datavorous/entrance-exam-dataset huggingface dataset:
Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

Options:
A Propane
B Mustard gas
C Marsh gas
D Laughing gas

The correct answer is:
Marsh gas

Solution:
The decomposition of sludge by anaerobic bacteria in sewage-treatment processes produces marsh gas (methane).

Topic: Biology, Microbes in Human Welfare, NEET, NEET 2011 (Screening)
Which of the following is mainly used to meet with the deficit which occurs due to an imbalance in the rate of influx and efflux of carbon in the atmosphere?

Options:
A Fossil fuels
B Oceans
C Microbes
D Rock

The correct answer is:
Oceans

Solution:
Carbon naturally moves between these reservoirs by many processes, such as carbon dioxide (CO2) dissolving in the ocean, plants absorbing CO2 in photosynthesis, animals eating carbohydrates stored in plants, and releasing CO2 through respiration. The ocean is the largest reservoir of carbon among all. Any disturbance in the carbon level is balanced by carbon stored in the ocean.

Topic: Biology, Ecosystem, NEET
Which of the following is metalloid ?

Options:
A Sb
B Mg
C Zn
D Bi

The correct answer is:
Sb

Solution:
A metalloid is a chemical element with properties that are intermediate between those of metals and nonmetals.
Metalloids=B, Si,As,Te,At,Sb,Ge

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of the following is metamer of the given compound \((\mathrm{X})\) ?

Options:
A

B

C

D

The correct answer is:

Solution:
Metamer $\Rightarrow$ Isomer having same molecular formula, same functional group but different alkyl/aryl groups on either side of functional group.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2024 (06 Apr Shift 1)
Which of the following is mismatched?

Options:
A Vitamin-K - Beri-beri
B Vitamin-D - Rickets
C Vitamin-C - Scurvy
D Vitamin-A - Xerophthalmia

The correct answer is:
Vitamin-K - Beri-beri

Solution:
Beri-beri is caused by the deficiency of vitamin- $\mathrm{B}_1$ (thiamine).
Vitamin- K is also known as antihaemorrhagic factor. The main sources of vitamin-K are green leafy vegetables such as cauliflower, cabbage, spinach, etc. It is also found in animal sources like egg yolk, liver, etc. Vitamin-K is essential for blood clotting and deficiency of it causes haemorrhage.

Topic: Biology, Digestion and Absorption, JIPMER, JIPMER 2011
Which of the following is more basic than aniline?

Options:
A benzylamine
B diphenylamine
C triphenylamine
D p-nitroaniline

The correct answer is:
benzylamine

Solution:
Benzyl amine is more basic than aniline because the benzyl group is an electron-donating group on account of the + I effect. So, it is capable of increasing the electron density of $\mathrm{N}$ of the $-\mathrm{NH}_2$ group. Thus, because of the higher electron density, the rate of donation of a free pair of electrons is increased, i.e., the basic character is higher. Phenyl and nitro groups are electron attractive groups, so they are able to decrease the electron density of $\mathrm{N}$ of $-\mathrm{NH}_2$ group. Hence, they are less basic than aniline.
A Caution
Benzylamine has localised lone pair therefore it is more basic.

Topic: Chemistry, Amines, JEE Main
Which of the following is more basic than aniline?

Options:
A Diphenylamine
B Triphenylamine
C p-nitroaniline
D Benzylamine

The correct answer is:
Benzylamine

Solution:
As lone pair of electrons over N-atom of NH2 in benzylamine are not directly attached to the benzene ring. So, are not available for the resonance. Thus, benzylamine is more basic than aniline.

Topic: Chemistry, General Organic Chemistry, JEE Main
Which of the following is more closed to a black body?

Options:
A
black board paint

B
green leaves

C
black holes

D
red roses

The correct answer is:
black board paint

Solution:
Black body also emits radiation whereas nothing escapes a black hole.

Topic: Physics, Thermal Properties of Matter, JEE Main, JEE Main 2002
Which of the following is most electronegative

Options:
A O
B S
C Te
D Se

The correct answer is:
O

Solution:

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Which of the following is most reactive towards nucleophilic substitution reaction?

Options:
A Ethyl acetate
B Acetic anhydride
C Acetamide
D Acetyl chloride

The correct answer is:
Acetyl chloride

Solution:
The order of reactivity of acid derivatives towards different reactions decreases in the order,
RCOCl>(RCO)2O>RCOOR′>RCONH2
In other words, the reactivity decreases as the basicity of the leaving group increases i.e.,
Cl-<RCOO-<RO-<NH2-

Topic: Chemistry, Carboxylic Acid Derivatives, JEE Main
Which of the following is most soluble in water?

Options:
A CsClO4
B NaClO4
C KClO4
D LiClO4

The correct answer is:
LiClO4

Solution:
The high solubility of LiClO4 is mainly due to highest heat of hydration of Li+ ion.

Topic: Chemistry, s Block Elements, JEE Main
Which of the following is most stable ?

Options:
A
Structure(A)
B
Structure (B)
C
Structure(C)
D
Structure(D)

The correct answer is:
Structure(A)

Solution:
In (C) and (D) there is lp-bp repulsions. The size of methyl group is greater than F , hence (B) experience greater repulsion than (A).
according to bent rule more electronegative atom occupy axial position because axial position has more p- character, so 2 F atoms placed at axial first then rest of F atom occupy equatorial position.

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main
Which of the following is not a broad spectrum antibiotic?

Options:
A Vancomycin
B Penicillin G
C Ofloxacin
D Ampicillin

The correct answer is:
Penicillin G

Solution:
A broad-spectrum antibiotic is an antibiotic that acts on the two major bacterial groups, gram-positive and gram-negative, or any antibiotic that acts against a wide range of disease-causing bacteria.

Penicillin G has a narrow spectrum. Ampicillin and Amoxycillin are synthetic modifications of penicillins. These have broad spectrum.

Chloramphenicol is a broad spectrum antibiotic. It is rapidly absorbed from the gastrointestinal tract and hence can be given orally in case of typhoid, dysentery, acute fever, certain form of urinary infections, meningitis and pneumonia.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main, JEE Main 2022 (24 Jun Shift 1)
Which of the following is not a character of racemose?

a. The floral axis shows continuous growth
b. The basal flower is older, and the apical flower is younger.
c. The flower opens from the periphery to the centre.
d. The arrangement is basipetal.

Options:
A a and c
B b and d
C Only c
D Only d

The correct answer is:
Only d

Solution:
The arrangement of flowers on the floral axis is termed an inflorescence. Depending on whether the apex gets developed into a flower or continues to grow, two major types of inflorescences are defined: racemose and cymose. In the racemose type of inflorescences, the main axis continues to grow, the flowers are borne laterally in an acropetal succession.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following is not a characteristic feature of Fabaceae?

Options:
A Corolla five petals, gamopetalous, papilionaceous
B Zygomorphic flowers, diadelphous stamens, many ovules
C Sepals five, gamosepalous, imbricate aestivation, placentation marginal
D Monocarpellary, ovary superior, seeds non-endospermic

The correct answer is:
Corolla five petals, gamopetalous, papilionaceous

Solution:
Fabaceae is a subfamily of Leguminosae which mainly comprises of roots, herbs, shrubs and trees. The floral characters of such plants involve bisexual, zygomorphic flowers with five sepals of valvate or imbricate aestivation. The corolla has five separate petals (polypetalous), papilionaceous and vexillary aestivation. The androecium of Fabaceae is diadelphous and the gynoecium is monocarpellary, unilocular with a single style and many ovules, a superior ovary and the seeds may vary from one to many but without endosperms.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following is not a characteristic feature of nematodes?

Options:
A Sexes are separate
B Alimentary canal is complete
C Bilateral symmetry
D They are always endoparasitic

The correct answer is:
They are always endoparasitic

Solution:
Nematodes belong to Phylum Aschelminthes. The main distinguishing feature is that sexes are separate. These are known as roundworms as they show presence of body cavity. These show well presence of organ system and hence digestive system is also complete. These can be free living or parasitic in nature. The parasites can be in ectoparasites or endoparasites depending on whether they are on the host or inside the host.

Topic: Biology, Animal Kingdom, NEET
Which of the following is not a characteristic feature of the humus?

Options:
A It is a dark coloured, amorphous substance
B Highly resistant to microbial action
C It is reservoir of nutrients
D Cannot be degraded further

The correct answer is:
Cannot be degraded further

Solution:
On partial decomposition of the dead organic content forms a dark coloured amorphous substance called humus and the process of its formation is called humification. Humus is rich is lignin and cellulose and is the organic component of the soil. It is a colloid and found to be resistant to microbial action. Humus helps in maintaining soil moisture and aeration. Also, it is a reservoir of nutrients which are released slowly as the decomposition process. Humus can further be broken down to release inorganic content by mineralization.

Topic: Biology, Ecosystem, NEET
Which of the following is NOT a characteristic of vitamins?

Options:
A They are required in large quantities.
B They are organic compounds.
C They are essential for health.
D They can prevent specific diseases.

The correct answer is:
They are required in large quantities.

Solution:
Vitamins are required in small quantities, not large quantities, to maintain health and prevent deficiency diseases.

Topic: Chemistry, Biomolecules, NEET
Which of the following is not a characteristic property of chemical equilibrium ?

Options:
A Rate of forward reaction is equal to rate of backward reaction at equilibrium.
B After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time.
C For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases
D After reaching the equilibrium, both forward and backward reactions continue to take place

The correct answer is:
For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases

Solution:
There will be no effect on equilibrium constant $\left(K_c\right)$ in presence of catalyst. So, statement (c) is wrong.

Topic: Chemistry, Chemical Equilibrium, TS EAMCET, TS EAMCET 2006
Which of the following is not a characteristic property of chemical equilibrium ?

Options:
A Rate of forward reaction is equal to rate of backward reaction at equilibrium.
B After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time.
C For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases
D After reaching the equilibrium, both forward and backward reactions continue to take place

The correct answer is:
For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases

Solution:
There will be no effect on equilibrium constant $\left(K_c\right)$ in presence of catalyst. So, statement (c) is wrong.

Topic: Chemistry, Chemical Equilibrium, AP EAMCET, AP EAMCET 2006
Which of the following is not a characteristic property of chemical equilibrium ?

Options:
A Rate of forward reaction is equal to rate of backward reaction at equilibrium.
B After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time.
C For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases
D After reaching the equilibrium, both forward and backward reactions continue to take place

The correct answer is:
For $A(g) \rightleftharpoons B(g), K_c$ is $10^{-2}$. If this reaction is carried out in the presence of catalyst, the value of $K_c$ decreases

Solution:
There will be no effect on equilibrium constant $\left(K_c\right)$ in presence of catalyst. So, statement (c) is wrong.

Topic: Chemistry, Chemical Equilibrium, JEE Main
Which of the following is not a characteristic property of chemical equilibrium?

Options:
A Rate of forward reaction is equal to rate of backward reaction at equilibrium
B After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time
C For AgâBg, Kc is 10-2. If this reaction is carried out in the presence of catalyst, the value of Kc decreases
D After reaching the equilibrium, both forward and backward reactions continue to take place

The correct answer is:
For AgâBg, Kc is 10-2. If this reaction is carried out in the presence of catalyst, the value of Kc decreases

Solution:
There will be no effect on equilibrium constant (Kc) in presence of catalyst. So, statement (c) is wrong.

Topic: Chemistry, Chemical Equilibrium, NEET
Which of the following is not a classification of drugs?

Options:
A Based on size
B Based on chemical structure
C Based on drug action
D Based on target

The correct answer is:
Based on size

Solution:
Drugs are mainly classified on the basis of four criteria, namely pharmacological effect, drug action, chemical structure and molecular targets in the body.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which of the following is not a cloning vector?

Options:
A Probe
B YAC
C BAC
D pBR322

The correct answer is:
Probe

Solution:
A cloning vector is a small piece of DNA that can be stably maintained in an organism, and into which a foreign DNA fragment can be inserted for cloning.

Plasmids (like pBR322) is a very common cloning vector.

YAC (Yeast Artificial Chromosome) and BAC (Bacterial Artificial Chromosome) are used as vectors in human genome project.

Probe a radiolabelled piece of DNA which is used in autoradiography.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2023 (All India)
Which of the following is not a condensation polymer?

Options:
A Nylon-6,6
B Nylon-6
C Dacron
D Buna-S

The correct answer is:
Buna-S

Solution:
(a) Nylon-6,6 is the polymer of hexamethylene diamine and adipic acid. It is made by the condensation of given monomers.

(b) Nylon-6 os also a condensation polymer of caprolactum. It is a polymide.

(c) Dacron is also a condensation polymer of ethylene glycol and terephthalic acid. It is an example of polyester.

(d) Buna-S is an addition polymer of 1,3, butadiene and styrene.

Hence, only (4) is not a condensation polymer.

∴ (4) is the correct option.

Topic: Chemistry, Polymers, JEE Main, JEE Main 2022 (24 Jun Shift 2)
Which of the following is not a constituent of Phloem sap?

Options:
A Water
B Hormones
C Amino acids
D None of the above

The correct answer is:
None of the above

Solution:
Phloem sap is mainly water and sucrose, but other sugars, hormones and amino acids are also transported or translocated through phloem.

Topic: Biology, Transport in Plants, NEET
Which of the following is not a correct method of the preparation of benzyl amine from cyano benzene?

Options:
A H2/Ni
B (i) HCl/H2O (ii) NaBH4
C (i) SnCl2+HClgas (ii) NaBH4
D (i) LiAlH4 (ii) H3O+

The correct answer is:
(i) HCl/H2O (ii) NaBH4

Solution:
When cyano benzene reacts with hydrochloric acid and water to form benzoic acid which in turn reacts with sodium borohydride to form benzyl alcohol.

Thus benzy lamine is not formed in option (b). Thus using HCl/H2O and NaBH4 is not a correct method of the preparation of benzyl amine from cyano benzene.

Topic: Chemistry, Amines, JEE Main, JEE Main 2019 (10 Apr Shift 2)
Which of the following is not a correct method of the preparation of benzylamine from cyanobenzene?

Options:
A (i) HCl/H2O (ii) NaBH4
B (i) LiAlH4 (ii) H3O+
C (i) SnCl2+HCl (ii) NaBH4
D H2, Ni

The correct answer is:
(i) HCl/H2O (ii) NaBH4

Solution:

Topic: Chemistry, Amines, JEE Main
Which of the following is not a correct statement for primary aliphatic amines?

Options:
A Primary amines can be prepared by the Gabriel phthalimide synthesis.
B Primary amines are less basic than the secondary amines.
C The intermolecular association in primary amines is less than the intermolecular association in secondary amines.
D Primary amines on treating with nitrous acid solution form corresponding alcohols except methyl amine.

The correct answer is:
The intermolecular association in primary amines is less than the intermolecular association in secondary amines.

Solution:
The intermolecular association in primary amines is more than the intermolecular association in secondary amines due to 2-H atoms are present on nitrogen.

Topic: Chemistry, Amines, JEE Main, JEE Main 2021 (27 Aug Shift 1)
Which of the following is not a correct statement?

Options:
A A herbarium houses dried, pressed and preserved plant specimens.
B Botanical gardens have a collection of living plants for reference.
C A museum has a collection of photographs of plants and animals.
D Key is a taxonomic aid for identification of specimens.

The correct answer is:
A museum has a collection of photographs of plants and animals.

Solution:
A museum has a collection of dead remains of plants and animals in preserved form for study and reference.

Topic: Biology, The Living World, NEET
Which of the following is NOT a difficulty in setting SHE?

Options:
A To obtain pure hydrogen gas
B To obtain dry hydrogen gas
C To maintain exactly 1 atm pressure
D To bring the reaction in reverse direction

The correct answer is:
To bring the reaction in reverse direction

Solution:
In standard hydrogen electrode (SHE), a platinum plate coated with platinum black is used as electrode. The platinum black is capable of adsorbing large quantities of $\mathrm{H}_2$ gas. This allows the change from gaseous to ionic form and the reverse process to occur.

Topic: Chemistry, Hydrogen, MHT CET, MHT CET 2023 (10 May Shift 1)
Which of the following is not a dimensionless quantity?

Options:
A Power factor
B Quality factor
C Permeability of free space μ0
D Relative magnetic permeability μr

The correct answer is:
Permeability of free space μ0

Solution:
The power factor is defined as,cosϕ which is dimensionless, the formula of quality factor, Q=1RLC, which is also dimensionless, and the permeability in free space, μr=μμ0, but permeability in free space is defined as, μ0=c2ε0, here c is the speed of light in vacuum and ε0 is the permittivity in free space so this having dimension.

Topic: Physics, Units and Dimensions, JEE Main, JEE Main 2021 (27 Aug Shift 1)
Which of the following is not a fat soluble vitamin?

Options:
A Vitamin-B complex
B Vitamin-D
C Vitamin-E
D Vitamin-A

The correct answer is:
Vitamin-B complex

Solution:
Vitamin-A, D and $\mathrm{E}$ are fat soluble vitamins, whereas vitamin-B complex is a water soluble vitamin.

Topic: Chemistry, Biomolecules, NEET, NEET 2011 (Mains)
Which of the following is not a function of cytoskeleton in a cell?

Options:
A Intracellular transport
B Maintenance of cell shape and structure
C Support of the organelle
D Cell motility

The correct answer is:
Intracellular transport

Solution:
The cytoskeleton in a cell are involved in many functions such as mechanical support, motility, and maintenance of the shape of the cell.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following is not a function of cytoskeleton in a cell?

Options:
A
Intracellular transport

B
Maintenance of cell shape and structure

C
Support of the organelles

D
Cell motility

The correct answer is:
Cell motility

Solution:
Cytoskeletal structures are externally minute, fibrous and tubular structures which maintain cell shape and support the organelles. They also help in intracellular transport and cell mobility.

Topic: Biology, Cell - The Unit of Life
Which of the following is NOT a function of salt bridge?

Options:
A Provide electrical contact
B Convert electrical energy to chemical energy
C Maintain electrical neutrality
D Prevent mixing of solutions

The correct answer is:
Convert electrical energy to chemical energy

Solution:
Theory based

Topic: Chemistry, Electrochemistry, MHT CET, MHT CET 2022 (11 Aug Shift 1)
Which of the following is not a function of the large intestine?

Options:
A Digestion
B Absorption of water and minerals
C Secretion of mucus
D All of the above are functions of the large intestine

The correct answer is:
Digestion

Solution:
The large intestine is not responsible for any significant digestive activity, its main functions are the absorption of water, minerals, and certain drugs, and the secretion of mucus which helps in adhering the waste particles together and lubricating it for an easy passage.

Topic: Biology, Digestion and Absorption, NEET
Which of the following is not a fundamental reason for greater biodiversity in tropics as compared to that of temperate regions?

Options:
A Tropical latitudes have remained relatively undisturbed for millions of years
B Temperate environments, unlike tropical ones, are less seasonal, relatively more constant and predictable
C Temperate regions were subjected to frequent glaciations in the past
D There is more solar energy available in the tropics which contributes to higher productivity

The correct answer is:
Temperate environments, unlike tropical ones, are less seasonal, relatively more constant and predictable

Solution:
Tropical environments, are less seasonal, and relatively more constant and predictable then temperate ones. Also temperate zones have undergone frequent changes in the past which has led to constant changing environmental conditions which is not favorable for species diversity where as tropical zones have more or less remained unchanged.

Topic: Biology, Biodiversity and its Conservation, NEET
Which of the following is not a green house gas?

Options:
A $\mathrm{CH}_{4}$
B $\mathrm{CO}_{2}$
C $\mathrm{O}_{3}$
D $\mathrm{H}_{2} \mathrm{O}$

The correct answer is:
$\mathrm{H}_{2} \mathrm{O}$

Solution:
Green house gases are $\mathrm{CO}_{2}, \mathrm{CH}_{4}, \mathrm{~N}_{2} \mathrm{O}, \mathrm{CF}_{x} \mathrm{Cl}_{x}$ and $\mathrm{O}_{3}$. Thus, $\mathrm{H}_{2} \mathrm{O}$ is not a greenhouse gas.

Topic: Physics, Kinetic Theory of Gases, JEE Main
Which of the following is not a Lewis acid

Options:
A CO
B $\mathrm{SiCl}_4$
C $\mathrm{SO}_3$
D $\mathrm{Zn}{ }^{2+}$

The correct answer is:
CO

Solution:
$C O$ doesn't have a vacant $d$-orbital.

Topic: Chemistry, Ionic Equilibrium, JEE Main
Which of the following is not a mineral of fluorine?

Options:
A Fluorspar
B Cryolite
C fluoropatite
D Carnallite

The correct answer is:
Carnallite

Solution:
Fluorine is present mainly as insoluble fluorides (fluorspar CaF2 , cryolite Na3AlF6 and fluoroapatite 3Ca3(PO4)2.CaF2) and small quantities are present in soil, river water plants and bones and teeth of animals.

Carnalite is KCl.MgCl2.6H2O.It does not contain fluorine.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), TS EAMCET, TS EAMCET 2022 (18 Jul Shift 1)
Which of the following is NOT a natural polymer?

Options:
A Protein
B Starch
C Rubber
D Rayon

The correct answer is:
Rayon

Solution:
Natural polymers
These polymers are found in plants and animals. Examples are proteins, cellulose, starch, some resins and rubber.

Semi synthetic polymers are those polymers that are prepared by chemically treating natural polymers. Rayon is a regenerated cellulosic fibre. So, Rayon is semisynthetic polymer.

Topic: Chemistry, Polymers, JEE Main, JEE Main 2022 (29 Jul Shift 2)