datavorous/entrance-exam-dataset huggingface dataset:
What is the primary function of the mucus on a frog's skin?

Options:
A To protect the frog from predators
B To keep the skin moisturised
C To help the frog swim more efficiently
D To attract a mate

The correct answer is:
To keep the skin moisturised

Solution:
The skin of a frog is smooth and slippery due to the presence of mucus, which helps to maintain a moist condition on the skin.

Topic: Biology, Structural Organisation in Animals, NEET
What is the primary function of the pyloric sphincter?

Options:
A To absorb remaining nutrients from food
B To control the flow of food from the stomach into the duodenum
C To neutralize stomach acid before it enters the small intestine
D To digest and absorb carbohydrates

The correct answer is:
To control the flow of food from the stomach into the duodenum

Solution:
The opening of the stomach into the duodenum is guarded by the pyloric sphincter. This sphincter acts as a valve that controls the flow of food from the stomach into the duodenum, which is the first part of the small intestine.

Topic: Biology, Digestion and Absorption, NEET
What is the primary medium of transport for oxygen (O₂) in the blood?

Options:
A Red Blood Cells (RBCs)
B Plasma
C Bicarbonate
D None of the above

The correct answer is:
Red Blood Cells (RBCs)

Solution:
About 97% of O₂ is transported by RBCs in the blood, and the remaining 3% is carried in a dissolved state through the plasma.

Topic: Biology, Breathing and Exchange of Gases, NEET
What is the primary purpose of cleaving the ozonide in ozonolysis?

Options:
A To form ozone
B To generate an alkene
C To isolate the ozonide
D To obtain smaller organic molecules

The correct answer is:
To obtain smaller organic molecules

Solution:
The main purpose of cleaving the ozonide in ozonolysis is to break it down into smaller organic molecules for analysis or further use.

Topic: Chemistry, Hydrocarbons, NEET
What is the primary purpose of liquation?

Options:
A To extract metals from ores
B To evaporate metal mixtures
C To separate metals based on their melting points
D To dissolve impurities in a solvent

The correct answer is:
To separate metals based on their melting points

Solution:
Liquation's main aim is to separate metals by exploiting the differences in their melting points.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
What is the primary purpose of using alkali in the hydrolysis step of the Reimer-Tiemann reaction?

Options:
A To neutralise acidic byproducts
B To increase the reaction rate
C To prevent side reactions
D To enhance the reaction's selectivity

The correct answer is:
To neutralise acidic byproducts

Solution:
Alkali is used in the hydrolysis step to neutralise any acidic byproducts formed during the reaction, maintaining the reaction's conditions.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
What is the primary reason for the weak attraction of ferrimagnetic substances to a magnetic field?

Options:
A All domains have their magnetic moments aligned in the same direction.
B All domains have their magnetic moments aligned in anti-parallel directions.
C Some domains have their magnetic moments aligned in parallel directions, while others have them aligned in anti-parallel directions.
D Ferrimagnetic substances have no magnetic moments.

The correct answer is:
Some domains have their magnetic moments aligned in parallel directions, while others have them aligned in anti-parallel directions.

Solution:
The weak attraction of ferrimagnetic substances to a magnetic field is due to the partial alignment of domains in parallel and anti-parallel directions.

Topic: Chemistry, Solid State, NEET
What is the primary role of hybrid orbitals in the formation of stable bonds?

Options:
A To maximize electron repulsion
B To minimize electron repulsion and achieve stability
C To determine the energy levels of electrons
D To increase the bond length

The correct answer is:
To minimize electron repulsion and achieve stability

Solution:
The main role of hybrid orbitals is to minimize electron repulsion between electron pairs and achieve a stable arrangement.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
What is the probability of having 53 Sundays or 53 Mondays in a leap year?

Options:
A $2 / 7$
B $3 / 7$
C 4/7
D $5 / 7$

The correct answer is:
$3 / 7$

Solution:
A leap year has 366 days, in which 2 days may be any one of the following pairs. (Sunday, Monday), (Monday, Tuesday), (Tuesday, Wednesday), (Wednesday, Thursday), (Thursday, Friday) (Friday, Saturday) (Saturday, Sunday).
$\therefore \quad$ Required probability $=\frac{2}{7}+\frac{2}{7}-\frac{1}{7}=\frac{3}{7}$
(By using $\mathrm{P}(\mathrm{A} \cup \mathrm{B})=\mathrm{P}(\mathrm{A})+\mathrm{P}(\mathrm{B})-\mathrm{P}(\mathrm{A} \cap \mathrm{B})$

Topic: Mathematics, Probability, JEE Main
What is the probability of having a knave and a queen when two cards are drawn from a pack of 52 cards?

Options:
A $\frac{16}{663}$
B $\frac{2}{663}$
C $\frac{4}{663}$
D $\frac{8}{663}$

The correct answer is:
$\frac{4}{663}$

Solution:
Required probability $=\frac{4}{52} \times \frac{4}{51}$
[Since, card is not replaced after first draw]
$=\frac{4}{13 \times 51}=\frac{4}{663}$

Topic: Mathematics, Probability, JEE Main
What is the probability that a leap year selected at random contains 53 Mondays?

Options:
A $\frac{1}{7}$
B $\frac{2}{7}$
C $\frac{7}{366}$
D $\frac{26}{183}$

The correct answer is:
$\frac{2}{7}$

Solution:
No. of days in leap year $=366$ No. of complete week $=52$
$(\because 366 \div 7$ gives 2 as remainder $)$
$\therefore \quad$ No. of days left $=2$
Required probability $=\frac{2}{7}$

Topic: Mathematics, Probability, NDA, NDA 2012 (Phase 1)
What is the probability that in a family of 4 children there will be at least one boy?

Options:
A $\frac{15}{16}$
B $\frac{3}{8}$
C $\frac{1}{16}$
D $\frac{7}{8}$

The correct answer is:
$\frac{15}{16}$

Solution:
Total possibility of 4 children, either girl or boy is $2^{4}$ $=16$. Out of these there is one possibility in which there will be no boy and only girls. So, total possibility of at least one boy is $16-1=15$
$\Rightarrow \quad \mathrm{P}($ at least one boy $)=\frac{15}{16}$.

Topic: Mathematics, Probability, JEE Main
What is the process by which the tubular cells secrete substances into the filtrate?

Options:
A reabsorption
B ultrafiltration
C secretion
D glomerular filtration

The correct answer is:
secretion

Solution:
During urine formation, the tubular cells secrete substances like H⁺, K⁺ and ammonia into the filtrate. Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.

Topic: Biology, Excretory Products and their Elimination, NEET
What is the process of multiplying copies of a specific gene called?

Options:
A Identification of DNA with desirable genes
B Introduction of the identified DNA into the host
C Maintenance of introduced DNA in the host and transfer to its progeny
D Cloning of the desired genes in E. coli

The correct answer is:
Cloning of the desired genes in E. coli

Solution:
The process of multiplying copies of a specific gene is called cloning of the desired genes in E. coli.

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the process which we have to follow just after Crushing and grinding

Options:
A Concentration
B Purification of metal
C Reduction to free metal
D No need to follow any method

The correct answer is:
Concentration

Solution:
Correct Option is 1 Concentration
The various steps involved in metallurgy are:
1. Crushing and grinding: The ore is crushed into a fine powder in big crushers and ball mills.
2. The concentration of ore: Removal of unwanted impurities such as rocks, and sand from the ore is called concentration of metal in mineral ore by removal of gange.
3. Roasting and calcination: The process of conversion of concentrated ore into metal oxide by roasting or calcination.
4. Reduction: The metal oxides are reduced to the corresponding metals by using a suitable reducing agent.
5. Refining: The purification of impure metals by removing metallic and nonmetallic impurities is called refining.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, JEE Main
What is the product "C" after following reactions -

Options:
A

B

C

D

The correct answer is:

Solution:
This is the Kolbe-Schmidt's reaction
This treated with acetic anhydride will acetylate the - OH

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
What is the product "C" after following reactions -

Options:
A

B

C

D

The correct answer is:

Solution:
This is the Kolbe-Schmidt's reaction
This treated with acetic anhydride will acetylate the - OH

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main, JEE Main 2014 (06 Apr)
What is the product $E$ in the following reaction?

Options:
A

B

C

D

The correct answer is:

Solution:
The given reaction proceed in a similar way as that of benzoin condensation.
$$
\text { The complete reaction is given as below: }
$$
Hence, option ' $\mathrm{C}$ ' is the correct answer.

Topic: Chemistry, Aldehydes and Ketones, JEE Main
What is the product formed when an ester is hydrolyzed in acidic medium?

Options:
A Alcohol and alkane
B Alcohol and carboxylic acid
C Ketone and water
D Aldehyde and water

The correct answer is:
Alcohol and carboxylic acid

Solution:
Alcohol and carboxylic acid
Explanation: Acid-catalyzed hydrolysis of an ester produces an alcohol and a carboxylic acid.

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
What is the product of the aldol condensation between two molecules of acetaldehyde?

Options:
A Butanal
B 2-Butanone
C 3-Hydroxybutanal
D 2-Methyl-2-butanol

The correct answer is:
3-Hydroxybutanal

Solution:
3-Hydroxybutanal
Explanation: The aldol condensation between two molecules of acetaldehyde (ethanal) yields 3-hydroxybutanal (aldol), which may further dehydrate to form crotonaldehyde (but-2-enal) under certain conditions

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
What is the product of the following reaction?

Options:
A
B
C
D

The correct answer is:

Solution:
It is a case of Aldol Condensation to give a β hydroxyl carbonyl compound as follows

Topic: Chemistry, Aldehydes and Ketones, JEE Main
What is the product of the reaction between an aldehyde and a primary amine?

Options:
A Alcohol
B Imine
C Ketone
D Carboxylic acid

The correct answer is:
Imine

Solution:
Imine
Explanation: Aldehydes react with primary amines to form imines (Schiff bases) through a nucleophilic addition followed by the loss of water.

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
What is the product of the reaction of 1,3 -butadiene with $\mathrm{Br}_2$

Options:
A 1,4-dibromobutene
B 1,2 -dibromobutene
C 3,4-dibromobutene
D 2,3-dibromo-2-butene

The correct answer is:
1,4-dibromobutene

Solution:
1,4-dibromobutene

Topic: Chemistry, Hydrocarbons, JEE Main
What is the product of the reaction of H2O2 With Cl2?

Options:
A O2+HOCl
B HCl+O2
C H2O+HCl
D HCl+H2

The correct answer is:
HCl+O2

Solution:
Cl 2 + H 2 O 2 → 2 HCl + O 2

Topic: Chemistry, s Block Elements, JEE Main
What is the product when acetylene reacts with hypochlorous acid ?

Options:
A
$\mathrm{CH}_3 \mathrm{COCl}$

B
$\mathrm{ClCH}_2 \mathrm{CHO}$

C
$\mathrm{Cl}_2 \mathrm{CHCHO}$

D
$\mathrm{ClCHCOOH}$

The correct answer is:
$\mathrm{Cl}_2 \mathrm{CHCHO}$

Solution:

Topic: Chemistry, Haloalkanes and Haloarenes, JEE Main
What is the product when acetylene reacts with hypochlorous acid ?

Options:
A
$\mathrm{CH}_3 \mathrm{COCl}$

B
$\mathrm{ClCH}_2 \mathrm{CHO}$

C
$\mathrm{Cl}_2 \mathrm{CHCHO}$

D
$\mathrm{ClCHCOOH}$

The correct answer is:
$\mathrm{Cl}_2 \mathrm{CHCHO}$

Solution:

Topic: Chemistry, Haloalkanes and Haloarenes, JEE Main, JEE Main 2002
What is the product when an alkene reacts with a peracid like peracetic acid?

Options:
A Alcohol
B Ketone
C Oxirane (epoxide)
D Ester

The correct answer is:
Oxirane (epoxide)

Solution:
Oxirane (epoxide)
Explanation: The reaction of an alkene with a peracid results in the formation of an epoxide (oxirane) through a concerted mechanism

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
What is the product when an amide is hydrolyzed in acidic conditions?

Options:
A Amine and water
B Carboxylic acid and amine
C Carboxylic acid and ammonia
D Ester and water

The correct answer is:
Carboxylic acid and amine

Solution:
Amine and carboxylic acid
Explanation: Acidic hydrolysis of amides yields a carboxylic acid and an amine. The reaction involves breaking the amide bond and adding water.

Topic: Chemistry, Amines, JEE Main
What is the proposed classification system that divides the Kingdom Monera into two domains and leaves the remaining eukaryotic Kingdoms in the third domain?

Options:
A The three-Kingdom system
B The two-domain system
C The six-Kingdom classification
D The Moneran classification

The correct answer is:
The six-Kingdom classification

Solution:
The three-domain system has been proposed, which divides the Kingdom Monera into two domains and leaves the remaining eukaryotic Kingdoms in the third domain, resulting in a six Kingdom classification.

Topic: Biology, Biological Classification, NEET
What is the purpose of a bioreactor in recombinant protein production?

Options:
A To provide optimal conditions for cloning of foreign genes
B To extract and purify desired protein
C To provide optimum growth conditions for the cells
D To maintain the cells in log/exponential phase

The correct answer is:
To provide optimum growth conditions for the cells

Solution:
A bioreactor provides the optimal conditions for achieving the desired product by providing optimum growth conditions (temperature, pH, substrate, salts, vitamins, oxygen)

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the purpose of adding gypsum to cement?

Options:
A To facilitate the hydration of cement
B To slow down the process of setting
C To give a hard mass
D To speed up the process of setting

The correct answer is:
To slow down the process of setting

Solution:
When mixed with water the setting of cement takes place to give a hard mass. The is due to the hydration of molecules of the constituents and their rearrangement. Gypsum is CaSO4.2H2O. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.

Topic: Chemistry, s Block Elements, JEE Main, JEE Main 2023 (08 Apr Shift 1)
What is the purpose of burning the tissue?

Options:
A To identify functional groups
B To classify them biologically
C To determine the elemental composition of living tissues
D To isolate and purify a compound

The correct answer is:
To determine the elemental composition of living tissues

Solution:
The purpose of burning the tissue is to determine the elemental composition of living tissues. This is achieved by fully oxidizing the carbon compounds to gaseous form and removing them. The remaining ash contains inorganic elements and compounds.

Topic: Biology, Biomolecules (B), NEET
What is the purpose of distillation in metal extraction?

Options:
A To produce metal oxides
B To extract metals from ores
C To evaporate impurities
D To obtain pure metal as distillate

The correct answer is:
To obtain pure metal as distillate

Solution:
The main goal of distillation in metal extraction is to evaporate the impure metal to obtain the pure metal as distillate.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
What is the purpose of draining out the used medium and adding fresh medium in a continuous culture system?

Options:
A To achieve the desired product
B To purify the desired protein
C To maintain the cells in log/exponential phase
D To provide optimal growth conditions

The correct answer is:
To maintain the cells in log/exponential phase

Solution:
The purpose of draining out the used medium and adding fresh medium in a continuous culture system is to maintain the cells in their physiologically most active log/exponential phase.

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the purpose of ex situ conservation?

Options:
A To protect threatened animals and plants in special settings
B To maintain animals that have become extinct in the wild
C To protect sacred groves
D To implement in situ conservation

The correct answer is:
To protect threatened animals and plants in special settings

Solution:
In the ex situ approach, threatened animals and plants are taken out of their natural habitat and placed in a special setting where they can be protected and given special care.

Topic: Biology, Biodiversity and its Conservation, NEET
What is the purpose of filtration after boiling hard water to remove temporary hardness?

Options:
A To increase the temperature of water
B To improve the taste of water
C To remove any remaining hydrogen carbonates
D To remove dissolved gases from water

The correct answer is:
To remove any remaining hydrogen carbonates

Solution:
Filtration after boiling hard water helps remove any remaining hydrogen carbonates and the precipitates formed during boiling, resulting in soft water.

Topic: Chemistry, Hydrogen, NEET
What is the purpose of frogs in the ecosystem?

Options:
A to maintain ecological balance
B to provide food for other animals
C to protect crops
D all of the above

The correct answer is:
all of the above

Solution:
Frogs serve as an important link of the food chain and food web in the ecosystem, they eat insects and protect crops, and help maintain ecological balance.

Topic: Biology, Structural Organisation in Animals, NEET
What is the purpose of Le Chatelier's principle in predicting the effect of concentration changes on equilibrium?

Options:
A To predict the exact outcome of concentration changes.
B To ensure that equilibrium remains unchanged.
C To provide a qualitative prediction of the direction in which the equilibrium will shift.
D To describe the kinetics of the reaction.

The correct answer is:
To provide a qualitative prediction of the direction in which the equilibrium will shift.

Solution:
Le Chatelier's principle provides a qualitative prediction of how the equilibrium will shift in response to changes in concentration.

Topic: Chemistry, Chemical Equilibrium, NEET
What is the purpose of measuring heat change at constant pressure?

Options:
A To calculate the heat capacity of the calorimeter
B To determine the heat evolved or absorbed during a reaction
C To maintain a controlled temperature inside the calorimeter
D To measure the change in volume of the reactants

The correct answer is:
To determine the heat evolved or absorbed during a reaction

Solution:
Measuring heat change at constant pressure allows us to determine the heat evolved or absorbed during a chemical reaction, which is often referred to as the enthalpy change (∆rH).

Topic: Chemistry, Thermodynamics (C), NEET
What is the purpose of meiosis?

Options:
A To increase the chromosome number by half
B To reduce the chromosome number by half
C To maintain the chromosome number in the parent cell
D To increase the chromosome number in the daughter cell

The correct answer is:
To reduce the chromosome number by half

Solution:
Meiosis is called the reduction division since it reduces the chromosome number by half while making the gametes. The purpose of meiosis is to form haploid cells, which are involved in sexual reproduction, from diploid cells.

Topic: Biology, Cell Cycle and Cell Division, NEET
What is the purpose of the platinum electrodes coated with platinum black in the conductivity cell?

Options:
A To increase the cell constant
B To decrease the resistance of the solution
C To maintain a constant temperature
D To provide a conductive surface

The correct answer is:
To provide a conductive surface

Solution:
The platinum electrodes coated with platinum black are used to provide a conductive surface.

Topic: Chemistry, Electrochemistry, NEET
What is the purpose of the pleural fluid in the lungs?

Options:
A To maintain the shape of the lungs
B To reduce friction on the lung surface
C To protect the lungs from external factors
D To provide structural support for the lungs

The correct answer is:
To reduce friction on the lung surface

Solution:
The lungs are covered by a double layered pleura, with pleural fluid between them. This fluid helps to reduce friction on the lung surface, allowing for smooth movement of the lungs during breathing.

Topic: Biology, Breathing and Exchange of Gases, NEET
What is the purpose of the sodium-potassium pump in a resting neuron?

Options:
A To maintain the ionic gradients
B To depolarise the membrane
C To hyperpolarise the membrane
D To polarise the membrane

The correct answer is:
To maintain the ionic gradients

Solution:
The sodium-potassium pump maintains the ionc gradients and potentials.

Topic: Biology, Neural Control and Coordination, NEET
What is the purpose of the thick wall called pericarp in the fruit of flowering plants?

Options:
A To develop into the embryo
B To remain attached to the plant
C To wither and fall off
D To provide protection

The correct answer is:
To provide protection

Solution:
In flowering plants, the fruit develops a pericarp to provide protection.

Topic: Biology, Reproduction in Organisms, NEET
What is the purpose of these defects in ionic solids?

Options:
A To increase the electrical conductivity
B To maintain electrical neutrality
C To enhance the density of the substance
D To create dislocations in the crystal lattice

The correct answer is:
To maintain electrical neutrality

Solution:
The purpose of Schottky and Frenkel defects in ionic solids is to maintain electrical neutrality.

Topic: Chemistry, Solid State, NEET
What is the purpose of using a thermostable DNA polymerase in PCR?

Options:
A To degrade the DNA
B To extend the primers
C To remain active during the high temperature induced denaturation of double stranded DNA
D To amplify the DNA

The correct answer is:
To remain active during the high temperature induced denaturation of double stranded DNA

Solution:
The purpose of using a thermostable DNA polymerase in PCR is to remain active during the high temperature induced denaturation of double stranded DNA)

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the quantity of sugar charcoal remaining behind after charring 17.1 g sugar using conc. $\mathrm{H}_2 \mathrm{SO}_4$ under ideal conditions?

Options:
A 7.2 g
B 14.4 g
C 10.5 g
D 11.4 g

The correct answer is:
7.2 g

Solution:
$\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11} \underset{-11 \mathrm{H}_2 \mathrm{O}}{\longrightarrow} 12 \mathrm{C}$
$\frac{17.1}{342}=0.05 \text { moles } 0.6 \mathrm{~mol}$
Mass of charcoal $=0.06 \times 12=7.2 \mathrm{~g}$

Topic: Chemistry, Some Basic Concepts of Chemistry, MHT CET, MHT CET 2022 (11 Aug Shift 1)
What is the radius (in cm) of the imaginary concentric sphere that divides the electrostatic field of a metal sphere of a radius 20 cm & a charge of 8ââÎ¼C in two regions of identical energy?

Options:

The correct answer is:
40

Solution:
The energy between shell 1 & 2=energy behind shell 2.
energy between shall 1 & 2 =â«r=ar=b12Îµ0KQr22Ã4Ïr2dr
=Îµ0K2Q22Ã4Ïâ-1rab=Îµ0K2Q22ââ1a-1b
Energy beyond shell 2=â«r=br=â12Îµ0KQr22Ã4Ïr2âdr
=12â0K2Q2Ã4Ï1b
â´ 12Îµ0K2Q2Ã4Ï 1a-1b
=12Îµ0K2Q2Ã4Ï1b
1a=2b
b=2a
a=20 cm
b=40 cm

Topic: Physics, Electrostatics, JEE Main