datavorous/entrance-exam-dataset huggingface dataset:
Which of the following statements is not correct?

Options:
A Antiseptics can be safely applied to the living tissues
B Antiseptics can be incorporated into deoderants, face powders and soaps
C Disinfectants can also be applied to the skin safely
D A very dilute solution of a few disinfectants can be used as antiseptics

The correct answer is:
Disinfectants can also be applied to the skin safely

Solution:
Disinfectants are harmful to the living tissues hence they are not applied to the skin.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following statements is not correct?

Options:
A Brunner's glands are present in the submucosa of stomach and secrete pepsinogen
B Goblet cells are present in the mucosa of intestine and secrete mucus
C Oxyntic cells are present in the mucosa of stomach and secrete HCL
D Acini are present in the pancreas and secrete carboxypeptidase

The correct answer is:
Brunner's glands are present in the submucosa of stomach and secrete pepsinogen

Solution:
Brunner's glands (or duodenal glands) are compound tubular submucosal glands found in that portion of the duodenum which is above the hepatopancreatic sphincter (Sphincter of Oddi). The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate), which is the non-enzymatic part of intestinal juice.

Topic: Biology, Digestion and Absorption, NEET
Which of the following statements is not correct?

Options:
A The number of Bravais lattices in which a crystal can be categorized is 14
B The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
C Molecular solids are generally volatile
D The number of carbon atoms in an unit cell of diamond is 4

The correct answer is:
The number of carbon atoms in an unit cell of diamond is 4

Solution:
Diamond has ZnS type structure. So, no. of atoms in a unit cell of diamond is 8 .
Note : But option (2)
is also incorrect because the fraction of the total volume occupied by the atoms in a cubic primitive cells is 0.524 .

Topic: Chemistry, Solid State, NEET, NEET 2008 (Mains)
Which of the following statements is not correct?

Options:
A Brunner's glands are present in the submucosa of the stomach and secrete pepsinogen
B Goblet cells are present in the mucosa of the intestine and secrete mucus
C Oxyntic cells are present in the mucosa of the stomach and secrete HCl
D Acini are present in the pancreas and secrete carboxypeptidase

The correct answer is:
Brunner's glands are present in the submucosa of the stomach and secrete pepsinogen

Solution:
Brunner's glands (or duodenal glands) are compound tubular submucosal glands found in that portion of the duodenum which is above the hepatopancreatic sphincter (Sphincter of Oddi). The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate), which is the non-enzymatic part of intestinal juice.

Topic: Biology, Digestion and Absorption, NEET, NEET 2015 (Phase 1)
Which of the following statements is not correct?

Options:
A Acquired immunity is pathogen specific.
B Macrophages can phagocytose and destroy microbes.
C Hallucinogenic chemicals obtained from leaves, resins and inflorescence of plant Cannabis sativa are called as cannabinoids.
D Opioid is a medicine used to help patients to cope with mental illnesses.

The correct answer is:
Opioid is a medicine used to help patients to cope with mental illnesses.

Solution:
Innate immunity is an example of non-specific immunity. Conversely, acquired or adaptive immunity is an example of highly specific immunity.

Macrophages, or the big-eaters are special types of modified WBCs which have the potential to engulf other cells and microbes (phagocytosis).

The flower tops, leaves and the resin of Cannabis plant are used in various combinations to produce marijuana, hashish, charas, and ganja, all of which are classified as cannabinoids. They interact with cannabinoid receptors present mainly in the brain.

Opioids are substances that, when reaching opioid receptors, have effects similar to those of morphine (Heroin is an opioid drug made from the acetylation of morphine), often used as medicines because they contain chemicals that relax the body and can relieve pain, though some opioids can be used to treat coughing and diarrhoea. The opioid drugs which bind to their specific opioid receptors present in our central nervous system and gastrointestinal tract.

Topic: Biology, Human Health and Diseases, NEET, NEET 2015 (Phase 2)
Which of the following statements is not correct?

Options:
A Insulin maintains sugar level in the blood of a human body.
B Ovalbumin is a simple food reserve in egg-white.
C Blood proteins thrombin and fibrinogen are involved in blood clotting.
D Denaturation makes the proteins more active.

The correct answer is:
Denaturation makes the proteins more active.

Solution:
Due to denaturation of proteins, globules unfold and helix get uncoiled and protein loses its biological activity.

Topic: Chemistry, Biomolecules, NEET, NEET 2017
Which of the following statements is not correct

Options:
A Silicon is extensively used as a semiconductor
B Carborundum is $\mathrm{SiC}$
C Silicon occurs in free state in nature
D Mica contains the element silicon

The correct answer is:
Silicon occurs in free state in nature

Solution:
Hints : Silicon exist in nature in combined state as $\mathrm{SiO}_2$

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which of the following statements is not correct about rusting of iron?

Options:
A Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.
B When pH lies above 9 or 10 , rusting of iron does not take place.
C Dissolved acidic oxides SO2,NO2 in water act as catalyst in the process of rusting.
D Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.

The correct answer is:
Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.

Solution:
Rusting refers to the creation of rust on the surface of iron objects or structures, which is a mixture of iron oxides. In a water-rich environment, rust is created through a redox interaction between oxygen and iron (or high levels of moisture). The creation of a layer of a red, flaky substance that quickly crumbles into a powder characterises the rusting of iron.

As the tin coating is peeled off, then iron is exposed to the atmosphere.

Because rusting occurs as a result of a chemical interaction between iron and air in the presence of moisture, it is a chemical alteration. The iron would not have rusted and gained a brown texture from its dull grey one if the chemical interaction between them had not occurred. As a result, a new substance known as rust forms on the surface of iron.

Hence, the answer is A.

Topic: Chemistry, Electrochemistry, JEE Main, JEE Main 2024 (27 Jan Shift 2)
Which of the following statements is not correct regarding ACTH?

Options:
A It is secreted by the anterior lobe of pituitary.
B It regulates skin pigmentation in human beings.
C It acts on the adrenal cortex and it mainly stimulates the secretion of mineralocorticoids.
D Its hypersecretion causes bronze-like pigmentation of skin.

The correct answer is:
It acts on the adrenal cortex and it mainly stimulates the secretion of mineralocorticoids.

Solution:
Adrenocorticotropin or adrenocorticotropic hormone (ACTH): It is secreted by corticotroph cells of the anterior pituitary. It is made up of 39 amino acid polypeptides. Its secretion is prompted by a corticotrophin-release hormone (CRH) of the hypothalamus. Its role is to intensify synthesis of adrenal cortical hormones, particularly the glucocorticoids. The secretion of ACTH is stimulated by low blood level of glucose, shock conditions and presence of a compound called interleukin-1 (IL-1) secreted by macrophages.

Topic: Biology, Chemical Coordination and Integration, NEET
Which of the following statements is not correct regarding ACTH?

Options:
A It is secreted by the anterior lobe of pituitary.
B It regulates skin pigmentation in human beings.
C It acts on the adrenal cortex and it mainly stimulates the secretion of mineralocorticoids.
D Its hypersecretion causes bronze-like pigmentation of skin.

The correct answer is:
It acts on the adrenal cortex and it mainly stimulates the secretion of mineralocorticoids.

Solution:
All the above statement regarding ACTH are correct except c.
ACTH acts on the adrenal cortex, and it mainly stimulates synthesis and secretion of glucocorticoids.

Topic: Biology, Chemical Coordination and Integration, NEET
Which of the following statements is not correct regarding kinetic theory of gases?

Options:
A Gases are considered as point masses
B Kinetic energy of gas molecules increases with temperature
C Total energy of molecules before and after the collisions is different
D The distribution of molecular speed of a gas remains constant at a particular temperature

The correct answer is:
Total energy of molecules before and after the collisions is different

Solution:
The explanation of given statements are as follows:
(a) Gas particles are considered as point masses or rigid particles.
(b) Kinetic energy of gas molecules are directly proportional to absolute temperature.
$$
\therefore \quad \text { K.E. } \propto T
$$
Therefore, K.E. increase with increasing temperature.
(c) Rigid elastic gas particles show collisions and follow energy conservation rule. Therefore, energy of molecules before and after the collisions are equal.
(d) The distribution of molecular speed of gas remain constant at particular temperature. Hence, option (3) is incorrect.

Topic: Chemistry, States of Matter, TS EAMCET, TS EAMCET 2019 (04 May Shift 1)
Which of the following statements is not incorrect?

Options:
A Ovalbumin is a simple food reserve in egg-white
B Blood proteins thrombin and fibrinogen are involved in blood clotting
C Denaturation makes the proteins more active
D Insulin maintains sugar level in the blood of a human body

The correct answer is:
Denaturation makes the proteins more active

Solution:
As during Denaturation of protein, the reactivity of protein decreases.
Rest other options are correct facts.

Topic: Chemistry, Biomolecules, NEET
Which of the following statements is not true?

Options:
A The resistance of intrinsic semiconductors decreases with increase of temperature
B Doping pure Si with trivalent impurities give p-type semiconductors
C The majority carriers in n-type semiconductors are holes
D A p-n junction can act as a semiconductor diode

The correct answer is:
The majority carriers in n-type semiconductors are holes

Solution:
In n - type semiconductors, electrons are the majority charge carriers.

Topic: Physics, Semiconductors, JEE Main
Which of the following statements is not true?

Options:
A
Chain growth polymerisation involves homopoly-merisation only

B
Chain growth polymerisation includes both homo-polymerisation and copolymerisation

C
Nylon 6 is an example of step-growth polymerisation

D
Step growth polymerisation requires a bifunctional monomer

The correct answer is:
Chain growth polymerisation includes both homo-polymerisation and copolymerisation

Solution:
The statement (b) is not true. Chain growth polymerisation (or addition polymerisation) involves homopolymerisation only Examples of such polymers include polythene, orlon and teflon.

Topic: Chemistry, Polymers, JEE Main, JEE Main 2018 (15 Apr Shift 2 Online)
Which of the following statements is not true

Options:
A The coefficient of friction between two surfaces increases as the surface in contact are made rough
B The force of friction acts in a direction opposite to the applied force
C Rolling friction is greater than sliding friction
D The coefficient of friction between wood and wood is less than 1

The correct answer is:
Rolling friction is greater than sliding friction

Solution:
As the surface in contact are made rough, interaction between the surfaces is more established and hence the coefficient of friction between two surfaces increases.
The force of static friction tries to stop the body from moving, so it will act in a direction opposite to the applied force(moving will be due to the applied force. Friction always resist relative motion)

Topic: Physics, Laws of Motion, JEE Main
Which of the following statements is not true?

Options:
A Natural rubber is a 1,4 - polymer of isoprene
B In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger
C Natural rubber has the trans-configuration at every double bond
D Buna-S is a copolymer of butadiene and styrene

The correct answer is:
Natural rubber has the trans-configuration at every double bond

Solution:
Natural rubber has cis-configuration at each double bond.
Gutta-Percha has trans-configuration of each double bond.

Topic: Chemistry, Polymers, NEET, NEET 2008 (Mains)
Which of the following statements is not true about classical smog?

Options:
A
Its main components are produced by the action of sunlight on emissions of automobiles and factories

B
Produced in cold and humid climate

C
It contains compounds of reducing nature

D
It contains smoke, fog and sulphur dioxide

The correct answer is:
Its main components are produced by the action of sunlight on emissions of automobiles and factories

Solution:
Classical smog occurs in cold humid climate. It is a mixture of smoke, fog and sulphur dioxide.

Topic: Chemistry, Environmental Chemistry
Which of the following statements is not true about $\mathrm{NaCl}$ structure

Options:
A $\mathrm{Cl}^{-}$ions are in $f c c$ arrangement
B $\mathrm{Na}^{+}$ions has coordination number 4
C $\mathrm{Cl}^{-}$ions has coordination number 6
D Each unit cell contains $4 \mathrm{NaCl}$ molecules

The correct answer is:
$\mathrm{Na}^{+}$ions has coordination number 4

Solution:
In $\mathrm{NaCl}$ crystal $\mathrm{Na}^{+}$ions has coordination number 6 .

Topic: Chemistry, Solid State, JEE Main
Which of the following statements is not true about partition chromatography?

Options:
A Stationary phase is a finely divided solid adsorbent.
B Separation depends upon equilibration of solute between a mobile and a stationary phase.
C Mobile phase can be a gas.
D Paper chromatography is an example of partition chromatography.

The correct answer is:
Mobile phase can be a gas.

Solution:
Mobile phase can be a liquid but not gas.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2017 (08 Apr Online)
Which of the following statements is NOT true about polymorphism?

Options:
A The existence of substance in more than one crystalline form.
B Polymorphism occurring in element is called allotropy.
C Polymorphic forms of a substance are formed under different conditions.
D The crystal shape of polymorphic substances is identical to each other.

The correct answer is:
The crystal shape of polymorphic substances is identical to each other.

Solution:
The crystal shapes of the polymorphic forms of a substance are different.

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which of the following statements is not true about RNA?

Options:
A It controls the synthesis of protein
B It usually does not replicate
C It has always double standard α- helix structure
D It is present in the nucleus of the cell

The correct answer is:
It has always double standard α- helix structure

Solution:
RNA is a single Helix structure in which hydrogen bonding are not present between nitrogen base and is made of ribonucleotides that are linked by phosphodiester bonds.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2019 (12 Apr Shift 1)
Which of the following statements is not true about somatic embryogenesis?

Options:
A The pattern of development of a somatic embryo is comparable to that of a zygotic embryo.
B Somatic embryos can develop from microspores.
C Somatic embryo is induced usually by an auxin such as 2, 4-D.
D A somatic embryo develops from a somatic cell.

The correct answer is:
Somatic embryos can develop from microspores.

Solution:
Microspore are haploid cells, formed by meiotic division. Somatic cmbryos develop from somatic cells.
Related Theory
Somatic embryogenesis is an artificial process in which a plant or embryo is derived from a single somatic cell. Somatic embryos are formed from plant cells that are not normally involved in the development of embryos, i.e.s ordinary plant tissue. No endosperm or seed coat is formed around a somatic embryo. It plays a role in clonal propagation. The process of somatic embryogenesis involves four key steps which are, induction, maintenance, development. and regeneration.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2013 (Karnataka)
Which of the following statements is not true about sucrose?

Options:
A It is also named as invert sugar.
B It is a non-reducing sugar.
C The glycosidic linkage is present Between C1 of α -glucose and C1 of β -fructose.
D On hydrolysis, it produces glucose and fructose.

The correct answer is:
The glycosidic linkage is present Between C1 of α -glucose and C1 of β -fructose.

Solution:
Sucrose is a disaccharide which is formed due to glycosidic linkage between C1 of α- glucose and C2 of β- fructose.
Sucrose also named as invert sugar, and it is a non-reducing sugar.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2019 (09 Apr Shift 1)
Which of the following statements is not true according to collision theory of reaction rates

Options:
A Collision of molecules is a precondition for any reaction to occur
B All collisions result in the formation of the products
C Only activated collisions result in the formation of the products
D Molecules which have acquired the energy of activation can collide effectively

The correct answer is:
All collisions result in the formation of the products

Solution:
All collisions are not effective and does not result in the formation of the products

Topic: Chemistry, Chemical Kinetics, JEE Main
Which of the following statements is not true for a lyophobic sol

Options:
A It can be easily solvated
B It carries charge
C The coagulation of this sol is irreversible in nature
D It is less stable in a solvent

The correct answer is:
It can be easily solvated

Solution:
Correct option is 1. It can be easily solvated
Lyophilic sols are quite stable and cannot be easily coagulated. Lyophobic sols are readily coagulated on the addition of small amounts of electrolytes, by heating or by shaking and hence, are not stable.

Topic: Chemistry, Surface Chemistry, JEE Main
Which of the following statements is not true for ethane

Options:
A It can be chlorinated with chlorine
B It can be catalytically hydrogenated
C When oxidised produces $\mathrm{CO}_2$ and $\mathrm{H}_2 \mathrm{O}$
D It is a homologue of iso-butane

The correct answer is:
It can be catalytically hydrogenated

Solution:
Ethane is a saturated compound it can not be catalytically hydrogenated.

Topic: Chemistry, Hydrocarbons, JEE Main
Which of the following statements is not true for hydrogen:
1) It exists as a diatomic molecule.
2) It has one electron in the outermost shell.
3) It can lose an electron to form a cation which can freely exist
4) It cannot form ionic compounds.

Options:
A \( 1 \)
B \( 2 \)
C \( 3 \)
D \( 4 \)

The correct answer is:
\( 3 \)

Solution:
When an atom of hydrogen loses an electron, it becomes a proton that has an extremely small size (less than 10-15 m), and therefore has difficulty in surviving. Generally, the proton (H+) is captured by species having a lone pair of electrons, like with the case of hydronium ions in water.

Topic: Chemistry, Hydrogen, JEE Main
Which of the following statements is not true for ionic compounds

Options:
A High melting point
B Least lattice energy
C Least solubility in organic compounds
D Soluble in water

The correct answer is:
Least lattice energy

Solution:
Ionic compounds typically have high lattice energy, which contributes to their high melting points and solubility in water. They also tend to have low solubility in organic compounds

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main
Which of the following statements is not true for the reaction $2 \mathrm{~F}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HF}+\mathrm{O}_{2} ?$

Options:
A $\mathrm{F}_{2}$ is more strongly oxidising than $\mathrm{O}_{2}$
B $\mathrm{F}-\mathrm{F}$ bond is weaker than $\mathrm{O}=\mathrm{O}$ bond
C $\mathrm{H}-\mathrm{F}$ bond is stronger than $\mathrm{H}-\mathrm{O}$ bond
D $\mathrm{F}$ is less electronegative than $\mathrm{O}$

The correct answer is:
$\mathrm{F}$ is less electronegative than $\mathrm{O}$

Solution:
Hint:
$\mathrm{F}$ is more electronegative than $\mathrm{O}$

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of the following statements is not true in regard to transition elements

Options:
A They readily form complex compounds
B They show variable valency
C All their ions are colourless
D Their ions contain partially filled d -electron levels

The correct answer is:
All their ions are colourless

Solution:
"All their ions are colourless" this sentence is false because they are 90% coloured and only few are colourless.

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following statements is true?

Options:
A Saltatory conduction is seen in non-myelinated nerve fibres
B Nissl's granules are found in muscles fibres
C Non-myelinated nerve fibres do not possess nodes of Ranvier
D Non-myelinated nerve fibres are completely enclosed by a myelin sheath

The correct answer is:
Non-myelinated nerve fibres do not possess nodes of Ranvier

Solution:
In myelinated nerve fibre, the myelin sheath is not continuous and remains interrupted at some places. These are known as nodes of Ranvier. These help in the saltatory conduction of nerve impulse. The non-myelinated nerve fibres do not possess nodes of Ranvier.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following statements is true ?

Options:
A
HF is less polar than HBr

B
absolutely pure water does not contain any ions

C
chemical bond formation take place when forces of attraction overcome the forces of repulsion

D
in covalency transference of electron takes place

The correct answer is:
chemical bond formation take place when forces of attraction overcome the forces of repulsion

Solution:
No Solution Available

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main, JEE Main 2002
Which of the following statements is true?

Options:
A
$\mathrm{H}_3 \mathrm{PO}_3$ is a stronger acid than $\mathrm{H}_2 \mathrm{SO}_3$

B
In aqueous medium $\mathrm{HF}$ is a stronger acid than $\mathrm{HCl}$

C
$\mathrm{HClO}_4$ is a weaker acid than $\mathrm{HClO}_3$

D
$\mathrm{HNO}_3$ is a stronger acid than $\mathrm{HNO}_2$

The correct answer is:
$\mathrm{HNO}_3$ is a stronger acid than $\mathrm{HNO}_2$

Solution:
No Solution Available

Topic: Chemistry, Ionic Equilibrium, JEE Main, JEE Main 2006
Which of the following statements is true?

Options:
A The total entropy of the universe is continuously decreasing
B The total energy of the universe is continuously decreasing
C The total energy of the universe remains constant
D The total entropy of the universe remains constant

The correct answer is:
The total energy of the universe remains constant

Solution:
Mole fraction in vapour phase
$$
\begin{aligned}
y_{\Lambda} &=\frac{\mathrm{p}_{A} x_{A}}{p_{T}} \\
&=\frac{p_{\Lambda} \times \frac{1}{3}}{\frac{5}{3} \mathrm{p}_{\Lambda}}=\frac{1}{5}=0.2
\end{aligned}
$$

Topic: Chemistry, Thermodynamics (C), KCET, KCET 2012
Which of the following statements is true ?

Options:
A
HF is less polar than HBr

B
absolutely pure water does not contain any ions

C
chemical bond formation take place when forces of attraction overcome the forces of repulsion

D
in covalency transference of electron takes place

The correct answer is:
chemical bond formation take place when forces of attraction overcome the forces of repulsion

Solution:
No Solution Available

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main