datavorous/entrance-exam-dataset huggingface dataset:
Which of the following statement is incorrect about the heart of cockroach?

Options:
A Heart is present along the mid-dorsal line of thorax and abdomen
B It is 13-chambered
C It is neurogenic
D It is myogenic

The correct answer is:
It is myogenic

Solution:
Heart of cockroach: Heart is present in the mid-dorsal side of the body. The heart is attached to the body wall by 12 pairs of alary muscles. The heart is divided into 13 funnel-shaped chambers, of which 3 lie in the thorax and 10 in the abdomen. Each chamber has a pair of openings at the sides called ostia. The ostia are guarded by valves which allow the flow of blood from pericardial sinus in to the heart but not in the opposite direction. During circulation blood flow in to the heart through ostia. The heart chambers contract one after the other rapidly and it is due to contraction and relaxation of alary muscles. This pushes the blood into the anterior aorta i.e. the anterior-most heart chamber. From aorta, the blood passes in the head sinus and into other sinuses. All the chambers of heart are interconnected and their openings is guarded by valves to maintain unidirection flow of blood.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following statement is incorrect for hydrogen peroxide?

Options:
A It is stored in plastic bottles in dark.
B It acts as an oxidizing as well as a reducing agent.
C It is used as a bleaching agent.
D It has acidic as well as basic properties.

The correct answer is:
It has acidic as well as basic properties.

Solution:
H2O2⇋H++HO2- ; H2O2⇋2H++O22-
2NaOH+H2O2→Na2O2+2H2O

Topic: Chemistry, s Block Elements, JEE Main
Which of the following statement is incorrect for ligand-metal complex

Options:
A Larger the donor atom of the ligand, the more stable is the metal-ligand bond
B Highly charged ligand forms strong bond
C Larger the permanent dipole moment of ligand, the more stable is the bond
D Greater the ionization potential of central metal, the stronger is the bond

The correct answer is:
Highly charged ligand forms strong bond

Solution:
The charge does not decide the formation of bond but availability of lone pair decide the formation of Co-ordinate bond.

Topic: Chemistry, Coordination Compounds, JEE Main
Which of the following statement is incorrect regarding the equation
MeCHO+AgNH32++O¯H⟶MeCOO-+Ag

Options:
A The equivalent weight of MeCHO is 22 .
B Three moles of O¯H are required in the reaction.
C MeCHO acts as an oxidising agent.
D AgNH32+ gets reduced.

The correct answer is:
MeCHO acts as an oxidising agent.

Solution:
Oxidation :
CH3COO-+3O¯H→CH3COO-+2e-+2H2O

Reduction : AgNH32++e-⟶Ag+NH3×2

CH3CHO+2AgNH32++3O¯H⟶CH3OO¯+2H2O

Molecular mass M of CH3CHO=44 g mol-1

Equivalent weight Eω=Mn-factor=442=22 g mol-1

Since aldehyde is getting oxidised therefore, it is acting as reducing agent and not oxidising agent.

Topic: Chemistry, Redox Reactions, JEE Main
Which of the following statement is not correct :-

Options:
A In the transition elements the incoming e-occupy \( (\mathrm{n}-1) \mathrm{d} \) subshell in preference to np.
B Elements having atomic number \( 57 \) to \( 71 \) belong to same group
C Lanthanum is the first element of Lanthanoids
D Actinium violates the Aufbau's principle

The correct answer is:
Lanthanum is the first element of Lanthanoids

Solution:
1. In the transition elements the incoming electron occupy (n-1)d subshell in preference to np.

2. Elements having atomic number 57 to 71
belong to same group i.e IIIB group of sixth period. These are also known as Lanthanoids.

3. Cerium is the first element of Lanthanoids.

4. Actinium violates the Aufbau's principle since last electron enters in 6d instead of 5f.

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following statement is not correct?

Options:
A During rolling, the instantaneous speed of the point of contact is zero.
B During rolling, the instantaneous acceleration of the point of contact is zero.
C For perfect rolling motion, work done against friction is zero.
D \( A \) wheel moving down a perfectly frictionless inclined plane will slip but not roll on the plane.

The correct answer is:
During rolling, the instantaneous acceleration of the point of contact is zero.

Solution:
A rolling boy can be imagined to be rotating about an axis passing through the point of contact of the body with the ground. Hence, the instantaneous sped of the point of contact is zero. Thus, statement (a) is correct. As the body is rotating, its instantaneous acceleration is not zero. Hence, Statement (b) is incorrect. Once perfect the rolling begins, force of friction becomes zero. Hence, work done against friction is zero. Thus, statement (c) is correct.
Rolling cannot take place in the absence of friction because it is the frictional force that provides the necessary torque which makes the body roll on a surface. When the inclined plane is perfectly smooth, the wheel will simply slip under the effect of its weight. Hence, statement (d) is correct.

Topic: Physics, Rotational Motion, JEE Main
Which of the following statement is NOT correct?

Options:
A
Ground wave signals are more stable than the sky wave signals.

B
The critical frequency of an ionospheric layer is the highest frequency that will be reflected back by the layer when it is vertically incident.

C
Electromagnetic waves of frequencies higher than about $30 \mathrm{MHz}$ cannot penetrate the ionosphere.

D
Sky wave signals in the broadcast frequency range are stronger at night than in the day time.

The correct answer is:
Electromagnetic waves of frequencies higher than about $30 \mathrm{MHz}$ cannot penetrate the ionosphere.

Solution:
Above critical frequency $\left(f_c\right)$, an electromagnetic wave penetrates the ionosphere and is not reflected by it.

Topic: Physics, Communication System, JEE Main, JEE Main 2013 (23 Apr Online)
Which of the following statement is not correct?

Options:
A
Amylopectin is a branched polymer of $\alpha$ - glucose.

B
Cellulose is a linear polymer of $\beta$-glucose.

C
Glycogen is the food reserve of plants.

D
All proteins are polymers of $\alpha$ - amino acids.

The correct answer is:
Glycogen is the food reserve of plants.

Solution:
Glycogen is called animal starch and is found in all animal cells. It constitutes the reserve food material.

Topic: Chemistry, Polymers, JEE Main, JEE Main 2013 (25 Apr Online)
Which of the following statement is not correct?

Options:
A Rhizome is a condensed form of stem
B The apical bud in rhizome always remains above the ground
C The rhizome is aerial with no distinct nodes and internodes
D The rhizome is thick, prostrate and branched

The correct answer is:
The rhizome is aerial with no distinct nodes and internodes

Solution:
The Rhizome is underground stem modification in which nodes and internodes are distinct. The nodes contain several buds from which new plants arise. It is prostate and branched. e.g. Sugarcane, Banana, etc.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2022 (Phase 2)
Which of the following statement is NOT correct about solution?

Options:
A The three states of matter solid, liquid and gas may play the role of either solute or solvent.
B The component of solution which constitute smaller part is called solute.
C When water is solvent, the process of solvation is known as hydration.
D True solution is a heterogenous mixture of two or more substances with fixed composition.

The correct answer is:
True solution is a heterogenous mixture of two or more substances with fixed composition.

Solution:
A true solution is a homogeneous mixture with consistent properties. Filtration cannot separate the solute from the solution in a true solution. The solute's particle size is around the same as the solvent's, and the solvent and solute move through the filter paper together.
A true solution is a homogeneous mixture of two or more substances in which the particle size of the material dissolved (solute) in the solvent is less than $10-9 \mathrm{~m}$ or $1 \mathrm{~nm}$. True solution is exemplified by a simple sugar solution in water.

Topic: Chemistry, Solutions, JEE Main
Which of the following statement is not correct in the case of light emitting diodes?

A. It is a heavily doped p-n junction.

B. It emits light only when it is forward biased.

C. It emits light only when it is reverse biased.

D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.

Choose the correct answer from the options given below :

Options:
A C and D
B A
C C
D B

The correct answer is:
C

Solution:
The structure of the LED has a high level of doping so that it can work on the principle of the interconversion of the light and electricity. It is in forward biased so that it can emit light spontaneously when connected as it reduces the efficiency of energy barrier. It will not emit light in reverse biased condition.

The energy of radiation emitted by LED is not greater than the band gap of the semiconductor used.

Topic: Physics, Semiconductors, JEE Main, JEE Main 2023 (29 Jan Shift 1)
Which of the following statement is not correct regarding hydrogen atom

Options:
A It resembles halogens in some properties
B It resembles alkali metals in some properties
C It can be placed in 7th group of periodic table
D It can not be placed in first group of periodic table

The correct answer is:
It can not be placed in first group of periodic table

Solution:
Hydrogen resembles alkali metals in some properties so it can be placed in the first group of periodic table.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of the following statement is not true about Mohr's salt

Options:
A It decolourises $\mathrm{KMnO}_4$
B It is a primary standard
C It is a double salt
D Oxidation state of iron is +3 in this salt

The correct answer is:
Oxidation state of iron is +3 in this salt

Solution:
Oxidation state of iron in mohr's salt $\mathrm{FeSO}_4\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}$ is + 2 .

Topic: Chemistry, d and f Block Elements, JEE Main
Which of the following statement is not true about stopping potential $\left(\mathrm{V}_0\right)$ ?

Options:
A It is $1 /$ e times the maximum kinetic energy of electrons emitted.
B It increases with increase in intensity of the incident light.
C It depends on the nature of emitter material.
D It depends upon frequency of the incident light.

The correct answer is:
It increases with increase in intensity of the incident light.

Solution:
$\mathrm{KE}_{\max }=\mathrm{h} \nu-\phi_0=\mathrm{eV}$

Topic: Physics, Dual Nature of Matter, JEE Main, JEE Main 2024 (05 Apr Shift 2)
Which of the following statement is not true for glucose?

Options:
A Glucose exists in two crystalline forms α and β
B Glucose gives Schiff’s test for aldehyde
C Glucose reacts with hydroxylamine to form oxime
D The pentaacetate of glucose does not react with hydroxylamine to give oxime

The correct answer is:
Glucose gives Schiff’s test for aldehyde

Solution:
Open chain form of glucose is very very small, hence does not gives Schiff's test.

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2020 (08 Jan Shift 1)
Which of the following statement is not true?

Options:
A In plant outer layer in cell is cell wall and in animal cell membrane
B Dence membrane bound nucleus and semifluid matrix cytoplasm is present in eukaryote cell only
C Cytoplasm is the main area of cellular activities in plant and animal cells
D All are true

The correct answer is:
Dence membrane bound nucleus and semifluid matrix cytoplasm is present in eukaryote cell only

Solution:
Dense membrane bound nucleus in eukaryote cells only, semifluid matrix, cytoplasm is present in eukaryotic and prokaryotic both cells.

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

Options:
A SbF4- and SF4 are isostructural
B In IOF5 the hybridization of central atom is sp3d2
C Double bond(s) in SOF4 and XeO3F2 , is/are occupying equatorial position(s) of their
D All of these

The correct answer is:
All of these

Solution:
A. Both SbF4- and SF4 have sea-saw structure
B. IOF3 has sp3d2 hybridisation
C. Both SOF4 and XeO3F2 have trigonal bipyramidal structure where double bond is present at equatorial position.

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main
Which of the following statement is true?

Options:
A Absolute zero degree temperature is not zero energy temperature.
B Two different gases at the same temperature pressure have equal root mean square velocities.
C The rms speed of the molecules of different ideal gases, maintained at the same temperature are the same.
D Given sample of \( 1 \) cc of hydrogen and \( 1 \) cc of oxygen both at NTP, oxygen sample has a large number of molecules.

The correct answer is:
Absolute zero degree temperature is not zero energy temperature.

Solution:
From the law of equipartition of energy law, the total kinetic energy of the gas is KE=f2nRT, which is proportional to the temperature.

At absolute zero temperature, kinetic energy of the gas molecules becomes zero, but they may possess some potential energy, so we cannot say that absolute zero degree temperature is zero energy temperature.

The RMS speed of a gas is given by vRMS=3RTM.

For different gases or at different temperature, it will be different. But it does not depend on the pressure.

From the ideal gas equation, PV=nRT, two different gases at same temperature, pressure and volume will have the same number of moles and same number of molecules.

Topic: Physics, Kinetic Theory of Gases, JEE Main
Which of the following statement is true

Options:
A Absolute zero degree temperature is not zero energy temperature
B Two different gases at the same temperature pressure have equal root mean square velocities
C The root mean square speed of the molecules of different ideal gases, maintained at the same temperature are the same
D Given sample of $1 \mathrm{cc}$ of hydrogen and $1 \mathrm{cc}$ of oxygen both at NTP; oxygen sample has a large number of molecules

The correct answer is:
Absolute zero degree temperature is not zero energy temperature

Solution:
Absolute zero degree temperature is not zero energy temperature

Topic: Physics, Kinetic Theory of Gases, JEE Main
Which of the following statement is true for lymph?

Options:
A WBC and serum
B All components of blood except RBCs and some proteins
C RBCs, WBCs and plasma
D RBCs. proteins and platelets

The correct answer is:
All components of blood except RBCs and some proteins

Solution:
Lymph is a clear-to-white fluid made of white blood cells, especially lymphocytes, and serum. Serum is plasma minus clotting factor.
Related THeory:-
Serum, the portion of plasma remaining after coagulation of blood, during which process the plasma protein fibrinogen is converted to fibrin and remains behind in the clot.

Topic: Biology, Body Fluids and Circulation, NEET, NEET 2002
Which of the following statement is true for the electrochemical Daniel cell

Options:
A Electrons flow from copper electrode to zinc electrode
B Current flows from zinc electrode to copper electrode
C Cations move toward copper electrode which is cathode
D Cations move toward zinc electrode

The correct answer is:
Cations move toward copper electrode which is cathode

Solution:
In daniel cell copper rod acts as cathode so there cations move towards copper electrode and reduction take place on copper rod.

Topic: Chemistry, Electrochemistry, JEE Main
Which of the following statement is true The entropy of the universe

Options:
A Increases and tends towards maximum value
B Decreases and tends to be zero
C Remains constant
D Decreases and increases with a periodic rate

The correct answer is:
Increases and tends towards maximum value

Solution:
Increases and tends towards maximum value

Topic: Chemistry, Thermodynamics (C), JEE Main
Which of the following statement is wrong?

Options:
A The two sulphur atoms in the thiosulphate ions occupy equivalent positions
B Ice results from cooling of water whereas snow results from cooling of vapours to solid
C Formation of ice is solidification whereas formation of snow is Hoar frost
D Ice sublimes on moon

The correct answer is:
The two sulphur atoms in the thiosulphate ions occupy equivalent positions

Solution:
1635S+SO32-→[1635SSO3]2-→2H+1635S+H2O+SO2
The tagging technique confirms that two S atoms in S2O32- ions do not occupy equivalent positions.
Also, water→ Solidification ice
ice→ sublimation vapour→ Hoarfrost ice
ice→vapour
Ice sublimes on moon and directly convert into water vapour.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Which of the following statement is wrong?

Options:
A Pollen grain in some plants remains viable for months.
B Tapetum nourishes the developing pollen.
C Vegetative cell is larger than generative cell.
D PEN is produced by the fusion of two polar nuclei.

The correct answer is:
PEN is produced by the fusion of two polar nuclei.

Solution:
PEN is the primary endosperm nucleus which is formed by triple fusion when second male gamete fuses with polar nuclei present in the central cell to form triploid primary endosperm nucleus which divides to form triploid endosperm.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Which of the following statement is wrong?

Options:
A
Nitrogen cannot form $d \pi-p \pi$ bond.

B
Single $\mathrm{N}-\mathrm{N}$ bond is weaker than the single $\mathrm{P}-\mathrm{P}$ bond,

C
$\mathrm{N}_2 \mathrm{O}_4$ has two resonance structures

D
The stability of hydrides increases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ in group 15 of the periodic table

The correct answer is:
The stability of hydrides increases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ in group 15 of the periodic table

Solution:
Stability of hydrides decreases down the group from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ as $\mathrm{M}-\mathrm{H}$ bond energy decreases.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main, JEE Main 2011
Which of the following statement is wrong?

Options:
A
Nitrogen cannot form $d \pi-p \pi$ bond.

B
Single $\mathrm{N}-\mathrm{N}$ bond is weaker than the single $\mathrm{P}-\mathrm{P}$ bond,

C
$\mathrm{N}_2 \mathrm{O}_4$ has two resonance structures

D
The stability of hydrides increases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ in group 15 of the periodic table

The correct answer is:
The stability of hydrides increases from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ in group 15 of the periodic table

Solution:
Stability of hydrides decreases down the group from $\mathrm{NH}_3$ to $\mathrm{BiH}_3$ as $\mathrm{M}-\mathrm{H}$ bond energy decreases.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Which of the following statement is wrong regarding lanthanoids?

Options:
A Ln(III) compounds are generallycolourless.
B Ln(III) compounds are predominantly ionicin character.
C The ionic size of \( \operatorname{Ln}( \) III \( ) \) ions decreaseswith increasing atomic number.
D \( \operatorname{Ln}( \) III \( ) \) hydroxides are mainly basic in nature

The correct answer is:
Ln(III) compounds are generallycolourless.

Solution:
Ln(III) ions are colored due to the presence of partly filled orbitals as a result it is possible to absorb certain
wavelengthfrom the visible region of the spectrum. Therefore, \( \operatorname{Ln}(I \mid I) \) compounds are generally colorless is a wrong
statement regarding lanthanoids.

Topic: Chemistry, Structure of Atom, KCET, KCET 2017
Which of the following statement is wrong

Options:
A RuCl62- has a t2g4 configuration
B Fe Ox 3 3− is a low spin complex
C Pairing energy of 4d and 5d series metal tend to be lower than the 3d series metals.
D Number of unpaired electrons in MnCN63- is 2

The correct answer is:
Fe Ox 3 3− is a low spin complex

Solution:
Fe Ox 3 3− is a high spin complex.

Topic: Chemistry, Coordination Compounds, JEE Main
Which of the following statement is/are correct?
I. The ligand thiosuphato, S2O32- can give rise to linkage isomers.
II. In metallic carbonyls the ligand CO molecule acts both as donor and acceptor.
III. The complex PtPyNH3NO2ClBrI exists in eight different geometrical isomeric forms
IV. The complex ferricyanide ion does not follow effective atomic number (EAN) rule.

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

The correct answer is:
I, II and IV

Solution:
S2O32- can give rise to linkage isomers as it can coordinate through both O and S atoms. Ligand CO molecule acts both as donor and acceptor by donating pi electron and accepting electron form metal into its vacant π* molecular orbital. Hence here I and II are correct and in case of ferricyanide ion effective atomic number is 35 so IV is also correct.

Topic: Chemistry, Coordination Compounds, JEE Main
Which of the following statement regarding cymose inflorescence is incorrect?

Options:
A The members of genus Solanum show solitary or cymose inflorescence.
B The arrangement of flowers shows basipetal arrangement.
C The main axis of inflorescence terminates into a flower.
D The older flowers are borne at the base and the younger ones at the apex.

The correct answer is:
The older flowers are borne at the base and the younger ones at the apex.

Solution:
In cymose inflorescence, the younger flowers are at the base (lateral axis) and the old one is at the apex. This is called basipetal succession. In this, the main axis terminates in a flower and hence has limited growth.

Topic: Biology, Morphology of Flowering Plants, NEET
Which of the following statement related to hysteresis loop is incorrect?

Options:
A The curve of $\mathrm{B}$ against $\mathrm{H}$ for $\mathrm{a}$ ferromagnetic material is called hysteresis loop
B The area of $B$ - $H$ curve is a measure of power dissipated per cycle per unit area of the specimen
C Coercitivity is a measure of the magnetic field required to destroy the residual magnetism of ferromagnetic material
D The retentivity of a specimen is the measure of magnetic field remaining in the specimen when the magnetising field is removed

The correct answer is:
The area of $B$ - $H$ curve is a measure of power dissipated per cycle per unit area of the specimen

Solution:
The hysteresis loop i.e. area of B-H curve is a measure of energy dissipated per cycle per unit volume of the specimen. It depends on the nature of magnetic material.

Topic: Physics, Magnetic Properties of Matter, VITEEE, VITEEE 2015
Which of the following statement related to the hysteresis loop is incorrect?

Options:
A The curve of B against H for a ferromagnetic material is called hysteresis loop
B The area of B-H curve is a measure of power dissipated per cycle per unit, area of the specimen
C Coercitivity is a measure of the magnetic field required to destory the residual magnetism of ferromagnetic material
D The retentivity of a speciment is the measure of magnetic field remaining in the speciment when the magnetising field is removed

The correct answer is:
The area of B-H curve is a measure of power dissipated per cycle per unit, area of the specimen

Solution:
The hysteresis loop i.e. are of B-H curve is a measure of energy dissipiated per cycle per unit volume of the specimen. It depends on the nature of magnetic material.

Topic: Physics, Magnetic Properties of Matter, NEET
Which of the following statements about air pressure in a car tire during driving is true?

Options:
A Air pressure decreases
B Air pressure remains constant
C Air pressure increases
D Air pressure fluctuates

The correct answer is:
Air pressure increases

Solution:
Correct Option is : (C)
Air pressure increases

Topic: Chemistry, Thermodynamics, NEET
Which of the following statements about aspirin is not true?

Options:
A
It is effective in relieving pain.

B
It is a neurologically active drug.

C
It has antiblood clotting action.

D
It belongs to narcotic analgesics.

The correct answer is:
It belongs to narcotic analgesics.

Solution:
Aspirin is a non-narcotics analgesic.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main, JEE Main 2013 (22 Apr Online)