datavorous/entrance-exam-dataset huggingface dataset:
Thirteen resistances each of resistance R ohm are connected in the circuit as shown in the figure below. The effective resistance between A and B is

Options:
A R Ω
B 2R3 Î©
C 4R3 Ω
D 2R Ω

The correct answer is:
2R3 Î©

Solution:
Equivalent circuit will be
Now above circuit is a wheat stone's bridge.
By solving we get.
RAB=43R×43R43R+43R=23R

Topic: Physics, Current Electricity, NEET
This bird has become recently extinct from

Options:
A India
B Mauritius
C Australia
D Maldives

The correct answer is:
Mauritius

Solution:
Biodiversity includes all the flora and fauna on Earth. All the varieties of organisms come under biodiversity. Ecologist say that without any doubt there is decline in the biological wealth which is more rapid due to the activities of us humans. When a group of organisms or its type is completely terminated from Earth is said to be extinct. Study has shown that since the origin and diversification, Earth has faced 5 massive extinctions and we are heading towards the sixth one.
Raphus cucullatus, commonly called Dodo, is a flightless bird that is extinct. The bird was endemic to the island of Mauritius in the Indian Ocean. This bird got extinct due to extreme hunting by humans and predation.

Topic: Biology, Biodiversity and its Conservation, NEET
This diagramatic view represent which phylum.

Options:
A Porifera
B Cnidaria
C Ctenophora
D Platyhelminthes

The correct answer is:
Cnidaria

Solution:
This diagram represent to phylum Cnidaria . The namae cnidaria derives from cnidoblasts or cnidocytes .

Topic: Biology, Animal Kingdom, NEET
This entry in the table is wrongly matched, identify.

(a)	Monascus purpureus	Statins	Lowers blood cholesterol

(b)	Streptococcus	Streptokinase	Removes clots from blood vessels

(c)	Clostridium acetobutylicum	Lipase	Oil stain removal

(d)	Trichoderma polysporum	Cyclosporin-A	Immunosuppressive drug

Options:
A a
B b
C c
D d

The correct answer is:
c

Solution:
Clostridium acetobutylicum is a Gram-positive rod-shaped bacteria and is a soil-dwelling organism. This mesophilic organism is saccharolytic and capable of producing a number of different commercially useful products; most notably acetone, ethanol and butanol.

Candida lipolytica is a fungus that is commonly used in detergents to remove oil stains from the laundry, as it produces a high quantity of lipases.

Topic: Biology, Microbes in Human Welfare, NEET
This entry in the table is wrongly matched, identify.

Options:
A

Microbes	Product	Action

Monascus purpureus	Statins	Lowers blood cholesterol

B

Microbes	Product	Action

Streptococcus	Streptokinase	Removes clots from blood vessels

C

Microbes	Product	Action

Clostridium acetobutylicum	Lipase	Oil stain removal

D

Microbes	Product	Action

Trichoderma polysporum	Cyclosporin-A	Immunosuppressive drug

The correct answer is:

Microbes	Product	Action

Clostridium acetobutylicum	Lipase	Oil stain removal

Solution:
Clostridium acetobutylicum is a Gram-positive rod-shaped bacteria and is a soil-dwelling organism. This mesophilic organism is saccharolytic and capable of producing a number of different commercially useful products; most notably acetone, ethanol and butanol.

Candida lipolytica is a fungus that is commonly used in detergents to remove oil stains from the laundry, as it produces a high quantity of lipases.

Topic: Biology, Microbes in Human Welfare, NEET, NEET 2019 (All India)
This graph indicates:

Options:
A Stabilizing selection
B Directional selection
C Disruptive selection
D Industrial melanism

The correct answer is:
Stabilizing selection

Solution:
Stabilizing selection is a type of natural selection that favors the average individuals in a population. This process selects against the extreme phenotypes and instead favors the majority of the population that is well adapted to the environment. Stabilizing selection is often shown on a graph as a modified bell curve that is narrower and taller than the norm.

Topic: Biology, Evolution, NEET
This graphical representation specifies

Options:
A Absorption spectrum
B Action spectrum
C both a and b
D neither a nor b

The correct answer is:
Action spectrum

Solution:
The curve representing the rate of photosynthesis at various wavelengths by various photosynthetic pigments is called action spectrum. According to action spectrum, the highest rate of photosynthesis in green plants is in red and blue region of spectrum. The action spectrum shows the highest peak in red region and another smaller peak in blue region.

Topic: Biology, Photosynthesis in Higher Plants, NEET
This segment of DNA has restriction sites I and II which create restriction fragments a, b, and c. Which of the following gels produced by electrophoresis would represent the separation and identity of these fragments?

Options:
A
B
C
D

The correct answer is:

Solution:
In Gel Electrophoresis Nucleic acid molecules are separated by applying an electric field to move the negatively charged molecules through a matrix of agarose or other substances. Shorter molecules move faster and migrate farther than longer ones because shorter molecules migrate more easily through the pores of the gel. This phenomenon is called sieving.
hence c been the longest fragment travel short distance.
a and b are short fragment and nearly equal in size ove farther down.

Topic: Biology, Biotechnology - Principles and Processes, NEET
This time period of a particle undergoing SHM is 16 s. It starts motion from the mean position. After 2 s, its velocity is 0.4 m s-1. The amplitude is

Options:
A 1.44 m

B 0.72 m

C 2.88 m

D 0.36 m

The correct answer is:
1.44 m

Solution:
Velocity, v=rÏcosâ¡Ït;
0.4=rÃ2Ï16cosâ¡2Ï16Ã2=rÃ2Ï16Ã12
or r=0.4Ã16Ã22Ï=3.22Ï=1.44 m

Topic: Physics, Oscillations, NEET
Tho population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

Options:
A the food plants mature and die at the end of the rainy season
B its population growth curve is of J-type
C the population of its predators increases enormously
D S-shaped or sigmoid growth of this insect.

The correct answer is:
its population growth curve is of J-type

Solution:
If a population (e.g., reindeer population) is allowed to grow in a predator free environment, the population grows beyond carrying capacity and there occurs population crash due to sudden shortage of food. Such growth curves also occur ininsect populations during rainy season, and in Algal blooms. The exponential growth stops abruptly as the environmental resistance or another limiting factor becomes effective.

Topic: Biology, Organisms and Populations, NEET, NEET 2007
Thorium general oxidation state is:

Options:
A 3
B 4
C 5
D 6

The correct answer is:
4

Solution:
Correct Option is : 2
4

Topic: Chemistry, d and f Block Elements, NEET
Thorn is a stem structure because it

Options:
A develops from trunk
B develops from axillary bud
C grows from external surface
D is pointed

The correct answer is:
develops from axillary bud

Solution:
Thorn is the axillary buds of some plants. They get arrested in growth and gets modified into a stiff, sharp, pointed structures. They are deep-seated structures and have vascular connections with the stem. They reduce transpiration (water loss by reducing the surface area) and they protect the plant from grazing animals also.

Topic: Biology, Morphology of Flowering Plants, NEET
Thorn of Bougainvillea and tendril of Cucurbita are examples of

Options:
A analogous organs
B homologous organs
C vestigial organs
D retrogressive evolution

The correct answer is:
homologous organs

Solution:
Thorns of Bougainvillea and tendrils of Cucurbita are homologous organs. These are modified branches and are axillary in position. It means axillary branches in Bougainvillea are modified into thorns for protection from burrowing animals and in cucurbita into tendrils for climbing.
The analogous organs have almost similar appearance and perform the same function but these develop in totally different groups and are totally different in their basic structure and developmental origin. The phyllode of Ruscus or cladode of Asparagus are analogous to leaves of other plants.
The vestigial or rudimentary organs are useless remnants of structures or organs, which might have been large and functional in ancestors, eg, cutin covered stomata on the stem of cacti plants.

Topic: Biology, Evolution, NEET, NEET 2008 (Screening)
Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why?

Options:
A Alcoholic potassium permanganate has a higher reactivity than the other forms.
B Alcoholic potassium permanganate is more stable than the other forms.
C Alcoholic potassium permanganate can selectively oxidize toluene to benzoic acid.
D Alcoholic potassium permanganate is less expensive than the other forms.

The correct answer is:
Alcoholic potassium permanganate can selectively oxidize toluene to benzoic acid.

Solution:
Correct Option is : (C)
Alcoholic potassium permanganate can selectively oxidize toluene to benzoic acid.

Topic: Chemistry, Redox Reactions, NEET
Though all persons are vulnerable to STDs, their incidences are reported to be very high among

Options:
A the age group of 24-30 years.
B person having sex with single partner.
C persons using injectable drugs frequently.
D More than one option is correct.

The correct answer is:
persons using injectable drugs frequently.

Solution:
Diseases that spread through sexual intercourse are termed as Sexually transmitted diseases (STD's) or Venereal diseases. Hepatitis, HIV and Herpes are non curable STD's. All individuals are vulnerable for such conditions but it is common in age group of 15-24 years. These are seen in people with multiple sex partners and in those that use drugs through injections.

Topic: Biology, Reproductive Health, NEET
Though nitrogen exhibits a +5 oxidation state, it does not form pentahalide. Give reason.

Options:
A Nitrogen lacks the necessary electrons for pentahalide formation.
B Nitrogen's electron configuration does not allow for the formation of pentahalides.
C Nitrogen is too stable in its +4 oxidation state to form pentahalides.
D Nitrogen's electronegativity prevents the formation of pentahalides.

The correct answer is:
Nitrogen's electron configuration does not allow for the formation of pentahalides.

Solution:
Correct Option is : (B)
Nitrogen's electron configuration does not allow for the formation of pentahalides.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Three amplifiers X, Y, and Z are connected in series. If the voltage gains of X, Y, and Z are 10, 20, and 30, respectively, and the input signal is 1 mV peak value, what will be the output signal voltage (peak value) if the DC supply voltage is 10V?

Options:
A 5V
B 6V
C 7V
D 8V

The correct answer is:
6V

Solution:
Correct Option is : (B)
6V

Topic: Chemistry, Semiconductors, NEET
Three balls are dropped from the top of a building with equal speeds but at different angles. Balls strike the ground with velocities v1, v2 and v3 respectively, then

Options:
A v1>v2>v3
B v3>v2>v1
C v1=v2=v3
D v2<v3<v1

The correct answer is:
v1=v2=v3

Solution:
All the balls are projected from the same height, and velocity is independent of Î¸ therefore their velocities will be equal.
Hence, v1=v2=v3

Topic: Physics, Motion In Two Dimensions, NEET
Three balls are projected from the top of a building with equal speeds but at different angles. Balls strike the ground with velocities v1, v2 and v3 respectively, then

Options:
A v1>v2>v3
B v3>v2>v1
C v1=v2=v3
D v2<v3<v1

The correct answer is:
v1=v2=v3

Solution:
All the balls are projected from the same height, and velocity is independent of Î¸ therefore their velocities will be equal.
Hence, v1=v2=v3

Topic: Physics, Motion In Two Dimensions, NEET
Three biodiversity hotspots of India are

Options:
A the Himalayas and the Western Ghats
B the Himalayas, the Western Ghats, the Indo-Burma region
C the Western Ghats and the Indo-Burma region
D the Himalayas, the Western Ghats, the Madhumalai forest

The correct answer is:
the Himalayas, the Western Ghats, the Indo-Burma region

Solution:
The total number of biodiversity hotspots in the world are 34. These hotspots are also the regions of accelerated habitat loss. Three of these hotspots, Western Ghats, Indo-Burma and Himalaya, cover our country's exceptionally high biodiversity regions.

Topic: Biology, Biodiversity and its Conservation, NEET
Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is given an initial speed v towards B due to which it collides with B perfectly inelastically. The combined mass collides with C, also perfectly inelastically 56th of the initial kinetic energy is lost in the whole process. What is the value of M/m?

Options:
A 3
B 4
C 5
D 2

The correct answer is:
4

Solution:
mv=m+mvâ²
m+mvâ²=m+m+Mvf
â´ final velocity vf=m2m+Mv
Initial energy =12mv2
Final energy =122m+Mmv2m+M2
Given that 5612mv2=12mv2-122m+Mmv2m+M2
112mv2=12m2v22m+M
6m=2m+M
Mm=4

Topic: Physics, Center of Mass Momentum and Collision, NEET
Three blocks A, B and C, of masses 4 kg, 2 kg 1 kg and respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is:

Options:
A 2 N
B 6 N
C 8 N
D 18 N

The correct answer is:
6 N

Solution:
\(\begin{aligned} & F=M a=\left(M_a+M_b+M_c\right) a \\ & 14=(4+2+1) a=7 a \\ & a=2 \end{aligned}\)
Let \(F^{\prime}\) be the contact force between \(\mathrm{A} ~\&~ \mathrm{~B}\),

\(\begin{aligned} & F-F^{\prime}=4 a \\ & 14-F^{\prime}=4 a=4 \times 2 \\ & F^{\prime}=6 N\end{aligned}\)

Topic: Physics, Laws of Motion, NEET, NEET 2015 (Phase 1)
Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is 0.25.
[Assume that rod does not exerts force in vertical direction]

Options:
A 12mg/4
B 13mg/4
C 3 mg
D None

The correct answer is:
13mg/4

Solution:
F-3mg4-6mg4-T=0 ....(i)
T-mg4-3mg4=0 ....(ii)
From equarions (i) and (ii)
â F=13mg4

Topic: Physics, Laws of Motion, NEET
Three blocks of masses m1, m2 and m3 are connected to a massless string on a frictionless table as shown in the figure. They are pulled with a force of 40 N. If m1=10 kg, m2=6 kg and m3=4 kg, then tension T2 will be

Options:
A 10 N

B 20 N

C 32 N

D 40 N

The correct answer is:
20 N

Solution:
Since, the table is frictionless, i.e., it is smooth, therefore, force on the block is given by
F=m1+m2+m3a
â a=Fm1+m2+m3
â a=4010+6+4=4020=2 m s-2
Now, the tension between 10 kg and 6 kg masses is given by
T2=m2+m3a
=4+62=10Ã2
T2=20 N

Topic: Physics, Laws of Motion, NEET
Three blocks of masses m1,m2 and m3 are placed on a horizontal frictionless surface. A force of 40 N pulls the system then calculate the value of T , if m1=10 kg, â¡m2=6 kg, â¡m3=4 kg.

Options:
A 40Â N
B 20 N
C 10Â N
D 5Â N

The correct answer is:
20 N

Solution:
a=Fm1+m2+m3
a=4010+6+4
a=2 m s-2
taking blocks of masses m2 and m3 as a system,
40-T=10Ã2
T=20 N

Topic: Physics, Laws of Motion, NEET
Three blocks of masses m, m and M are kept on a frictionless floor as shown in the figure. The leftmost block is given velocity v towards the right. All the collisions between the blocks are perfectly inelastic. The loss in kinetic energy after all the collisions is 56th of initial kinetic energy. The ratio of Mm will be:

Options:
A 14
B 18
C 2
D 4

The correct answer is:
4

Solution:
mv=m+mvâ²
m+mvâ²=m+m+Mvf
â´ final velocity vf=m2m+Mv
Initial energy =12mv2
Final energy =12(2m+M)mv2m+M2
Given that 5612mv2=12mv2-122m+Mmv2m+M2
112mv2=12m2v22m+M
6m=2m+M
Mm=4

Topic: Physics, Center of Mass Momentum and Collision, NEET
Three blocks with masses $m, 2 m$ and $3 m$ are connected by strings, as shown in the figure. After an upward force $F$ is applied on block $m$, the masses move upward at constant speed $v$. What is the net force on the block of mass $2 m ?$

Options:
A Zero
B $2 \mathrm{mg}$
C $3 \mathrm{mg}$
D $6 \mathrm{mg}$

The correct answer is:
Zero

Solution:
Since all the blocks are moving with constant velocity, then the net force on the all blacks will be zero.

Topic: Physics, Laws of Motion, NEET, NEET 2013 (All India)
Three capacitors each of 4 Î¼F are to be connected in such a way that the effective capacitance is 6 Î¼F. This can be done by connecting them

Options:
A all in series
B all in parallel
C two in parallel and one in series
D two in series and one in parallel

The correct answer is:
two in series and one in parallel

Solution:
For top branch,
1Ceq=14+14
⇒Ceq=2 Ω
For parallel combination, Cnet=2 Ω+4 Ω=6 Ω

Topic: Physics, Electrostatics, NEET
Three capacitors each of capacitance C=2 Î¼F are connected with a battery of emf 30 V as shown in the figure. When the switch S is closed, the heat generated in the circuit will be

Options:
A 0.15 mJ
B 0.30 mJ
C 0.10 mJ
D 0.60 mJ

The correct answer is:
0.30 mJ

Solution:
Ui=12CV32+12CV32+12C2V32
Uf=12CV2
Wb=CV23
ΔH=Wb-Uf-Ui=CV26=0.30 mJ

Topic: Physics, Electrostatics, NEET
Three capacitors each of capacitance $C$ and of breakdown voltage $V$ are joined in series. The capacitance and breakdown voltage of the combination will be

Options:
A $\frac{\mathrm{C}}{3}, \frac{\mathrm{V}}{3}$
B $3 \mathrm{C}, \frac{\mathrm{V}}{3}$
C $\frac{\mathrm{C}}{3}, 3 \mathrm{~V}$
D $3 \mathrm{C}, 3 \mathrm{~V}$

The correct answer is:
$\frac{\mathrm{C}}{3}, 3 \mathrm{~V}$

Solution:
In series arrangement charge on each plate of each capacitor has same magnitude.
The potential difference is distributed inversely in the ratio of capacitors ie,
$$
\mathrm{V}=\mathrm{V}_1+\mathrm{V}_2+\mathrm{V}_3 \ldots
$$
Here, $V=3 V$
The equivalent capacitance $\mathrm{C}_s$ is given by
$$
\begin{aligned}
& \frac{1}{C_s}=\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+\ldots \\
& C_s=\frac{\mathrm{C}}{3}
\end{aligned}
$$

Topic: Physics, Capacitance, NEET, NEET 2009 (Screening)
Three capacitors each of capacity $4 \mu \mathrm{F}$ are to be connected in such a way that the effective capacitance is $6 \mu \mathrm{F}$. This can be done by:

Options:
A connecting all of them in series
B connecting them in parallel
C connecting two in series and one in parallel
D connecting two in parallel and one in series

The correct answer is:
connecting two in series and one in parallel

Solution:
$$
\begin{aligned}
& \mathrm{C}_{\mathrm{AB}}=(2+4) \mu \mathrm{F} \\
& =6 \mu \mathrm{F}
\end{aligned}
$$

Topic: Physics, Capacitance, NEET, NEET 2003
Three capacitors each of capacity 4 Î¼ F are to be connected in such a way that the effective capacitance is 6 Î¼ F . This can be done by

Options:
A Connecting two in parallel and one in series
B Connecting all of them in series
C Connecting them in parallel
D Connecting two in series and one in parallel

The correct answer is:
Connecting two in series and one in parallel

Solution:
For series, C ′ = C 1 Ã C 2 C 1 + C 2 = 4 Ã 4 4 + 4 = 2 Î¼ F

For parallel, C eq = C ′ + C 3 = 2 + 4 = 6 Î¼ F

Topic: Physics, Electrostatics, NEET
Three cells of emf 1 V and internal resistance 1 Î© each are connected as shown. Effective emf of combination between the points P and Q is -

Options:
A Zero
B 1 V
C 2 V
D 23V

The correct answer is:
Zero

Solution:
Two batteries of emf 1 V are combined, and two resistance also combine in series
Enet=E1 r2- E2 r1r1+r2=2 - 22+1=0

Topic: Physics, Current Electricity, NEET
Three charges are placed at the vertex of an equilateral triangle as shown in figure. The value of Q, for which the electrostatic potential energy of the system is zero, is

Options:
A -q
B q2
C -2q
D -q2

The correct answer is:
-q2

Solution:
Electrostatic potential energy of the system of charges is
U=14π∈0 Qqa+Qqa+q2a
U=14π∈02Qq+q2
Given, U=0
2Qq+q2=0
Q=-q2

Topic: Physics, Electrostatics, NEET
Three charges Q0, -q and -q are placed at the vertices of an isosceles right angle triangle as in the figure. The net electrostatic potential energy is zero if Q0 is equal to

Options:
A q4
B q8
C 2q
D q

The correct answer is:
q8

Solution:
U=KQ0–ql×2+K–q–ql2=0
Kql–2Q0+q2=0
∴ Q0=q22=q8

Topic: Physics, Electrostatics, NEET
Three charges â q1, q2 and â q3 are placed as shown in the figure. The x-component of the force on âq1 is proportional to

Options:
A q2b2–q3a2sinθ
B q2b2–q3a2cosθ
C q2b2+q3a2sinθ
D q2b2+q3a2cosθ

The correct answer is:
q2b2+q3a2sinθ

Solution:
x component of force on –q⇒
F1 cos(90 –θ) + F2
= Kq1q3a2sinθ+Kq1q2b2

Topic: Physics, Electrostatics, NEET
Three charges â q 1 ,â+ q 2 and â q 3 are placed as shown in the figure. The xâ component of the force on â q 1 is proportional to

Options:
A q 2 b 2 - q 3 a 2 cos θ
B q 2 b 2 + q 3 a 2 sin Î¸
C q 2 b 2 + q 3 a 2 cos θ
D q 2 b 2 - q 3 a 2 sin θ

The correct answer is:
q 2 b 2 + q 3 a 2 sin θ

Solution:
Force on ( − q 1 ) due to q 2 = q 1 q 2 4π ε 0 b 2
â´ F 1 = q 1 q 2 4 Ï Îµ 0 b 2 along q 1 q 2
Force on - q 1 due to - q 3 = ( q 1 ) ( q 3 ) 4 Ï Îµ 0 a 2
F 2 = q 1 q 3 4 Ï Îµ 0 a 2 as shown
F 2 > makes an angle of 90 0 - Î¸ with q 1 q 2

Resolved part of F 2 along q 1 q 2
= F 2 cos 90 0 −θ
= q 1 q 3 sin Î¸ 4 Ï Îµ 0 a 2 along q 1 q 2
â´ Total force on − q 1
= [ q 1 q 2 4 Ï Îµ 0 b 2 + q 1 q 3 sin Î¸ 4 Ï Îµ 0 a 2 ] along x-axis
â´ x-component of force â [ q 2 b 2 + q 3 a 2 sin Î¸ ] .

Topic: Physics, Electrostatics, NEET
Three charges -q, Q and -q are placed at equal distances on a straight line. If the potential energy of the system of charges is zero, then the ratio Q:q is

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

The correct answer is:
1:4

Solution:
U=-kQqr×2+kq22r=0
2kQqr=kq22r
Qq=14

Topic: Physics, Electrostatics, NEET
Three charges -q, Q and -q are placed at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of Q:q

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

The correct answer is:
1:4

Solution:
U=-kQqr×2+kq22r=0
2×kQqr=kq22r
2×Q1=q2
Qq=14

Topic: Physics, Electrostatics, NEET
Three concentric metallic spherical shells of radii R, 2R, 3R are given Q1, Q2, Q3 respectively. It is found that the surface charge densities on the outer surfaces of shells are equal. Then, the ratio of the charges given to the shells Q1:Q2:Q3 is

Options:
A 1:8:18
B 1:3:5
C 3:4:5
D 1:4:9

The correct answer is:
1:3:5

Solution:
Due to induction, net charge on outer surfaces of spheres will be as
Ï=Q14ÏR2=Q1+Q24Ï2R2=Q1+Q2+Q34Ï3R2
âQ1=Q1+Q24=Q1+Q2+Q39
On solving, we get
Q2=3Q1 and Q3=5Q1
Therefore, Q1:Q2:Q3=1 :3 :5

Topic: Physics, Electrostatics, NEET