datavorous/entrance-exam-dataset huggingface dataset:
Why is there no distinction needed between instantaneous speed and magnitude of instantaneous velocity?

Options:
A Because speed is a scalar quantity, while velocity is a vector quantity.
B Because both instantaneous speed and magnitude of instantaneous velocity are always positive.
C Because instantaneous speed and magnitude of instantaneous velocity have the same units.
D Because they are equal by definition, as speed and magnitude of velocity measure the same physical quantity.

The correct answer is:
Because they are equal by definition, as speed and magnitude of velocity measure the same physical quantity.

Solution:
Correct Option is : (D)
Because they are equal by definition, as speed and magnitude of velocity measure the same physical quantity.

Topic: Chemistry, Motion In One Dimension, NEET
Why is there no interface between gases due to complete miscibility?

Options:
A Gases repel each other
B Gases have different densities
C Gases mix completely
D Gases have different temperatures

The correct answer is:
Gases mix completely

Solution:
The paragraph explains that due to complete miscibility, there is no interface between gases.

Topic: Chemistry, Surface Chemistry, NEET
Why is there no work done during a reaction in a bomb calorimeter?

Options:
A Because the bomb is sealed
B Because the bomb is small
C Because the reaction is not exothermic
D Because the reaction is carried out at constant pressure

The correct answer is:
Because the bomb is sealed

Solution:
There is no work done during a reaction in a bomb calorimeter because the bomb is sealed, preventing any changes in volume and ensuring constant volume conditions.

Topic: Chemistry, Thermodynamics (C), NEET
Why is thionyl chloride preferred for replacing the hydroxyl group in alcohols?

Options:
A It forms alkyl halide along with gases SO2 and HBr.
B It forms alkyl halide along with gases SO2 and H2O.
C It forms alkyl halide along with gases SO2 and HCl.
D It forms alkyl halide along with gases CO2 and HCl.

The correct answer is:
It forms alkyl halide along with gases SO2 and HCl.

Solution:
Thionyl chloride is preferred because in this reaction alkyl halide is formed along with gases SO2 and HCl.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why is thionyl chloride (SOCl2) preferred for converting carboxylic acids to acyl chlorides over PCl5 and PCl3?

Options:
A Thionyl chloride is less expensive.
B Thionyl chloride produces fewer byproducts.
C PCl5 and PCl3 are gaseous and escape the reaction mixture.
D PCl5 and PCl3 are more reactive.

The correct answer is:
PCl5 and PCl3 are gaseous and escape the reaction mixture.

Solution:
Thionyl chloride (SOCl2) is preferred because PCl5 and PCl3, when used for the same reaction, produce gaseous byproducts that escape the reaction mixture, making it difficult to handle and purify the desired product.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why is thionyl chloride (SOCl2) preferred for the reaction involving carboxylic acids and chlorine atom replacement?

Options:
A It is less expensive than the other reagents.
B It is a gas and escapes the reaction mixture.
C It is more reactive than the other reagents.
D It is a solid reagent.

The correct answer is:
It is a gas and escapes the reaction mixture.

Solution:
Thionyl chloride (SOCl2) is preferred because it is a gas and escapes the reaction mixture, making the purification of the products easier, as mentioned in the paragraph.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why is vivipary an undesirable character for annual crop plants?

Options:
A it reduces the vigour of the plant
B it adversely affects the fertility of the plant
C the seeds exhibit long dormancy
D the seeds cannot be stored under normal conditions for the next season.

The correct answer is:
the seeds cannot be stored under normal conditions for the next season.

Solution:
Annual plants complete their life cycle in one season, wherein seeds are produced, germinated and the mature plant hence produced, dies within the same season. In vivipary, seeds or spores germinate in situ on mature plants even before they are released which is not possible for annual plants as in them, the mature plants fail to store seeds. This is a result of it dying after seedproduction.
Related Theory
Seeds are structures that contain a young plant inside a protective coating. One reason why seed plants are so numerous is that they produce seeds. Seed plants do not need water in their environment to reproduce like seedless plants do. Even though different kinds of seeds look different from each other, they all have a similar structure. A seed has three important parts: an embryo, stored food, and a seed coat. All seed plants share two characteristics. They have vascular tissue and use seeds to reproduce. In addition, they all have body plans that include leaves, stems, and roots. Most seed plants live on land.

Topic: Biology, Plant Kingdom, NEET, NEET 2005
Why is vivipary an undesirable character for annual crop plants?

Options:
A It reduces the vigour of the plant
B It adversely affects the fertility of the plant
C The seeds exhibit long dormancy
D The seeds cannot be stored under normal conditions for the next season

The correct answer is:
The seeds cannot be stored under normal conditions for the next season

Solution:
Vivipary is the process where the seeds formed germinate while been attached to the parent plant body of the fruit. In this process, the seed has turned into a plantling and growing to be a plant while been attached to the parent plant or within the fruit itself. It is commonly observed in tomato, mangroves. Such process occurs when the condition for the seed germination is favourable. Annual crop plants are those group that produce for only one growing season. For the next season the seeds of the plant are stored. If such plants slow vivipary then it will be not feasible to store seeds as the seeds have already germinated. They cannot be used for next season.

Topic: Biology, Plant - Growth and Development, NEET
Why is water an excellent solvent for the transportation of ions and molecules in biological processes?

Options:
A Due to its low heat capacity
B Due to its low boiling point
C Due to its high freezing point
D Due to its high heat capacity

The correct answer is:
Due to its high heat capacity

Solution:
Water's high heat capacity makes it an excellent solvent for the transportation of ions and molecules required for plant and animal metabolism in biological processes.

Topic: Chemistry, Hydrogen, NEET
Why is water considered a crucial compound for the survival of all life forms?

Options:
A Because it is a source of energy
B Because it is a greenhouse gas
C Because it is a universal solvent and essential for biological processes
D Because it is a rare and precious resource

The correct answer is:
Because it is a universal solvent and essential for biological processes

Solution:
Water is considered crucial for the survival of all life forms because it is a universal solvent and essential for various biological processes.

Topic: Chemistry, Hydrogen, NEET
Why is water considered essential for life?

Options:
A It provides energy for living organisms.
B It is a source of nutrients.
C It is required for photosynthesis.
D It is involved in various biological processes.

The correct answer is:
It is involved in various biological processes.

Solution:
Water is considered essential for life because it plays a crucial role in various biological processes, such as hydration, transportation of nutrients, temperature regulation, and chemical reactions within living organisms.

Topic: Chemistry, Environmental Chemistry, NEET
Why is water hyacinth considered a scourge of water bodies?

Options:
A It has beautiful flowers and leaves
B It drains oxygen from the water leading to death of fishes
C It is a very slow grower
D None of the above

The correct answer is:
It drains oxygen from the water leading to death of fishes

Solution:
Water hyacinth is considered a scourge of water bodies because it drains oxygen from the water leading to death of fishes.

Topic: Biology, Reproduction in Organisms, NEET
Why is water molecule polar?

Options:
A Water molecules have a bent shape.
B Oxygen is more electronegative than hydrogen.
C Water molecules form hydrogen bonds.
D Water molecules are symmetrical.

The correct answer is:
Oxygen is more electronegative than hydrogen.

Solution:
Correct Option is : (B)
Oxygen is more electronegative than hydrogen.

Topic: Chemistry, Hydrogen, NEET
Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms?

Options:
A The Wurtz reaction is highly exothermic and may lead to uncontrollable reactions when attempting to prepare alkanes with an odd number of carbon atoms.
B The Wurtz reaction can only be used for the synthesis of alkanes containing an even number of carbon atoms, and it is not feasible to obtain alkanes with an odd number of carbon atoms using this method.
C The Wurtz reaction is not suitable for the preparation of alkanes containing odd numbers of carbon atoms because it results in the formation of a mixture of products, making it difficult to isolate the desired alkane.
D The Wurtz reaction is not suitable for the preparation of alkanes regardless of the number of carbon atoms, as it is an inefficient and outdated method.

The correct answer is:
The Wurtz reaction is not suitable for the preparation of alkanes containing odd numbers of carbon atoms because it results in the formation of a mixture of products, making it difficult to isolate the desired alkane.

Solution:
Correct Option is : (C)
The Wurtz reaction is not suitable for the preparation of alkanes containing odd numbers of carbon atoms because it results in the formation of a mixture of products, making it difficult to isolate the desired alkane.

Topic: Chemistry, Hydrocarbons, NEET
Why may a metallic sample appear to be isotropic even though a single crystal is anisotropic?

Options:
A Because metals are transparent
B Because metals are highly conductive
C Because individual crystals are randomly oriented
D Because metals have a two-dimensional structure

The correct answer is:
Because individual crystals are randomly oriented

Solution:
A metallic sample may appear to be isotropic even though a single crystal is anisotropic because individual crystals in the sample are randomly oriented, as mentioned in the paragraph.

Topic: Chemistry, Solid State, NEET
Why may conventional agricultural production not be able to meet the demand for food?

Options:
A Decrease in human and animal population
B Increase in human and animal population
C Shift from grain to meat diets
D Lack of good protein source

The correct answer is:
Increase in human and animal population

Solution:
The demand for food cannot be met by conventional agricultural production because the human and animal population is increasing at a faster rate.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Why Mendel can be considered lucky?

Options:
A All seven pairs of contrasting characters selected by him, showed complete dominance and all the allelic pair combinations which he considered for dihybrid cross showed independent assortment.
B All the allelic pair combinations which he considered for dihybrid cross showed linkage.
C Pea varieties expressed intermediate characters as compared to parents.
D He used heterozygous plants as parents in monohybrid cross.

The correct answer is:
All seven pairs of contrasting characters selected by him, showed complete dominance and all the allelic pair combinations which he considered for dihybrid cross showed independent assortment.

Solution:
Apart from complete dominance, some organisms show co-dominance and incomplete dominance. If Mendel would have observed co-dominance and incomplete dominance he would be confused and would not be able to deduce the law of dominance. Also, the phenomenon of linkage is seen in some genes where independent assortment is not seen. If Mendel would have observed it he would be confused and would not be able to deduce the law of independent assortment. Thus Mendel was lucky as he didn't encounter these deviations.

Topic: Biology, Principles of Inheritance and Variation, NEET
Why Mendel's work was not recognized till 1900?

Options:
A His work could not be widely published.
B His concept of factor (stable and discrete units that control expression of trait) was not accepted by his contemporaries.
C His approach of using mathematics to explain biological phenomenon was totally new and unacceptable by many of the biologists of his time.
D All of these

The correct answer is:
All of these

Solution:
Mendel was successful in his hybridization experiment but his work was not recognized during his life time as his work was not widely publisised due to lack of means of communication. His concept of factor as a stable discrete unit was not accepted, and use of mathematical and statistical method to explain his results was not accepted by all.

Topic: Biology, Principles of Inheritance and Variation, NEET
Why might the interpretation of Kb values based solely on +I or -I effects be inadequate?

Options:
A +I and -I effects do not affect basicity.
B Other factors like solvation and steric effects also play a role.
C Kb values are not related to basicity.
D Amines do not have substituents.

The correct answer is:
Other factors like solvation and steric effects also play a role.

Solution:
+I and -I effects are important but not the only factors affecting basicity. Solvation and steric effects can also influence the basic strength of amines.

Topic: Chemistry, Amines, NEET
Why must vitamin C be supplied regularly in diet?

Options:
A Vitamin C is rapidly metabolized and excreted from the body.
B Vitamin C is water soluble therefore it is readily excreted in urine and can’t be stored in our body.
C Vitamin C is required for energy production and is constantly consumed in metabolic processes.
D Vitamin C is sensitive to heat and is destroyed during cooking.

The correct answer is:
Vitamin C is water soluble therefore it is readily excreted in urine and can’t be stored in our body.

Solution:
Correct Option is : (B)
Vitamin C is water soluble therefore it is readily excreted in urine and can’t be stored in our body.

Topic: Chemistry, Biomolecules, NEET
Why precipitate of copper sulphide is not obtained when H2S(g) is passed through K2[Cu(CN)4] solution?

Options:
A H2S(g) does not react with copper sulphate in solution.
B because K2[Cu(CN)4] is a very stable complex which does not ionise to give Cu2+ions when added to water
C Copper sulphate is a strong reducing agent and prevents the formation of copper sulphide.
D The concentration of H2S(g) is insufficient to form a precipitate with copper sulphate.

The correct answer is:
because K2[Cu(CN)4] is a very stable complex which does not ionise to give Cu2+ions when added to water

Solution:
Correct Option is : (B)
because K2[Cu(CN)4] is a very stable complex which does not ionise to give Cu2+ions when added to water

Topic: Chemistry, Coordination Compounds, NEET
Why predator are prudent in nature?

Options:
A They all kill prey
B They feed on dead organism
C They do not over exploit its prey
D They are too efficient to kill their prey

The correct answer is:
They do not over exploit its prey

Solution:
Predators are prudent in nature, if predator is too efficient and overexploits its prey, then the prey might become extinct and following it, the predator will also become extinct for lack of food.

Topic: Biology, Organisms and Populations, NEET
Why refractory metals are used in construction of furnaces

Options:
A They can withstand high temperature
B They are chemically inert
C Their melting point is high
D None of these

The correct answer is:
They can withstand high temperature

Solution:
Refractory used in furnaces are composed of oxides of Si,Al,Mg and Ca these can withstand
high temperature.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why should drugs not be taken in doses higher than recommended?

Options:
A They lose their therapeutic effect
B They become less toxic
C They may become ineffective
D They can be potential poisons

The correct answer is:
They can be potential poisons

Solution:
Most drugs used as medicines can be potential poisons if taken in doses higher than recommended.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why should the monomers used in addition polymerisation through free radical pathway be very pure?

Options:
A Pure monomers are required to reduce the cost of polymerization.
B Pure monomers are required to increase the reaction rate.
C Pure monomers are required because even the traces of impurities may act like inhibitors which leads to the formation of polymers with shorter chain length.
D Pure monomers are required to enhance the colour of the polymer.

The correct answer is:
Pure monomers are required because even the traces of impurities may act like inhibitors which leads to the formation of polymers with shorter chain length.

Solution:
Correct Option is : (C)
Pure monomers are required because even the traces of impurities may act like inhibitors which leads to the formation of polymers with shorter chain length.

Topic: Chemistry, Polymers, NEET
Why should the organic solvent and the aqueous solution be immiscible with each other in differential extraction?

Options:
A To create a homogeneous solution
B To avoid forming layers
C To form two distinct layers that can be separated
D To increase the solubility of the compound

The correct answer is:
To form two distinct layers that can be separated

Solution:
Immiscibility between the organic solvent and the aqueous solution is essential to form two distinct layers that can be separated.

Topic: Chemistry, General Organic Chemistry, NEET
Why should the Rh group be matched before transfusions?

Options:
A To avoid formation of specific antibodies.
B To avoid incompatibility.
C To avoid erythroblastosis foetalis.
D To avoid anaemia and jaundice.

The correct answer is:
To avoid formation of specific antibodies.

Solution:
To avoid formation of specific antibodies, the Rh group be matched before transfusions.

Topic: Biology, Body Fluids and Circulation, NEET
Why should unleaded petrol be used in vehicles equipped with a catalytic converter?

Options:
A It is cheaper
B It is more easily available
C Lead in the petrol inactivates the catalyst
D It produces less emissions

The correct answer is:
Lead in the petrol inactivates the catalyst

Solution:
Motor vehicles equipped with catalytic converter should use unleaded petrol because lead in the petrol inactivates the catalyst.

Topic: Biology, Environmental Issues, NEET
Why should you blow over, not under, a piece of paper to keep it horizontal?

Options:
A Blowing over the paper increases air velocity and lowers pressure above it.
B Blowing under the paper creates a downward force due to increased air pressure.
C Blowing under the paper increases air velocity and raises pressure above it.
D Blowing over the paper creates a vacuum effect, keeping it horizontal.

The correct answer is:
Blowing over the paper increases air velocity and lowers pressure above it.

Solution:
Correct Option is : (A)
Blowing over the paper increases air velocity and lowers pressure above it.

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Why the Be2molecule does not exist according to molecular orbital theory?

Options:
A The molecular orbital theory suggests that Be2does exist because it forms a stable bonding molecular orbital.
B According to molecular orbital theory, Be2does not exist because the 2s atomic orbitals of two beryllium atoms do not effectively overlap to form a stable molecular orbital.
C Be2exists because it forms a strong pi (π) bond due to the overlap of 2p atomic orbitals.
D Molecular orbital theory is not applicable to the analysis of the Be2molecule.

The correct answer is:
According to molecular orbital theory, Be2does not exist because the 2s atomic orbitals of two beryllium atoms do not effectively overlap to form a stable molecular orbital.

Solution:
Correct Option is : (B)
According to molecular orbital theory, Be2does not exist because the 2s atomic orbitals of two beryllium atoms do not effectively overlap to form a stable molecular orbital.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why was a change in the Bohr Model of atom required? Due to which important development(s), concept of movement of an electron in an orbit was replaced by, the concept of probability of finding electron in an orbital? What is the name given to the changed model of atom?

Options:
A The Bohr Model failed to explain the spectrum of multi-electron atoms, leading to the development of Quantum Mechanics. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Quantum Mechanical Model.
B The Bohr Model failed to explain the dual nature of electrons. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Quantum Mechanical Model.
C The Bohr Model was unable to predict the behavior of atoms in strong magnetic fields. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Quantum Mechanical Model.
D The Bohr Model couldn't explain the formation of ions in chemical reactions. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Electron Cloud Model.

The correct answer is:
The Bohr Model failed to explain the spectrum of multi-electron atoms, leading to the development of Quantum Mechanics. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Quantum Mechanical Model.

Solution:
Correct Option is : (A)
The Bohr Model failed to explain the spectrum of multi-electron atoms, leading to the development of Quantum Mechanics. The concept of electron cloud replaced the concept of definite orbits, and the model is known as Quantum Mechanical Model.

Topic: Chemistry, Structure of Atom, NEET
Why was a public interest litigation filed in the Supreme Court of India?

Options:
A Due to increasing number of vehicles
B Due to increasing levels of air-pollution
C Due to difficulty of laying down pipelines
D Due to interruption in supply of CNG

The correct answer is:
Due to increasing levels of air-pollution

Solution:
Air pollution problems in Delhi became so serious that a public interest litigation (PIL) was filed in the Supreme Court of India.

Topic: Biology, Environmental Issues, NEET
Why was Dobereiner's Law of Triads dismissed?

Options:
A It was too complex.
B It did not apply to any elements.
C It seemed to work only for a few elements and was considered a coincidence.
D It was proven to be incorrect.

The correct answer is:
It seemed to work only for a few elements and was considered a coincidence.

Solution:
Dobereiner's Law of Triads was dismissed because it seemed to work only for a few elements and was considered a coincidence.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why was the government forced to take up serious measures to check the population growth rate?

Options:
A Decrease in death rate and maternal mortality rate
B Increase in number of people in reproducible age
C Lack of basic requirements
D All of the above

The correct answer is:
Lack of basic requirements

Solution:
Such an alarming growth rate could lead to an absolute scarcity of even the basic requirements, i.e., food, shelter and clothing, in spite of significant progress made in those areas.

Topic: Biology, Reproductive Health, NEET
Why was the use of DDT eventually banned in India?

Options:
A It was ineffective against pests
B It caused adverse effects on the environment and health
C It was too expensive for widespread use
D It led to the development of resistant pests

The correct answer is:
It caused adverse effects on the environment and health

Solution:
The use of DDT was banned in India due to its adverse effects on the environment and health.

Topic: Chemistry, Environmental Chemistry, NEET