datavorous/entrance-exam-dataset huggingface dataset:
Why do we prefer to call secondary waste water treatment as biological treatment?

Options:

None

Solution:
In secondary waste water treatment, microorganisms are involved in the breakdown of organic matter in waste water treatment. Thus, it is called biological treatment.
The primary effluent is passed into large aeration tanks where the organic matter present in it is consumed by aerobic microbes, which later themselves are digested by anaerobic bacteria and fungi in digesters with anaerobic sludge.

Topic: Biology, Microbes in Human Welfare
Why is an open system capable of exchanging both energy and matter with the surroundings?

Options:
A It has no physical boundaries
B It has a physical boundary that restricts matter exchange
C It lacks a boundary, allowing unrestricted exchange
D It relies on chemical reactions to exchange energy

The correct answer is:
It lacks a boundary, allowing unrestricted exchange

Solution:
An open system is characterized by the absence of a physical boundary, which enables the unrestricted exchange of both energy and matter.

Topic: Chemistry, Thermodynamics (C), NEET
Why is bimolecular dehydration not appropriate for the preparation of ethyl methyl ether?

Options:
A Ethyl methyl ether is a tertiary ether.
B Ethyl methyl ether has a secondary alkyl group.
C Ethyl methyl ether is a gaseous compound.
D Ethyl methyl ether is highly reactive.

The correct answer is:
Ethyl methyl ether has a secondary alkyl group.

Solution:
The steric hindrance caused by the secondary alkyl group hinders the SN2 reaction required for bimolecular dehydration.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is bromination of anisole an important reaction in organic chemistry?

Options:
A It forms a complex mixture of products
B It is a model reaction for electrophilic aromatic substitution
C It is a method for synthesising alcohols
D It does not involve benzene rings

The correct answer is:
It is a model reaction for electrophilic aromatic substitution

Solution:
Bromination of anisole is a well-studied example of electrophilic aromatic substitution, a fundamental reaction in organic chemistry.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is helium used in diving apparatus?

Options:
A Helium is abundant and cheap.
B Helium is non-reactive and does not form dangerous compounds under high pressure.
C Helium is readily available in underwater environments.
D Helium is a powerful oxidizing agent.

The correct answer is:
Helium is non-reactive and does not form dangerous compounds under high pressure.

Solution:
Correct Option is : (B)
Helium is non-reactive and does not form dangerous compounds under high pressure.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is hydrogen considered a potential source of energy?

Options:
A Because it is the most abundant element in the universe
B Because it can be easily converted into electricity
C Because it forms more compounds than any other element
D Because it can release a large amount of energy when burned or used in fuel cells

The correct answer is:
Because it can release a large amount of energy when burned or used in fuel cells

Solution:
Hydrogen is considered a potential source of energy because it can release a large amount of energy when burned or used in fuel cells, making it a promising candidate for clean and efficient energy production.

Topic: Chemistry, Hydrogen, NEET
Why is it necessary to consider the existence of isotopes and their relative abundances when calculating the average atomic mass of an element?

Options:
A To determine the most common isotope
B To identify the heaviest isotope
C To account for variations in atomic mass within the element
D To simplify the calculation process

The correct answer is:
To account for variations in atomic mass within the element

Solution:
Considering the existence of isotopes and their relative abundances is necessary to calculate the average atomic mass of an element, as it accounts for variations in atomic mass within the element.

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Why is it not possible to draw a boundary surface diagram that bounds a region with a 100% probability of finding the electron?

Options:
A Because the probability density |ψ|² is zero at any finite distance from the nucleus.
B Because the probability density |ψ|² has some value, no matter how small, at any finite distance from the nucleus.
C Because the shape of orbitals is not well-defined.
D Because the size of the orbitals is too small to represent visually.

The correct answer is:
Because the probability density |ψ|² has some value, no matter how small, at any finite distance from the nucleus.

Solution:
The probability density |ψ|² always has some value, no matter how small, at any finite distance from the nucleus, so it's not possible to draw a boundary surface diagram with a 100% probability region.

Topic: Chemistry, Structure of Atom, NEET
Why is it that during changing weather, one is advised to avoid closed, crowded and air conditioned places like cinema halls etc?

Options:

None

Solution:
Changing of seasons are the times when infectious agents are more abundant as in moist condition pathogens grow fast. People are more vulnerable as their body system is adapting to the changing environmental conditions of temperature and humidity. Thus they are more prone to pathogen infection.

Topic: Biology, Human Health and Diseases
Why is mother's milk considered essential for a newborn infant?

Options:
A It has abundant antibodies (IgA) to protect the infant
B It is yellowish fluid
C It is secreted by mother during the initial days of lactation
D It is the only source of nutrition for the infant

The correct answer is:
It has abundant antibodies (IgA) to protect the infant

Solution:
Mother's milk is considered essential for a newborn infant because it has abundant antibodies (IgA) to protect the infant.

Topic: Biology, Human Health and Diseases, NEET
Why is nitrogen a limiting nutrient for natural and agricultural ecosystems?

Options:
A Nitrogen is abundant in soil
B Nitrogen is not a constituent of amino acids, proteins, hormones, chlorophylls and vitamins
C Nitrogen is not a limiting nutrient for natural and agricultural ecosystems
D Nitrogen is a limiting nutrient for both natural and agricultural eco-systems as plants compete with microbes for the limited nitrogen available in soil.

The correct answer is:
Nitrogen is a limiting nutrient for both natural and agricultural eco-systems as plants compete with microbes for the limited nitrogen available in soil.

Solution:
Nitrogen is a limiting nutrient for both natural and agricultural eco-systems as plants compete with microbes for the limited nitrogen that is available in soil.

Topic: Biology, Mineral Nutrition, NEET
Why is RuBisCO the most abundant enzyme in the world?

Options:
A It has a much greater affinity for O₂ than CO₂
B It has a much greater affinity for CO₂ when the CO₂:O₂ is nearly equal
C It is the only enzyme that can catalyse the reaction between RuBP and CO₂
D It has a much greater affinity for CO₂ than O₂

The correct answer is:
It has a much greater affinity for CO₂ when the CO₂:O₂ is nearly equal

Solution:
RuBisCO is the most abundant enzyme in the world because it has a much greater affinity for CO₂ when the CO₂:O₂ is nearly equal, which is the characteristic that makes it so abundant.

Topic: Biology, Photosynthesis in Higher Plants, NEET
Why is the equilibrium between ice and water described as dynamic?

Options:
A Because there is no activity at the boundary between ice and water.
B Because the temperature is constantly changing.
C Because both opposing processes occur simultaneously.
D Because there is a change in the mass of ice and water.

The correct answer is:
Because both opposing processes occur simultaneously.

Solution:
In dynamic equilibrium, both opposing processes occur simultaneously.

Topic: Chemistry, Chemical Equilibrium, NEET
Why is zinc not extracted from zinc oxide through reduction using \(\mathrm{CO}\) ?

Options:

None

Solution:
This is because the standard free energy of formation of \(\mathrm{CO}_2\) from \(\mathrm{CO}\) is higher than that of standard free energy of formation of \(\mathrm{ZnO}\) from \(\mathrm{Zn}\).

Topic: Chemistry, General Principles and Processes of Isolation of Metals
Why should not medicines be taken without consulting doctors?

Options:
A Doctors need to be consulted for insurance purposes
B Medicines may have side effects or interact with other drugs
C Doctors need to know which medicines are popular
D Medicines are not effective without a doctor's recommendation

The correct answer is:
Medicines may have side effects or interact with other drugs

Solution:
Correct Option is : (B)
Medicines may have side effects or interact with other drugs

Topic: Chemistry, Chemistry in Everyday Life, NEET
Wind pollinated flowers are

Options:
A Small, brightly coloured, producing large number of pollen grains
B Small, producing large number of dry pollen grains
C Large, producing abundant nectar and pollen
D Small, producing nectar and dry pollen

The correct answer is:
Small, producing large number of dry pollen grains

Solution:
Pollination by wind is called anemophily, and such plants in which pollination occurs by wind are called anemophilous plants. Anemophilous plants are characterized by small flowers, pollens present in large numbers which are small, dry and light in weight. Numerous ovules are generally reduced in the ovary, and they have feathery or brushy stigma (to receive the pollen). Grasses and palms are generally anemophilous.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Wind pollinated flowers are

Options:
A small, brightly coloured, producing large number of pollen grains
B small, producing large number of dry pollen grains
C large, producing abundant nectar and pollen
D small, producing nectar and dry pollen

The correct answer is:
small, producing large number of dry pollen grains

Solution:
Pollination taking place by means of wind is known as anemophily, eg, Zea mays, Cannabis, Pinus, etc. Some features of wind pollinated flowers are-
(i) Non-essential whorls such as calyx, corolla and bracts, bracteoles are not showy.
(ii) The perianth lobes are undeveloped or reduced and sometimes absent.
(iii) Flowers are devoid of scent and nectars.
(iv) Plants produce a very large quantity of dusty pollen grains.
(v) Pollen grains are dry, very small sized, non-sticky and unwettable These features are helpful for individuality of pollen grains.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2010 (Screening)
Wind pollinated flowers are

Options:
A small, brightly coloured, producing large number of pollen grains.
B small, producing a large number of dry pollen grains, feathery stigma.
C large, producing abundant nectar and pollen.
D small, nectar producing, pollen are dry.

The correct answer is:
small, producing a large number of dry pollen grains, feathery stigma.

Solution:
Pollination by wind is called anemophily and such plants in which pollination occurs by wind are called anemophilous plants. Anemophilous plants are characteristized by small flowers, pollens present in large number which are small, dry and light in weight number of ovules generally reduced in ovary (biological significance), feathery or brushy stigma (to receive the pollen). Grasses and palms are generally anemophilous.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
With a standard rectangular bar magnet of length (l), breadth $(b ; b< < l)$ and magnetic moment $M$, the time period of the magnet in a vibration magnetometer is $4 \mathrm{~s}$. If the magnet is cut normal to its length into four equal pieces, the time period (in seconds) with one of the pieces is

Options:
A 16
B 2
C 1
D $1 / 4$

The correct answer is:
1

Solution:
Time period of magnet in vibration magnetometer,
$T=2 \pi \sqrt{\frac{1}{M H}}$
where, $I=$ moment of inertia of magnet
$M=$ magnetic moment
$H=$ horizontal component of earth's magnetic field
$\begin{aligned}
& \therefore \quad \frac{T_1}{T_2}=\sqrt{\frac{I_1}{I_2} \cdot \frac{M_2}{M_1}} \\
& \Rightarrow \quad \frac{4}{T_2}=\sqrt{\frac{m l^2 / 12}{m / 4(l / 4)^2 / 12}} \\
& =\sqrt{\frac{4 \times 16 \times 12}{12 \times 4}}=\sqrt{16} \\
& \Rightarrow \quad \frac{4}{T_2}=4 \\
& \therefore \quad T_2=1 \mathrm{~s} \\
&
\end{aligned}$

Topic: Physics, Oscillations, AP EAMCET, AP EAMCET 2005
With a standard rectangular bar magnet of length (l), breadth $(b ; b< < l)$ and magnetic moment $M$, the time period of the magnet in a vibration magnetometer is $4 \mathrm{~s}$. If the magnet is cut normal to its length into four equal pieces, the time period (in seconds) with one of the pieces is

Options:
A 16
B 2
C 1
D $1 / 4$

The correct answer is:
1

Solution:
Time period of magnet in vibration magnetometer,
$T=2 \pi \sqrt{\frac{1}{M H}}$
where, $I=$ moment of inertia of magnet
$M=$ magnetic moment
$H=$ horizontal component of earth's magnetic field
$\begin{aligned}
& \therefore \quad \frac{T_1}{T_2}=\sqrt{\frac{I_1}{I_2} \cdot \frac{M_2}{M_1}} \\
& \Rightarrow \quad \frac{4}{T_2}=\sqrt{\frac{m l^2 / 12}{m / 4(l / 4)^2 / 12}} \\
& =\sqrt{\frac{4 \times 16 \times 12}{12 \times 4}}=\sqrt{16} \\
& \Rightarrow \quad \frac{4}{T_2}=4 \\
& \therefore \quad T_2=1 \mathrm{~s} \\
&
\end{aligned}$

Topic: Physics, Oscillations, TS EAMCET, TS EAMCET 2005
With a standard rectangular bar magnet the time period of a vibration magnetometer is $4 \mathrm{~s}$. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second) (bar magnet breadth is small) is

Options:
A $16$
B $8$
C $4$
D $2$

The correct answer is:
$4$

Solution:
Time period of magnet, $T=2 \pi \sqrt{\frac{I}{M B}}$
When magnet is cut parallel to its length into four equal pieces. Then new magnetic moment, $M^{\prime}=\frac{M}{4}$
New moment of inertia, $I^{\prime}=\frac{I}{4}$
$\therefore \quad$ New time period, $T^{\prime}=2 \pi \sqrt{\frac{I^{\prime}}{M^{\prime} B}}$
$\Rightarrow \quad T=T^{\prime}=4 \mathrm{~s}$

Topic: Physics, Magnetic Properties of Matter, TS EAMCET, TS EAMCET 2008
With a standard rectangular bar magnet the time period of a vibration magnetometer is $4 \mathrm{~s}$. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second) (bar magnet breadth is small) is

Options:
A $16$
B $8$
C $4$
D $2$

The correct answer is:
$4$

Solution:
Time period of magnet, $T=2 \pi \sqrt{\frac{I}{M B}}$
When magnet is cut parallel to its length into four equal pieces. Then new magnetic moment, $M^{\prime}=\frac{M}{4}$
New moment of inertia, $I^{\prime}=\frac{I}{4}$
$\therefore \quad$ New time period, $T^{\prime}=2 \pi \sqrt{\frac{I^{\prime}}{M^{\prime} B}}$
$\Rightarrow \quad T=T^{\prime}=4 \mathrm{~s}$

Topic: Physics, Magnetic Properties of Matter, AP EAMCET, AP EAMCET 2008
With a standard rectangular bar magnet, the time period of a vibration magnetometer is 4 s. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second) (bar magnet breadth is small) is

Options:
A 16
B 8
C 4
D 2

The correct answer is:
4

Solution:
The time period of the magnet, T=2πIMB
When the magnet is cut parallel to its length into four equal pieces.

Then new Magnetic moment, M'=M4
New moment of inertia, I'=I4
∴ New time period T=2πIMB
⇒T=T'=4 s

Topic: Physics, Magnetic Effects of Current, NEET
With the decrease of current in the primary coil from 2 amperes to zero value in \(0.01 \mathrm{~s}\) the emf generated in the secondary coil is 1000 volts. The mutual inductance of the two coils is

Options:
A \(1.25 \mathrm{~H}\)
B \(2.50 \mathrm{~H}\)
C \(5.00 \mathrm{~H}\)
D \(10.00 \mathrm{~H}\)

The correct answer is:
\(5.00 \mathrm{~H}\)

Solution:
Induced \(\operatorname{emf} \varepsilon=\frac{-M d I_P}{d t}\)
Where \(M\) is the mutual inductance of two coils and \(\frac{d I_P}{d t}\) is the rate of change of current in the primary.
\(\begin{aligned}
& \therefore \quad 1000 \mathrm{~V}=\frac{-M(0 \mathrm{~A}-2 \mathrm{~A})}{0.01 \mathrm{~s}} \\
& \text { or } M=\frac{(1000 \mathrm{~V})(0.01 \mathrm{~s})}{(2 \mathrm{~A})}=5 \mathrm{H} .
\end{aligned}\)

Topic: Physics, Electromagnetic Induction, AIIMS, AIIMS 2007
Wound healing is due to

Options:
A ventral meristem
B secondary meristem
C primary meristem
D All of these

The correct answer is:
ventral meristem

Solution:
Secondary meristem are the meristem that are formed secondarly from the permanent tissue. Healing of wound in plant take place by the activity of secondary meristem.

Topic: Biology, Anatomy of Flowering Plants, JIPMER, JIPMER 2013
Write down the converse of following statements:
(i) If a rectangle ' $R$ ' is square, then $R$ is rhombus.
(ii) If today is Monday, then tomorrow is Tuesday.
(iii) If you go to Agra, then you must visit Taj Mahal.
(iv) If the sum of squares of two sides of a triangle is equal to the square of third side of a triangle, then the triangle is right angled.
(v) If all three angles of a triangle are equal, then the triangle is equilateral.
(vi) If $x: y=3: 2$, then $2 x=3 y$.
(vii) If $S$ is a cyclic quadrilateral, then the opposite angles of $\mathrm{S}$ are supplementary.
(viii) If $x$ is zero, then $x$ is neither positive nor negative.
(ix) If two triangles are similar, then the ratio of their corresponding sides are equal.

Options:

None

Solution:
(i) If the rectangle $R$ is rhombus then it is square.
(ii) If tomorrow is Tuesday then today is Monday.
(iii) If you must visit Taj Mahal you go to Agra.
(iv) If the triangle is right angle then sum of squares of two sides of a triangle is equal to the square of third side.
(v) If the triangle is equilateral then all three angles of the triangle are equal.
(vi) If $2 x=3 y$ then $x: y=3: 2$
(vii) If the opposite angles of $S$ are supplementary then $S$ is a cyclic quadrilateral.
(viii) If $\mathrm{x}$ neither positive nor negative than $\mathrm{x}$ is 0 .
(ix) If the ratio of corresponding sides of two triangles are equal then triangles are similar.

Topic: Mathematics, Mathematical Reasoning