datavorous/entrance-exam-dataset huggingface dataset:
A pendulum has time period T for small oscillations. An obstacle P is situated below the point of suspension O at a distance 3l4. The pendulum is released from rest. Throughout the motion the moving string makes small angles with vertical. Time after which the pendulum returns back to its initial position is -

Options:
A T
B 3T/4
C 3T/5
D 4T/5

The correct answer is:
3T/4

Solution:
first half oscillation is covered with length l and second half with length 3l4 therefore total time can be measured by
t=T12+T22
T1=2π1g=T
T2=2π1/4g=T2
Putting value we get t=3T4

Topic: Physics, Oscillations, NEET
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m s-2 at a distance of 5 m from mean position. The time period of oscillation is

Options:
A 2 s
B Ï s
C 2ÏÂ s
D 1Â s

The correct answer is:
Ï s

Solution:
Acceleration in SHM is
a=Ï2x
20=Ï25âÏ2=4âÏ=2â2ÏT=2
T=Ï s

Topic: Physics, Oscillations, NEET, NEET 2018
A pendulum of length 1 m is released from Î¸=60Â°. The rate of change of speed of the bob, at Î¸=30Â°, is ( g=10 ms-2 )

Options:
A 10 m s-2
B 7.5 m s-2
C 5 m s-2
D 53 m s-2

The correct answer is:
5 m s-2

Solution:
When the string makes an angle of 30Â° with the vertical, the component of weight produces the tangential acceleration which is the rate of change of speed

at=gsin30Â°=5 m s-2

Topic: Physics, Oscillations, NEET
A pendulum of length 10 cm is hanged by a wall making an angle 3Â° with vertical. It is swung to position B. Time period of pendulum will be

Options:
A π5 s
B 2π15 s
C π6 s
D subsequent motion will not be periodic

The correct answer is:
2π15 s

Solution:
Let T=2πlg
T=2π0.110=π5 s
Time taken by the pendulum in going from A to B=T4
Time taken by the pendulum in going from B to C=T12
∴ The time period of the pendulum =2T4+T12=2T3=23.π5=2π15 s

Topic: Physics, Oscillations, NEET
A pendulum of length 200 cm is horizontal, when its bob of mass 200 gm, is released. It has 90% of initial energy when the bob reaches the lower most point. Speed of the bob at this point is

Options:
A 8 m s-1
B 4.5 m s-1
C 5 m s-1
D 6 m s-1

The correct answer is:
6 m s-1

Solution:
v=2gh when 100% energy gets converted.
But here 12mv2=0.9 mgh
i.e. v=1.8gh âv=1.8Ã10Ã2=6 m s-1

Topic: Physics, Oscillations, NEET
A pendulum of length L carries a negative charge -q on the bob. A positive charge +q is held at the point of support. Then, the time period of the bob is

Options:
A Greater thanÂ 2ÏLg
B Less than 2ÏLg
C equal to 2πLg
D Equal to 2Ï2Lg

The correct answer is:
equal to 2πLg

Solution:
There is no change in the restoring force as the electrostatic forces are the central forces. Negative and positive charges at the two extremities of the string affect tension T which does not affect the restoring force

Topic: Physics, Magnetic Properties of Matter, NEET
A pendulum with the time period of 1 s is losing energy due to damping. At a certain time, its energy is 45 J. If after completing 15 oscillations its energy has become 15 J, then its damping constant (in s-1) will be

Options:
A 12
B 115ln⁡3
C 130ln⁡3
D 2

The correct answer is:
130ln⁡3

Solution:
Energy of a damping oscillator is E=E0e-2γt at time t where γ=damping constant

E' =Eoe-2γt
15=45e-2γ15
γ=130ln⁡(3)

Topic: Physics, Oscillations, NEET
A perfect gas at 27 °C is heated at constant pressure so as to triple its volume. The temperature of the gas will be

Options:
A 81 °C
B 900 °C
C 627 °C
D 450 °C

The correct answer is:
627 °C

Solution:
At constant pressure V∝T
⇒V1V2=T1T2
⇒V3V=273+27T2
⇒T2=900 K=627 °C

Topic: Physics, Thermodynamics, NEET
A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is

Options:
A Total lung capacity
B Tidal volume
C Vital capacity
D Inspiratory capacity

The correct answer is:
Vital capacity

Solution:
Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume.

Topic: Biology, Breathing and Exchange of Gases, NEET
A person breathing normally at rest takes in and expels approximately half a litre of air during each respiratory cycle. This is called

Options:
A Inspiratory reserve volume
B Tidal volume
C Expiratory reserve volume
D Vital capacity

The correct answer is:
Tidal volume

Solution:
The volume of air breathed in and out involuntarily in each normal breath is called tidal volume or TV. It is about 500 ml of air in average young adult man.

Topic: Biology, Breathing and Exchange of Gases, NEET
A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Options:
A Convex, +2.25 D

B Concave, -0.25 D

C Concave, -0.2 D

D Convex, + 0.15 D

The correct answer is:
Concave, -0.25 D

Solution:
The maximum distance of distinct vision = 400 cm. So the image of the object at infinity is to be formed at 400 cm.
Use lens formula
1v-1u=1f
1-400-1∞=1f
P=-0.25 D

Topic: Physics, Ray Optics, NEET, NEET 2016 (Phase 2)
A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Options:
A Convex, +2.25 D

B Concave, -0.25 D

C Concave, -0.2 D

D Convex, + 0.15 D

The correct answer is:
Concave, -0.25 D

Solution:
The maximum distance of distinct vision = 400 cm. So the image of the object at infinity is to be formed at 400 cm.
Use lens formula
1v-1u=1f
1-400-1∞=1f
P=-0.25 D

Topic: Physics, Ray Optics, NEET
A person entering an empty room suddenly finds a snake right in front of the door. Which one of the following is likely to happen in his neuro-hormonal control system?

Options:
A Hypothalamus activates the parasympathetic division of the brain and release of Corticotropin-releasing hormone to stimulate the release of hormone-like the adrenalin from the adrenal medulla
B Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse to stimulate the release of androgens from the adrenal cortex.
C The sympathetic nervous system is activated stimulating release of epinephrine and norepinephrine from the adrenal medulla.
D The parasympathetic nervous system is activated stimulating release of epinephrine and norepinephrine from the adrenal medulla.

The correct answer is:
The sympathetic nervous system is activated stimulating release of epinephrine and norepinephrine from the adrenal medulla.

Solution:
Epinephrine and norepinephrine are secreted by the adrenal medulla in response to the stress of any kind and during emergency situations and are called emergency hormones or hormones of flight or fight.

Topic: Biology, Neural Control and Coordination, NEET
A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?

Options:
A Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
B Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
C Hypothalamus activates the parasympathetic division of brain
D Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex

The correct answer is:
Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla

Solution:
Epinephrine and nor-epinephrine are secreted by adrenal medulla (under the control of sympathetic nervous system) in response to stress of any kind or during emergency situations. These are also called emergency hormones or hormones of flight, fight and fright (triple F hormone).

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2012 (Screening)
A person had some visual difficulties. His examination revealed corneal inflammation and was diagnosed with snow blindness. Which environmental condition may have played a role in his illness?

Options:
A Ozone depletion
B Radiation Hazard
C Air Pollution
D Agro chemicals

The correct answer is:
Ozone depletion

Solution:
Good ozone found in upper part of atmosphere called as stratosphere absorbs UV radiation from sunlight which are injurious to living organisms. With increasing use of chlorofluorocarbons, there is damage to ozone layer resulting in Ozone hole. Due to ozone depletion there is increased risk of eye problems such as inflammation of cornea known as snow blindness, cataract and permanent damage of cornea as a consequence of absorption of UV radiation.

Topic: Biology, Environmental Issues, NEET
A person has cardiac output 5600ml/minute and stroke volume 70 ml. What would be the number of heartbeats in 2 minutes in this person?

Options:
A 80 heart beats
B 70 heart beats
C 140 heart beats
D 160 heart beats

The correct answer is:
160 heart beats

Solution:
Cardiac Output = Stroke Volume x Heart beats/min
Heart beats/min = Cardiac Output/Stroke Volume
= 5600 ml/70ml
= 80
Therefore, number of heart beats of this person in 2 minutes = 80 Ã 2 =160 .

Topic: Biology, Body Fluids and Circulation, NEET
A person has exhaled forcefully. The amount of air present in his lungs is

Options:
A 0 litres
B 3 litres
C 1.2 litres
D 0.5 litres

The correct answer is:
1.2 litres

Solution:
Residual volume is amount of air present in the lungs after forceful expiration. This is around 1100- 1200 ml i.e. 1.2 litres. This prevents collapse of alveoli. This is measured by helium method. This air fills in the lungs as the child breathes in for the first time. Thus assessment of residual volume can also help us to know whether the death of foetus was still birth or it died after birth.

Topic: Biology, Breathing and Exchange of Gases, NEET
A person has undergone vasectomy. Which of the following statements regarding him is correct?

Options:
A His semen won't have any sperms
B His semen will contain sperms
C His body will not produce any semen
D His body will not produce any sperms

The correct answer is:
His semen won't have any sperms

Solution:
Vasectomy is cutting and ligation of vas deferens. The testis is fully functional and will produce sperms. The seminal vesicles and prostate will also produce their secretions which form the major portion of semen. At the end of intercourse, this person will release semen without sperms as the sperms cannot reach the ejaculatory ducts.

Topic: Biology, Reproductive Health, NEET
A person having blood group O can receive blood of:

Options:
A Group O, B and AB
B Group B, O and AB
C Group B and AB
D Group ‘O' only

The correct answer is:
Group ‘O' only

Solution:
Blood group ‘O’ contains both antibodies but no antigens.

Topic: Biology, Principles of Inheritance and Variation, NEET
A person having genotype IAIB would show the blood group as AB. This is because

Options:
A Pleiotropy
B Codominance
C Incomplete dominance
D Lethal effect

The correct answer is:
Codominance

Solution:
ABO blood group is controlled by gene I having three alleles IA, IB and I The alleles IA and IBproduces a slightly different form of sugar while allele I does not produces any sugar. Because humans are diploid, each person possesses any two alleles. When IA and IBare present together they both expresses their own types of sugars, this is because of codominance.

Topic: Biology, Principles of Inheritance and Variation, NEET
A person having which of these blood groups is surely homozygous?

Options:
A O Rh+ve
B A Rh-ve
C AB Rh+ve
D O Rh-ve

The correct answer is:
O Rh-ve

Solution:
Rh antigen follows normal Mendelian inheritance. If 'R' is the allele that produces Rhesus antigen and 'r' is the allele which doesn't, then a person with Rh+ve blood group can be RR or Rr while a person with Rh-ve blood group will always be rr (always homozygous). A person with A blood group may have genotype IaIa or IaIo. A person with AB blood group has genotype IaIb. A person with blood group O has genotype IoIo (always homozygous).

Topic: Biology, Body Fluids and Circulation, NEET
A person holding a rifle (mass of person and rifle together is $100 \mathrm{~kg}$ ) stands on a smooth surface and fires 10 shots horizontally, in $5 \mathrm{~s}$. Each bullet has a mass of $10 \mathrm{~g}$ with a muzzle velocity of $800 \mathrm{~ms}^{-1}$. The final velocity acquired by the person and the average force exerted on the person are:

Options:
A $-0.08 \mathrm{~ms}^{-1}, 16 \mathrm{~N}$
B $-0.08 \mathrm{~ms}^{-1}, 16 \mathrm{~N}$
C $-0.08 \mathrm{~ms}^{-1}, 16 \mathrm{~N}$
D $-0.08 \mathrm{~ms}^{-1}, 16 \mathrm{~N}$

The correct answer is:
$-0.08 \mathrm{~ms}^{-1}, 16 \mathrm{~N}$

Solution:
Using law of conservation of moments
$\begin{aligned}
& \text {Initial momentum }=m u_1+m u_2 \\
& \text {final momentum }=n m v_1+ \\
& (M-n m) v_2 \\
& \therefore m u_1+m u_2=n m v_1+(M-n m) v_2 \\
& 0=\frac{10 \times 10}{1000} \times 800 +\left(100-\frac{10 \times 10}{1000}\right) r^2
\end{aligned}$
$\begin{aligned}
-80 & =\frac{999}{10} v_2 \\
\Rightarrow v_2 & =-0.8 \mathrm{~ms}^{-1}
\end{aligned}$
And average force exerted on the person
$\begin{array}{l}
=\frac{n \times m \times u}{\Delta t} \\
=\frac{n \times m \times u}{\Delta t} \\
=\frac{10 \times \frac{1 \mathrm{G}}{1000} \times 800}{5} \\
=\frac{80}{5}=16 \mathrm{~N}
\end{array}$

Topic: Physics, Center of Mass Momentum and Collision, NEET, NEET 2013 (Karnataka)
A person holds a bucket of weight 60 N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the man is

Options:
A 300 J

B 420 J
C 720 J
D None of these

The correct answer is:
300 J

Solution:
No work is done while covering the horizontal distance because F→.s→=0 ∵ θ=90°
But work is done during vertical displacement which is given by
Fh=60×5=300 J

Topic: Physics, Work Power Energy, NEET
A person in an elevator accelerating upwards with an acceleration of 2 m/s² tosses a coin vertically upwards with a speed of 20 m/s. After how much time will the coin fall back into his hand? (Given: g = 10 m/s²)

Options:
A 2.5 s
B 3.0 s
C 3.33 s
D 4.0 s

The correct answer is:
3.33 s

Solution:
Correct Option is : (C)
3.33 s

Topic: Chemistry, Laws of Motion, NEET
A person injured in a road accident requiring an urgent immune response was brought to the doctor. The doctor immediately gave an ATS injection. What type of immunity was provided to the patient?

Options:
A Artificially acquired active immunity
B Naturally acquired active immunity
C Naturally acquired passive immunity
D

Artificially acquired passive immunity

The correct answer is:

Artificially acquired passive immunity

Solution:
Passive immunity is a kind of immunity in which readymade antibodies (gamma globulins), obtained from human or animal serum, are injected into the human body to provoke an immediate immune response.
Road accidents are accompanied with broken skin and dirt which urges doctors to prescribe anti-tetanus injections. ATS stands for anti-tetanus serum, which is a form of artificially acquired passive immunity.

Topic: Biology, Human Health and Diseases, NEET
A person is found to be suffering from neuromuscular junctions leading to fatigue, weakening and muscular paralysis of muscles possibly via autoimmune disorder. Which of the following disease is the patient most likely suffering from?

Options:
A Muscular dystrophy
B Muscular tetany
C Myasthenia gravis
D Poliomyelitis

The correct answer is:
Myasthenia gravis

Solution:
Myasthenia gravis is a neuromuscular disorder where the patient shows weakness and fatigue in voluntary muscles regulation. It is an autoimmune disorder resulting in loss of muscle function and muscle loss in long term. Onset of such disease is sudden and exact cause is still unclear.

Topic: Biology, Locomotion and Movement, NEET
A person is injured in an accident and there is blood spurting out from his wrist. The most correct inference is that

Options:
A He has an injured artery
B He has an injured vein
C He has an injured vena cava
D He has an injured nerve

The correct answer is:
He has an injured artery

Solution:
Arteries are thick walled blood vessels which carry oxygenated blood under high pressure. The flow of blood in arteries is pulsatile. Thus, injury to arteries causes spurting of blood. Veins are thin walled blood vessels which carry deoxygenated blood under low pressure. So injury to veins causes oozing of blood.

Topic: Biology, Body Fluids and Circulation, NEET
A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of:

Options:
A fats
B amino acids
C glucose
D ketones.

The correct answer is:
ketones.

Solution:
The fat when burned to the energy, it releases many ketones in the blood and so urine. This process of producing energy by the fats is fat acid catabolism. Hence a large amount of the ketone gets eliminated in the urine causing ketonuria.
Related Theory
A condition in which abnormally high amounts of ketones and ketone bodies (a by product of the breakdown of cells) are present in the urine is called Ketonuria. It is a sign seen in extreme case of diabetes mellitus.

Topic: Biology, Digestion and Absorption, NEET, NEET 2005
A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed

Options:
A on the blind spot.
B behind the retina.
C in front of the retina.
D on the yellow spot.

The correct answer is:
in front of the retina.

Solution:
In myopia or short-sightedness, eyeball becomes longer and the image is formed before the retina. This defect of the eye can be corrected by using spectacles with concave lenses.

Topic: Biology, Neural Control and Coordination, NEET
A person likely to develop tetanus is immunised by administering

Options:
A dead germs
B preformed antibodies
C wide spectrum antibiotics
D weakened germs

The correct answer is:
preformed antibodies

Solution:
In passive immunity, the antibodies are produced in some other organisms ( $\mathrm{gg}$, horse) in response to the given antigen. These antibodies are then injected into the human body at the time of need. This is known as inoculation, eg, persons infected by tetanus, rabies, Salmonella and snake venom are given the sufficient amount of antibodies, so that they can survive.

Topic: Biology, Human Health and Diseases, NEET, NEET 2009 (Screening)
A person normally weighing 50 kg stands on a massless platform which oscillates up and down harmonically at a frequency of 2.0 s–1 and an amplitude 5.0 cm. A weighing machine on the platform gives the person's weight against time. What will be the maximum reading in the machine?

Options:
A 200 N
B 350 N
C 650 N
D 890 N

The correct answer is:
890 N

Solution:
Correct Option is : (D)
890 N

Topic: Chemistry, Oscillations, NEET
A person observes that the full length of a train subtends an angle of 15Â°. If the distance between the train and the person is 3 km, the length of the train, calculated using the parallax method, in meters is

Options:
A 45
B 45π
C 250π
D 75π

The correct answer is:
250π

Solution:
Full length of the train subtends 15° angle
15°=15×π180 rad
=π12 rad
Given that, the distance between the train and person is 3 km.
i.e., 3 km=3000 m
Length of the train = Radius × Angle = 3000×π12
=250π m​

Topic: Physics, Units and Dimensions, NEET
A person of mass $60 \mathrm{~kg}$ is inside a lift of mass $940 \mathrm{~kg}$ and presses the button on control panel. The lift starts moving upwards with an acceleration $1.0 \mathrm{~m} / \mathrm{s}^2$. If $g=10 \mathrm{~m} / \mathrm{s}^2$, the tension in the supporting cable is

Options:
A $9680 \mathrm{~N}$
B $11000 \mathrm{~N}$
C $1200 \mathrm{~N}$
D $8600 \mathrm{~N}$

The correct answer is:
$11000 \mathrm{~N}$

Solution:
$$
\begin{aligned}
& \text { Total mass }=\text { Mass of lift }+ \text { Mass of person } \\
& =940+60=1000 \mathrm{~kg} \\
& T-m g=m a \\
& \text { Hence, } T-1000 \times 10=1000 \times 1 \\
& T=11000 \mathrm{~N} \\
&
\end{aligned}
$$

Topic: Physics, Laws of Motion, NEET, NEET 2011 (Screening)
A person passes much urine and drinks much water but his blood glucose level is normal. This condition may be the result of

Options:
A A reduction in insulin secretion from pancreas
B A reduction in vasopressin secretion from posterior pituitary
C A fall in the glucose concentration in urine
D An increase in secretion of glucagon

The correct answer is:
A reduction in vasopressin secretion from posterior pituitary

Solution:
As the basic function of vasopressin (a hormone secreted from neurohypophysis) is to conserve body's water. Its failure or hyposecretion leads to a reduction in renal absorption of water and a consequent elimination of a large volume of dilute (hypotonic) urine, i.e., diabetes insipidus.

Topic: Biology, Chemical Coordination and Integration, NEET
A person pushes a block of mass 4 kg up a frictionless inclined plane 10 m long and that makes an angle of 30Â° with the horizontal. Then the work done is

Options:
A 33.5Â J
B -392 J
C 339.4 J
D –196 J

The correct answer is:
–196 J

Solution:
W= - (Mg Sin θ) d

Topic: Physics, Work Power Energy, NEET
A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

Options:
A Outside the car
B In the car ahead of the person
C In the car to the side of the person
D Exactly in the hand which threw it up

The correct answer is:
Exactly in the hand which threw it up

Solution:
Horizontal velocity of ball and person are same so both will cover equal horizontal distance in a given interval of time and after following the parabolic path the ball falls exactly in the hand which threw it up.

Topic: Physics, Motion In Two Dimensions, NEET
A person sitting in the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? g=10 m s-2

Options:
A 15.5 m s-1
B 14.5 m s-1
C 4.5 m s-1
D 20 m s-1

The correct answer is:
14.5 m s-1

Solution:
First, recall the second equation of motion of kinematics, in terms of initial speed, time, and uniform acceleration, s=ut+12at2. Now make a diagram related to motion of the particle,

then put the values in second equation of motion,

⇒1.5=u(0.1)+12(10)(0.1)(0.1)⇒15=u+0.5

⇒u=14.5 m s-1.

Topic: Physics, Motion In Two Dimensions, NEET, NEET 2020 (Phase 2)
A person sitting on a chair in a satellite feels weightless because

Options:
A The earth dose not attract the object in a satellite
B The normal force by the chair on the person balances the earth's attraction
C The normal force is zero
D The person in satellite is not accelerated

The correct answer is:
The normal force is zero

Solution:
A person feels weightlessness in satellite orbit because he is in free fall along with the satellite and experiences no force of support from the satellite. The perception of weight comes from the support force exerted on one by the floor, a chair etc. If that support is removed and one is in free fall, we feel no experience of weight.

Topic: Physics, Gravitation, NEET
A person suffering from cancer is treated with radiotherapy. Which of the following techniques is used in this treatment?

Options:
A All tumour cells and surrounding normal cells get killed
B It is meant to cure damaged DNA
C Radiations activated p53 gene of tumour cell
D Tumour cells are irradiated lethally

The correct answer is:
Tumour cells are irradiated lethally

Solution:
Radiotherapy is one of the treatments of cancer, where tumour cells are irradiated lethally taking great care to not damage the surrounding tissues and cells.

Topic: Biology, Human Health and Diseases, NEET