datavorous/entrance-exam-dataset huggingface dataset:
Water containing cavities in vascular bundles are found in

Options:
A sunflower
B maize
C Cycas
D Pinus

The correct answer is:
maize

Solution:
In monocot stem like Zea mays, vascular bundles are conjoint, collateral and closed. In vascular bundles, the lowermost protoxylem vessels and xylem parenchyma cells dissolve forming a water containing schizolysigenous cavity called protoxylem cavity or lacuna or lysigenous cavity. Protoxylem cavity and protophloem may be absent in the smaller vascular bundles in maize.

Topic: Biology, Anatomy of Flowering Plants, NEET, NEET 2012 (Screening)
Water drains out of a vessel filled with water upto height h through a hole of area A in t seconds. If the height of the water is 4 h then how much time will be required for the water to drain out? [Assume Aâª A 0 (area of tank)]

Options:
A t seconds
B 4t seconds
C 2t seconds
D t 4 seconds

The correct answer is:
2t seconds

Solution:
Time required to empty the tank
t=AA02Hg⇒t2t1=H2H1=4hh=2
∴ t 2 = 2 t seconds

Topic: Physics, Mechanical Properties of Fluids, NEET
Water falls from a height of $60 \mathrm{~m}$ at the rate of $15 \mathrm{~kg} / \mathrm{s}$ to operate a turbine. The losses due to frictional forces are $10 \%$ of energy. How much power is generated by the turbine? $\left(g=10 \mathrm{~m} / \mathrm{s}^2\right)$

Options:
A $8.1 \mathrm{~kW}$
B $10.2 \mathrm{~kW}$
C $12.3 \mathrm{~kW}$
D $7.0 \mathrm{~kW}$

The correct answer is:
$8.1 \mathrm{~kW}$

Solution:
Power generated by the turbine is,
$\begin{aligned}
P_{\text {gene rated }} & =P_{\text {input }} \times \frac{90}{100} \\
& =\frac{M g h}{t} \times \frac{90}{100}
\end{aligned}$
Putting the given values
$\begin{aligned}
& \frac{M}{t}=15 \mathrm{~kg} / \mathrm{s}, g=10 \mathrm{~m} / \mathrm{s}^2, h=60 \mathrm{~m} \\
& P_{\text {generated }}=(15 \times 10 \times 60) \times \frac{90}{100} \\
&=8.1 \mathrm{~kW}
\end{aligned}$

Topic: Physics, Work Power Energy, NEET, NEET 2008 (Screening)
Water flows steadily through a horizontal pipe of a variable cross-section. If the pressure of the water is p at a point, where the speed of the flow is v , what is the pressure at another point, where the speed of the flow is 2v? Let the density of water be 1 g cm-3.

Options:
A p+32ρ v2
B p-2ρv2
C p-3ρv2
D p-32ρv2

The correct answer is:
p-32ρv2

Solution:
Two point are situated in a pipe and their height from ground is same
âµ According Bernoulli's theorem,
p+Ïgh+12Ïv2= constant
At a point pressure of water is p and speed of flow is v
therefore, p+12Ïv2=c .....(i)
At another point speed of flow is 2v therefore,
p1+12Ï2v2=c ......(ii)
To find pressure p1 at another point, equating the equation (i) and (ii)
â p+12Ïv2=p1+12Ï4v2
â p1=p-32Ïv2

Topic: Physics, Mechanical Properties of Fluids, NEET
Water is falling from a height of 100 m at a rate of 100 kg s-1. The power delivered to the turbine is approximately equal to

Options:
A 100 kW

B 10 kW
C 1 kW
D 1000 kW

The correct answer is:
100 kW

Solution:
Given: Height of the water fall (h) = 100 m and quantity of water falling (Q) = 100 kg/s
Power delivered to the turbine (P) = Qgh
= 100 x 10 x 100 = 100000 W = 100 kW
(where g = 10 m/s2)

Topic: Physics, Work Power Energy, NEET
Water is filled in a cylindrical container to a height of 3 m. The ratio of the cross-sectional area of the orifice and the beaker is 0.1. The square of the speed of the liquid coming out from the orifice is (g=10 m s-2)

Options:
A 50 m2 s-2
B 54 m2 s-2
C 51 m2 s-2
D 52 m2 s-2

The correct answer is:
50 m2 s-2

Solution:
Applying continuity equation at 1 and 2, we have
A1V1=A2V2 .....(i)
Further applying Bernoulliâs equation at these two points, we have

P0+pgh+12pv12=P0+0+12pv22 â¦(ii)
Solving Eqs. (i) and (ii), we have
v22=2gh1-A22A12
Substituting the values, we have
v22=2Ã10Ã2.4751-(0.1)2=50 m2 s-2

Topic: Physics, Mechanical Properties of Fluids, NEET
Water is flowing through a channel that is 12 m wide with a speed of 0.75 m s-1. The water then flows into four identical channels that have a width of 4.0 m. The depth of the water does not change as it flows into the four channels. What is the speed of the water in one of the smaller channels?

Options:
A 0.56 m s-1
B 2.3 m s-1
C 0.25 m s-1
D 0.75 m s-1

The correct answer is:
0.56 m s-1

Solution:
Av=A1v1+A2v2+A3v3+A4v4
Av=4A1v1
12×0.75=44×v
v=34× 0.75
=0.75×0.75
v=0.56 m s-1

Topic: Physics, Mechanical Properties of Fluids, NEET
Water is flowing through a tube of non-uniform cross-section. If the radii of the tube at the entrance and exit are in the ratio 3 :2, then the ratio of the velocity of liquid entering and leaving the tube is

Options:
A 1Â :Â 1
B 4 : 9
C 9Â :Â 4
D 8Â :Â 27

The correct answer is:
4 : 9

Solution:
Using equation of continuity
A1v1=A2v2 âÏr12v1=Ïr22v2
âv1v2=r22r12=232=49

Topic: Physics, Mechanical Properties of Fluids, NEET
Water is not required for the act of fertilization in:

Options:
A Cryptogams
B Bryophytes
C Spermatophytes
D Pteridophytes

The correct answer is:
Spermatophytes

Solution:
In spermatophytes, pollen tubes are developed to carry the male gametes to the egg cells for fertilization. In bryophytes, pteridophytes and cryptogams the male gametes are motile and therefore swim in the watery medium (external water) to reach the female gametes, the fusion of which result in fertilization.

Topic: Biology, Plant Kingdom, NEET
Water is used as a coolant in a nuclear reactor because of its

Options:
A high thermal expansion coefficient
B high specific heat capacity
C low density
D low boiling point

The correct answer is:
high specific heat capacity

Solution:
Water is used as a coolant in nuclear reactor because of its high specific heat capacity.

Topic: Physics, Nuclear Physics, NEET, NEET 2024 (Re-NEET)
Water lost in guttation is

Options:
A Pure water
B Impure water
C In the form of vapour form
D Either (Pure water) or (Impure water)

The correct answer is:
Impure water

Solution:
Guttation is the loss or exertion of water in the form of liquid droplets from the leaves and other parts of an uninjured or intact plant. Guttation takes place through special structures called hydathodes. Water lost during guttation contains inorganic and organic components so, it is not pure.

Topic: Biology, Transport in Plants, NEET
Water potential in the leaf tissue is positive (+) during

Options:
A Excessive transpiration
B Low transpiration
C	Excessive absorption
D Guttation

The correct answer is:
Low transpiration

Solution:
The number of water molecules in the system ​determines the water potential, the more water molecules, the greater will be the water potential. The water potential of all solutions is negative in comparison to pure water (water potential is zero). Under the conditions, when there are more water molecules in the system, water potential is expected to be higher, e.g., under conditions of low transpiration in leaf tissue the water potential is expected to be positive. When transpiration is low, considerably more water molecules will be stuffed up inside leaf in the intercellular spaces giving rise to positive water potential.

Topic: Biology, Transport in Plants, NEET
Water potential is equal to

Options:
A Ψw=Ψs+O.P .
B Ψs=T.P.
C Ψs=Ψ p+Ψ w
D Ψw=Ψs+Ψp .

The correct answer is:
Ψw=Ψs+Ψp .

Solution:
Water potential is the difference in the free energy or chemical potential per unit molar volume of water in a system and that of pure water at the same temperature and pressure. Water potential is represented by Greek letter Ψ (psi) or Ψw . Water potential is the sum total of Ψs and Ψp . Therefore, Ψw=Ψs+Ψp

Topic: Biology, Transport in Plants, NEET
Water potential of actively absorbing cells is

Options:
A Always +ve
B Always -ve
C Always 0
D Always >1

The correct answer is:
Always -ve

Solution:
Water potential is regarded as the tendency of water to leave a system. Pure water has the highest possible water potential which is zero. All solutions have water potential lower than that of pure water.

Topic: Biology, Transport in Plants, NEET
Water rises in a vertical capillary tube up to a height of 2.0 cm. If the tube is inclined at an angle of 60Â° with the vertical, then up to what length the water will rise in the tube?

Options:
A 2.0 cm
B 4.0 cm
C 6.0 cm
D 8.0 cm

The correct answer is:
4.0 cm

Solution:
The height up to which water will rise
l=hcosα=2 cmcos60°=4 cm ( h = vertical height, α = angle with verticle )

Topic: Physics, Mechanical Properties of Fluids, NEET
Water rises to a height 'h' in capillary tube. If the length of capillary tube above the surface of water is made less than 'h', then:

Options:
A water rises upto the top of capillary tube and stays there without overflowing.
B water rises upto a point a little below the top and stays there.
C water does not rise at all.
D water rises upto the tip of capillary tube and then starts overflowing like a fountain.

The correct answer is:
water rises upto the top of capillary tube and stays there without overflowing.

Solution:
It won't overflow. That should be obvious since doing so would create a constant flow, constantly using energy, but without any energy input. The same force that pulls the water along the inside of the capillary tube also holds it there when it reaches the end. This force doesn't just pull upward, it pulls the water along the glass. At a certain height, the weight of the water column balances this pull. In that case the pull is upward since there is water below but not above.

Topic: Physics, Mechanical Properties of Fluids, NEET, NEET 2015 (Phase 2)
Water rises to a height of 2 cm in a capillary tube. If the tube is tilted 60Â° from the vertical, water will rise in the tube to a length

Options:
A 4 cm
B 2Â cm
C 1Â cm
D 8Â cm

The correct answer is:
4 cm

Solution:
cosâ¡Î¸=hlâh=l cosâ¡Î¸
l=hcosâ¡Î¸
âl=2cosâ¡60Â°â4 cm

Topic: Physics, Mechanical Properties of Fluids, NEET
Water rises to a height of 16.3 cm in a capillary of height 18 cm. If the tube is cut at a height of 12 cm, then

Options:
A Water will come as a fountain from the capillary.
B Water will stay at a height of 12 cm in capillary
C The height of the water in the tube will be 10.3 cm
D Water will flow down the sides of the capillary tube

The correct answer is:
Water will stay at a height of 12 cm in capillary

Solution:
Due to surface tension property.

Topic: Physics, Mechanical Properties of Fluids, NEET
Water rises upto a height h in a capillary tube of certain diameter. This capillary tube is replaced by a similar tube of half the diameter. Now water will rise to a height of

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

The correct answer is:
2h

Solution:
From capillary tube experiment, We know that
h=2Scosθrρgi.e.h∝1r
∴ h ′ h = r r/ 2 = 2 or h ′ = 2 h

Topic: Physics, Mechanical Properties of Fluids, NEET
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options:

Options:
A Both processes cannot happen simultaneously
B Both processes can happen together because the diffusion coefficient of water and CO2 is different
C The above processes happen only during night time
D One process occurs during day time, and the other at night

The correct answer is:
Both processes can happen together because the diffusion coefficient of water and CO2 is different

Solution:
Water vapour comes out and CO2 diffuses simultaneously through stomatal opening because the diffusion coefficient of water and CO2 is different and it moves along its concentration gradient.

Topic: Biology, Transport in Plants, NEET, NEET 2016 (Phase 1)
Water vascular system is the characteristic of which group of the following?

Options:
A Porifera
B Ctenophora
C Echinodermata
D Chordata

The correct answer is:
Echinodermata

Solution:
From the given options the correct answer is Echinodermata

Topic: Biology, Animal Kingdom, NEET
Water will be absorbed by root hairs when:

Options:
A the concentration of salts in soil is high
B the concentration of solutes in the cell sap is high
C the plant is rapidly transpiring
D they are separated from soil by a semipermeable membrane

The correct answer is:
the concentration of solutes in the cell sap is high

Solution:
The movement of molecules always takes place from a region of higher concentration to a region of lower concentration. The soil has a higher concentration of water as compared to the water in the root hair, this allows the water from the soil to move to the root hair by facilitated diffusion. This process of diffusion and absorption is possible only when the cell sap (the watery fluid in the plant vacuole) has a lower concentration of water and a higher concentration of solute as compared to the root hair so that the root hair absorbs the water.

Topic: Biology, Transport in Plants, NEET
Water-channels are made up of-

Options:
A 4 types of 8 aquaporins
B 8 different aquaporins
C 4 different aquaporins
D 6 types of 8 aquaporins

The correct answer is:
8 different aquaporins

Solution:
the transport protein then rotates and releases the molecule inside the cell, e.g., water channels – made up of eight different types of aquaporins.

Topic: Biology, Transport in Plants, NEET
Water-soluble pigments found in plant cell vacuoles are:

Options:
A Xanthophylls
B Chlorophylls
C Carotenoids
D Anthocyanins

The correct answer is:
Anthocyanins

Solution:
Anthocyanin is stored in vacuoles. They are a type of flavonoid, a class of compounds with antioxidant effects, Found naturally in a number of foods. anthocyanins are the pigments that give red, purple, and blue produced by plants in and stored in vacuoles.

Topic: Biology, Cell - The Unit of Life, NEET, NEET 2016 (Phase 1)
Wave function of an orbital is plotted against the distance from nucleus.

The graphical representation is of

Options:
A 3p
B 2s
C 2p
D 3s

The correct answer is:
3s

Solution:
There are two nodes in the graph, hence, it is for 3s-orbital.
Number of radial nodes = n – l – 1
= 3 – 0 – 1 = 2.

Topic: Chemistry, Structure of Atom, NEET
Wavelength of characteristic X -ray depends on which property of target?

Options:
A A

B Z

C Melting point
D All of these

The correct answer is:
Z

Solution:
Wavelength of characteristic X -ray depends on material used as the metal target (Z)

Topic: Physics, Electromagnetic Waves, NEET
Wavelengths of different radiations are given below Choose the wavelength with least corresponding energy .

Options:
A 300 nm
B 300 m
C 3 nm
D 30 Å

The correct answer is:
300 m

Solution:
Correct Option is : (B)
300 m

Topic: Chemistry, Structure of Atom, NEET
We can produce concentrated/ dilute urine. This is facilitated by a special mechanism. Identify the mechanism.

Options:
A Reabsorption from PCT
B Reabsorption from Collecting Duct
C Reabsorption/ Secretion in DCT
D Countercurrent mechanism in Henle’s loop/ Vasa recta

The correct answer is:
Countercurrent mechanism in Henle’s loop/ Vasa recta

Solution:
Countercurrent mechanism in Henle’s loop/ Vasa recta helps us to produce concentrated/ dilute urine.

Topic: Biology, Excretory Products and their Elimination, NEET
We consider the radiation emitted by the human body. Which one of the following statement is true?

Options:
A The radiation emitted is in the infrared region
B The radiation is emitted only during the day
C The radiation is emitted during the summers and absorbed during the winters
D The radiation emitted lies in the ultraviolet region and hence is not visible

The correct answer is:
The radiation emitted is in the infrared region

Solution:
Every body at all times, at all temperature emit radiation which fall in the infrared region.

Topic: Physics, Thermal Properties of Matter, NEET, NEET 2003
We have a galvanometer of resistance 25 Î©. It is shunted by a 2.5 Î© wire. The part of the total current i0 that flows through the galvanometer is given as

Options:
A ii0=111
B ii0=110
C ii0=19
D ii0=211

The correct answer is:
ii0=111

Solution:
S=igGi-ig⇒ig=iSG+S

i⁡ g⁡ = i⁡ S⁡ G⁡ + S⁡ = i⁡ 0 × 2.5 2 5 + 2.5 = i⁡ 0 11

Topic: Physics, Magnetic Effects of Current, NEET
We have three beakers A, B and C containing glycerin, water and kerosene respectively. They are stirred vigorously and placed on a table. The liquid which comes to rest at the earliest is

Options:
A glycerin
B water
C kerosene
D all of them at the same time

The correct answer is:
glycerin

Solution:
Viscosity of glycerin is greatest among the three liquids and therefore large viscous forces bring it to rest at the earliest.

Topic: Physics, Mechanical Properties of Fluids, NEET
We have two (narrow) capillary tubes T1 and T2. Their lengths are l1 and l2 and radii of the cross-section are r1 and r2 respectively. The rate of water under a pressure difference P through tube T1 is 8 cm3 s-1. If l1 = 2l2 and r1=r2, what will be the rate of flow when the two tubes are connected in series and the pressure difference across the combination is same as before(= P)

Options:
A 4 cm3 s-1

B 163 cm3 s-1

C 817 cm3 s-1
D 8 cm3 s-1

The correct answer is:
163 cm3 s-1

Solution:
V=πPr48ηl=8 cm3 s-1
For composite tube
V1=Pπr48η(l+l2)=23πPr48ηl=23×8=163 cm3 s-1∴l1=l=2l2orl2=l2

Topic: Physics, Mechanical Properties of Fluids, NEET
We wish to observe an object which is 2.5 â« in size. The minimum energy photon that can be used is

Options:
A 5 keV
B 8 keV
C 10 keV
D 12 keV

The correct answer is:
5 keV

Solution:
For scattering to occur, the wavelength of the waves must be of the same order of magnitude or smaller than the size of the object being observed. Hence, the largest possible wavelength we can use in the present problem is λmax=2.5 Å. Hence, minimum energy is
Emin=hvmin=hcλmax=12.40×103 eV.Å2.5 Å=5 keV

Topic: Physics, Atomic Physics, NEET
Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :

Options:
A 18
B 16
C 32
D 30

The correct answer is:
32

Solution:
Sodium hydroxide in the presence of calcium oxide is known as decarboxylating agent. Sodium ethanoate on decarboxylation gives methane.

CH3COONa→NaOH/CaOCH4

The molar mass of methane is 16 g. Weight of two moles of the compound is 32 g.

Topic: Chemistry, Carboxylic Acid Derivatives, NEET, NEET 2023 (All India)
Weight of a body of mass m decreases by 1% when it is raised to a height h above the earth's surface. If the body is taken on depth h in a mine, change in its weight is

Options:
A 0.5%, decrease
B 2%, increase
C 0.5%, increase
D 2%, decrease

The correct answer is:
0.5%, decrease

Solution:
At an altitude h the acceleration due to gravity is
gâ²=g1-2hRe
or mgâ²=mg1-2hRe
ie, wâ²=w1-2hRe
99100w=w1-2hRe
ie, h=0.005Re
At a point below the surface of the earth at depth h. The weight of the body given by
wâ²=w1-hRe
wâ²w=0.995
%âw=1-0.995wwÃ100
%âw=0.5%, decrease

Topic: Physics, Gravitation, NEET
Weight of a person is 800 N. If he runs 4 m on a vertical ladder in 2 s then he needs a power of

Options:
A 3200Â kW
B 3.2 kW
C 1.6Â kW
D zero

The correct answer is:
1.6 kW

Solution:
Power is given by
P=mght=800×42=1600 W

Topic: Physics, Work Power Energy, NEET
Wein's constant is 2892Ã10-6 m K-1 and the value of Î»m for the moon is 14.46 micron. The surface temperature of the moon is

Options:
A 100 K
B 300 K
C 400 K
D 200 K

The correct answer is:
200 K

Solution:
According to Wein's displacement law
λmT=b
T=bλm=2892×10-614.46×10-6
T=200 K

Topic: Physics, Thermal Properties of Matter, NEET
Wein's constant is 2892Ã10-6 m K and the value of Î»m for the moon is 14.46 micron. The surface temperature of the moon is

Options:
A 100 K
B 300 K
C 400 K
D 200 K

The correct answer is:
200 K

Solution:
According to Wein's displacement law
λmT=b
T=bλm=2892×10-614.46×10-6
T=200 K

Topic: Physics, Thermal Properties of Matter, NEET
Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that

Options:
A Darwin was correct
B tail is an essential organ
C mutation theory is wrong
D Lamarckism was wrong in explaining inheritance of acquired characters.

The correct answer is:
Lamarckism was wrong in explaining inheritance of acquired characters.

Solution:
Lamarckism's theory is known as the theory of inheritance. According to this theory, evolution is based upon the use and disuse of organs. He said that organs with maximum use increases in size but without use decreased in size. He explained the giraffe example according to this theory. He said that these characters are then inherited from one generation to the next. Weismann wanted to test this theory. He performed an experiment on mice. He cut the tails of mice generation after generation but saw that this feature was not inherited. Thus, he said that Lamarck's theory on inheritance was wrong.

Topic: Biology, Evolution, NEET
Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?

Options:
A Endemic
B Vulnerable
C Threatened
D Keystone

The correct answer is:
Endemic

Solution:
Endemic species are those species which are confined to a particular region and not found anywhere else. For example, species of Western Ghats. Vulnerable and threatened species are the species which face high risk of extinction. Keystone species are the species whose presence or absence significantly affects other species in an ecosystem.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2019 (Odisha)
Western Ghats have a large number of plants and animal species that are not found any where else. Which of the following term is used to notify such species?

Options:
A Threatened species
B Keystone species
C Endemic species
D Vulnerable species

The correct answer is:
Endemic species

Solution:
Western ghats have large number of endemic species which are absent in all other parts of the world. These consist of amphibians and large number of flowering plants. Westernghats is one of biodiversity hotspots in India.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2022 (Phase 2)
What abbreviations are used for some common alkyl groups?

Options:
A Alkyl groups are not abbreviated.
B Alkyl groups are abbreviated using Greek letters.
C Alkyl groups are abbreviated using numerical prefixes.
D Alkyl groups are abbreviated using specific abbreviations like Me, Et, Pr, and Bu.

The correct answer is:
Alkyl groups are abbreviated using specific abbreviations like Me, Et, Pr, and Bu.

Solution:
Some common alkyl groups are abbreviated as Me (methyl), Et (ethyl), Pr (propyl), and Bu (butyl).

Topic: Chemistry, General Organic Chemistry, NEET
What accompanies growth in a living being?

Options:
A Decreased metabolic processes
B Increased metabolic processes
C No change in metabolic processes
D Inverted metabolic processes

The correct answer is:
Increased metabolic processes

Solution:
Growth is accompanied by metabolic processes (both anabolic and cataboliC) that occur at the expense of energy.

Topic: Biology, Plant - Growth and Development, NEET
What accounts for the formation of Eu2+?

Options:
A The loss of two s electrons
B The presence of a completely filled f subshell
C The strong reducing properties of europium
D The high ionization enthalpy of europium

The correct answer is:
The loss of two s electrons

Solution:
Eu2+ is formed by losing the two s electrons.

Topic: Chemistry, d and f Block Elements, NEET
What accounts for the occurrence of more frequent metal-metal bonding in compounds of heavy transition metals?

Options:
A Low enthalpies of atomisation
B High boiling points
C Greater enthalpies of atomisation
D High volatility

The correct answer is:
Greater enthalpies of atomisation

Solution:
Greater enthalpies of atomisation in heavy transition metals account for the occurrence of more frequent metal-metal bonding in compounds.

Topic: Chemistry, d and f Block Elements, NEET