datavorous/entrance-exam-dataset huggingface dataset:
The mean time period of second's pendulum is 2.00 s and mean absolute error in the time period is 0.05 s. To express maximum estimate of error, the time period should be written as

Options:
A 2.00Â±0.01Â s
B 2.00Â±0.025 s
C 2.00Â±0.05 s
D 2.00Â±0.10Â s

The correct answer is:
2.00Â±0.05 s

Solution:
Mean time period T=2.00 s and Mean absolute error =ÎT=0.05 s
To express maximum estimate of error, the time period should be written as 2.0Â±0.05 s

Topic: Physics, Experimental Physics, NEET
The measure of resources enough to support a maximum possible number of species, beyond which no further growth is possible is known as:

Options:
A Population growth
B Biotic potential
C Carrying capacity
D None of these

The correct answer is:
Carrying capacity

Solution:
In nature, a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible. This limit is called as nature’s carrying capacity (K) for that species in that habitat.

Topic: Biology, Organisms and Populations, NEET
The measured voltage of the cell, Pt(s) H 2 (1.0 atm) H + (aq)| Ag + (1.0 M) Ag(s) is 1.02 V at 25 o C . Given Ecello is 0.80 V , calculate the pH of the solution.

Options:
A 1.86
B 1.69
C 3.73
D 7.43

The correct answer is:
3.73

Solution:
E cell  =  E cell o − 0.059 n  log [H + ] 2 [Ag + ] 2
=  E cell o − 0.059 × 2 2 log H + Ag +
E cell o −0.059 × log H + 1
=  E cell o  + 0.059  (− log[H + ]) 1
=  E cell o  + 0.059 pH
So pH =  E cell − E cell o 0.059  =  1.02−0.80 0.059  = 3.73

Topic: Chemistry, Electrochemistry, NEET
The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $1 \times 10^{-18} \mathrm{~g} \mathrm{~cm} \mathrm{~s}^{-1}$. The uncertainty in electron velocity is, (mass of an electron is $9 \times 10^{-28} \mathrm{~g}$ )

Options:
A $1 \times 10^9 \mathrm{~cm} \mathrm{~s}^{-1}$
B $1 \times 10^6 \mathrm{~cm} \mathrm{~s}^{-1}$
C $1 \times 10^5 \mathrm{~cm} \mathrm{~s}^{-1}$
D $1 \times 10^{11} \mathrm{~cm} \mathrm{~s}^{-1}$

The correct answer is:
$1 \times 10^9 \mathrm{~cm} \mathrm{~s}^{-1}$

Solution:
Key Idea : $\Delta x \times \Delta p \geq \frac{h}{4 \pi}$
where, $\Delta p=$ uncertainty in momentum and $\Delta v=$ uncertainty in velocity
Here, $\Delta p=1 \times 10^{-18} \mathrm{~g} \mathrm{~cm} \mathrm{~s}^{-1}$
$\begin{aligned}
m & =9 \times 10^{-28} \mathrm{~g} \\
\Delta y & =\frac{\Delta p}{m}=\frac{1 \times 10^{-18}}{9 \times 10^{-28}} \\
& =1.1 \times 10^9 \\
& \approx 1.0 \times 10^9 \mathrm{~cm} \mathrm{~s}^{-1}
\end{aligned}$

Topic: Chemistry, Structure of Atom, NEET, NEET 2008 (Screening)
The mechanical measure of population control includes

Options:
A Condom only
B Diaphragm only
C IUD only
D All of the above

The correct answer is:
All of the above

Solution:
The mechanical measure of population control includes is condom (nirodh), diaphragm and cervical cap and intrauterine devices (IUDs).

Topic: Biology, Reproductive Health, NEET
The mechanical quantity, which has dimensions of reciprocal of mass $\left(\mathrm{M}^{-1}\right)$ is

Options:
A Torque
B Gravitational constant
C Angular momentum
D Coefficient of thermal conductivity

The correct answer is:
Gravitational constant

Solution:
We know that, $F=\frac{G M_1 M_2}{r^2}$
$\begin{aligned} & \Rightarrow \quad[G]=\frac{[F]\left[r^2\right]}{\left[M_1\right]\left[M_2\right]}=\frac{\left[\mathrm{MLT}^{-2}\right]\left[\mathrm{L}^2\right]}{[\mathrm{M}][\mathrm{M}]} \\ & \Rightarrow[G]=\left[\mathrm{M}^{-1} \mathrm{~L}^3 \mathrm{~T}^{-2}\right]\end{aligned}$
i.e., gravitational constant is mechanical quantity which has dimensions of reciprocal of mass $\left(\mathrm{M}^{-1}\right)$

Topic: Physics, Units and Dimensions, NEET, NEET 2023 (Manipur)
The mechanism of the reaction, 2NO(g)+2H2(g)âN2(g)+2H2O(g), is
Step 1: 2NOg+H2gâslowN2+H2O2
Step 2: H2O2+H2âfast2H2O
Select the correct statement

Options:
A rate =k[NO]2[H2]2
B rate =k[H2O2][H2]
C on doubling the concentration of H2 , keeping the concentration of NO constant, the rate will become double
D if the initial concentration of H2 and NO is C0 and after time 't' the concentration of N2 is x, then rate =k(C0-2x)x

The correct answer is:
on doubling the concentration of H2 , keeping the concentration of NO constant, the rate will become double

Solution:
As slowest step is the rate determining.
Rate =k[NO]2[H2]
So on doubling the concentration of H2 without changing the concentration of NO, the rate will become double.

Topic: Chemistry, Chemical Kinetics, NEET
The mechanism that causes a gene to move from one linkage group to another is called:

Options:
A Inversion
B Duplication
C Translocation
D Crossing-over

The correct answer is:
Translocation

Solution:
Translocation is a phenomenon of transfer of a gene segment between non-homologous chromosome, i.e., different linkage group.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2016 (Phase 2)
The mechanism universally accepted to describe the translocation of sugars from source to sink is called

Options:
A Translocation of food due to TP gradient and imbibition force
B Translocation of food due to turgor pressure (TP) gradient
C Translocation of food due to imbibition force
D None of the above

The correct answer is:
Translocation of food due to turgor pressure (TP) gradient

Solution:
Munch hypothesis is based on translocation of food due to turgor pressure (TP) gradient.

Topic: Biology, Transport in Plants, NEET
The mediastinum is a space

Options:
A on the right side of the left lung and on the left side of the right lung
B on the left side of the left lung and on the right side of the right lung
C on the left side of the left lung and on the left side of the right lung
D on the right side of the left lung and on the right side of the right lung

The correct answer is:
on the right side of the left lung and on the left side of the right lung

Solution:
The mediastinum is the space-bound by sternum anteriorly, thoracic vertebrae posteriorly, inferiorly by a diaphragm and laterally by the pleura of lungs. It is the space in the thoracic cavity between the lungs containing the heart.

Topic: Biology, Breathing and Exchange of Gases, NEET
The medical termination of pregnancy is legal up to _____ of pregnancy.

Options:
A 12 weeks
B 4 weeks
C 20 weeks
D 24 weeks

The correct answer is:
20 weeks

Solution:
Medical termination of Pregnancy also known as induced abortion has been legalized by the Government of India in 1971 under strict conditions. It is permitted in cases where pregnancy is the result of the failure of contraceptives or from rape. It is also allowed if the continuation of the pregnancy is harmful to the mother's health or is fatal to the mother or fetus. MTP is considered safe up to 12 weeks of pregnancy and becomes riskier during the second trimester hence, requires the opinion of two registered medical practitioners. MTP beyond 20 weeks is illegal.

Topic: Biology, Reproductive Health, NEET
The medulla contains centers which control respiration, cardiovascular reflexes, and gastric secretions are related to

Options:
A midbrain
B forebrain
C spinal chord
D hindbrain

The correct answer is:
hindbrain

Solution:
The hindbrain comprises pons, cerebellum, and medulla oblongata. Pons consists of fiber tracts that interconnect different regions of the brain. Cerebellum has a very convoluted surface in order to provide the additional space for many more neurons. The medulla of the brain is connected to the spinal cord. The medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions.

Topic: Biology, Neural Control and Coordination, NEET
The medullary interstitial fluid of a patient is highly concentrated than a normal person. As compared to a normal individual, the patient's urine will be

Options:
A concentrated.
B dilute.
C isotonic.
D Both (B) and (C)

The correct answer is:
concentrated.

Solution:
The concentration of urine depends on medullary interstitial fluid. If the medullary interstitium is concentrated the urine is also concentrated. The medullary interstitial fluid causes the counter current mechanism. this occurs between the vasa recta and loop of henle.

Topic: Biology, Excretory Products and their Elimination, NEET
The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point, when the pressure increases. This is because

Options:
A Ice is less dense water
B Pressure generates heat
C The bonds break under pressure
D Ice is not a true solid

The correct answer is:
Ice is less dense water

Solution:
Ice ⇌ water
As volume of water is less than that of ice so according to Le chatelier's principle high pressure is required for melting of ice and to make PV constant.

Topic: Chemistry, Chemical Equilibrium, NEET
The members of which of the following phyla are exclusively marine?

Options:
A Arthropoda
B Echinodermata
C Annelida
D Mollusca

The correct answer is:
Echinodermata

Solution:
Echinoderms are invertebrates with spiny skin, water vascular system and a simple nervous system. This phylum is majorly a marine group and found in all oceans. They are not found in freshwater or terrestrial surfaces. There are around 7000 species of this group which found exclusively in marine environments. The other three phyla habitat various ecologies such as freshwater, terrestrial environments and marine waters.

Topic: Biology, Animal Kingdom, NEET
The membrane sarcolemma is found over

Options:
A Heart
B Muscle fibre
C Nerve fibre
D Both (A) and (B)

The correct answer is:
Muscle fibre

Solution:
The membrane of the muscle cells is called sarcolemma. The striated muscle fibres are covered by a modified cell membrane called sarcolemma. The sarcolemma is an electrically charged membrane. Sarcolemma invaginates to form T-tubules, which open to outside of the fibre.

Topic: Biology, Locomotion and Movement, NEET
The membranous cover of the ovum at ovulation is

Options:
A Corona radiata
B Zonaradiata
C Zona pellucida
D Chorion

The correct answer is:
Corona radiata

Solution:
The membranous cover of the ovum at ovulation is corona radiata.

Topic: Biology, Human Reproduction, NEET
The metal extracted by electrolysis of its fused salt is

Options:
A Iron
B Lead
C Sodium
D Copper

The correct answer is:
Sodium

Solution:
Metal extracted by electrolysis of its fused salt is sodium → Highly reactive metal

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
The metal oxide which cannot be reduced to metal by carbon is:

Options:
A $\mathrm{Al}_2 \mathrm{O}_3$
B $\mathrm{PbO}$
C $\mathrm{ZnO}$
D $\mathrm{Fe}_2 \mathrm{O}_3$

The correct answer is:
$\mathrm{Al}_2 \mathrm{O}_3$

Solution:
Oxides of reactive metals like Aluminium can be reduced by the electrolytic method.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET, NEET 2013 (Karnataka)
The metamorphosis shown by cockroaches is

Options:
A complete with egg and adult stages.
B complete with egg, nymph and adult stages.
C incomplete with egg, nymph and adult stages.
D incomplete with egg and adult stages.

The correct answer is:
incomplete with egg, nymph and adult stages.

Solution:
Metamorphosis is of two types: complete and incomplete. Incomplete metamorphosis in insects is characterized by having an egg, which goes through several nymphal stages to form an adult. In each nymphal stage, a small version of the adult gets slightly bigger with age. This type of metamorphosis is a characteristic feature found in cockroaches.

Topic: Biology, Structural Organisation in Animals, NEET
The method in which recombinant DNA is directly injected into the nucleus of an animal cell using microneedle is known as

Options:
A Gene gun
B Microinjection
C Biolostics
D Direct DNA injection.

The correct answer is:
Microinjection

Solution:
In micro injection the DNA is directly injected into the nucleus of host cell by using a microneedle.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The method of breeding, in which superior males of one breed are mated with superior females of another breed is called

Options:
A Inbreeding
B Inter-specific hybridization
C Outcrossing
D Cross Breeding

The correct answer is:
Cross Breeding

Solution:
Types of Outbreeding
A. Out-crossing: Breeding between the unrelated animals, which may be of the same breed but having no common ancestors on either side of their pedigree for 4-6 generations.
B. Cross-breeding: Breeding of animals of different breeds of the same species.
C. Inter-specific hybridization: Breeding of animals of different species.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
The method of separating and purifying foreign gene products once the biosynthetic stage is completed is called ___

Options:
A Origin of replication
B Bioreactors
C Downstream processing
D None of the above

The correct answer is:
Downstream processing

Solution:
The method of separating and purifying foreign gene products once the biosynthetic stage is completed is called downstream processing

Topic: Biology, Biotechnology - Principles and Processes, NEET
The method of sterilization is

Options:
A Lippes Loop
B IUD
C Implants
D Tubectomy

The correct answer is:
Tubectomy

Solution:
The method of sterilization is tubectomy (female) or vasectomy (male). The Lippes loop and IUD are a type of mechanical barrier. Implants are a method of chemical contraception.

Topic: Biology, Reproductive Health, NEET
The method of zone refining of metals is based on the principle of

Options:
A greater mobility of the pure metal than that of the impurity
B higher melting point of the impurity than that of the pure metal
C greater noble character of the solid metal than that of the impurity
D greater solubility of the impurity in the molten state than in the solid

The correct answer is:
greater solubility of the impurity in the molten state than in the solid

Solution:
Elements which are used as semiconductors such as Si, Ge, Ga etc. are refined by this method, which is based on the difference in solubility of impurities in molten and solid state of the metal.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
The method of zone refining of metals is based on the principle of:

Options:
A greater mobility of the pure metal that than that of the impurity
B higher melting point of the impurity than that of the pure metal
C greater noble character of the solid metal than that of the impurity
D greater solubility of the impurity in the molten state than in the solid

The correct answer is:
greater solubility of the impurity in the molten state than in the solid

Solution:
The principle of zone refining is that the impurities in ore of metal are more soluble in the melted state when compared to the corresponding solid state of the impurities. In the zone refining process, the impurities are concentrated at one end of the block of metal so that the rest of the block is purified.
Related Theory
Zone refining process is very effective in the removal of impurities from semiconducting elements such as Germanium, Gallium, and Silicon. This process is also used in refining high-purity metals.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET, NEET 2003
The method used to remove the temporary hardness of water is:

Options:
A Calgon's method
B Clark's method
C Ion-exchange method
D Synthetic resins method

The correct answer is:
Clark's method

Solution:
Clark’s method is used to remove temporary hardness in water. Calgon’s method, ion-exchange method and synthetic resins method are used to remove permanent hardness in water.

Topic: Chemistry, Hydrogen, NEET, NEET 2019 (All India)
The metre bridge wire AB shown in the adjoining figure is 100 cm long when AD=30 cm, no deflection occurs in the galvanometer. The value of R is

Options:
A 6Â Î©
B 9Â Î©
C 14 Î©
D 15Â Î©

The correct answer is:
14 Î©

Solution:
Let Ï be the resistance per unit length of the metre bridge wire.
From the condition of balance of Wheatstone bridge.
PQ=RS
â 6R=30Ï100-30Ï=3070=37
â R=7Ã63
â R=14 Î©

Topic: Physics, Current Electricity, NEET
The microbe also known as 'brewer's yeast' is

Options:
A A rod shaped bacterium called Lactobacillus
B An eukaryotic fungi called as S. cerevisiae
C A spherical bacterium called Staphylococci
D A spherical bacterium called Streptococci

The correct answer is:
An eukaryotic fungi called as S. cerevisiae

Solution:
'Saccharomyces cerevisiae' is commonly known as brewer's yeast. It is used for bread making. It is also used for the production of beverages like whiskey, wine, brandy, and rum. It is used for fermenting fruit juices and malted cereals for making ethanol.

Topic: Biology, Microbes in Human Welfare, NEET
The microbe associated with root nodule formation is

Options:
A Trichoderma
B Rhizobium
C Azotobacter
D Monascus

The correct answer is:
Rhizobium

Solution:
Rhizobium are symbiotic bacteria. They form symbiotic association with the roots of leguminous plants leading to the formation of root nodules. They are responsible for fixing atmospheric nitrogen in the soil using their photosynthetic activity. This nitrogen is later used by the plant as a nutrient.

Topic: Biology, Microbes in Human Welfare, NEET
The microbe that produces root nodules on the roots of Alnus is

Options:
A Nitrobacter
B Rhizobium
C Nitrosomonas
D Frankia

The correct answer is:
Frankia

Solution:
Several types of symbiotic biological nitrogen fixing associations are known. The most prominent among them is the legume-bacteria relationship. Species of rod-shaped Rhizobium has such relationship with the roots of several legumes such as alfalfa, sweet clover, sweet pea, lentils, garden pea, broad bean, clover beans, etc. The most common association on roots is as nodules. These nodules are small outgrowths on the roots. The microbe, Frankia, also produces nitrogen-fixing nodules on the roots of nonleguminous plants (e.g., Alnus). Both Rhizobium and Frankia are freeliving in soil, but as symbionts, can fix atmospheric nitrogen.

Topic: Biology, Mineral Nutrition, NEET
The microbe used for the commercial production of ethanol is

Options:
A Clostridium butylicum, a bacterium
B Aspergillus niger, a fungus
C Lactobacillus, a bacterium
D Saccharomyces cerevisiae, a fungus

The correct answer is:
Saccharomyces cerevisiae, a fungus

Solution:
The microbe used for the commercial production of ethanol is Saccharomyces cerevisiae. It is a fungus. It is also known as 'yeast'. Clostridium butylicum, Aspergillus niger and Lactobacillus are acid producers, responsible for the production of butyric acid, citric acid and lactic acid, respectively.

Topic: Biology, Microbes in Human Welfare, NEET
The microbial source for citric acid is

Options:
A Aspergillus niger
B Acetobacter aceti
C Clostridium butylicum
D Lactobacillus acidophilus

The correct answer is:
Aspergillus niger

Solution:
Examples of acid-producing microbes are Aspergillus niger (a fungus) of citric acid, Acetobacter aceti (a bacterium) of acetic acid; Clostridium butylicum (a bacterium) of butyric acid and Lactobacillus (a bacterium) of lactic acid.

Topic: Biology, Microbes in Human Welfare, NEET
The microspore mother cells are

Options:
A Sporophyte
B Gametophyte
C Microsporocyte
D Megasporocyte

The correct answer is:
Microsporocyte

Solution:
The microspore mother cell (microsporocyte) is a diploid cell that divides meiotically to give rise to four haploid microspores, called sporophyll. In young anther lobe, meristematic tissue differentiates to form archesporial tissue at four corners in four lobes. This archesporial tissue divides to form sporogenous tissue and primary parietal layer. This primary parietal layer divides to form three layers endothecium, middle layer and tapetum of microsporangia.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The migration of positively charged colloidal particles under an electrical field, towards the cathode is called

Options:
A Cataphoresis
B Electrosmosis
C Sedimentation
D Electrodialysis

The correct answer is:
Cataphoresis

Solution:
If the experiment is set such that only the colloidal particles are allowed to move and not the dispersion media particles, it is known as cataphoresis or electrophoresis.

Topic: Chemistry, Surface Chemistry, NEET
The mineral ion that acts as an activator for both RuBisCo and PEPcase enzyme is

Options:
A Copper.
B Magnesium.
C Zinc.
D Molybdenum.

The correct answer is:
Magnesium.

Solution:
Mg2+ is an activator for both ribulose bisphosphate carboxylaseoxygenase and phosphoenol pyruvate carboxylase, both of which are critical enzymes in photosynthetic carbon fixation; Zn2+ is an activator of alcohol dehydrogenase and Mo of nitrogenase during nitrogen metabolism. Cu is associated with certain enzymes involved in redox reactions

Topic: Biology, Mineral Nutrition, NEET
The mineral perovskite has a structure that is the prototype of many ABX3 solids particularly oxides. The perovskite structure is cubic with A atoms surrounded by 12 X atoms and the B atoms surrounded by 6 X atoms. The sum of charges on the cations A and B must be +6; it can be achieved in several ways (A2+B4+ and A3+B3+ among them). Oxidation state of titanium in CaTiO3 (Perovskite) is

Options:
A +2
B +3
C +4
D +1

The correct answer is:
+4

Solution:
CaTiO3
+2+x-6=0
x=+4 .

Topic: Chemistry, Solid State, NEET
The mineral present in cell wall is

Options:
A K, Mg and Ca
B Na, K and Mg
C Ca, Fe and CO3
D Mn, Ca and Fe

The correct answer is:
Ca, Fe and CO3

Solution:
Cell wall is the outermost covering in the plant cell. The cell wall provides support to the cell. It is made up of

Matrix: Water (60%), hemicellulose (5-15%), pectic substances (2-8%), lipids (0.5-3%), proteins (1-2%).

Microfibrils: Cellulose (10-15%).

Other ingredients: Lignin, cutin, suberin, silica, minerals-calcium, iron and carbonate.

Topic: Biology, Cell - The Unit of Life, NEET
The minimum energy required for the emission of photoelectron from the surface of a metal is 4.95 Ã 10-19 J . Calculate the critical frequency of the photon required to eject the electron. h= 6.6 Ã10-34 J sec .

Options:
A 7.5 ×1014s-1
B 7.5 ×1013s-1
C 7.5 ×1016s-1
D 7.5 ×1019s-1

The correct answer is:
7.5 ×1014s-1

Solution:
Minimum energy required for the emission of photoelectrons =4.95 ×10-19J
Let the critical frequency or threshold frequency of the photon to eject the electron is v sec-1 .
We know, E = hυ or υ = Eh = 4.95×10-196.6×10-34 = 7.5 ×1014s-1

Topic: Chemistry, Structure of Atom, NEET
The minimum energy required to launch a satellite of mass $m$ from the surface of earth of mass $M$ and radius $R$ in a circular orbit at an altitude of $2 R$ from the surface of the earth is:

Options:
A $\frac{2 G m M}{3 R}$
B $\frac{G m M}{2 R}$
C $\frac{G m M}{3 R}$
D $\frac{5 G m M}{6 R}$

The correct answer is:
$\frac{5 G m M}{6 R}$

Solution:
Apply energy conservation,
$\begin{gathered}
U_i+K_i=U_f+K_f \\
\Rightarrow \quad-\frac{G M m}{R}+K_i=-\frac{G M m}{3 R}+\frac{1}{2} m v^2 \\
\Rightarrow \quad-\frac{G M m}{R}+K_i=-\frac{G M m}{3 R}+\frac{1}{2} \times m \times \frac{G M}{3 R} \\
\Rightarrow \quad K_i=-\frac{1}{6} \frac{G M m}{R}+\frac{G M m}{R} \\
K_i=\frac{5}{6} \frac{G M m}{R}
\end{gathered}$

Topic: Physics, Gravitation, NEET, NEET 2024
The minimum force required to move a body up an inclined plane is three times the minimum force required to prevent it from sliding down the plane. If the coefficient of friction between the body and the inclined plane is 1 2 3 , the angle of the inclined plane is

Options:
A 60°
B 45°
C 30°
D 15°

The correct answer is:
30°

Solution:
The minimum force required to move a body up a rough inclined plane
F⁡1=mgsinθ+μcosθ
The minimum force required to prevent the body from sliding down the rough inclined plane.
F2=mg  sinθ−μ mg cosθ
F1=3F2
mg(sinθ+μcosθ)=3mg(sin−μcosθ)
4μcosθ=2sinθ
tanθ=2μ=13
⇒θ=30°

Topic: Physics, Laws of Motion, NEET