datavorous/entrance-exam-dataset huggingface dataset:
In the circuit shown the diode will conduct current for a

Options:
A complete cycle of ac input
B complete positive cycle of ac input
C voltage between 4 V and 6 V of the positive half cycle of input ac
D voltage below 4V of the positive half cycle of input ac

The correct answer is:
voltage between 4 V and 6 V of the positive half cycle of input ac

Solution:
Only for voltage between 4 V and 6 V of is positive cycle of input ac the diode is forward biased. So conducts for only this part of positive cycle.

Topic: Physics, Semiconductors, NEET
In the circuit shown the ideal ammeter A reads a current of I1 A . Now the source of e.m.f. and the ammeter are physically interchanged, i.e. the source is put between B and C and the ammeter between A and B . The ammeter now reads a current of I2 A . Then -

Options:
A I1>I2
B I1=I2
C I1<I2
D The relation between I1 and I2 will depend upon the relative value of resistances R1, R2 and R3

The correct answer is:
I1=I2

Solution:
I1 =R2R2+R3ÃER1+R2R3R2+R3
= ER2R1R2+R2R3+R3R1
After interchanging ammeter and source of e.m.f., new current
âI2 = R2R1+R2ER3+R1R2R1+R2
ER2R1R2+R2R3+R3R1=I1

Topic: Physics, Current Electricity, NEET
In the circuits shown below, the readings of the voltmeters and the ammeters will be,

Options:
A V2>V1 and i1=i2
B V1=V2 and i1>i2
C V1=V2 and i1=i2
D V2>V1 and i1>i2

The correct answer is:
V1=V2 and i1=i2

Solution:
For an ideal voltmeter, resistance is infinite RV=∞, so it will not draw any amount of current from the circuit and for ideal ammeter resistance is zero.

Then for the first figure R1=10 Ω, RV=∞ and both are in a parallel arrangement, so

1Req=1R1+1RV⇒1Req=110+1∞⇒Req = 10 Ω

and current in the first circuit is, i1=V1Req=1010= 1 A

So, for the first circuit, ammeter and voltmeter readings are V1=10 V, i1=1 A, respectively.

For the second figure voltmeter and resistant of 10 Ω are in series and also connected parallel to another resistant of 10 Ω. So, equivalent resistant is

1R'eq=1R1+1R2+RV⇒1R'eq=110+110+∞=110+0=110⇒R'eq=10 Ω

∴ Current in the circuit is, i2=V2Req'=1010=1 A,

∴ Ammeter and voltmeter readings for the second circuit is V2=10 V, i2=1 A

∴ For both the circuit is
V1=V2=10 V, i1=i2=1 A

Topic: Physics, Current Electricity, NEET, NEET 2019 (All India)
In the classical concept of bonding, what does an integral bond order of 2 represent?

Options:
A Single bond
B Double bond
C Triple bond
D Quadruple bond

The correct answer is:
Double bond

Solution:
In the classical concept, an integral bond order of 2 corresponds to a double bond.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
In the cleavage of ethers, which hydrogen halide is the most reactive?

Options:
A HBr
B HI
C HCl
D They are equally reactive.

The correct answer is:
HI

Solution:
HI is the most reactive among hydrogen halides in the cleavage of ethers.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the cleavage of ethers with hydrogen halides, why is the term "drastic conditions" used?

Options:
A Because the reaction is very slow
B Because it requires a high concentration of ethers
C Because it involves high temperatures and excess hydrogen halides
D Because it produces a large amount of byproducts

The correct answer is:
Because it involves high temperatures and excess hydrogen halides

Solution:
"Drastic conditions" are used because the cleavage of ethers with hydrogen halides involves high temperatures and excess hydrogen halides.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the closest packing of atoms
Note: OV stands for Octahedral voids and TV stands for Tetrahedral voids.

Options:
A The size of TV is greater than that of OV
B The size of TV is smaller than that of OV
C The size of TV is equal to that of OV
D The size of TV may be greater or smaller or equal to that of OV depending upon the size of atoms

The correct answer is:
The size of TV is smaller than that of OV

Solution:
For a given radius of anion (r-)
Radius ratio for OV and TV is as follows
râr-OV>râr-TV
For TV,râr-=0.225-0.414 For OV,râr-=0.414-0.732
Hence, size of OV is larger than that of TV.

Topic: Chemistry, Solid State, NEET
In the closest packing of is N atoms. There are

Options:
A 'N' tetrahedral voids and '2N' octahedral voids
B '2N' tetrahedral voids and 'N' octahedral voids
C '2N' tetrahedral voids and '2N' octahedral voids
D 'N' tetrahedral voids and 'N' octahedral voids

The correct answer is:
'2N' tetrahedral voids and 'N' octahedral voids

Solution:
For N packing atoms, there will be 2N tetrahedral and N octahedral voids.

Topic: Chemistry, Solid State, NEET
In the coagulation of a negative sol, what is the order of flocculating power for the mentioned ions?

Options:
A Al3+ > Ba2+ > Na+
B Ba2+ > Na+ > Al3+
C Na+ > Ba2+ > Al3+
D Na+ > Al3+ > Ba2+

The correct answer is:
Al3+ > Ba2+ > Na+

Solution:
The paragraph provides the order of flocculating power for the coagulation of a negative sol as Al3+ > Ba2+ > Na+.

Topic: Chemistry, Surface Chemistry, NEET
In the coagulation of a positive sol, what is the order of flocculating power for the mentioned ions?

Options:
A [Fe(CN)6]4– > PO43– > SO42– > Cl–
B Cl– > SO42– > PO43– > [Fe(CN)6]4–
C PO43– > Cl– > SO42– > [Fe(CN)6]4–
D [Fe(CN)6]4– > SO42– > PO43– > Cl–

The correct answer is:
[Fe(CN)6]4– > PO43– > SO42– > Cl–

Solution:
The paragraph provides the order of flocculating power for the coagulation of a positive sol as [Fe(CN)6]4– > PO43– > SO42– > Cl–

Topic: Chemistry, Surface Chemistry, NEET
In the coagulation of a positive sol, which ion has the least flocculating power?

Options:
A [Fe(CN)6]4–
B PO43–
C SO42–
D Cl–

The correct answer is:
Cl–

Solution:
The paragraph provides the order of flocculating power for the coagulation of a positive sol as [Fe(CN)6]4– > PO43– > SO42– > Cl– has the least flocculating power..

Topic: Chemistry, Surface Chemistry, NEET
In the combination of the following gates the output Y can be written in terms of inputs A and B as

Options:
A A.B¯+A.B
B A+B¯
C A.B¯+A¯.B
D A.B¯

The correct answer is:
A.B¯+A¯.B

Solution:
Y=( A. B ¯ + A ¯ .B )

Topic: Physics, Semiconductors, NEET, NEET 2018
In the combustion of methane (CH4), how many moles of oxygen are required to produce one mole of carbon dioxide (CO2)?

Options:
A 1 mole of oxygen
B 2 moles of oxygen
C 3 moles of oxygen
D 4 moles of oxygen

The correct answer is:
2 moles of oxygen

Solution:
In the combustion of methane (CH4), two moles of oxygen (O2) are required to produce one mole of carbon dioxide (CO2).

Topic: Chemistry, Hydrocarbons, NEET
In the complex [Co(NH3)6][CdClx] the oxidation number of cobalt is +3. The value of x is

Options:
A 3
B 4
C 2
D 5

The correct answer is:
5

Solution:
Since oxidation number of cobalt is +3 and that of Cd is +2. Thus charge on [CdClx]3- should be -3. Hence x + 2 = -3
or x = 5.

Topic: Chemistry, Coordination Compounds, NEET
In the complex [Co(en)3]3+, what is the coordination number of the cobalt ion?

Options:
A 3
B 4
C 5
D 6

The correct answer is:
6

Solution:
The coordination number of Co in the complex[Co(en)3]3+ is 6 because it is bonded to three en (ethane-1,2-diamine) ligands, each contributing two donor atoms.

Topic: Chemistry, Coordination Compounds, NEET
In the compound given below

The correct order of acidity of the positions (X), (Y) and (Z) is

Options:
A X > Y > Z
B Y > X > Z
C Z > X > Y
D X > Z > Y

The correct answer is:
X > Y > Z

Solution:
Carboxylic acids are stronger acids than N+H3 , therefore, X is the strongest acid. Since –COOH has –I effect which decreases with distance, therefore, effect is more pronounced on Y than on Z. As a result, Y is more acidic than Z. therefore, correct order of acidity of the positions is
X > Y > Z

Topic: Chemistry, General Organic Chemistry, NEET
In the compound, , the C2-C3 bond is of the type:

Options:
A sp - sp2
B sp3 - sp3
C sp - sp3
D sp2 - sp3

The correct answer is:
sp2 - sp3

Solution:
According to the IUPAC conventions, a compound can be numbered as :
H 2 C 1 = C 2 H - C 3 H 2 - C 4 H 2 - C 5 â¡ C 6 - H
Here, C-2 is sp2 and C-3 sp3 hybridised

Topic: Chemistry, Hydrocarbons, NEET
In the compounds of oxygen, how many covalent bonds can be formed in practice?

Options:
A Rarely exceeds one
B Rarely exceeds two
C Rarely exceeds three
D Rarely exceeds four

The correct answer is:
Rarely exceeds two

Solution:
The paragraph mentions that in practice, oxygen rarely exceeds two covalent bonds in its compounds.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In the Contact Process, what conditions are favorable for maximum yield during the catalytic oxidation of SO2 with O2 to give SO3?

Options:
A High temperature and high pressure
B Low temperature and low pressure
C High temperature and low pressure
D Low temperature and high pressure

The correct answer is:
Low temperature and high pressure

Solution:
In the Contact Process, low temperature and high pressure are favorable conditions for maximum yield during the catalytic oxidation of SO2 with O2 to give SO3.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In the context of a conjugate acid-base pair, what is the relationship between the strength of a strong acid and its conjugate base?

Options:
A The strong acid has a strong conjugate base
B The strong acid has a weak conjugate base
C The weak acid has a strong conjugate base
D The weak acid has a weak conjugate base

The correct answer is:
The strong acid has a weak conjugate base

Solution:
In the context of a conjugate acid-base pair, a strong acid will have a weak conjugate base.

Topic: Chemistry, Ionic Equilibrium, NEET
In the context of a reaction with an exceedingly small K, what is the role of a catalyst?

Options:
A A catalyst has no effect on such reactions
B A catalyst can increase the rate significantly
C A catalyst can decrease the rate significantly
D A catalyst can change the equilibrium constant

The correct answer is:
A catalyst has no effect on such reactions

Solution:
If a reaction has an exceedingly small K, a catalyst would be of little help.

Topic: Chemistry, Chemical Equilibrium, NEET
In the context of Amniocentesis, which of the following statement is incorrect?

Options:
A It is usually done by the collection of the amniotic fluid surrounding the foetus.
B It is used for prenatal sex determination
C It can be used for detection of Down syndrome
D It can be used for detection of Cleft palate

The correct answer is:
It can be used for detection of Cleft palate

Solution:
Statutory ban on amniocentesis for sex-determination to legally check the increasing menace of female foeticides, massive child immunization, etc. In amniocentesis, some of the amniotic fluid of the developing foetus is taken to analyze the fetal cells and dissolved substances. This procedure is used to test for the presence of certain genetic disorders such as, down syndrome, hemophilia, sickle-cell anemia, etc., determine the survivability of the foetus.
Sometimes cleft lip or palate can occur separately without other components of a syndrome, especially due to folate deficiency and also increased maternal age. TIFA scan which is usually done around the 20th week of gestation can detect cleft lip and palate with good accuracy.

Topic: Biology, Reproductive Health, NEET, NEET 2016 (Phase 1)
In the context of Amniocentesis, which of the following statement is incorrect?

Options:
A It is usually done by the collection of the amniotic fluid surrounding the foetus.
B It is used for prenatal sex determination
C It can be used for detection of Down syndrome
D It can be used for detection of Cleft palate

The correct answer is:
It can be used for detection of Cleft palate

Solution:
Statutory ban on amniocentesis for sex-determination to legally check the increasing menace of female foeticides, massive child immunization, etc. In amniocentesis, some of the amniotic fluid of the developing foetus is taken to analyze the fetal cells and dissolved substances. This procedure is used to test for the presence of certain genetic disorders such as, down syndrome, hemophilia, sickle-cell anemia, etc., determine the survivability of the foetus.
Sometimes cleft lip or palate can occur separately without other components of a syndrome, especially due to folate deficiency and also increased maternal age. TIFA scan which is usually done around the 20th week of gestation can detect cleft lip and palate with good accuracy.

Topic: Biology, Reproductive Health, NEET
In the context of assigning configuration to monosaccharides, which carbon atom is considered?

Options:
A The highest asymmetric carbon atom
B The most oxidized carbon atom
C The lowest asymmetric carbon atom
D The carbon atom with the highest atomic number

The correct answer is:
The lowest asymmetric carbon atom

Solution:
For assigning the configuration of monosaccharides, it is the lowest asymmetric carbon atom that is considered.

Topic: Chemistry, Biomolecules, NEET
In the context of carbohydrates, what is the term for the carbon atom that is not part of the sugar ring structure but is attached to the ring oxygen?

Options:
A Chiral carbon
B Anomeric carbon
C Hemiacetal carbon
D Epimeric carbon

The correct answer is:
Hemiacetal carbon

Solution:
The carbon atom that is not part of the sugar ring structure but is attached to the ring oxygen is referred to as the hemiacetal carbon in carbohydrates.

Topic: Chemistry, Biomolecules, NEET
In the context of carbohydrates, which two anomeric forms are involved in mutarotation?

Options:
A Alpha and gamma
B Alpha and beta
C Beta and delta
D Alpha and epsilon

The correct answer is:
Alpha and beta

Solution:
Mutarotation in carbohydrates involves the conversion between the alpha (α) and beta (β) anomeric forms.

Topic: Chemistry, Biomolecules, NEET
In the context of chemical bonds, what is meant by the extent of overlapping?

Options:
A The number of electrons shared between atoms
B The distance between bonded atoms
C The size of the atomic orbitals involved
D The degree to which atomic orbitals overlap in space

The correct answer is:
The degree to which atomic orbitals overlap in space

Solution:
In the context of chemical bonds, the extent of overlapping refers to the degree to which atomic orbitals overlap in space.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
In the context of chemical reactions, what does "irreversible" mean?

Options:
A The reaction proceeds very slowly
B The reaction cannot be detected experimentally
C The reaction can only go in one direction
D The reaction reaches a dynamic equilibrium

The correct answer is:
The reaction can only go in one direction

Solution:
The term "irreversible" means that the reaction can only proceed in one direction and does not reach dynamic equilibrium.

Topic: Chemistry, Chemical Equilibrium, NEET
In the context of chemical reactions, what does the term "rate determining step" refer to?

Options:
A The step with the highest rate
B The first step in the reaction mechanism
C The step with the lowest rate
D The final step in the reaction mechanism

The correct answer is:
The step with the lowest rate

Solution:
In the context of chemical reactions, the rate determining step refers to the step with the lowest rate.

Topic: Chemistry, Chemical Kinetics, NEET
In the context of comparing the strengths of two acids involved in a dissociation equilibrium, what determines which one is the stronger acid?

Options:
A The concentration of the acid
B The concentration of the base
C The acid's tendency to donate a proton
D The base's tendency to accept a proton

The correct answer is:
The acid's tendency to donate a proton

Solution:
In comparing the strengths of two acids involved in a dissociation equilibrium, the stronger acid is determined by its tendency to donate a proton.

Topic: Chemistry, Ionic Equilibrium, NEET
In the context of conjugate acids and bases, what characterizes a conjugate base in relation to a conjugate acid?

Options:
A The conjugate base has one more proton.
B The conjugate base has one less proton.
C The conjugate base has the same number of protons.
D The conjugate base has a different charge.

The correct answer is:
The conjugate base has one less proton.

Solution:
In the context of conjugate acids and bases, a conjugate base is characterized as having one less proton than its conjugate acid.

Topic: Chemistry, Ionic Equilibrium, NEET
In the context of crystal structure, what can a motif be?

Options:
A A molecule, atom, or ion
B A repeating pattern
C A two-dimensional lattice
D A covalent bond

The correct answer is:
A molecule, atom, or ion

Solution:
In the context of crystal structure, a motif can be a molecule, atom, or ion, as mentioned in the paragraph.

Topic: Chemistry, Solid State, NEET
In the context of electric charges and fields, which of the following statements is true?

Options:
A If the total charge enclosed by a surface is zero, the electric field everywhere on the surface is necessarily zero.
B If the total charge enclosed by a surface is zero, the electric field everywhere on the surface can be non-zero.
C If the electric field everywhere on a surface is zero, the net charge inside the surface is necessarily zero.
D If the electric field everywhere on a surface is zero, the net charge inside the surface can be non-zero.

The correct answer is:
If the total charge enclosed by a surface is zero, the electric field everywhere on the surface can be non-zero.

Solution:
Correct Option is : (B)
If the total charge enclosed by a surface is zero, the electric field everywhere on the surface can be non-zero.

Topic: Chemistry, Electrostatics, NEET
In the context of entropy, what distinguishes between a reversible and irreversible process?

Options:
A ∆U (change in internal energy)
B ∆H (change in enthalpy)
C ∆S (change in entropy)
D ∆T (change in temperature)

The correct answer is:
∆S (change in entropy)

Solution:
The change in entropy (∆S) distinguishes between reversible and irreversible processes. For a reversible process, ∆S is zero, while for an irreversible process, ∆S is not zero.

Topic: Chemistry, Thermodynamics (C), NEET
In the context of ∆G, what does it mean for a reaction to have a positive enthalpy change and a positive entropy change?

Options:
A The reaction is spontaneous.
B The reaction is endothermic.
C The reaction is exothermic.
D The reaction can be spontaneous if T∆S is large enough to outweigh ∆H.

The correct answer is:
The reaction can be spontaneous if T∆S is large enough to outweigh ∆H.

Solution:
A reaction with a positive enthalpy change and a positive entropy change can be spontaneous if T∆S is large enough to outweigh ∆H.

Topic: Chemistry, Thermodynamics (C), NEET
In the context of genetics, what does a gene contain?

Options:
A Genetic material
B Enzymes
C Information to express a trait
D Chromosomes

The correct answer is:
Information to express a trait

Solution:
A gene contains the information to express a particular trait, which can be passed down from one generation to the next.

Topic: Biology, Principles of Inheritance and Variation, NEET
In the context of hydrogen's use as a fuel, what is the primary advantage of the Hydrogen Economy?

Options:
A Efficient electricity generation
B Storage and transportation of energy as dihydrogen
C Reduction of greenhouse gas emissions
D Direct use of hydrogen in automobiles

The correct answer is:
Storage and transportation of energy as dihydrogen

Solution:
The primary advantage of the Hydrogen Economy is the storage and transportation of energy in the form of liquid or gaseous dihydrogen, rather than as electric power.

Topic: Chemistry, Hydrogen, NEET
In the context of hyperconjugation, what happens to the σ electrons of a C—H bond?

Options:
A They become completely localized.
B They enter into partial conjugation with an unsaturated system or unshared p orbital.
C They become negatively charged.
D They are lost.

The correct answer is:
They enter into partial conjugation with an unsaturated system or unshared p orbital.

Solution:
In hyperconjugation, the σ electrons of a C—H bond enter into partial conjugation with an unsaturated system or an unshared p orbital.

Topic: Chemistry, General Organic Chemistry, NEET
In the context of ionic compounds, what is "lattice"?

Options:
A A network of covalent bonds
B A three-dimensional arrangement of ions
C The arrangement of valence electrons
D The arrangement of neutrons in the nucleus

The correct answer is:
A three-dimensional arrangement of ions

Solution:
In the context of ionic compounds, the "lattice" refers to a three-dimensional arrangement of ions.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
In the context of photoemission as depicted in Fig., how is momentum conservation reconciled, considering that light (photons) has momentum in a different direction from the emitted electrons?

Options:
A The momentum is conserved only in the macroscopic system, with no transfer to the metal at the microscopic level.
B Momentum is directly transferred to the emitted electrons, enabling their release from the metal surface.
C Conservation of momentum accounts for the transfer of momentum to both the nucleus and electrons, resulting in the emission of excited electrons.
D The momentum is primarily transferred to the surrounding environment, allowing the emitted electrons to gain sufficient energy for release.

The correct answer is:
Conservation of momentum accounts for the transfer of momentum to both the nucleus and electrons, resulting in the emission of excited electrons.

Solution:
Correct Option is : (C)
Conservation of momentum accounts for the transfer of momentum to both the nucleus and electrons, resulting in the emission of excited electrons.

Topic: Chemistry, Dual Nature of Matter, NEET
In the context of polaroids, when three polaroids (I, II, and III) are aligned as described, under what circumstances will light emerge from polaroid (II) if the pass axis of polaroid (III) is not parallel to either polaroid (I) or (II)?

Options:
A Light will always emerge from polaroid (II)
B No light will emerge from polaroid (II) under any circumstances
C Light will emerge from polaroid (II) only when the pass axis of (III) is perpendicular to (I) or (II)
D Light will emerge from polaroid (II) only when the pass axis of (III) is parallel to (I) or (II)

The correct answer is:
Light will emerge from polaroid (II) only when the pass axis of (III) is perpendicular to (I) or (II)

Solution:
Correct Option is : (C)
Light will emerge from polaroid (II) only when the pass axis of (III) is perpendicular to (I) or (II)

Topic: Chemistry, Wave Optics, NEET
In the context of pressure-volume work, what does the external pressure (pex) represent?

Options:
A The pressure of the gas inside the cylinder
B The pressure exerted by the piston
C The pressure of the surroundings
D The pressure of the system

The correct answer is:
The pressure of the surroundings

Solution:
In pressure-volume work, the external pressure (pex) represents the pressure of the surroundings that acts on the system.

Topic: Chemistry, Thermodynamics (C), NEET
In the context of solutions, what are binary solutions?

Options:
A Mixtures consisting of two components
B Mixtures with varying compositions
C Mixtures with multiple solvents
D Mixtures with non-uniform properties

The correct answer is:
Mixtures consisting of two components

Solution:
The paragraph specifies that binary solutions consist of two components.

Topic: Chemistry, Solutions, NEET
In the context of the second law of thermodynamics, what is the significance of an increase in entropy in an isolated system?

Options:
A It indicates a decrease in disorder.
B It indicates a decrease in energy.
C It indicates a decrease in temperature.
D It is the natural direction of spontaneous change.

The correct answer is:
It is the natural direction of spontaneous change.

Solution:
In the context of the second law of thermodynamics, an increase in entropy in an isolated system is the natural direction of spontaneous change.

Topic: Chemistry, Thermodynamics (C), NEET