datavorous/entrance-exam-dataset huggingface dataset:
Which of the following statements is correct for the manufacture of sulphuric acid by contact process?

Options:
A V2O5 is used for catalytic oxidation of SO2 to SO3 .
B SO3 is absorbed in concentrated sulphuric acid.
C SO3 is directly absorbed in water.
D Both the statements V2O5 is used for catalytic oxidation of SO2 to SO3 and SO3 is absorbed in concentrated sulphuric acid are correct

The correct answer is:
Both the statements V2O5 is used for catalytic oxidation of SO2 to SO3 and SO3 is absorbed in concentrated sulphuric acid are correct

Solution:
The Contact Process is used in the manufacture of sulphuric acid. The Contact Process:
Step 1: Make sulphur dioxide
Step 2: Convert sulphur dioxide into sulphur trioxide (The reversible reaction at the heart of the process).
Step 3: Convert sulphur trioxide into concentrated sulphuric acid.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following statements is correct for the 'nodes of Ranvier' in nerves?

Options:
A Neurilemma is discontinuous
B Myelin sheath is discontinuous
C Both neurilemma and myelin sheath are discontinuous
D Covered by myelin sheath

The correct answer is:
Myelin sheath is discontinuous

Solution:
Neurons are the chief functional units of the nervous system. An ordinary neuron has a soma or cyton and long thread called axon which is enclosed in a multilayered myelin sheath made by Schwann cells. The myelin sheath is interrupted at the spaces between Schwann cells to form gaps. These gaps are called Nodes of Ranvier.
These nodes and the myelin sheath create a condition that speeds up the nerve impulses.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following statements is correct for the phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits?

Options:
A In all protochordates, notochord extends from head to tail region and is persistent throughout the life.
B The members of the class to which Myxine belongs show the presence of a sucking and circular mouth without jaws.
C Members of the class Osteichthyes show the presence of an air bladder, a streamlined body and four gills covered by operculum.
D The members of the class to which the frog belongs are cold blooded, show external fertilization and a three chambered heart i.e. one auricle and two ventricles.

The correct answer is:
The members of the class to which Myxine belongs show the presence of a sucking and circular mouth without jaws.

Solution:
The phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits is Phylum Chordata. It is divided into three sub-phyla i.e. Urochordata, Cephalochordata and Vertebrata. Urochordates and Cephalochordates are together referred to as protochordates. Urochordates show the presence of notochord only in the larval tail. Cephalochordates show the presence of notochord from head to tail and is persistent throughout life. Myxine belongs to the class Cyclostomata. Its members show the presence of sucking circular mouth without jaws. The body is devoid of scales and paired fins. Members of the class Osteichthyes show the presence of an air bladder, a streamlined body and four pairs of gills covered by operculum on each side. Frog belongs to the Class Amphibia. The members of this class are cold blooded, show external fertilization and have a three chambered heart i.e. two auricles and one ventricle.

Topic: Biology, Animal Kingdom, NEET
Which of the following statements is correct for the spontaneous adsorption of a gas?

Options:
A ∆S is negative and therefore, ∆H should be highly positive
B ∆S is negative and therefore, ∆H should be highly negative
C ∆S is positive and therefore, ∆H should be negative
D ∆S is positive and therefore, ∆H should also be highly positive

The correct answer is:
∆S is negative and therefore, ∆H should be highly negative

Solution:
∆G=∆H-T∆S
∆S=-ve for adsorption
So, ∆H must be -ve to make ∆G=-ve
∆G=∆H-T∆S

Topic: Chemistry, Surface Chemistry, NEET, NEET 2014
Which of the following statements is CORRECT?

I. Heart, the mesodermally derived organ, is situated in the thoracic cavity, in between the two lungs, slightly tilted to the left.
II. During joint diastole, tricuspid and bicuspid valves are open and the semilunar valves are closed.
III. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves.
IV. Neural signals through the sympathetic nerves can increase the rate of heartbeat, the strength of ventricular contraction and thereby the cardiac output.

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

The correct answer is:
I, II, III and IV

Solution:
Heart is derived from mesoderm and it lies in the thoracic cavity between two lungs but slightly to the left. Joint diastole means both the auricles and ventricles are in relaxed state and so auriculoventricular valves are open while semilunar are closed. The heart sounds are lub and dub. Lub is the first heart sound and this is due to closure of AV valves while dub is due to closure of semilunar valves. Sympathetic nervous system works during stress situations and thus increase the heart beat.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following statements is correct regarding the motion of the products when a nucleus at rest in the laboratory frame of reference disintegrates into two smaller nuclei?

Options:
A The products move in the same direction.
B The products move randomly in various directions.
C The products move in opposite directions.
D The direction of motion depends on the specific nucleus involved.

The correct answer is:
The products move in opposite directions.

Solution:
Correct Option is : (C)
The products move in opposite directions.

Topic: Chemistry, Laws of Motion, NEET
Which of the following statements is correct regarding the photoelectric emission of a certain metal with a work function of 4.2 eV when exposed to incident radiation of 330 nm wavelength?

Options:
A Yes, because v>vo
B No, because v< vo
C Yes, because v= vo
D No, because v is irrelevant

The correct answer is:
No, because v< vo

Solution:
Correct Option is : (B)
No, because v< vo

Topic: Chemistry, Dual Nature of Matter, NEET
Which of the following statements is correct when comparing the bond energy and magnetic character of O2+and O2–species?

Options:
A O2+has a higher bond order and is more stable than O2–, and both are paramagnetic.
B O2–has a higher bond order and is more stable than O2+, and both are diamagnetic.
C O2+has a higher bond order and is more stable than O2–, and both are diamagnetic.
D O2–has a higher bond order and is more stable than O2+, and both are paramagnetic.

The correct answer is:
O2+has a higher bond order and is more stable than O2–, and both are paramagnetic.

Solution:
Correct Option is : (A)
O2+has a higher bond order and is more stable than O2–, and both are paramagnetic.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following statements is correct with respect to Blackman's law of limiting factor?

Options:
A Only one factor can be limited in photosynthesis
B Photosynthesis consists of a light and dark reaction
C The trapping of light by chloroplast is temperature dependent
D The trapping of light by chloroplast can occur only if CO2 is present

The correct answer is:
Photosynthesis consists of a light and dark reaction

Solution:
Blackman proposed the 'law of limiting factor and also proved that photosynthesis is photochemical reaction (light reaction) and biochemical reaction (dark reaction).

Topic: Biology, Photosynthesis in Higher Plants, NEET
Which of the following statements is correct with respect to slime molds?

Options:
A They are saprophytic; body plasmodium is naked without cell wall, and spore is dispersed by air.
B They are saprophytic; body plasmodium is with cell wall and spore is dispersed by water.
C They are parasitic; body plasmodium is naked without cell and spore is dispersed by air.
D They are parasitic; body plasmodium is with cell wall and spore is dispersed by water.

The correct answer is:
They are saprophytic; body plasmodium is naked without cell wall, and spore is dispersed by air.

Solution:
Reproduction in slime molds takes place under favourable conditions. Slime molds form an aggregation known as plasmodium (which may grow upto several feet).

Topic: Biology, Biological Classification, NEET
Which of the following statements is correct?

Options:
A The electronic configuration of Cr is [Ar] 3 d 5 , 4 s 1 (Atomic No. of Cr = 24)
B The magnetic quantum number may have a negative value
C In silver atom, 23 electrons have a spin of one type and 24 of the opposite type, (Atomic No. of Ag = 47)
D All of the above

The correct answer is:
All of the above

Solution:
Cr â 1 8 Ar 4 s 1 3 d 5 . (due to stable configuration filled (half filled))
m â - â â¦ - 1 , 0 , + 1 , â¦ + â (Possible Values)
4 7 Ag = 3 6 Kr 5 s 2 4 d 9 â 3 6 Kr 5 s 1 4 d 1 0 (Actual)
Number of electrons with parallel spin =(36/2) + 1 + (10/2) = 24.
Number of electrons with anti-parallel spin =(36/2) + 0 + (10/2) = 23.

Topic: Chemistry, Structure of Atom, NEET
Which of the following statements is false?

Options:
A

Tissues exist within organs which exist within organ systems.

B Communities exist within populations which exist within ecosystems.

C Organelles exist within cells which exist within tissues.

D Communities exist within ecosystems which exist in the biosphere.

The correct answer is:
Communities exist within populations which exist within ecosystems.

Solution:
All the individuals of a species living within a specific area are collectively called a population. Different populations may live in the same specific area. A community is the set of populations inhabiting a particular area. An ecosystem consists of all the living things in a particular area together with the abiotic, or non-living, parts of that environment. At the highest level of organization, the biosphere is the collection of all ecosystems, and it represents the zones of life on Earth. It includes land, water, and portions of the atmosphere.

Topic: Biology, Organisms and Populations, NEET
Which of the following statements is false?

Options:
A HCl molecule has one sigma bond
B Acetylene molecule has three pi bonds and three sigma bonds
C Ethylene molecule has five sigma bonds and one pi bond
D Water molecule has two sigma bonds and two lone pairs

The correct answer is:
Acetylene molecule has three pi bonds and three sigma bonds

Solution:
Here
Acetylene molecule has 3σ bonds and 2π bonds.
H-Cl has only one sigma bond so it is correct.
In water there are 2 sigma bond and 2 lp electrons so it is also correct.

Ethylene has also 5 sigma and one pi bonds so it is also correct.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following statements is false?

Options:
A TMV has a double-stranded RNA molecule.
B Most plant viruses are RNA viruses.
C The bacteriophage has a double-stranded DNA molecule.
D Most animal viruses lack ssDNA and can have dsDNA as their genetic material.

The correct answer is:
TMV has a double-stranded RNA molecule.

Solution:
TMV has single stranded RNA as its genetic material. Most plant virus generally have single stranded RNA as its genetic material. Bacteriophages generally have ds DNA as its genetic material. ssDNA is present only in few bacteriophages as their genetic material.

Topic: Biology, Biological Classification, NEET
Which of the following statements is false?

Options:
A Artificial silk is derived from cellulose
B Nylon-66 is an example of elastomer
C The repeat unit in natural rubber is isoprene
D Both starch and cellulose are polymers of glucose

The correct answer is:
Nylon-66 is an example of elastomer

Solution:
Nylon-66 is a fibre as in it the forces of attraction are H-bonding.
All other given statements are true.

Topic: Chemistry, Polymers, NEET, NEET 2012 (Screening)
Which of the following statements is false about covalent bonds?

Options:
A The electrons are shared between atoms to get stable electronic arrangement.
B The bonds are non-directional.
C The strength of the bond depends upon the extent of overlapping.
D The bond may or may not be polar.

The correct answer is:
The bonds are non-directional.

Solution:
Covalent bond is formed by the sharing of electrons or combining the atomic orbitals to form the hybrid orbitals. Hybrid orbitals have the more probability of electron density at one end of the orbital while others end the probability of finding the electron is negligible. Due to this, all covalent bonds are directional in nature.

The strength of the bond depends on the extent of overlapping. More overlapping then stronger will be the bond.

If the electrons are sharing between the two same kinds of atoms then it will form a non-polar molecule. Eg:- H2, N2, and F2 etc.

If the sharing of electrons between the two different kinds of elements then the more electronegative element attracts shared pair of electrons towards itself and gets the partial negative charge corresponding the less electronegative atom carries the partial positive charge. Due to this, there is one dipole generated and these molecules known as polar molecules by consisting polar covalent bonds. Eg:- HCl

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following statements is false for a particle moving in a circle with a constant angular speed?

Options:
A The velocity vector is tangent to the circle
B The acceleration vector is tangent to the circle
C The acceleration vector points to the centre of the circle
D The velocity and acceleration vectors are perpendicular to each other

The correct answer is:
The acceleration vector is tangent to the circle

Solution:
The acceleration vector acts along the radius of the circle.Then given statement is false.

Topic: Physics, Motion In Two Dimensions, NEET
Which of the following statements is false for hormones of the adrenal medulla?

Options:
A They increase alertness
B Increase strength of heart contraction and rate of respiration
C They inhibit the breakdown of lipids and proteins
D They stimulate the breakdown of glycogen and increase glucose level in blood

The correct answer is:
They inhibit the breakdown of lipids and proteins

Solution:
The adrenal medulla secretes two hormones called adrenaline or epinephrine and noradrenaline or norepinephrine (also known as, catecholamines). They are rapidly secreted in response to stress of any kind and during emergency situations, hence called emergency hormones or hormones of Fight or Flight. These hormones increase alertness, pupillary dilation, piloerection (raising of hairs), sweating etc. Both the hormones increase the heartbeat, the strength of heart contraction and the rate of respiration. Catecholamines also stimulate the breakdown of glycogen resulting in an increased concentration of glucose in the blood. In addition, they also stimulate the breakdown of lipids and proteins.

Topic: Biology, Chemical Coordination and Integration, NEET
Which of the following statements is false regarding the "law of segregation"?

Options:
A Law of segregation is also called the law of purity of genes.
B Alleles separate from each other during gametogenesis.
C Segregation of factors is due to the segregation of chromosomes during meiosis.
D Alleles show blending and only one of the characters are recovered in F2.

The correct answer is:
Alleles show blending and only one of the characters are recovered in F2.

Solution:
Law of segregation states that during gamete formation the allele segregate from each other and during gamete formation only one allele enters each gamete. This segregation of allele occurs due to separation of chromosomes during meiosis. The alleles do not show any blending and that both the characters are recovered as such in the F2 generation though one of these is not seen at the F1 stage.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following statements is false?

Options:
A Aqueous humor leak out by canal of schlemm into blood capillaries and again reach upto their veins.
B A transparent, biconvex lens is present just after iris.
C Iris divides the vitreous chamber into two parts, anterior chamber and posterior chamber.
D Aqueous humor and vitreous humor both the fluids are secreted by the glands of ciliary body.

The correct answer is:
Iris divides the vitreous chamber into two parts, anterior chamber and posterior chamber.

Solution:
Iris does not divide the vitreous chamber into two parts, the anterior chamber, and the posterior chamber. Anterior chamber (between cornea and iris), posterior chamber (between iris, zonule fibres, and lens), and the vitreous chamber (between the lens and the retina). The first two chambers are filled with aqueous humor, whereas the vitreous chamber is filled with more viscous vitreous humor.

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

Options:
A Shoot apices those modify themselves into flowering apices, cannot perceive photoperiods.
B Sugarbeet, cabbage and carrots are monocarpic plants.
C To initiate flowering, LDP must be exposed to light for a period less than critical duration.
D Ethephon causes thinning of cotton, cherry & walnut.

The correct answer is:
To initiate flowering, LDP must be exposed to light for a period less than critical duration.

Solution:
Long Day Plants (LDP) requires exposure to light for a period exceeding critical duration to induce flowering. Ethephon hastens fruit ripening in tomatoes and apples and accelerates abscission in flowers and fruits (thinning of cotton, cherry, walnut). Shoot apices those modify themselves into flowering apices, cannot perceive photoperiods. Biennial monocarpic plants that flower and then die in the second season. Some examples are sugar beet, cabbage, carrot, etc

Topic: Biology, Plant - Growth and Development, NEET
Which of the following statements is incorrect?

Options:
A Dissolution of group IA hydroxide is endothermic
B Group IA hydroxide are hygroscopic
C Group IA hydroxides form ionic crystals
D Aqueous solution of group IA hydroxides are strongly basic

The correct answer is:
Dissolution of group IA hydroxide is endothermic

Solution:
As during the dissolution of group IA hydroxides energy is released in large amount i.e. it is exothermic in nature so statement (A) is wrong. Rest statements are correct as hydroxide of group IA are hygroscopic, ionic crystalline and strongly basic.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following statements is incorrect?

Options:
A C2H5Br reacts with alc. KOH to form C2H4
B C2H5Br when treated with metallic sodium gives ethane
C C2H5Br when treated with sodium ethoxide forms diethyl ether
D C2H5Br with AgCN forms ethyl isocyanide

The correct answer is:
C2H5Br when treated with metallic sodium gives ethane

Solution:
C2H5Br+alc.KOH→C2H4+H2O+KBr
C2H5Br+2Na+Br-C2H5→C2H5-C2H5Butane+2NaBr

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following statements is incorrect?

Options:
A The number of mitochondria in a cell do not correspond to the function of cell.
B Mitochondria are common to both plant and animal cells.
C Mitochondria and Chloroplast are semiautonomous organelle
D Mitochondria divides by fission to increase its number

The correct answer is:
The number of mitochondria in a cell do not correspond to the function of cell.

Solution:
Number of mitochondria depends on the metabolic activity, and function performed by the cell, cell with more metabolic activity has more number of mitochondria. Maximum mitochondria are present in flight muscle cells of birds.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following statements is incorrect?

Options:
A The body of platyhelminthes bears suckers and most of them are endoparasites.
B The sedimentary form of colentrata is polyp.
C Closed circulatory system, respiratory pigment dissolved in plasma and setae are the unique features of annelida.
D Spiny skin, closed circulatory system and developed sense organs are present in echinodermata.

The correct answer is:
Spiny skin, closed circulatory system and developed sense organs are present in echinodermata.

Solution:
Almost 80 % of the flatworms are parasitic in nature, while few are free living platyhelminthes. The free-living forms are scavengers or predators. The parasitic species feed on the tissues of the host organism in which they live. Hooks and suckers are present in parasitic forms.
Coelentrata exhibit 2 forms sessile polyp forms and swimming medusa forms.
They have a well-developed circulatory and digestive system. Body contains haemoglobin, which gives them a red colour.

Topic: Biology, Animal Kingdom, NEET
Which of the following statements is incorrect?

Options:
A All animals do not depend directly on plants for their food needs.
B The death of the organism is the beginning of the grazing food chain.
C Those animals that depends on the primary carnivores for food are labeled as tertiary consumers.
D Primary producers in an aquatic ecosystem are various species like phytoplanktons, algae and higher plants.

The correct answer is:
The death of the organism is the beginning of the grazing food chain.

Solution:
All animals depends on plants (directly or indirectly) for their food needs, they are hence called consumers and also heterotrophs. Animals that depends on the primary carnivores for food are labeled as tertiary consumers. The energy trapped by the producer is passed on to the consumer or the organism dies, death of the organism is the beginning of detritus food chain.

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

Options:
A A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma.
B A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group.
C Blood group is designated based on the presence of antibodies in the blood plasma.
D A person of the AB blood group is a universal recipient.

The correct answer is:
Blood group is designated based on the presence of antibodies in the blood plasma.

Solution:
Blood group is designated based on the presence of antigen in the blood plasma.

Topic: Biology, Body Fluids and Circulation, NEET
Which of the following statement(s) is incorrect?

Options:
A $\alpha$-carbon of $\alpha$-amino acid is asymmetric
B All proteins are found in the L-form
C Human body can synthesize all proteins they need
D At $\mathrm{pH}=7$ both amino and carboxylic groups exist in the ionized form

The correct answer is:
All proteins are found in the L-form

Solution:
Amino acids are organic compounds that contain amine \(\left(-\mathrm{NH}_2\right)\) and carboxyl \((-\mathrm{COOH})\) functional groups, along with a side chain (R group) specific to each amino acid. a-carbon of cc-amino acid is asymmetric. Hence this statement is true.
Proteins exist in both D and L -form.
Human body can synthesize all proteins they need.
At \(\mathrm{pH}=7\), both amino and carboxylic groups exist in ionised form.

Topic: Chemistry, Biomolecules, NEET, NEET 2002
Which of the following statements is incorrect?

Options:
A Morels and truffles are edible delicacies.
B Claviceps is a source of many alkaloids and LSD.
C Conidia are produced exogenously and ascospores endogenously.
D Yeasts have filamentous bodies with long thread-like hyphae.

The correct answer is:
Yeasts have filamentous bodies with long thread-like hyphae.

Solution:
Yeasts are unicellular eukaryotic fungi with completely different properties from those of bacteria, which are Prokaryotic microorganisms. Yeast contains almost the same organelles of a mature eukaryotic cell. Nucleus, Golgi apparatus, mitochondria, endoplasmic reticulum, vacuole, and cytoskeleton are the most important one.

Topic: Biology, Biological Classification, NEET, NEET 2019 (All India)