datavorous/entrance-exam-dataset huggingface dataset:
The tallest positive wave in ECG represents

Options:
A atrial depolarization.
B ventricular depolarization.
C atrial repolarization.
D ventricular repolarization.

The correct answer is:
ventricular depolarization.

Solution:
The record of the electrical activities of the heart is called an electrocardiogram (ECG). The waves of ECG include PQRS waves. P wave-which represents the depolarization of the atria, the QRS complex, which represents the depolarization of the ventricles, and the T wave represents the ventricular repolarization. The waves above the isopotential line are called positive waves and the ones below it are called negative waves. P, R and T are positive waves while Q and S are negative wave. R is the tallest wave which is a part of QRS complex.

Topic: Biology, Body Fluids and Circulation, NEET
The tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60o and 45o respectively. The ratio of the number of turns in the coil is

Options:
A 43
B 3+11
C 3+13-1
D 31

The correct answer is:
31

Solution:
In series current is same. In tangent galvanometer
B=BHtan⁡θ⇒μ0ni2R=BH tanθ
∵i= same
∴n ∝tan⁡θ⇒n1n2=tan⁡60otan⁡45o=31

Topic: Physics, Magnetic Properties of Matter, NEET
The tangential, as well as radial walls of the endodermal cells, have a deposition of water-impermeable, waxy material suberin in the form of

Options:
A Epiblema
B Phellem
C Phelloderm
D Casparian strips

The correct answer is:
Casparian strips

Solution:
The tangential, as well as radial walls of the endodermal cells, have a deposition of water-impermeable, waxy material suberin in the form of casparian strips.

Topic: Biology, Anatomy of Flowering Plants, NEET
The tapetal nuclei in anthers of many angiosperm flowers are

Options:
A Aneuploid
B Polyploid
C Haploid
D Not having complete haploid genome

The correct answer is:
Polyploid

Solution:
Tapetum cells are multinucleate (undergo endo-polyploidy).

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The tapetum is responsible for the nourishment of

Options:
A egg apparatus.
B egg.
C embryo.
D pollens.

The correct answer is:
pollens.

Solution:
In a transverse section, a typical microsporangium appears near circular in outline. It is generally surrounded by four wall layers the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum. It nourishes the developing pollen grains.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The Taq polymerase enzyme is obtained from:

Options:
A Thermus aquaticus
B Thiobacillus ferroxidans
C Bacillus subtilis
D Pseudomonas putida

The correct answer is:
Thermus aquaticus

Solution:
The enzyme Taq polymerase is a thermostable enzyme that is obtained from Thermus aquaticus.

Taq DNA Polymerase catalyzes the incorporation of dNTPs into DNA during the polymerase chain reaction.

Taq polymerase helps in the replication of DNA. Due to the thermophilic nature, these enzymes are stable at high temperatures and used in PCR.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2016 (Phase 1)
The taxonomic categories: Musca, Muscidae, Diptera, Insecta and Arthropoda are related to which of the following organisms?

Options:
A Man
B Tortoise
C Bat
D Housefly

The correct answer is:
Housefly

Solution:
Common name	Biological name	Genus	Family	Order	Class	Phylum/ Division

Housefly	Musca domestica	Musca	Muscidae	Diptera	Insecta	Arthropoda

Topic: Biology, The Living World, NEET
The taxonomic unit 'Phylum' in the classification of animals is equivalent to which hierarchical level in classification of plants?

Options:
A Class
B Order
C Division
D Family

The correct answer is:
Division

Solution:
Classes comprising animals like fishes, amphibians, reptiles, birds along with mammals constitute the next higher category called Phylum. In the case of plants, classes with a few similar
characters are assigned to a higher category called Division.

Topic: Biology, The Living World, NEET
The taxonomic unit 'Phylum' is used in the classification of animals only, which term is equivalent to a phylum in the classification of plants?

Options:
A Class
B Order
C Division
D Family

The correct answer is:
Division

Solution:
In a taxonomical hierarchy, term phylum is used only for animal kingdom. In plant kingdom, term division is used in place of the phylum. According to ICBN specific suffix has been specified for different categories. Name of the division should end with suffix - phyta.

Topic: Biology, The Living World, NEET
The technical term used for the androecium in a flower of china rose (Hibiscus rosa Sinensis) is

Options:
A Monadelphous
B Diadelphous
C Polyandrous
D Polyadelphous

The correct answer is:
Monadelphous

Solution:
China rose of Malvaceae family possess numerous stamens. The filaments of stamens are united in one group thus forming a staminal tube around the style. Such stamens are called monadelphous.

Topic: Biology, Morphology of Flowering Plants, NEET
The technique called gamete intrafallopian transfer (GIFT) is recommended for those females:

Options:
A Who cannot produce an ovum
B Who cannot retain the foetus inside uterus.
C Whose cervical canal is too narrow to allow passage for the sperms
D Who cannot providee suitable environment for fertilisation.

The correct answer is:
Who cannot produce an ovum

Solution:
Gamete intrafallopian transfer (GIFT) is recommended for those females who cannot produce an ovum. In this process, the eggs of the donor woman are removed and in a form of a mixture with sperm transferred into the fallopian tube of another woman who cannot produce ovum, but can provide a suitable environment for fertilization. Thus in GIFT, site of fertilization is fallopian tube, not laboratory.

Topic: Biology, Reproductive Health, NEET
The technique of direct introduction of gametes into the oviduct is called

Options:
A Artificial insemination
B ICSI
C GIFT
D IVF-ET

The correct answer is:
GIFT

Solution:
Transfer of an ovum collected from a donor into the fallopian tube (GIFT – gamete intrafallopian transfer) of another female who cannot produce one, but can provide a suitable environment for fertilisation and further development is another method attempted.

Topic: Biology, Reproductive Health, NEET
The technique polymerase chain reaction was developed by ________ .

Options:
A Kerry Muller
B Kary B. Muller
C Kary B. Mullis
D Kent Mullis

The correct answer is:
Kary B. Mullis

Solution:
Polymerase chain reaction, also known as gene amplification, was developed by Kary B. Mullis to make multiple copies of specific DNA in an artificial medium. PCR can detect the pathogens (bacteria or virus) at very low concentrations by the amplification of nucleic acids even before the development of the symptoms. Few uses of PCR:
(i) PCR can detect HIV in suspected patients of AIDS.
(ii) PCR can detect mutations in genes in suspected patients of cancer.

Topic: Biology, Biotechnology - Principles and Processes, NEET
The technique which helps to prevent fertilisation of the stigma by any undesired pollen by covering the emasculated flower with a polybag or butter paper is called ____.

Options:
A Emasculation
B Bagging technique
C Self-incompatibility
D None of the above

The correct answer is:
Bagging technique

Solution:
The technique which helps to prevent fertilisation of the stigma by any undesired pollen by covering the emasculated flower with a polybag or butter paper is called bagging technique

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
The technology of biogas production from cow dung was developed in India largely due to the efforts of

Options:
A Gas Authority of India
B Oil and Natural Gas Commission
C Indian Agricultural Research Institute and Khadi and Village Industries Commission
D Indian Oil Corporation

The correct answer is:
Indian Agricultural Research Institute and Khadi and Village Industries Commission

Solution:
The technology of biogas production from cow dung was developed in India largely due to the efforts of Indian Agricultural Research Institute and Khadi and Village Industries Commission.

Topic: Biology, Microbes in Human Welfare, NEET
The telomeres of eukaryotic chromosomes consist of short sequences of:

Options:
A thymine rich repeats
B cytosine rich repeats
C adenine rich repeats
D guanine rich repeats.

The correct answer is:
guanine rich repeats.

Solution:
The ends of eukaryotic chromosomes contain repetitive DNA sequences called telomeres, which help to ensure that no information is lost from chromosome ends during DNA replication, rich in guanine repeats.
Related Theory
A highly conserved repetitive DNA sequence, (TTAGGG)n, present at the telomeres of human chromosomes. Each time a cell divides, the telomeres become shorter.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2004
The telomeres of eukaryotic chromosomes consist of short sequences of

Options:
A Thymine rich repeats
B Cytosine rich repeats
C Adenine rich repeats
D Guanine rich repeats

The correct answer is:
Adenine rich repeats

Solution:
Telomeres are non-sticky terminal ends of the chromosomes. Telomeres are rich in heterochromatin and repetitive DNA sequences, which are usually adenine rich.

Topic: Biology, Molecular Basis of Inheritance, NEET
The telomeres of eukaryotic chromosomes consists of short sequences of

Options:
A thymine rich repeats
B cytosine rich repeats
C adenine rich repeats
D guanine rich repeats

The correct answer is:
guanine rich repeats

Solution:
Telomeres are non sticky terminal ends of the chromosomes.It has heterochromatin and repetitive DNA of guanine rich repeats.

Topic: Biology, Molecular Basis of Inheritance, NEET
The temperature at which the reaction

Ag2Osâ2Ags+12O2(g) at 1 atmospheric pressure will be in equilibrium at ___K. The value of âH and âS for the reaction are 30.58 kJ and 66.11 JK-1 respectively and these value do not change much with temperature.

Options:
A 462.6 K
B 486.4 K
C 364.5 K
D 521.2 K

The correct answer is:
462.6 K

Solution:
Ag2Osâ2Ags+12O2(g)
The reaction will be in equilibrium at temperature T=âHâS=30.58Ã10366.11=462.6 K

Topic: Chemistry, Thermodynamics (C), NEET
The temperature at which the speed of sound in the air becomes double of its value at 27 Â°C, is

Options:
A -123 °C
B 927 °C
C 327 °C
D 54 °C

The correct answer is:
927 °C

Solution:
From the formula for the speed of sound in air
v1v2=T1T2
Or v⁡ 1 2 v⁡ 1 =273+27T2
Or 12=300T2
Squaring the Eq. (i), we get
14=300T2
Or T2=300×4=1200 K
= 1200 - 273 = 927 °C

Topic: Physics, Waves and Sound, NEET
The temperature coefficient of a cell whose cell reaction is
Pb(s)+HgCl2(aq)→PbCl2(aq)+Hg(l)
dEdTP=1.5×10-4VK-1 at 298
The change in entropy for the given cell reaction will be

Options:
A 12.6
B 28.95
C 56.8
D 88.86

The correct answer is:
28.95

Solution:
dEdTP=ΔSnF
1.5×10-4=ΔS2×96500
ΔS=28.95JK-1mol-1 .

Topic: Chemistry, Thermodynamics (C), NEET
The temperature coefficient of a reaction is 2. When the temperature is increases from 30°C to 90°C , the rate of reaction is increased by

Options:
A 150 times
B 410 times
C 72 times
D 64 times

The correct answer is:
64 times

Solution:
Temperature coefficient 2 means rate of reaction doubles at every 10°C rise in temperature.
Thus, k90°Ck30°C=26=64

Topic: Chemistry, Chemical Kinetics, NEET
The temperature dependence of rate constant $(k)$ of a chemical reaction is written in terms of Arrhenius equation, $\mathrm{k}=\mathrm{A} \cdot e^{-\mathrm{Ea} / \mathrm{RT}}$. Activation energy $\left(\mathrm{E}_a\right)$ of the reaction can be calculated by ploting:

Options:
A $k$ vs T
B $k$ vs $\frac{1}{\log \mathrm{T}}$
C $\log k$ vs $\frac{1}{\mathrm{T}}$
D $\log k$ vs $\frac{1}{\log \mathrm{T}}$

The correct answer is:
$\log k$ vs $\frac{1}{\mathrm{T}}$

Solution:
We can calculate the Activation Energy by graphing ln k versus 1/T. When the $\ln k$ (rate constant) is plotted versus the inverse of the temperature (kelvin), the slope is a straight line. The value of the slope $(\mathrm{m})$ is equal to $-\mathrm{Ea} / \mathrm{R}$ where $\mathrm{R}$ is a constant equal to $8.314 \mathrm{~J} / \mathrm{mol}-\mathrm{K}$.

Topic: Chemistry, Chemical Kinetics, NEET, NEET 2003
The temperature dependence of resistance of Cu and undoped Si in the temperature range 300-400 K is best described by

Options:
A linear increase for Cu, exponential decrease for Si
B linear decrease for Cu, linear decrease for Si
C linear increase for Cu, linear increase for Si
D linear increase for Cu, exponential increase for Si

The correct answer is:
linear increase for Cu, exponential decrease for Si

Solution:
Resistance variation with temperature: resistance of a metal increases with increase in temperature linearly and resistance of a semiconductor decreases exponentially with increase in temperature.

Topic: Physics, Semiconductors, NEET
The temperature gradient in a 0.5 m long rod is 80 Â°C m-1. If the temperature of the hotter end of the rod is 30 Â°C, then the temperature of the cooler end is

Options:
A 40 °C
B -10 Â°C
C 10 °C
D 0 °C

The correct answer is:
-10 Â°C

Solution:
âdTdx=80
âT2-T1l=80
â30-T10.5=80
â30-T1=40
âT1=-10 Â°C

Topic: Physics, Thermal Properties of Matter, NEET
The temperature gradient in the earth's crust is 32 Â°C km-1 and the mean conductivity of earth is 0.008 cal s-1 cm-1 Â°C-1. Considering the earth to be a sphere of radius 6000 km, the loss of heat by the earth every day is about

Options:
A 1030 cal
B 1040 cal
C 1020 cal
D 1018 cal

The correct answer is:
1018 cal

Solution:
∆Q=KA∆T∆x∆t
=0.008102×4 ×2276×1082×32103×86400
≈1018 cal

Topic: Physics, Thermal Properties of Matter, NEET
The temperature inside a refrigerator is t2 oC and the room temperature is t1 oC. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

Options:
A t1t1-t2
B t1+273t1-t2
C t2+273t1-t2
D t1+t2t1+273

The correct answer is:
t1+273t1-t2

Solution:
K=Q2W=1t1t2-1

Q2=t2Wt1-t2.

Q1=Q2+W=t2Wt1-t2+W

=t1Wt1-t2.

Since, t1 & t2 are in oC & W = 1  J,

Q 1 = t 1 +273 t 1 − t 2 .

Topic: Physics, Thermodynamics, NEET, NEET 2016 (Phase 2)
The temperature of 5 moles of a gas at constant volume is changed from 100 Â°C to 120 Â°C. The change in internal energy is 80 J. The total heat capacity of the gas at constant volume (in J K-1) is

Options:
A 8
B 4
C 0.8
D 0.4

The correct answer is:
4

Solution:
Number of moles n=5 mol, T1=100 °C
T2=120 °C, ∆U=80 J
Rise in temperature ∆T=120-100=20 °C
∆U=ms∆T
805=1×s×20
s=0.8 J
∴ For 5 mol, s=0.8×5 J K-1=4 J K-1

Topic: Physics, Thermodynamics, NEET
The temperature of 5 moles of a gas which was held at constant volume was changed from 100 Â°C to 120 Â°C. The change in internal energy was found to be 80 J. The total heat capacity of the gas at constant volume will be equal to

Options:
A 8 J K-1
B 0.8 J K-1
C 4 J K-1
D 0.4 J K-1

The correct answer is:
4 J K-1

Solution:
At constant volume the internal energy will be utilized in increasing the temperature of gas, i.e.,
ΔQv=μCvΔT=μCv120-100=80 J
⇒ μCv=8020=4 J/K

Topic: Physics, Thermodynamics, NEET
The temperature of 20 L of nitrogen was increased from 10 K to 30 K at a constant pressure. Change in volume will be

Options:
A 20 L
B 40 L
C 60 L
D 80 L

The correct answer is:
40 L

Solution:
V1T1=V2T2
2010=V230 âV2=60 L
V2 âV1=60-20=40 L

Topic: Chemistry, States of Matter, NEET
The temperature of a body on Kelvin scale is found to be x K . When it is measured by a Fahrenheit thermometer, it is found to be x F . Then the value of x is

Options:
A 301.25
B 574.25
C 313
D 40

The correct answer is:
574.25

Solution:
x-273373-273=f-32212-32
⇒ x-273=59x-32
⇒ 9x-9273=5x-160
⇒ x=574.25

Topic: Physics, Thermal Properties of Matter, NEET
The temperature of a gas contained in a closed vessel of constant volume increases by 1 Â°C when the pressure of the gas is increased by 1%. The initial temperature of the gas is

Options:
A 100 K

B 273 °C

C 100 °C

D 200 K

The correct answer is:
100 K

Solution:
According to Gay Lussac's law pâT
â´ dppÃ100=dTTÃ100
1= 1TÃ100
â T=100 K

Topic: Physics, Kinetic Theory of Gases, NEET
The temperature of a gas is -50 °C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?

Options:
A 223 K
B 669 °C
C 3295 °C
D 3097 K

The correct answer is:
3295 °C

Solution:
RMS speed is given by, v=3RTM.

Therefore,

v∝T.

Given:

Initial temperature, T1=-50+273 K=223 K

Let, initial speed be v, then final speed will be v+3v=4v.

Now,

4vv=T2T1⇒T2=16T1=3568 K=3568-273 °C=3295 °C

Topic: Physics, Kinetic Theory of Gases, NEET, NEET 2023 (All India)
The temperature of a sample of gas is raised from 127°C to 527°C . The average kinetic energy of the gas.

Options:
A Does not change
B Is doubled
C Is halved
D cannot be calculated

The correct answer is:
Is doubled

Solution:
Initial temperature =127 °C=400K
Final temperature =527 °C=800K
Since KE∝T , when temperature is doubled, KE is doubled.

Topic: Chemistry, States of Matter, NEET
The temperature of an ideal gas undergoing adiabatic expansion varies with volume as T∝V-34, then the value of CPCV for the gas is

Options:
A 35

B 53

C 73

D 74

The correct answer is:
74

Solution:
Given,

T∝V-34⇒TV34=Constant

Comparing it with the relation for the adiabatic process we get

TVγ-1=TV34⇒γ-1=34⇒γ=74

Topic: Physics, Thermodynamics, NEET
The temperature of equal masses of three different liquids A, B and C are 12℃, 19℃ and 28℃ respectively. The temperature when A and B are mixed is 16℃ and when B and C are mixed is 23℃. The temperature when A and C are mixed is

Options:
A 18.2 â
B 22 â
C 20.2 â
D 24.2 â

The correct answer is:
20.2 â

Solution:
1st case A and B mixed
ms A t - t A = ms B t - t B
sA(16-12)=sB(19-16)
4sA=3sB
2nd case B and C mixed
msBt-tB=msC(tC-t)
sB23-19=sC(28-23)
4sB=5sC
3sB=154sC
∴ 4sA=3sB=154sC
⇒ 16sA=12sB=15sC=k
sA:sB:sC=116:112:115
sA=k16 , sC=k15
3rd Case When A and C are mixed
msAt-tA=msC(tC-t)
k16t-12=k15(28-t)
15t-180=448-16t
31t=628
⇒ t=20.2 ℃

Topic: Physics, Thermal Properties of Matter, NEET
The temperature of inversion of a thermocouple is $620^{\circ} \mathrm{C}$ and the neutral temperature is $300^{\circ} \mathrm{C}$. What is the temperature of cold junction?

Options:
A $320^{\circ}$
B $20^{\circ} \mathrm{C}$
C $-20^{\circ} \mathrm{C}$
D $40^{\circ} \mathrm{C}$

The correct answer is:
$-20^{\circ} \mathrm{C}$

Solution:
$T_1=20^{\circ} \mathrm{C}, T_n=300^{\circ} \mathrm{C}$
$\begin{array}{l}
T_n=\frac{T_1+T_C}{2} \\
\text {or } 600 =620+T_C \\
\Rightarrow T_C =-20^{\circ} \mathrm{C}
\end{array}$

Topic: Physics, Thermal Properties of Matter, NEET, NEET 2005
The temperature of source of a Carnot engine of efficiency 20% when the heat exhausted is at 240 K is

Options:
A 1200 K
B 600Â K
C 540Â K
D 300 K

The correct answer is:
300 K

Solution:
The efficiency of a Carnot engine is
η=1-T2T1
Where T1 and T2 are the temperature (in kelvin) of the source and the sink respectively
Here, η=20%=20100=15,
T1=?, T2=240 K
∴     15=1-240T1
Or 240T1=1-15=45
Or T1=54240=300 K

Topic: Physics, Thermodynamics, NEET
The temperature should the hydrogen at 327 Â°C be cooled at constant pressure so that the root mean square velocity of its molecules becomes half of its previous value is

Options:
A -123 °C
B 123 Â°C
C -100 Â°C
D 0 °C

The correct answer is:
-123 °C

Solution:
vrms∝3RTM
⇒ T∝vrms2
⇒ T2T1=v2v12=14 ⇒T2=T14=273+3274
=150 K=-123 ℃

Topic: Physics, Kinetic Theory of Gases, NEET
The temperatures across two different slabs A and B are of the same length and same crossectional area are at steady state (as shown in the diagram). The ratio of thermal conductivities of A and B is

Options:
A 2:3

B 3:2
C 1:1
D 5:3

The correct answer is:
3:2

Solution:
dQ dt Ã 1 A = K A 5 0 - 3 0 3 (for slab A)
= K B ( 50â20 ) 3 âââââââââ( forâslabâB ) âââââââââââ2 K A =3 K B or,âââââââ K A K B = 3 2 â

Topic: Physics, Thermal Properties of Matter, NEET
The temperatures of equal masses of three different liquids A, B and C are 12Â°C,â¡19Â°C and 28Â°C respectively. The temperature when A and B are mixed is 16Â°C and when B and C are mixed it is 23Â°C. The temperature when A and C are mixed will be

Options:
A 15 Â°C
B 18.2 Â°C
C 20.25 Â°C
D 24.5Â°C

The correct answer is:
20.25 Â°C

Solution:
when A and B are mixed
msA×16°-12°=msB×19°-16°
⇒msA×4=msB×3
⇒4sA=3sB ....(i)
when B and C are mixed
msB×23°-19°=msC×28°-23°
⇒ msB×4=msC×5
⇒4sB=5sC ....(ii)
By (i) & (ii)
16sA=15sC ....(iii)
when A and C are mixed
msAθ-12=msC28-θ ....(iv)
By (iii) & (iv)
θ=20.25 °C

Topic: Physics, Thermal Properties of Matter, NEET
The tendency of $\mathrm{BF}_3, \mathrm{BCl}_3$ and $\mathrm{BBr}_3$ to behave as Lewis acid decreases in the sequence

Options:
A $\mathrm{BCl}_3>\mathrm{BF}_3>\mathrm{BBr}_3$
B $\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3$
C $\mathrm{BBr}_3>\mathrm{BF}_3>\mathrm{BCl}_3$
D $\mathrm{BF}_3>\mathrm{BCl}_3>\mathrm{BBr}_3$

The correct answer is:
$\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3$

Solution:
As the size of halogen atom increases, the acidic strength of boron halides increases. Thus, $\mathrm{BF}_3$ is the weakest Lewis acid. This is because of the $\mathrm{p} \pi-\mathrm{p} \pi$ back bonding between the fully-filled unutilised 2 p orbitals of $\mathrm{F}$ and vacant 2 p orbitals of boron which makes $\mathrm{BF}_3$ less electron deficient. Such back donation is not possible in case of $\mathrm{BCl}_3$ or $\mathrm{BBr}_3$ due to larger energy difference between their orbitals. Thus, these are more electron deficient. Since on moving down the group the energy difference increases, the Lewis acid character also increases. Thus, the tendency to behave as Lewis acid follows the order
$$
\mathrm{BBr}_3>\mathrm{BCl}_3>\mathrm{BF}_3
$$

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET, NEET 2010 (Screening)
The tendency of the body to manifest a characteristic and unpleasant withdrawal syndrome if a regular dose of drugs/alcohol is abruptly discontinued is called as

Options:
A Habituation
B Dependence
C Psychotherapy
D Tolerance

The correct answer is:
Dependence

Solution:
Dependence is the psychological state of a drug user in which the usual or increasing doses of the drug are required to prevent the onset of the withdrawal symptoms.

Topic: Biology, Human Health and Diseases, NEET
The tension in a wire is decreased by 19 %. The percentage decrease in frequency will be

Options:
A 19 %
B 10 %
C 0.19 %
D None of these

The correct answer is:
10 %

Solution:
Frequency in transverse wave
n=12l TÎ¼
n2n1=T2T1=81100=910
â´n1-n2n1Ã100=10%

Topic: Physics, Waves and Sound, NEET
The tenth elements in the periodic table resemble with the

Options:
A First element
B Second element
C Fourth element
D Ninth element

The correct answer is:
Second element

Solution:
Tenth element(Ne) belongs to the noble gas family. Hence it resembles with second element(He) which is also a noble gas.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
The terga, sterna and pleura of cockroach body are joined by:

Options:
A Cementing glue
B Muscular tissue
C Arthrodial membrane
D Cartilage

The correct answer is:
Arthrodial membrane

Solution:
The tough, flexible cuticle between the sclerotized parts (skeletal elements) that allows relative movement is called an arthrodial membrane. The terga, sterna and pleura are chitinous plates which cover the cockroach body. These three are linked together by a thin arthrodial membrane.

Topic: Biology, Structural Organisation in Animals, NEET, NEET 2015 (Phase 1)
The term "antibiotic" was coined by:

Options:
A Edward Jenner
B Louis Pasteur
C Selman Waksman
D Alexander Fleming

The correct answer is:
Selman Waksman

Solution:
Selman Waksman who discovered streptomycin, first used the word "antibiotic". Penicillin, the first true antibiotic was discovered by Alexander Fleming. Edward Jenner discovered the vaccination for smallpox.

Topic: Biology, Human Health and Diseases, NEET, NEET 2003