

Options:
A v
B 2v
C 3v
D 4v

The correct answer is:
4v

Solution:
Given,

Escape velocity from earth's surface =v

v=vearth =2gR

=2GM43πR343πR2=2GMV43πR2=8GρπR23

g= Gravitation acceleration on earth surface

R= Radius of earth

G=Universal gravitational constant

Escape velocity of another planet =?

∵Rp=4R&

ρplanet =ρearth

So we can write,

ve∝R2∝R

veearth veplanet =Rearth Rplanet =R4R=14

It means,

4veearth =vePlanet

vePlanet =4v

Topic: Physics, Gravitation, NEET, NEET 2021
The escape velocity of a body on the earth surface is $11.2 \mathrm{~km} / \mathrm{s}$. If the same body is projected upward with velocity $22.4 \mathrm{~km} / \mathrm{s}$, the velocity of this body at infinite distance from the centre of the earth will be

Options:
A $11.2 \mathrm{~km} / \mathrm{s}$
B $11.2 \sqrt{3} \mathrm{~km} / \mathrm{s}$
C $11.2 \sqrt{2} \mathrm{~km} / \mathrm{s}$
D Zero

The correct answer is:
$11.2 \sqrt{3} \mathrm{~km} / \mathrm{s}$

Solution:
$\begin{aligned} & V^{\prime 2}=V^2-V e^2 \\ & V^{\prime}=\sqrt{V^2-V e^2} \\ & =\sqrt{(22.4)^2-(11.2)^2} \\ & V^{\prime}=11.2 \sqrt{3} \mathrm{~km} / \mathrm{s}\end{aligned}$

Topic: Physics, Gravitation, NEET, NEET 2023 (Manipur)
The escape velocity of a body on the surface of the earth is 11.2 km s-1. If the earth's mass increases to twice its present value and radius of the earth becomes half, the escape velocity becomes

Options:
A 5.6 km s-1
B 11.2 km s-1
C 22.4 km s-1
D 44.8 km s-1

The correct answer is:
22.4 km s-1

Solution:
Ve=2GMeRe=11.2 km s-1
Now M′=2Me & R′=Re2
So Ve′=2G2MeRe2=22GMeRe=2×11.2
=22.4 km s-1

Topic: Physics, Gravitation, NEET
The essential chemical components of many coenzymes are

Options:
A proteins
B nuclei acids
C carbohydrates
D vitamins

The correct answer is:
vitamins

Solution:
Essential chemical components of many coenzymes are vitamins, e.g., coenzyme Nicotinamide Adenine Dinucleotide (NAD) and NADP contain the vitamin niacin. Proteins, nucleic acids and carbohydrates are not enzymatic biomolecules.

Topic: Biology, Biomolecules (B), NEET, NEET 2013 (All India)
The essential chemical components of many coenzymes are

Options:
A Nucleic acid
B Carbohydrates
C Vitamins
D Proteins

The correct answer is:
Vitamins

Solution:
Some of the cofactors, termed coenzymes, consist of small organic molecules, many of which are derived from vitamins. Vitamins themselves are organic molecules that are needed in small amounts in the diets of some higher animals. These molecules serve the same roles in nearly all forms of life, but higher animals lost the capacity to synthesize them in the course of evolution. For instance, whereas E. coli can thrive on glucose and organic salts, human beings require at least 12 vitamins in the diet. The biosynthetic pathways for vitamins can be complex; thus, it is biologically more efficient to ingest vitamins than to synthesize the enzymes required to construct them from simple molecules. This efficiency comes at the cost of dependence on other organisms for chemicals essential for life.

Topic: Chemistry, Biomolecules, NEET
The estimation of more than 70% of the world livestock population is in

Options:
A India and China
B China and England
C Russia and India
D Europe and China

The correct answer is:
India and China

Solution:
It is estimated that more than 70% of the world livestock population is in India and China. However, it is surprising to note that the contribution to the world farm produce is only 25%, i.e., the productivity per unit is very low.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
The eukaryotic, multicellular, saprophytic organisms reproduce sexually by

Options:
A Zygospores, ascospores, basidiospores
B Zoospores, ascospores, basidiospores
C Sporangiospores and conidia
D Zygospores, zoospores, basidiospores

The correct answer is:
Zygospores, ascospores, basidiospores

Solution:
The eukaryotic, multicellular, saprophytic organisms are Fungi. Zygospores are formed by fusion of two gametes. It is seen in Phycomycetes. Sexual spores are called ascospores are produced endogenously in sac like asci in Ascomycetes. In Basidiomycetes, plasmogamy is brought about by fusion of two vegetative or somatic cells of different strains or genotypes. The resultant structure is dikaryotic which ultimately gives rise to basidium. Karyogamy and meiosis take place in the basidium producing four basidiospores.
In Phycomycetes, asexual reproduction takes place by zoospores (motile) or by aplanospores (non-motile). These spores are endogeneously produced in sporangium (Sporangiospores). In Ascomycetes, the asexual spores are conidia produced exogenously on the special mycelium called conidiophores.

Topic: Biology, Biological Classification, NEET
The events in pollen–pistil interaction includes all, except

Options:
A Pollen deposition on the stigma until pollen tubes reach the ovary.
B Release of pollen from one flower to the formation of pollen tubes.
C Pollen deposition on the stigma until the formation of pollen tubes.
D Pollen deposition on the stigma until pollen tubes enter the ovule.

The correct answer is:
Pollen deposition on the stigma until pollen tubes enter the ovule.

Solution:
The process of release of pollen grains from a flower and its deposition on the stigma is called pollination. Pollen–pistil interaction involves recognition of pollen, promotion or inhibition of pollen, the formation of the pollen tube and entry of pollen tube into the ovary and finally within the ovule.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The evil quartet represents

Options:
A Four major causes of biodiversity losses
B Four major causes of ozone depletion
C Four major causes of global warming
D Four major causes of water pollution

The correct answer is:
Four major causes of biodiversity losses

Solution:
The four major causes of biodiversity losses:

Habitat loss and fragmentation

Over-exploitation of natural resources

Invasion by alien species

Co-extinctions

These are collectively called the evil quartet.

Topic: Biology, Biodiversity and its Conservation, NEET
The evolutionary important character of Selaginella is

Options:
A Presence of ligule
B Unorganized strobili
C The characteristic functions of rhizopores
D Heterosporous nature

The correct answer is:
Heterosporous nature

Solution:
Presence of two types of spores microspores and megaspores (heterospory) is the evolutionary characteristic in the life cycle of Selaginella.

Topic: Biology, Plant Kingdom, NEET
The exaggerated response of the immune system in which IgE type of antibody is produced is called

Options:
A Allergy
B Auto immunity
C Active immunity
D Passive immunity

The correct answer is:
Allergy

Solution:
The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The substance to which such an immune response is produced is called an 'allergen'. Eg: pollens, animal dander, etc. The IgE type of antibody is present in this type of response.

Topic: Biology, Human Health and Diseases, NEET
The example of amorphous solid is

Options:
A Cesium chloride
B Glass
C Mohr Salt
D Calcium fluoride

The correct answer is:
Mohr Salt

Solution:
Amorphous solids neither have ordered arrangement (i.e. no definite shape) nor have sharp melting point like crystals, but when heated, they become pliable until they assume the properties usually related to liquids. It is therefore they are regarded as super-cooled liquids.

Topic: Chemistry, Solid State, NEET
The example of C4 plants is

Options:
A maize.
B spinach.
C cotton.
D both (A) and (B).

The correct answer is:
maize.

Solution:
The C4 pathway is an efficient way of carbon dioxide fixation even at low concentrations. These plants are known as C4 plants as the first stable product of the dark reaction is oxaloacetate which is a 4 carbon compound.
Example: Maize, sorghum, sugarcane etc.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The example of the trait that is controlled by many genes in human beings is

Options:
A Skin colour
B Phenylketonuria
C Colour blindness
D Sickle cell anaemia

The correct answer is:
Skin colour

Solution:
The traits generally controlled by three or more genes are called as polygenic traits. Human skin colour is a classic example of this. In a polygenic trait, the phenotype reflects the contribution of each allele, i.e, the effect of each allele is additive. To understand this better, let us assume that three genes A, B, C control skin colour in human, with the dominant forms A, B and C responsible for dark skin colour and the recessive forms a, b and c for light skin colour. The genotype with all the dominant alleles (AABBCC) will have the darkest skin colour and that with all the recessive alleles (aabbcc) will have the lightest skin colour. As expected, the genotype with three dominant alleles and three recessive alleles will have an intermediate skin colour.

Topic: Biology, Principles of Inheritance and Variation, NEET
The excess pressure inside a spherical drop of water is four times that of another drop. Then, their respective mass ratio is

Options:
A 1:16
B 8:1
C 1:4
D 1:64

The correct answer is:
1:64

Solution:
Excess pressure inside a spherical drop of water
p=2TR
Given, p1=4p2
2TR1=4Ã2TR2
or R2=4R1
Now, m1m2=4ÏR13d14ÏR23d2
or m1m2=R13R23
m1m2 =164

Topic: Physics, Mechanical Properties of Fluids, NEET
The excess pressure inside an air bubble of radius r just below the surface of the water is ​P1. The pressure inside a drop of the same radius just outside the surface is P2. If T is the surface tension then

Options:
A P1=2P2
B P⁡1=P⁡2
C P2=2P1
D P2=0,P1≠0

The correct answer is:
P⁡1=P⁡2

Solution:
Excess pressure inside a bubble just below the surface of water is P⁡1=2T⁡r⁡ and excess pressure inside a drop just outside the surface is P2=2Tr.
Hence, P⁡1=P⁡2

Topic: Physics, Mechanical Properties of Fluids, NEET
The exchange of chromosomal segments between non-sister chromatids is seen during?

Options:
A Leptotene
B Pachytene
C Diplotene
D Diakinesis

The correct answer is:
Pachytene

Solution:
Exchange of segments between homologous chromosomes is known as crossing over. It occurs during pachytene stage of prophase-I of meiosis.

Topic: Biology, Cell Cycle and Cell Division, NEET
The exchange of gases in the alveoli of the lungs takes place during respiration. Identify the labeling a-e.

Options:
A a-Air flows into and out of alveoli
b-Deoxygenated blood
c-Oxygenated blood
d-Oxygen diffuses into red blood cells
e-Carbon dioxide diffuses out of the plasma

B a-Air flows out of alveoli
b-Oxygenated blood
c-Deoxygenated blood
d-Oxygen diffuses into red blood cells
e-Carbon dioxide diffuses out of the plasma

C a-Air flows into alveoli
b-Deoxygenated blood
c-Oxygenated blood
d-Carbon dioxide diffuses out of the plasma
e-Oxygen diffuses into red blood cells

D a-Oxygen flows into and out of alveoli
b-Oxygenated blood
c-Deoxygenated blood
d-Carbon dioxide diffuses out of the plasma
e-Oxygen diffuses into red blood cells

The correct answer is:
a-Air flows into and out of alveoli
b-Deoxygenated blood
c-Oxygenated blood
d-Oxygen diffuses into red blood cells
e-Carbon dioxide diffuses out of the plasma

Solution:
Gaseous exchange between blood (dissolved phase) and alveolar air (gaseous phase) across respiratory membrane occurs by simple diffusion. Obviously, it depends upon the concentration gradient (partial pressure) of the concerned gases in blood and alveolar air.

Topic: Biology, Breathing and Exchange of Gases, NEET
The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

Options:
A Ionization isomerism
B Linkage isomerim
C Geometrical isomerism
D Coordinatin isomerism

The correct answer is:
Geometrical isomerism

Solution:
As [Co(NH3)4Cl2]+ is capable of showing geometrical isomerism i.e. cis and trans isomers which means it can have two different coloured complexes.

Topic: Chemistry, General Organic Chemistry, NEET
The existence of two different coloured complexes with the composition of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$is due to

Options:
A linkage isomerism
B geometrical isomerism
C coordination isomerism
D ionisation isomerism

The correct answer is:
geometrical isomerism

Solution:
Key Idea Complexes of $\left[\mathrm{MA}_4 \mathrm{~B}_2\right]$ type exhibit geometrical isomerism.
The complex $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$is a $\left[\mathrm{MA}_4 \mathrm{~B}_2\right]$ type complex and thus, fulfills the conditions that are necessary to exhibit geometrical isomerism. Hence, it has two geometrical isomers of different colours as :
The structure of the geometrical isomers is as
For linkage isomerism, presence of ambidentate ligand is necessary. For coordination isomerism, both the cation and anion of the complex must be complex ions. For ionisation isomerism, an anion different to the ligands must be present outside the coordination sphere. All these conditions are not satisfied by this complex. Hence, it does not exhibit other given isomerisms.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2010 (Screening)
The exotic species of Eichhornia

Options:
A was introduced by Europeans in India.
B was introduced in India accidentally.
C was introduced in Lake Victoria of South America.
D is a straggling shrub of tropical America.

The correct answer is:
was introduced by Europeans in India.

Solution:
Eichhornia crassipes is a perennial herbaceous species, aquatic. Plants forming clumps floating or rooted in the mud, were introduced by Europeans in India for its beautiful flowers.

Topic: Biology, Environmental Issues, NEET
The experimental data for decomposition of N2O5: [ 2N2O5→ 4NO2+ O2] in gas phase at 318K are given below:
What is the rate law ?

Options:
A Rate=k[N2O5]3
B Rate=k[N2O5]2
C Rate=k[N2O5]
D Rate=k

The correct answer is:
Rate=k[N2O5]

Solution:
Correct Option is : (C)
Rate=k[N2O5]

Topic: Chemistry, Chemical Kinetics, NEET
The experimental data for decomposition of N2O5:
[ 2N2O5→ 4NO2+ O2] in gas phase at 318K are given below: Which of the following options is closest to the rate constant?.

Options:
A 4.84×10−4s-1
B 6.62×10−4s-1
C 8.89×10−4s-1
D 10.36×10−4s-1

The correct answer is:
4.84×10−4s-1

Solution:
Correct Option is : (A)
4.84×10−4s-1

Topic: Chemistry, Chemical Kinetics, NEET
The experimental proof for semiconservative replication of DNA was first shown in a

Options:
A Plant
B Bacterium
C Fungus
D Virus

The correct answer is:
Bacterium

Solution:
The experimental proof for semiconservative replication of DNA was first shown in a bacterium - Escherichia coli. It was discovered by Meselson and Stahl in 1958.
In this mode of replication, one strand of parent DNA is conserved in the progeny while the second is freshly synthesized. Meselson and Stahl proved the evidence for the theory by using an isotope of Nitrogen (N15).

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2018
The expression 'gynoecium is polycarpellary apocarpous' implies that the

Options:
A Gynoecium comprises only one pistil which is fused with the stamen
B Gynoecium comprises more than one carpel, all of which are free
C Gynoecium comprises only one carpel which is free
D Gynoecium comprises more than one carpel which are fused

The correct answer is:
Gynoecium comprises more than one carpel, all of which are free

Solution:
Gynoecium having a single carpel is called monocarpellary (two carpels: bicarpellary, three: tricarpellary, many: polycarpellary). Carpels may be free, then the gynoecium is called apocarpous (e.g., polycarpellary apocarpous in rose, lotus and Ranunculus) and when they are fused, the gynoecium is known to be syncarpous.

Topic: Biology, Morphology of Flowering Plants, NEET
The extension in a string obeying Hook's law is x. the speed of sound in the stretched string is v. if the extension in the string is increased to 1.5x, the speed of sound will be

Options:
A 1.22v

B 0.61v

C 1.50v

D 0.75v

The correct answer is:
1.22v

Solution:
Speed of sound in a stretched string
v=Tμ …i
Where T is the tension and μ is mass per unit length.
According to Hooke's law, F∝x
T∝x …ii
From Eqs. (i) and (ii)
v∝x
v′=1.5v=1.22 v

Topic: Physics, Waves and Sound, NEET
The extinct human who lived 100000 to 40000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was

Options:
A Homo habilis
B Neanderthal human
C Cro-magnon humans
D Ramapithecus

The correct answer is:
Neanderthal human

Solution:
Neanderthal man with a brain size of $1400 \mathrm{cc}$ lived in near East and Central Asia, Europe and North Africa between 100000 to 40000 years back. It had slightly prognathus face sloping forehead eye brow ridges, smaller or no chin, large receding jaws, thick-boned skull and high domed head. They used hides to protect their body and buried their dead.

Topic: Biology, Evolution, NEET, NEET 2012 (Screening)
The extinction of dinosaur took place

Options:
A before the origin of seaweeds.
B before the origin of first amphibian.
C when the rise of modern fishes, birds, and placental mammals were seen.
D after the the origin of turtles.

The correct answer is:
when the rise of modern fishes, birds, and placental mammals were seen.

Solution:
Primitive Earth, 4.5 BYA, Jawless fishes, 350 MYA, Seaweeds, 320 MYA, and then came reptiles. The extinction of dinosaur takes place around 65 million years ago in the cretaceous period and during that time we could see the rise of modern fishes, birds, and placental mammals.

Topic: Biology, Evolution, NEET
The extinction of dinosaurs occurred around

Options:
A 65 mya
B 25 mya
C 150 mya
D 2000 mya

The correct answer is:
65 mya

Solution:
Extinction of dinosaurs happened about 65 million years ago, at the end of the Cretaceous Period. The Cretaceous-Tertiary extinction event, also called as the K-T event took place for the die-off of the dinosaurs. It is believed that this event is caused by climate and geological changes affected the food supply and that led to the extinction of dinosaurs.

Topic: Biology, Evolution, NEET
The extinction of passenger pigeon was due to

Options:
A Increased number of predatory birds
B Over exploitation by humans
C Non-availability of the food
D Bird flu virus infection

The correct answer is:
Over exploitation by humans

Solution:
Humans have always depended on nature for food and shelter but when ‘need’ turns to ‘greed’ it leads to over-exploitation of natural resources. In the last 500 years many species extinctions (Steller’s sea cow, passenger’s pigeon) were due to over-exploitation by human.

Topic: Biology, Biodiversity and its Conservation, NEET
The extinction of passenger pigeon was due to

Options:
A Increased number of predatory birds
B Over exploitation
C Non-availability of the food
D Disease in pigeon

The correct answer is:
Over exploitation

Solution:
When need turns to greed, it leads to over exploitation of natural resources. Many species extinction in last 500 years were due to overexploitation by humans. Stellar sea cow and passenger pigeon became extinct in past due to over exploitation.

Topic: Biology, Biodiversity and its Conservation, NEET
The eyes of Octopus and eyes of cat show different patterns of structure, yet they perform similar function. This is an example of

Options:
A homologous organs that have evolved due to convergent evolution
B homologous organs that have evolved due to divergent evolution
C analogous organs that have evolved due to convergent evolution
D analogous organs that have evolved due to divergent evolution

The correct answer is:
analogous organs that have evolved due to convergent evolution

Solution:
The analogous organs are not anatomically similar structures through they perform similar functions. Hence, analogous structures are a result of convergent evolution different structures evolving for the same function and hence, having similarity.
Homologous organs developed along different direction due to adaptations to different needs. This is divergent evolution and the structures are homologous.

Topic: Biology, Evolution, NEET, NEET 2013 (All India)