datavorous/entrance-exam-dataset huggingface dataset:
Which of the glycosidic linkage between galactose and glucose is present in lactose?

Options:
A C-1 of glucose and C-4 of galactose
B C-1 of glucose and C-6 of galactose
C C-1 of galactose and C-4 of glucose
D C-1 of galactose and C-6 of glucose

The correct answer is:
C-1 of galactose and C-4 of glucose

Solution:
Lactose is composed of a molecule of galactose joined to a molecule of glucose by a β-1,4-glycosidic linkage. It is a reducing sugar that is found in milk.

In lactose linkage is formed between C1 of galactose and C4 of glucose.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2021 (25 Feb Shift 1)
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?

Options:
A

B

C

D

The correct answer is:

Solution:
An electron will be emitted only when the frequency of light is more than the threshold frequency. As the frequency increases, K.E will increase linearly. The graph will be a straight line not passing through origin hence this is not a correct representation. So, this is the correct option.
The number of emitted electrons will depend upon the number of the photons but not on the energy and frequency of the photons.

Topic: Chemistry, Structure of Atom, JEE Main, JEE Main 2019 (10 Jan Shift 1)
Which of the group element does not form M(III) iodide?

Options:
A Al
B Ga
C In
D Tl

The correct answer is:
Tl

Solution:
Due to inert pair effect, Tl prefers its +1 oxidation state while bonding with iodine and TlIform. Although thallium (Tl) form TlI3, but the O.S. of thallium is +1 in this compound, because iodine is present as tri-iodide ion I3-.

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which of the oxide groups among the following cannot be reduced by carbon?

Options:
A
$\mathrm{Cu}_2 \mathrm{O}, \mathrm{SnO}_2$

B
$\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$

C
$\mathrm{PbO}, \mathrm{Fe}_2 \mathrm{O}_4$

D
$\mathrm{Fe}_2 \mathrm{O}_3, \mathrm{ZnO}$

The correct answer is:
$\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$

Solution:
$\mathrm{Ca}$ and $\mathrm{K}$ are strong reducing agents, hence their oxides can not be reduced with carbon.

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which of the oxide groups among the following cannot be reduced by carbon?

Options:
A
$\mathrm{Cu}_2 \mathrm{O}, \mathrm{SnO}_2$

B
$\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$

C
$\mathrm{PbO}, \mathrm{Fe}_2 \mathrm{O}_4$

D
$\mathrm{Fe}_2 \mathrm{O}_3, \mathrm{ZnO}$

The correct answer is:
$\mathrm{CaO}, \mathrm{K}_2 \mathrm{O}$

Solution:
$\mathrm{Ca}$ and $\mathrm{K}$ are strong reducing agents, hence their oxides can not be reduced with carbon.

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main, JEE Main 2012 (07 May Online)
Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution?

Options:
A HPO3n
B H4P2O5
C H4P2O6
D H4P2O7

The correct answer is:
H4P2O5

Solution:
The oxyacid HPO3n has different structures based on the value of n. If n=3,

The oxyacid H2P2O5 has the following structure.

The structures of the H4P2O6 and H4P2O7 are

Oxyacid having P-H bond can reduce AgNO3 to
Ag. Hence, H4P2O5 can create silver mirror with silver nitrate.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main, JEE Main 2023 (24 Jan Shift 1)
Which of the plots is adsorption isobar for chemisorption?

Options:
A
B
C
D

The correct answer is:

Solution:
chemisorption involves a high activation energy. so, it first increases and then decreases with increase in temperature. The initial increase is due to the heat supplied which act as activation energy required in chemisorption but later it decreases due to exothermic nature of adsorption at equilibrium.

Topic: Chemistry, Surface Chemistry, JEE Main
Which of the plots shown in the figure represents speed $(v)$ of the electron in a hydrogen atom as a function of the principal quantum number $(n)$ ?

Options:
A
$B$

B
$D$

C
$C$

D
$A$

The correct answer is:
$B$

Solution:
Velocity of electron in $n^{\text {th }}$ orbit of hydrogen atom is given by :
$$
V_n=\frac{2 \pi K Z e^2}{n h}
$$
Substituting the values we get,
$$
V_n=\frac{2.2 \times 10^6}{n} \mathrm{~m} / \mathrm{s} \quad \text { or } \quad V_n \propto \frac{1}{n}
$$
As principal quantum number increases, velocity decreases.

Topic: Physics, Atomic Physics, JEE Main, JEE Main 2012 (26 May Online)
Which of the reaction is suitable for concentrating ore by leaching process?

Options:
A 2Cu2 S+3O2→2Cu2O+2SO2
B Fe3O4+CO→3FeO+CO2
C Al2O3+2NaOH+3H2O→2NaAlOH4
D Al2O3+6Mg→6MgO+4Al

The correct answer is:
Al2O3+2NaOH+3H2O→2NaAlOH4

Solution:
Leaching: It involves the treatment of the ore with a suitable reagent as to make it soluble while impurity remains insoluble and after this, the ore is recovered from the solution by suitable methods.

The principal ore of aluminium and bauxite usually contain SiO2, iron oxides and titanium oxides as impurities.

Al2O3 s+2NaOH aq+3H2O→2NaAlOH4 aq2NaAlOH4 aq+CO2 g→Al2O3·xH2O s+2NaHCO3 aq

The sodium silicate remains in the solution and hydrated alumina is filtered, dried and heated to give pure Al2O3.

Al2O3·xH2O s→1470 KAl2O3 s+xH2O g

Topic: Chemistry, General Principles and Processes of Isolation of Metals, JEE Main, JEE Main 2022 (28 Jul Shift 1)
Which of the statement is wrong among the following

Options:
A Haber's process of $\mathrm{NH}_3$ requires iron as catalyst
B Friedel-Craft's reaction uses anhydrous$\mathrm{AlCl}_3$
C Hydrogenation of oils uses iron as catalyst
D Oxidation of $\mathrm{SO}_2$ to $\mathrm{SO}_3$ requires $\mathrm{V}_2 \mathrm{O}_5$

The correct answer is:
Oxidation of $\mathrm{SO}_2$ to $\mathrm{SO}_3$ requires $\mathrm{V}_2 \mathrm{O}_5$

Solution:
The catalytic oxidation of $\mathrm{SO}_2$ is done by passing warm $\mathrm{SO}_2$ bearing gas over horizontal beads of $V, K, N a, \mathrm{Cs}, \mathrm{SiO}_2$ catalyst.

Topic: Chemistry, Surface Chemistry, JEE Main
Which of the statements about anhydrous aluminium chloride is correct

Options:
A It exists as $\mathrm{AlCl}_3$ molecule
B It is not easily hydrolysed
C It sublimes at $100^{\circ} \mathrm{C}$ under vacuum
D It is a strong Lewis base

The correct answer is:
It sublimes at $100^{\circ} \mathrm{C}$ under vacuum

Solution:
it sublimes at $100^{\circ} \mathrm{C}$ under vacuum
The above statement is true. It sublimates at $100^{\circ} \mathrm{C}$, but in vacuum.

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which of the statements about 'Denaturation' given below are correct?
Statements
(A) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(B) Denaturation leads to the conversion of double strand of DNA into single strand.
(C) Denaturation affects primary structure which gets destroyed.

Options:
A (B) and (C)
B (A) and (C)
C (A) and (B)
D (A), (B) and (C)

The correct answer is:
(A) and (B)

Solution:
During denaturation secondary and tertiary structures of protein destroyed but primary structure remains intact.
Heat, acid and alkali denature DNA molecule and double strand of DNA converts into single strand.

Topic: Chemistry, Biomolecules, NEET, NEET 2011 (Mains)
Which of the statements about 'Denaturation' given below are correct? Statements
(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(b) Denaturation leads to the conversion of double strand of DNA into single strand.
(c) Denaturation affects the primary structure which gets distorted

Options:
A (b) and (c)
B (a) and (c)
C (a) and (b)
D (a), (b) and (c)

The correct answer is:
(a) and (b)

Solution:
During denaturation, the secondary and tertiary structures of protein destroyed but primary structures remains intact.

The structure of the natural proteins is responsible for their biological activity. These structures are maintained by various attractive forces between different parts of the polypeptide chains. The breaking of these forces by a physical or a chemical change makes the proteins to lose all or part of their biological activity. This is called denaturation of proteins. The denaturing of proteins can be done by adding chemicals such as acids, bases, organic solvents, heavy metal ions, or urea. It can also be done with the help of heat and ultraviolet light. Denaturation can be irreversible or reversible. In irreversible denaturation, the denaturated protein does not return to its original shape. For example, the heating of white of an egg(water soluble) gives a hard and rubbery insoluble mass.

Topic: Chemistry, Biomolecules, JEE Main
Which of the statements about 'Denaturation' given below are correct?
Statements:
(i) denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(ii) Denaturation leads to the conversion of double strand of DNA into single strand'.
(iii) Denaturation affects primary structure which gets destroyed.

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

The correct answer is:
(i) and (iii)

Solution:
In the process denaturation secondary and tertiary structures of protein destroyed but primary structure remainsundisturbed. Heat, acid and alkali denature DNA molecule and double strand of DNA converts into single strand.

Topic: Chemistry, Biomolecules, VITEEE, VITEEE 2012
Which of the statements about human respiratory system is INCORRECT?

Options:
A Trachea is made up of 16-20 C shaped hyaline cartilaginous rings and is lined by pseudostratified ciliated columnar epithelium.
B The amount of air which is present in the conducting part of respiratory system is 150 ml.
C The partial pressure of oxygen in inspired air is equal to partial pressure of oxygen in alveolar air.
D Humans have two pairs of vocal cords out of which only one pair helps in production of sound.

The correct answer is:
The partial pressure of oxygen in inspired air is equal to partial pressure of oxygen in alveolar air.

Solution:
Transport of gases depend on partial pressure of gases and also on Boyle's law. This means Pressure is inversely proportional to Volume when temperature remains constant. Thus gases transport from high pressure to low pressure. Oxygen is inhaled into the lungs from the atmosphere and thus partial pressure of oxygen is more in atmosphere and less in alveoli. Tidal volume is amount of air inhaled or exhaled in one breath and is 500ml out of which 350 ml is anatomic dead space. Trachea is made up of 16-20 shaped c shaped cartilaginous rings. Humans have two pairs of vocal cords: True and False and only true pair helps in production of sound.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the statements are the drawbacks of Rutherford's model of an atom?

Options:
A Any particle in a circular orbit would undergo a acceleration and the charged particles would radiate energy
B The revolving electron would lose energy and finally fall into the nucleus
C The orbital revolution of the electron is not expected to be stable
D All of the above

The correct answer is:
All of the above

Solution:
The drawback of Rutherford model is: It can't explain the stability of an atom. As per the model, the orbital revolution of electrons around the nucleus is not stable as the revolving electrons in orbits will undergo acceleration and emit energy.

Topic: Physics, Atomic Physics, JEE Main
Which of the statements is not a fallacy?

Options:
A \( p \wedge(\sim(\sim p \Rightarrow \sim q)) \)
B \( \sim((p \wedge \sim q) \Rightarrow p) \)
C \( \sim(p \Rightarrow(p \vee \sim q)) \)
D \( \sim p \vee(\sim p \Rightarrow \sim q) \)

The correct answer is:
\( \sim p \vee(\sim p \Rightarrow \sim q) \)

Solution:
A Option A is true only if p is true and ∼p⇒∼q is false which can never be possible, hence A is a fallacy
∴s→t is a tautology, if s is subset of t
B p∧∼q is a subset of p, hence p∧∼q⇒p is a tautology, hence ∼p∧∼q⇒p is a fallacy
C p is a subset of p∨~q, hence p⇒p∨∼q is a tautology, hence ∼p⇒p∨∼q is a fallacy
D Option D is the negation of option A, hence D is a tautology

Topic: Mathematics, Mathematical Reasoning, JEE Main
Which of the statements is not a fallacy?

Options:
A pâ§â¼â¼p⇒â¼q
B â¼pâ§â¼q⇒p
C â¼p⇒pâ¨â¼q
D â¼pâ¨â¼pââ¼q

The correct answer is:
∼p∨∼p⇒∼q

Solution:
A Option A is true only if p is true and ∼p⇒∼q is false which can never be possible, hence A is a fallacy
∴s→t is a tautology, if s is subset of t
B p∧∼q is a subset of p, hence p∧∼q⇒p is a tautology, hence ∼p∧∼q⇒p is a fallacy
C p is a subset of p∨~q, hence p⇒p∨∼q is a tautology, hence ∼p⇒p∨∼q is a fallacy
D Option D is the negation of option A, hence D is a tautology

Topic: Mathematics, Mathematical Reasoning, JEE Main
Which of the vitamins given below is water soluble?

Options:
A Vitamin K
B Vitamin C
C Vitamin D
D Vitamin E

The correct answer is:
Vitamin C

Solution:
B complex vitamins and vitamin C are water-soluble vitamins that are not stored in the body and must be replaced each day.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2015 (04 Apr)
Which of these canals are correctly matched with the organ that they are located in?

I. Central canal: Vertebral column

II. Neural canal: Spinal cord

III. Canal of Schlemn: Eye

IV. Semicircular canal: Ear

Options:
A I, II and IV
B I and II
C III and IV
D I, II, III and IV

The correct answer is:
III and IV

Solution:
Neural canal is a cavity within the vertebral column. Spinal cord is present within the neural canal. Central Canal or neurocoel is the cavity of the spinal cord which contains CSF. Semicircular canals are present in the internal ear. They have receptors called crista ampullaris which are responsible for maintenance of body posture and balance (equilibrium). Canal of Schlemm in the sclerocorneal junction of the eye. The aqueous humor of the eye ultimately drains from the Canal of Schlemm into the venous blood

Topic: Biology, Neural Control and Coordination, NEET
Which of these cannot be related to biotechnology?

Options:
A Integration of natural science and organisms.
B Techniques to alter the chemistry of DNA.
C Introduction of undesirable genes into the target organisms.
D Maintenance of sterile ambience to enable the growth of only the desired microbes.

The correct answer is:
Introduction of undesirable genes into the target organisms.

Solution:
Biotechnology deals with the techniques of using live microorganisms, plants or animal cells or their components or enzymes from organisms to produce products and processes useful to human beings. It includes DNA manipulation, gene manipulation, recombinant DNA technology and genetic engineering. It also includes techniques to alter the chemistry of DNA. It also includes introduction of desirable genes into the target organisms and thus new products can be synthesized.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which of these compounds are aromatic in character?

Options:
A
B
C
D All of these

The correct answer is:
All of these

Solution:
All these species are aromatic in nature as per as the conditions of aromaticity as follows

Topic: Chemistry, General Organic Chemistry, JEE Main
Which of these do not form Grignard reagent

Options:
A $\mathrm{CH}_3 \mathrm{~F}$
B $\mathrm{CH}_3 \mathrm{Cl}$
C $\mathrm{CH}_3 \mathrm{Br}$
D $\mathrm{CH}_3 \mathrm{l}$

The correct answer is:
$\mathrm{CH}_3 \mathrm{~F}$

Solution:
The $C-F$ bond energy is maximum in $\mathrm{CH}_3 F$. Thus fluoride is the less reactive to form the grignard reagent with $M g$.

Topic: Chemistry, Haloalkanes and Haloarenes, JEE Main
Which of these does not influence the rate of reaction

Options:
A Nature of the reactants
B Concentration of the reactants
C Temperature of the reaction
D Molecularity of the reaction

The correct answer is:
Molecularity of the reaction

Solution:
Molecularity of the reaction does not influence the rate of reaction.

Topic: Chemistry, Chemical Kinetics, JEE Main
Which of these does not reflect the periodicity of the elements

Options:
A Bonding behaviour
B Electronegativity
C Ionization energy
D $\frac{\text{Neutron}}{\text{proton}}$ ratio

The correct answer is:
$\frac{\text{Neutron}}{\text{proton}}$ ratio

Solution:
$\frac{\text{Neutron}}{\text{proton}}$ ratio is a cause of radioactivity.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of these factors does not govern the stability of a conformation in acyclic compounds?

Options:
A Steric interactions
B Angle strain
C Torsional strain
D Electrostatic forces of interaction

The correct answer is:
Angle strain

Solution:
In acyclic compound torsional, steric and Van der wall's strains are present
In cyclic compound angle strain is found due to ring. Hence, in acyclic compounds angle strain does not govern the stability of a confirmation.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2019 (10 Apr Shift 2)
Which of these hormones decrease the amount of sodium lost by the body through urine?

Options:
A ANF
B Aldosterone
C Parathormone
D Vasopressin

The correct answer is:
Aldosterone

Solution:
Adrenal cortex secretes many hormones collectively known as Corticoids. The Corticoids which help to maintain water and electrolyte balance in our body are known as Mineralocorticoids. Aldosterone is the most important mineralocorticoid in our body. This hormone acts on kidneys and enhances reabsorption of sodium and water in order to decrease their excretion. Hence if levels of Aldosterone decreases, sodium and water will be excreted from the body.

Topic: Biology, Chemical Coordination and Integration, NEET
Which of these hormones may have a primary role in maintaining the circadian rhythm?

Options:
A Insulin
B Estradiol
C Melatonin
D Epinephrine

The correct answer is:
Melatonin

Solution:
Circadian rhythm is a 24-hour sleep-wake cycle. It is controlled by hormone melatonin. Melatonin is secreted by pineal gland. This gland is attached via a stalk with the epithalamus and hence it is also known as epiphysis. It is also known as the third eye as this gland is present at the axis traced from the third eye. Melatonin secretion depends on light. It increases due to darkness and decreases due to light.

Topic: Biology, Chemical Coordination and Integration, NEET
Which of these is a discrepancy of the five-kingdom classification?

I. Fungi get the status of a kingdom.
II. Viruses have no place, in five-kingdom system.
III. Kingdom Protista includes both autotrophic and heterotrophic organisms.
IV. Prokaryotes are separated from eukaryotes.

Options:
A II and III
B I and II
C III and IV
D II, III and IV

The correct answer is:
II and III

Solution:
The main aim of classification is to group similar organisms together. In the five-kingdom classification given by Whittaker, prokaryotes are separated from eukaryotes and fungi, which were earlier placed in the plant kingdom, were placed in a separate kingdom as they are saprophytes. However, viruses that are non-cellular have not been given any place in this classification. Also, all unicellular eukaryotes having diverse properties have been placed under the kingdom Protista. They contain autotrophic, heterotrophic and saprophytic protists. This is a demerit of this system.

Topic: Biology, Biological Classification, NEET
Which of these is not a function of the gaseous hormone?

Options:
A Initiation of flowering and synchronization of fruit-set in pineapples
B Promotion of male flowers in cucumbers thereby increasing its yield
C Breaking the bud dormancy and promoting sprouting of potato tubers
D Promotion of root growth and root hair formation, thus helping the plants to increase their absorption surface.

The correct answer is:
Promotion of male flowers in cucumbers thereby increasing its yield

Solution:
Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds, sprouting of potato tubers. Ethylene promotes rapid internode/petiole elongation in deep water rice plants. It helps leaves/ upper parts of the shoot to remain above water. Ethylene also promotes root growth and root hair formation, thus helping the plants to increase their absorption surface. Ethylene is used to initiate flowering and for synchronizing fruit-set in pineapples. It also induces flowering in mango. It promotes female flowers in cucumbers thereby increasing the yield.

Topic: Biology, Plant - Growth and Development, NEET
Which of these is not an important component of initiation of parturition in humans?

Options:
A Increase in estrogen and progesterone ratio
B Synthesis of prostaglandins
C Release of oxytocin
D Release of prolactin

The correct answer is:
Release of prolactin

Solution:
Prolactin has no role in parturition, it helps in lactation process, (lactogenic hormone), development of mammary glands (mammotropin) & maintenance of corpus luteum (leutotropin).

Topic: Biology, Human Reproduction, NEET, NEET 2015 (Phase 1)
Which of these is not an important component of initiation of parturition in humans?

Options:
A Increase in estrogen and progesterone ratio
B Synthesis of prostaglandins
C Release of oxytocin
D Release of prolactin

The correct answer is:
Release of prolactin

Solution:
Prolactin has no role in parturition, it helps in lactation process, (lactogenic hormone), development of mammary glands (mammotropin) & maintenance of corpus luteum (leutotropin).

Topic: Biology, Human Reproduction, NEET
Which of these is used to control human population?

Options:
A Estrogen + progesterone
B IUCD and MTP
C Tubectomy and vasectomy
D All of the above

The correct answer is:
All of the above

Solution:
To control the human population many birth control methods can be used, such as hormonal method, i.e., use of contraceptive pills (estrogen and progesterone are main constituents), mechanical prevention method, i.e., use of IUCDs (Intrauterine Contraceptive Device), surgical sterilization methods,like tubectomy (surgical removal of fallopian tubules) or vasectomy (surgical removal of vas deferens).

Topic: Biology, Reproductive Health, JIPMER, JIPMER 2012
Which of these materials requires the least value of magnetic field strength to magnetize it?

Options:
A Nickel
B Silver
C Tungsten
D Sodium Chloride

The correct answer is:
Nickel

Solution:
The least value of magnetic field strength required to magnetize is nickel because it is a ferromagnetic material. Ni is a ferromagnetic substance which gets strongly magnetized when placed in an external magnetic field. When external magnetic field B0, is applied the magnetic domains orient themselves in the direction of magnetic filed and grow in size.
Hence, Ni requires least value of magnetic strength. NaCl is a diamagnetic material. Its field lines are repelled.

Topic: Physics, Magnetic Properties of Matter, JEE Main