datavorous/entrance-exam-dataset huggingface dataset:
A hydrocarbon C5H10does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.

Options:
A n-pentane
B Cyclohexane
C Cyclopentane
D neopentane

The correct answer is:
Cyclopentane

Solution:
Correct Option is : (C)
Cyclopentane

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
A hydrocarbon of molecular mass 72 g mol–1gives a single mono chloro derivative and two dichloro derivatives on photo chlorination. Give the IUPAC name of the hydrocarbon.

Options:
A 1,3-dimethylpropane
B 2-methylpropane
C 2,2-dimethylpropane
D 1,2-dimethylpropane

The correct answer is:
2,2-dimethylpropane

Solution:
Correct Option is : (C)
2,2-dimethylpropane

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
A hydrocarbon with formula C8H18 gives one monochloro derivative. The hydrocarbon is

Options:
A n-octane
B 2-methylheptane
C 2, 2, 4-trimethyl pentane
D 2, 2, 3, 3-tetramethyl butane

The correct answer is:
2, 2, 3, 3-tetramethyl butane

Solution:
As only one monochloro derivative is obtained all the groups must be identical

Topic: Chemistry, Hydrocarbons, NEET
A hydrogen atom in ground state absorbs 10.2 eV of energy. The orbital angular momentum of the electron is increased by

Options:
A 1.05×10–34J⁡s
B 2.11×10–34J⁡s
C 3.16×10–34J⁡s
D 4.22×10–34J⁡s

The correct answer is:
1.05×10–34J⁡s

Solution:
ΔE=E2-E1
10.2  eV=-3.4  eV+13.6  eV
This is possible only when
E2-3.4 eV and
E1=-13.6 eV
This mean n2=2 & n1=1
ΔL=2h2π-h2π=h2π=6.63×10-342×3.14J s
=1.05×10–34J⁡s

Topic: Physics, Atomic Physics, NEET
A hydrogen atom initially in the ground state absorbs a photon which excites it to n = 4 state. The frequency of the photon is

Options:
A 3.1 x 1015 Hz

B 3.1 Ã 1014 Hz
C 9.7 Ã 1015 Hz
D 9.7 × 1014 Hz

The correct answer is:
3.1 x 1015 Hz

Solution:
For ground state n1 = 1 to n2 = 4
Energy absorbed by photon, E = E2 - E1
=+13.61n12-1n22×1.6×10-19 J
=13.611-142×1.6×10-19
= 13.6 × 1.6 × 10 - 19 15 16
= 2.4 × 10-19
or E = hv = 20.4 x 10-19 J
Frequency v =20.4×10-19h
= 20.4 × 10 - 19 6.63 × 10 - 34
= 3.076 × 1015
= 3.1 × 1015 Hz

Topic: Physics, Atomic Physics, NEET
A hydrogen atom is in fifth excited state. When the electron jumps to ground state, the velocity of recoiling hydrogen atom is

Options:
A 1.1 m s-1
B 4.2 m s-1
C 8.4 m s-1
D 11.2 m s-1

The correct answer is:
4.2 m s-1

Solution:
ÎE=13.6112-162
ÎE=13.22 eV
p=ÎEc
â v=ÎEmC=13.22Ã1.6Ã10â191.67Ã10â27Ã3Ã108=4.2 m s-1

Topic: Physics, Atomic Physics, NEET
A hydrogen atom is paramagnetic. A hydrogen molecule is

Options:
A Diamagnetic
B Paramagnetic
C Ferromagnetic
D None of these

The correct answer is:
Diamagnetic

Solution:
A hydrogen molecule consisting of two hydrogen atoms. Diamagnetism can be observed in materials whose atoms are having paired electrons. There are no unpaired electron and hence it is diamagnetic in nature.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is -

Options:
A 2.75Â m/s
B 3.25 m/s
C 4.85Â m/s
D 5.65Â m/s

The correct answer is:
3.25 m/s

Solution:
Linear momentum of photon and electron are equal and opposite
p=m=hλ ;
v =hmλ=6.62×10-341.67×10-27×122×10-19
v = 3.25 m/s

Topic: Physics, Dual Nature of Matter, NEET
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of $\mathrm{pH}=10$ and by passing hydrogen gas around the platinum wire at $1 \mathrm{~atm}$ pressure. The oxidation potential of electrode would be

Options:
A $0.059 \mathrm{~V}$
B $0.59 \mathrm{~V}$
C $0.118 \mathrm{~V}$
D $1.18 \mathrm{~V}$

The correct answer is:
$0.59 \mathrm{~V}$

Solution:
For hydrogen electrode, oxidation half reaction is
$\underset{(1 \mathrm{~atm})}{\mathrm{H}_2} \longrightarrow \underset{(\text{At } \mathrm{pH~} 10)}{2 \mathrm{H}^{+}}+2 \mathrm{e}^{-}$
If $\mathrm{pH}=10$
$\mathrm{H}^{+}=1 \times 10^{-\mathrm{pH}}=1 \times 10^{-10}$
From Nernst equation,
$E_{\text {cell }}=E_{\text {cell }}^0-\frac{0.0591}{2} \log \frac{\left[\mathrm{H}^{+}\right]^2}{P_{\mathrm{H}_2}}$
For hydrogen electrode, $E_{\text {cell }}^{\circ}=0$
$\begin{aligned}
E_{\text {cell }} & =-\frac{0.0591}{2} \log \frac{\left(10^{-10}\right)^2}{1} \\
& =+\frac{0.0591 \times 2}{2} \log \frac{1}{10^{-10}} \\
& =0.0591 \log 10^{10} \\
& =0.0591 \times 10=0.591 \mathrm{~V}
\end{aligned}$

Topic: Chemistry, Electrochemistry, NEET, NEET 2013 (All India)
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be?

Options:
A 0.59 V
B 0.118 V
C 1.18 V
D 0.059 V

The correct answer is:
0.59 V

Solution:
H2→2H++2e-
Eoxil=Eoxid0-0.0592log10(H+)2PH2
=0-0.0592log10(10-10)21=0.59V

Topic: Chemistry, Electrochemistry, NEET
A hydroxyl acid on heating gives a 5- membered lactone. The acid is

Options:
A CH2OHCH2CH2COOH
B CH3CHOHCH2COOH
C CH3CH2CHOHCOOH
D CH3CHOHCHOHCOOH

The correct answer is:
CH2OHCH2CH2COOH

Solution:
The reaction is as follows

Topic: Chemistry, Aldehydes and Ketones, NEET
A hypothetical electrochemical cell is show below
$\stackrel{\Theta}{\mathrm{A}}\left|\mathrm{A}^{+}(x \mathrm{M}) \| \mathrm{B}^{+}(y \mathrm{M})\right| \stackrel{\oplus}{\mathrm{B}}$
The emf measured is $+0.20 \mathrm{~V}$. The cell reaction is:

Options:
A $\mathrm{A}+\mathrm{B}^{+} \rightarrow \mathrm{A}^{+}+\mathrm{B}$
B $\mathrm{A}^{+}+\mathrm{B} \rightarrow \mathrm{A}+\mathrm{B}^{+}$
C $\mathrm{A}^{+}+e^{-} \rightarrow \mathrm{A}$; $\mathrm{B}^{+}+e^{-} \rightarrow \mathrm{B}$
D the cell reaction cannot be predicted

The correct answer is:
$\mathrm{A}+\mathrm{B}^{+} \rightarrow \mathrm{A}^{+}+\mathrm{B}$

Solution:
$\mathrm{A} / \mathrm{A}^{+}(x \mathrm{M}) \| \mathrm{B}^{+}(y \mathrm{M}) / \mathrm{B}$
$$
\mathrm{E}_{\text {cell }}=+0.20 \mathrm{~V} \therefore \Delta \mathrm{G}=-v e
$$
Therefore given cell reaction is spontaneous
At Anode $\quad \mathrm{A} \rightarrow \mathrm{A}^{+}+e^{-}$
\begin{array}{ll} At Cathode & \mathrm{B}^{+}+e^{-} \rightarrow \mathrm{B} \\ \hline Cell reaction & \mathrm{A}+\mathrm{B}^{+} \rightarrow \mathrm{A}^{+}+\mathrm{B} \end{array}

Topic: Chemistry, Electrochemistry, NEET, NEET 2006
A hypothetical electrochemical cell is shown below
A|A+(xM)||B+(yM)|B
The emf measured is +0.20 V. The cell reaction is

Options:
A A+B+→A++B
B A++B→A+B+
C A++e-→A;B++e-→B
D the cell reaction cannot be predicated

The correct answer is:
A+B+→A++B

Solution:
From the given expression
At anode: A→A++e
At cathode: B++e→B
Overall reaction is: A+B+→A++B

Topic: Chemistry, Electrochemistry, NEET
A hypothetical electromagnetic wave is shown in Fig. 2.2. Find out the wavelength of the radiation.

Options:
A 8.64 pm
B 8.94 pm
C 7.64 pm
D 5.64 pm

The correct answer is:
8.64 pm

Solution:
Correct Option is : (A)
8.64 pm

Topic: Chemistry, Structure of Atom, NEET
A hypothetical reaction, A2+B2→2AB follows the mechanism as given below
A2⇌A+A (Fast)
A+B2→AB+B (slow)
A+B→AB (Fast)
The order of the overall reaction is

Options:
A 2
B 1
C 3/2
D 0

The correct answer is:
3/2

Solution:
r=K[A][B2]
and Kc=[A][A][A2]
or [A]=Kc1/2[A2]1/2
Thus, r=K.Kc1/2[A2]1/2[B2]
Let K.Kc1/2=K'
so r=K'[A2]1/2[B2]
Hence order is 3/2.

Topic: Chemistry, Chemical Kinetics, NEET
A(Inorganic salt)+K2Cr2O7+conc.H2SO4âÎ
Reddish brown fumes
Which is correct statement regarding above observation?

Options:
A It confirms the presence of Cl- ions
B It confirms the presence of Br- ions
C It confirms the presence of both ions
D It neither confirms the presence of Cl- , nor Br- ions unless it is passed through NaOH solution

The correct answer is:
It neither confirms the presence of Cl- , nor Br- ions unless it is passed through NaOH solution

Solution:

Topic: Chemistry, d and f Block Elements, NEET
...........A........... in sporogenous mass undergo ...........B........... to form a tetrad that on separation gives rise to .........C........ functional microspore/s.

Options:
A

A	B	C
Pollen mother cell	Meiosis	4

B

A	B	C
Pollen mother cell	Meiosis	1

C

A	B	C
Megaspore Mother Cell	Meiosis	4

D

A	B	C
Megaspore Mother cell	Meiosis	1

The correct answer is:

A	B	C
Pollen mother cell	Meiosis	4

Solution:
Microsporogenesis
Sporogenous tissue: It is the group of compactly arranged homogenous cells in the centre of each
microsporangium in a young anther.
Each cell of sporogenous tissue act as Pollen mother cell PMC/2n --- (Meiosis/Process :
Microsporogenesis) → Microspore tetrad -----(When anthers mature and dehydrate)---- → 4
Microspores [Each haploid (n)] are released → Each microspore develop into a pollen grain ----
-(Dehiscence)---- → Thousands of pollen grains come out of anther.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
A jar of height h is filled with a transparent liquid of refractive index µ (Fig. 9.6). At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible.

Options:
A $\frac{h}{\sqrt{{{\mu }^{2}}-1}}$
B $\frac{2h}{\sqrt{{{\mu }^{2}}-1}}$
C $\frac{2h}{\sqrt{2{{\mu }^{2}}-1}}$
D $\frac{h}{\sqrt{2{{\mu }^{2}}-1}}$

The correct answer is:
$\frac{2h}{\sqrt{{{\mu }^{2}}-1}}$

Solution:
Correct Option is : (B)
$\frac{2h}{\sqrt{{{\mu }^{2}}-1}}$

Topic: Chemistry, Ray Optics, NEET
A jawless fish, which lays eggs in freshwater and whose larvae after metamorphosis return to the ocean is

Options:
A Rohu
B Neomyxine
C Petromyzon
D Eptatretus

The correct answer is:
Petromyzon

Solution:
Petromyzon (Lamprey) is a migratory marine water jawless fish which shows anadromous migration. It spawns in freshwater, stops feeding and dies. Its larva (ammocoetes) after metamorphosis will return to the ocean.

Topic: Biology, Animal Kingdom, NEET, NEET 2015 (Phase 2)
A jawless fish, which lays eggs in freshwater and whose larvae after metamorphosis return to the ocean is

Options:
A Rohu
B Neomyxine
C Petromyzon
D Eptatretus

The correct answer is:
Petromyzon

Solution:
Petromyzon (Lamprey) is a migratory marine water jawless fish which shows anadromous migration. It spawns in freshwater, stops feeding and dies. Its larva (ammocoetes) after metamorphosis will return to the ocean.

Topic: Biology, Animal Kingdom, NEET
A jet plane having a wing-span of 25 m is travelling horizontally towards East with a speed of 3600 km/hr. If the Earth's magnetic field at the location is 4Ã10-4 T and the angle of dip is 30o , then the potential difference between the ends of the wing is

Options:
A 4Â V
B 5 V
C 2Â V
D 2.5Â V

The correct answer is:
5 V

Solution:
Given, B=4Ã10-4T, l=25m,
v=3600 km/h=1000 m/s, Î¸=30o
E=B lvsinâ¡Î¸
=4Ã 10 â4 Ã25Ã1000Ãsinââ30Â°=5âV

Topic: Physics, Magnetic Effects of Current, NEET
A jogger running at 9 km h-1 alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 km h-1 in the same direction. In how much time will the train pass the jogger?

Options:
A 3.6 s

B 18 s
C 36 s
D 72 s

The correct answer is:
36 s

Solution:
Speed of train relative to jogger = 45 – 9 km h-1 = 36 km h-1
= 36×518 m s-1= 10 m s-1
Distance to be covered = (240 + 120) m = 360 m .
∴ Time taken = 36010 s = 36 s .

Topic: Physics, Motion In One Dimension, NEET
A juggler throws balls into the air. He throws one whenever the previous one is at its highest point. If the throws n balls each second, the height to which each ball will rise is

Options:
A g2n2
B 2gn2
C 2gn
D g4n2

The correct answer is:
g2n2

Solution:
Time taken by each ball to reach highest point,
t=1n s.
As the juggler throws the second ball, when the first ball is at its highest point, so v=0
Using v=u+at, we have 0 = u⁡ + - g⁡ 1 / n⁡
or u⁡ = g⁡ / n⁡
Also v2=u2+2as
∴ or h=g2n2.

Topic: Physics, Motion In One Dimension, NEET
A knocking sound is produced in the engine when the fuel

Options:
A burns fast
B burns slowly
C is contaminated with lubricating oil
D contains some water

The correct answer is:
burns fast

Solution:
In fast burning total fuel is not burnt and unburnt fuel produces knocking.

Topic: Chemistry, Electrochemistry, NEET
Al3+ has low ionic radius than Mg2+ because

Options:
A Al3+ has high nuclear charge than Mg2+
B Mg atom has less no. of neutrons than Al atom
C Mg and Al differ in electronegativity values
D Al atom has low IE value than Mg atom

The correct answer is:
Al3+ has high nuclear charge than Mg2+

Solution:
Atomic radius is inversely proportional to nuclear attraction. Al3+ has high nuclear charge than Mg2+therefore Al3+ has low ionic radius than Mg2+

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
AlCl3 fumes in air because of

Options:
A hydrolysis
B dehydration
C hydration
D oxidation

The correct answer is:
hydrolysis

Solution:
It undergoes hydrolysis and gives fumes of HCl
AlCl3+3HOH→Al(OH)3+3HCl

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
A L shaped rod of mass M is free to rotate in a vertical plane about axis AA′ as shown in figure. Maximum angular acceleration of rod is

Options:
A 3g10l
B 9g10l
C 9g5l
D 6g52l

The correct answer is:
3g10l

Solution:
Moment of inertia about axis AA' is
IAA'=M2l212+M25l24+M2l23
â´ OD=5l2
OC=10l4 ( point C is centre of mass of the system )
Torque of Mg will be maximum when OC is horizontal
â´ Î±=ÏIAA'=Mg10l45Ml26
Î±=3g10l

Topic: Physics, Rotational Motion, NEET
A lake near a village suffered heavy mortality of fishes within a few days. Which of the following can be the reason for this?

(a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
(b) The area was sprayed with DDT by an aircraft.
(c) The lake water turned green and stinky.
(d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis.

Options:
A b and c
B c and d
C a and c
D a and b

The correct answer is:
a and c

Solution:
Lots of urea and phosphate fertilizer were used in the crops in the vicinity and the lake water turned green and stinky. Due to this, the lake near a village suffered heavy mortality of fishes within a few days.

Topic: Biology, Environmental Issues, NEET
A lake which is rich in organic waste may result in

Options:
A Increased population of aquatic organisms due to minerals
B Drying of the lake due to algal bloom
C Increased population of fish due to lots of nutrients
D Mortality of fish due to lack of oxygen

The correct answer is:
Mortality of fish due to lack of oxygen

Solution:
Micro-organisms involved in biodegradation of organic matter consume lot of oxygen, oxygen as a result there is a sharp decline in dissolved oxygen in water that causes mortality of fish and other aquatic creatures.

Topic: Biology, Environmental Issues, NEET, NEET 2016 (Phase 2)
A lake with an inflow of domestic sewage rich in organic waste may result in

Options:
A

drying of the lake very soon due to algal bloom

B

an increased production of fish due to lot of nutrients

C

death of fish due to lack of oxygen

D

increased complexity of the aquatic food web

The correct answer is:

death of fish due to lack of oxygen

Solution:
A lake rich in (domestic sewage) nutrients accelerates the growth of algae which use oxygen at night and deoxygenate the water enough to kill the fish and other animals (eutrophication).

Topic: Biology, Environmental Issues, NEET
A lake with an inflow of domestic sewage rich in organic waste may result in

Options:
A Drying of the lake very soon to algal bloom.
B An increased production of fish due to lot of nutrients.
C Death of fish due to lack of oxygen.
D Increased population of aquatic food web organism.

The correct answer is:
Death of fish due to lack of oxygen.

Solution:
Algal blooms are the result of a nutrient, like nitrogen or phosphorus from fertilizer runoff, entering the aquatic system and causing excessive growth of algae. An algal bloom affects the whole ecosystem. Consequences range from the benign feeding of higher trophic levels, to more harmful effects like blocking sunlight from reaching other organisms, causing a depletion of oxygen levels in the water, and, depending on the organism, secreting toxins into the water. The process of the oversupply of nutrients leading to algae growth and oxygen depletion is called eutrophication.

Topic: Biology, Environmental Issues, NEET
A large box is moving on a horizontal floor with constant acceleration a=g. A particle is projected inside the box with velocity u and angle Î¸ with horizontal from box frame. For the given u the value of Î¸ for which horizontal range inside the box will be maximum is

Options:
A π4
B π8
C 3π8
D π3

The correct answer is:
π8

Solution:
T= 2u sinθg
R= u2 sin2θg–2u2 sin2θg
R will be maximum when dRdθ=0
⇒ 2 u 2 g cos2θ− 2 u 2 g .2sinθ cosθ=0
⇒2cos2θ=4sinθcosθ
⇒cos2θ=sin2θ
⇒2θ= π 4
⇒θ=π8

Topic: Physics, Motion In Two Dimensions, NEET
A large number of bullets are fired in all directions with the same speed v. What is the maximum area on the ground on which these bullets will spread?

Options:
A πv2g
B πv4g2
C π2v4g2
D π2v2g2

The correct answer is:
πv4g2

Solution:
The area in which bullet will spread =πr2
For maximum range, Rmax=v2g [when θ=45°]
∴ Maximum area =πRmax2=πv2g2=πv4g2

Topic: Physics, Motion In Two Dimensions, NEET
A large number of liquid drops each of radius r coalesce to from a single drop of radius R. The energy released in the process is converted into kinetic energy of the big drop so formed. The speed of the big drop is (given, surface tension of liquid T, density ρ)

Options:
A Tρ1r-1R
B 2Tρ1r-1R
C 4Tρ1r-1R
D 6Tρ1r-1R

The correct answer is:
6Tρ1r-1R

Solution:
n43Ïr3=43ÏR3
n=R3r3
ÎU=nÂ 4Ïr2Â T-4ÏR2Â T
=4ÏTÂ nr2-R2
=4ÏTÂ R3r2r3-R2
â´ Energy released,
U=4ÏT R 3 [ 1 r â 1 R ]
If this energy is converted into kinetic energy then
1 2 m v 2 =4Ï R 3 T[ 1 r â 1 R ]
1 2 Ã[ 4 3 Ï R 3 Ï ] v 2 =4Ï R 3 T[ 1 r â 1 R ]
v= 6T Ï [ 1 r â 1 R ]

Topic: Physics, Mechanical Properties of Fluids, NEET
A large number of proteins made by the ribosomes get modified in

Options:
A Lysosomes.
B Trans face of Golgi apparatus.
C Cisternae of Golgi apparatus.
D Smooth endoplasmic reticulum.

The correct answer is:
Cisternae of Golgi apparatus.

Solution:
Camillo Golgi first explained Golgi apparatus. These are of various shape like flat, disc shaped sacs or cisternae. The golgi bodies are arranged with covex cis which is the forming face and concave trans which is the maturing face. The cis and trans are interconnected with each other. Large number of proteins made by the ribosomes get modified in Cisternae of golgi apparatus.

Topic: Biology, Cell - The Unit of Life, NEET
A large parallel plate capacitor, whose plates have an area of 1 m2 and are separated from each other by 1 mm, is being charged at a rate of 25 V s-1. If the dielectric between the plates has the dielectric constant 10, then the displacement current at this instant is

Options:
A 25Â Î¼A
B 11Â Î¼A
C 2.2 Î¼A
D 1.1Â Î¼A

The correct answer is:
2.2 Î¼A

Solution:
C=Îµ0KAd=(8.85Ã10-12)Ã10Ã110-3
=8.85Ã10-8 F
i=ddtCV=CdVdt=8.85Ã10-8Ã25
=2.2Ã10-6 A

Topic: Physics, Semiconductors, NEET
A large persistent cotyledon in the embryo of the wheat grain is called:

Options:
A Coleorhiza
B Scutellum
C Coleoptile
D Epiblast

The correct answer is:
Scutellum

Solution:
The scutellum is a component of the structure of barley, rice, maize and wheat seed, that is a modified seed leaf and it can also refer to the equivalent of a thin cotyledon in monocot. Although it is a very thin structure but it has a higher surface area and it serves to absorb nutrients from the endosperm during germination. An unidentified protein transporter is present in scutellum which is believed to facilitate starch movement from endosperm to the embryo.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2015 (Phase 2)
A large persistent cotyledon in the embryo of the wheat grain is called

Options:
A Coleorhiza
B Scutellum
C Coleoptile
D Epiblast

The correct answer is:
Scutellum

Solution:
The scutellum is the large persistent cotyledon in the embryo of wheat grain.

Topic: Biology, Morphology of Flowering Plants, NEET
A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This $\mathrm{O}_2$

Options:
A raises the $p_{\mathrm{CO}_2}$ of blood to $75 \mathrm{~mm}$ of $\mathrm{Hg}$
B is enough to keep oxyhaemoglobin
C helps in relasing more $\mathrm{O}_2$ to the epithelial tissues
D acts as a reserve during muscular exercise

The correct answer is:
acts as a reserve during muscular exercise

Solution:
Our tissue are able to utilize only $25 \%$ of $\mathrm{O}_2$ carried by arterial blood. The venous blood is still $75 \%$ saturated with $\mathrm{O}_2$. This $\mathrm{O}_2$ acts as a reserve during muscular exercise.

Topic: Biology, Breathing and Exchange of Gases, NEET, NEET 2011 (Screening)
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. What is the fate of this O2?

Options:
A It raises the pCO2 of blood to 75 mm of Hg.
B It is enough to keep oxyhaemoglobin.
C It helps in releasing more O2 to the epithelial tissues.
D It acts as a reserve during muscular exercises.

The correct answer is:
It acts as a reserve during muscular exercises.

Solution:
Tissue are able to utilize only 25% of O2 carried by arterial blood. The venous blood is still 75% saturated with O2. This O2 acts as a reserve during muscular exercise.

Topic: Biology, Breathing and Exchange of Gases, NEET
A large quantity of monoclonal antibodies are produced from

Options:
A B-Cells
B Myeloma cells
C Hybridoma cells
D T-Lymphocytes

The correct answer is:
Hybridoma cells

Solution:
For monoclonal antibody production, Kohler and Milstein developed hybridoma technology in which a myeloma tumour cell was fused with an antibody producing B- Lymphocyte. The hybrid cell thus produced was named as hybridoma cell. It inherited the antibody-producing nature from lymphocytes and the dividing capability from the tumour cell.

Topic: Biology, Human Health and Diseases, NEET
A large white flower which blooms in the night having a scent of rotting fruit and producing a copious amount of nectar is most likely to be pollinated by

Options:
A insects
B birds
C snakes
D bats

The correct answer is:
bats

Solution:
Pollination bats are called Chiropterophily. Chiropterophilous flowers are large, dull or white-colored, bloom in the evening or night have rotting fruit smell to attract bats, and have a large amount of nectar. Examples: Adansonia, Bauhinia, etc.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
A laser beam is sent to the moon and reflected back to earth by a mirror placed on the moon by an astronaut. If the moon is at 3,84,000 km distance from earth, how long does it take the light to make the round trip?

Options:
A 5 min
B 2.5 min
C 2.5 s
D 500 s

The correct answer is:
2.5 s

Solution:
Given:
The distance of the moon ( s )=384000âkm
=384000Ã 10 3 âm
We known speed of light ( c )=3Ã 10 8 âm/s
Total time taken by the laser beam to make the round trip is
t=2sc=2Ã384000Ã10003Ã108=2.5 s

Topic: Physics, Electromagnetic Waves, NEET
A laser light of wavelength 660ânm is used to weld Retina detachment. If a laser pulse of width 60âms and power 0.5 kW is used, the approximate number of photons in the pulse are (Take Planck's Constant, h=6.62Ã 10 â34 âJ s)

Options:
A 1022
B 1019
C 1020
D 1018

The correct answer is:
1020

Solution:
Power P is given as ,
P=nhcÎ»t , n=PÎ»thc
=0.5Ã103Ã660Ã10-9Ã60Ã10-36.6Ã10-34Ã3Ã108
=100Ã1018=1020

Topic: Physics, Atomic Physics, NEET
A layer of 0.25 mm thick chromium metal is to be electroplated on the rims of autovehicle with a total area of 32 m2 from a solution of CrO42- . What amount of electric current is required for electroplating the rims in 60 sec? The density of chromium metal is 7.2 g/cc.

Options:
A 4.9Ã103 A
B 1.78Ã103 A
C 5.3Ã104 A
D 10.69Ã106 A

The correct answer is:
10.69Ã106 A

Solution:
Volume of coated lay = Area Ã thickness
=32Ã104Ã0.025
=8000 cm3
Mass of chromium deposited = volume Ã density
=8000Ã7.2
=57600 g
W=ItE96500
57600=IÃ60Ã(52/6)96500
I=10.69Ã106 amp.

Topic: Chemistry, Electrochemistry, NEET