Official NTA NEET-UG 2019 question paper, set R3. 180 questions across Physics, Chemistry, and Biology with worked solutions and the official answer key.
The displacement of a particle executing simple harmonic motion is given by y = 𝐴0 + A sinwt + B coswt Then the amplitude of its oscillation is given by :
A + B
𝐴0 + √𝐴2 + 𝐵2
√𝐴2 + 𝐵2
√𝐴0 2 +(𝐴 + 𝐵)2
In which of the following device the eddy current effect is not used?
electric heater
induction furnace
magnetic braking in train
electromagnet
Average velocity of a particle executing SHM in one simple vibration is :
zero
𝐴ω 2
𝐴ω
𝐴ω2 2
The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t north is given by
45° west
30° west
0°
60° west
In the circuits shown below, the readings of the voltmeters and the ammeters will be:
𝑉2> 𝑉1 and 𝑖1 > 𝑖2
𝑉2> 𝑉1 and 𝑖1=𝑖2
𝑉1= 𝑉2 and 𝑖1>𝑖2
𝑉1= 𝑉2 and 𝑖1=𝑖2
A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is ( 𝑎𝐶𝑢= 1.7 × 10—5 𝐾—1 and 𝑎𝐴𝑙= 2.2 × 10—5 𝐾—1)
68 cm
6.8 cm
113.9 cm
88 cm
The unit of thermal conductivity is :
W 𝑚—1 𝐾—1
J m 𝐾—1
J 𝑚—1 𝐾—1
Wm 𝐾—1 N E W S 2 vm/s 10 m/s θ 10Ω i1 V1 V1 10V 10Ω i2 A2 V2 10V 10Ω 2 SPACE FOR ROUGH WORK
For p-type semiconductor, which of the following statements is true?
Electrons are the majority carries and pentavalent atoms are the dopants
Electrons are the majority carries and trivalent atoms are the dopants
Holes are the majority carri es and trivalent atoms are the dopants
Holes are the majority carries and pentavalent atoms are the dopants
A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distance d from the centre of the conductor, is correctly represented by figure.
(Image option — will be added soon) (1)
(Image option — will be added soon) (2)
(Image option — will be added soon) (3)
(Image option — will be added soon) (4)
Body A of mass 4 m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is:
5 9
1 9
8 9
4 9
The correct Boolean operation represented by the circuit diagram drawn is:
NOR
AND
OR
NAND
The candidates will write the Correct Test Booklet Code as given in the Test Booklet / Answer Sheet in the Attendance Sheet. 1 TIME : 3 HRS DATE : 05-5-2019 NEET (UG) – 2019 SET- R3 SPACE FOR ROUGH WORK 1. The displacement of a particle executing simple harmonic motion is given by y = 𝐴0 + A sinwt + B coswt Then the amplitude of its oscillation is given by :
A + B
𝐴0 + √𝐴2 + 𝐵2
√𝐴2 + 𝐵2
√𝐴0 2 +(𝐴 + 𝐵)2
The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth is:
3 2 mgR
mgR
2mgR
1 2 mgR
The total energy of an electron in an atom in an orbit is – 3.4 eV. Its kinetic and potential energies are, respectively :
4 eV, 3.4 eV
– 3.4 eV, –3.4 eV
– 3.4 eV, –6.8 eV
4 eV, –6.8 eV
In which of the following process heat is neither absorbed nor released by a system?
isochoric
isothermal
adiabatic
isobaric
A hollow metal sphere of radius R is u niformly charged. The electric field due to the sphere at a distance r from the centre x1 v 60° = θ1 x2 v 30° = θ2 V1 V2 h = R m 4 SPACE FOR ROUGH WORK
decreases as r increases for 𝑟<𝑅 and for 𝑟> 𝑅
increases as r increases for 𝑟<𝑅 and for 𝑟>𝑅
zero as r increases for 𝑟<𝑅, decreases as r increase for 𝑟>𝑅
zero as r increases for 𝑟<𝑅, increases as r increases for 𝑟>𝑅
Pick the wrong answer in the context with rainbow,
Rainbow is combined effect of dispersion, refraction and reflection of sunlight.
When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
The order of colours is reversed in the secondary rainbow.
An observer can see a rainbow when his front is towards the sun.
A small hole of area of cross -section 2𝑚𝑚2 is present near the bottom of a fully filled open tank of height 2 m. Taking 𝑔=10 𝑚/𝑠2, the rate of flow of water through the open hole would be nearly:
6.4×10−6 𝑚3/𝑠
12.6×10−6 𝑚3/𝑠
8.9×10−6 𝑚3/𝑠
23×10−6 𝑚3/𝑠
Which of the following acts as a circuit protection device?
fuse
conductor
inductor
switch
Two point charge A and B, having charges +𝑄 and −𝑄 respectively is placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B then force between the charges becomes:
4𝐹 3
𝐹
9𝐹 16
16𝐹 9
Which colour of the light has the longest wavelength?
violet
red
blue
green
The radius of the circle, the period of revolution, initial position, and sense of revolution are indicated in the figure. The y-projection of the radius vector of the rotating particle P is:
| \( q_1 = \frac{3Q}{4} \) | \( q_2 = \frac{3Q}{4} \) |
| 3 m | |
| y | x |
| T = 4 s | P(t = 0) |
y-projection of the radius vector of rotating particle P is:
𝑦(𝑡)= 3cos( π𝑡 2), where y in m
𝑦 (𝑡)= −3cos2π𝑡, where y in m
𝑦 (𝑡)=4sin(π𝑡 2), where y in m
𝑦 (𝑡)=3cos( 3π𝑡 2), where y in m
α- particle consists of:
2 protons only
2 protons and 2 neutrons only
2 electrons, 2 protons and 2 neutrons
2 electrons and 4 protons only
A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2π revolution is:
2×106 𝑁 𝑚
2×10−6 𝑁 𝑚
2×10−3 𝑁 𝑚
12×10−4 𝑁𝑚
In a double slit experiment, when light of wavelength 400 nm was used. The angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2 °. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater=4/3)
0.1°
0.266°
0.15°
0.05°
At a point A on the earth’s surface the angle of dip, 𝛿=+25°. At a point B on the earth’s surface the angle of dip, 𝛿= −25°. We can interpret that:
A and B are both located in the southern hemisphere.
A and B are both located in the northern hemisphere.
A is located in the southern hemisphere and B is located in the northern hemisphere.
A is located in the northern hemisphere and B is located in the southern hemisphere.
A force 𝐹=20+10𝑦 acts on a particle in y- direction where F is in newton and y in meter. Work done by this force to move the particle from 𝑦=0 to 𝑦=1 𝑚 is:
20 J
30 J
5 J
25 J
When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (𝐿+𝑙). The elastic potential energy stored in the extended wire is:
1 2 MgL
Mgl
MgL
1 2 Mgl
A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:
zero, zero
zero, 60 μA
60 μA, 60 μA
60 μA, zero
A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:
inclined at an angle of 60° from vertical
the mass is at the highest point
the wire is horizontal
the mass is at the lowest point
Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The rate of power consumption by the bulbs when (i) all are gl owing and (ii) in the situation when two from section A and one from section B are glowing will be :
2 :1
4 : 9
9 : 4
1 : 2
In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?
90°
180°
0°
Equal to angle of incidence
Two similar thin equi -convex lens of focal length each are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lens is filled with glycerin (which has the same refractive index ( μ = 1.5) index as that of glass) then the equivalent focal length is F 2. The ratio F 1 : F2 will be
3 : 1
2 : 1
1 : 2
2 : 3
Ionized hydrogen atoms and α-particles with same momenta enters perpendicular to a constant magnetic field B. the ratio of their radii of their paths rH : rα will be
1 : 4
2 : 1
1: 2
4 : 1
In an ex periment the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where X = 𝐴2𝐵1/2 𝐶1/3𝐷3 will be:
10%
( 3 13)%
16%
−10%
A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1m. The coefficient of friction between the b lock and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary whose the cylinder is vertical and rotating about its axis, will be (g = 10 m/s2)
10 = rad/s
√10 = rad/s
10 2𝑣 rad/s
10 rad/s
A 800 turns rod of effective area 0.05 m 2 is kept perpendicular to a magnetic field 5 × 10−5 T. When the plane of the coil is rotated at 90° around any of its coplanar axis is 0.1 s. The emf induced in the coil will be:
0.02 V
2 V
0.2 V
2 × 10−3 V
Two particles A and B are moving in uniform circular motion in concentric circles of radii r A and r B with equal speed v A and v B respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be :
1 : 1
rA : rB
vA : vB
rB : rA
A soap bubble having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10−2 N/m. The pressure inside the bubble equals at a point Z 0 below the free surface of water in a container. Taking g = 10 m/s 2 density of water = 103 kg/m3, the value of Z0 is :
0.5 cm
100 cm
10 cm
1 cm
A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the center of the earth?
100 N
150 N
200 N
250 N
An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : (me = 9 × 10−31 Kg)
12.2 nm
12.2 × 10−13 m
12.2 × 10−12 m
12.2 × 10−4 nm
Two parallel infinite line charge with linear charge densities +λ C/m and −λ C/m are placed at a distance of 2R in free space. What is the electric field midway between the two line charge?
C / NR02πε λ
Zero
C / NR0 2 πε λ
C / NR0πε λ
Increase in temperature of a gas filled in a container would lead to :
Decrease in intermolecular distance
Increase in its mass
Increase in its kinetic energy
Decrease in its pressure
A particle moving with velocity 𝑣⃗ is acted by three force shown by the vector triangle PQR. The velocity of the particle will :
Change according to the smallest force 𝑄𝑅→
Increase + + + + λ −λ P Q R 9 SPACE FOR ROUGH WORK
Decrease
Remain constant
A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?
1 J
3 J
30 kJ
2 J
For the cell reaction 2𝐹𝑒3+(𝑎𝑞)+2𝐼−(𝑎𝑞)→2𝐹𝑒2(𝑎𝑞)+𝐼2(𝑎𝑞) 𝐸𝑐𝑒𝑙𝑙 ⊖ =0.24 𝑉 at 298 K. The standard Gibbs energy (Δ𝑟 °𝐺⊖) of the cell reaction is:
23.16 kJ mol−1
–46.32 kJ mol−1
–23.16 kJ mol−1
46.32 kJ mol−1
The compound that is most difficult to protonate is:
(Image option — will be added soon) (1)
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(Image option — will be added soon) (4)
The manganate and permanganate ions are tetrahedral due to
The π-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganes
Then π-bonding involves overlap of p - orbitals of oxygen with d -orbitals of manganese
There is no π-bonding
The π-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese
The correct order of the basic strength of methyl substituted amines in aqueous solution is:
𝐶𝐻3𝑁𝐻2>(𝐶𝐻3)2𝑁𝐻>(𝐶𝐻3)3𝑁
(𝐶𝐻3)2𝑁𝐻>𝐶𝐻3𝑁𝐻2>(𝐶𝐻3)3𝑁
(𝐶𝐻3)3𝑁>𝐶𝐻3𝑁𝐻2>(𝐶𝐻3)2𝑁𝐻
(𝐶𝐻3)3𝑁>(𝐶𝐻3)2𝑁𝐻>𝐶𝐻3𝑁𝐻2
An alkene “A” on reaction with 𝑂3 and Zn – 𝐻2𝑂 gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is:
H3C−CH | Cl − CH3 | CH | CH3
Cl−CH2−CH2− CH3 | CH | CH3
H3C−CH2− CH2Cl | CH−CH3
H3C−CH2− CH3 | C−CH3 | Cl
For the second period elements the correct increasing order of first ionisation enthalpy is:
Li < Be < B < C < O < N < F < Ne
Li < Be < B < C < N < O < F < Ne
Li < B < Be < C < O < N < F < Ne
Li < B < Be < C < N < O < F < Ne
A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:
Z < 1 and repulsive forces are dominant
Z > 1 and attractive forces are dominant
Z > 1 and repulsive forces are dominant
Z < 1 and attractive forces are dominant
For a cell involving one electron 𝐸cell ⊖ =0.59 V at 298 K, the equilibrium constant for the cell reaction is: [Given that 2.303 RT F =0.059 V at T=298 K]
0 × 1030
0 × 102
0 × 105
0 × 1010
Which will make basic buffer?
100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH
50 mL of 0.1 M NaOH + 25 mL of 0.1 M
100 mL of 0.1 M CH3COOH+100mL of 0.1 M
100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH
Which is the correct thermal stability order for 𝐻2𝐸 (E = O, S, Se, Te and Po)
𝐻2𝑆𝑒<𝐻2𝑇𝑒<𝐻2𝑃𝑜<𝐻2𝑂<𝐻2𝑆
𝐻2𝑆<𝐻2𝑂<𝐻2𝑆𝑒<𝐻2𝑇𝑒<𝐻2𝑃𝑜
𝐻2𝑂<𝐻2𝑆<𝐻2𝑆𝑒<𝐻2𝑇𝑒<𝐻2𝑃𝑜
𝐻2𝑃𝑜<𝐻2𝑇𝑒<𝐻2𝑆𝑒<𝐻2𝑆<𝐻2𝑂
For an ideal solution, the correct option is
Δmix𝐺=0 at constant T and P
Δmix𝑆=0 at constant T and P
Δmix𝑉≠0 at constant T and P
Δmix𝐻=0 at constant T and P
The biodegradable polymer is:
Buna-S
nylon-6, 6
nylon 2-nylon 6
nylon-6
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor M is:
Sr
Be
Mg
Ca
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
t = 2.303/k
t = 0.693/k
t = 6.909/k
t = 4.606/k
Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?
𝐵𝑒2
𝑂2
N2
𝐶2
pH of a saturated solution of Ca (𝑂𝐻)2 is 9. The solubility product (𝐾𝑠𝑝) of 𝐶𝑎(𝑂𝐻)2 is:
0.5 × 10−10
0.5 × 10−15 11 SPACE FOR ROUGH WORK
0.25 × 10−10
0.125 × 10−15
The mixture that forms maximum boiling azeotrope is:
Heptane + octane
Water + Nitric acid
Ethanol + Water
Acetone + Carbon disulphide
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:
5f > 6p > 4d > 5p
5f > 6 p > 5p > 4d
6p > 5f > 5p > 4d
6p > 5f > 4d > 5p
Which of the following is an amphoteric hydroxide?
𝐵𝑒(𝑂𝐻)2
𝑆𝑟(𝑂𝐻)2
𝐶𝑎(𝑂𝐻)2
𝑀𝑔(𝑂𝐻)2
Which of the following is incorrect statement?
𝑆𝑛𝐹4 is ionic in nature
𝑃𝑏𝐹4 is covalent in nature
𝑆𝑖𝐶𝑙4 is easily hydrolysed
𝐺𝑒𝑋4 (X = F, Cl, Br, I) is more stable than 𝐺𝑒𝑋2
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is: [Given that 1 L bar = 100 J]
30 J
–30 J
5 kJ
25 J
The number of sigma ( σ) and pi ( π) bonds in pent-2-en-4-yne is:
13 σ bonds and no π bond
10 σ bonds and 3π bond
8 σ bonds and 5π bond
11 σ bonds and 2π bond
Match the Xenon compounds in Column-I with its structure in Column -II and assign the correct code:
| Column - I | Column - II |
| (a) 𝑋𝑒𝐹4 | (i) pyramidal |
| (b) 𝑋𝑒𝐹6 | (ii) square planar |
| (c) 𝑋𝑒𝑂𝐹4 | (iii) distorted octahedral |
| (d) 𝑋𝑒𝑂3 | (iv) square pyramidal Code: |
(iii) (iv) (i) (ii )
(i) (ii) (iii) (iv)
(ii) (iii) (iv) (i)
(ii) (iii) (i) (iv)
In which case change in entropy is negative?
2H(g) → H2(g)
Evaporation of water
Expansion of gas at constant temperature
Sublimation of solid to gas
The most suitable reagent for the following conversion is:
Hg2+/H+, H2O
Na/liquid NH3
H2,Pd/C, quinoline
Zn/HCl
The major product of the following reaction is:
(Image option — will be added soon) (1)
(Image option — will be added soon) (2)
(Image option — will be added soon) (3)
(Image option — will be added soon) (4)
Match the following:
| Column - I | Column - II |
| (a) Pure nitrogen | (i) Chlorine |
| (b) Haber process | (ii) Sulphuric acid |
| (c) Contact process | (iii) Ammonia |
| (d) Deacon’s process | (iv) Sodium azide or Barium azide |
Which of the following is the correct option?
(iv) (iii) (ii) (i)
(i) (ii) (iii) (iv)
(ii) (iv) (i) (iii)
(iii) (iv) (ii) (i)
Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?
Brackett series
Lyman series
Balmer series
Paschen series
Among the following, the narrow spectrum antibiotic is:
chloramphenicol
penicillin G
ampicillin
amoxycillin
Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I− sol.?
50 mL of 0.1 M AgNO3+50 mL of 0.1 M Kl
50 mL of 1 M AgNO3+50 mL of 1.5 M Kl
50 mL of 1 M AgNO3+50 mL of 2 M Kl
50 mL of 2 M AgNO3+50 mL of 1.5 M Kl
Among the following, the reaction that proceeds through an electrophilic substitution, is
(Image option — will be added soon) (1)
(Image option — will be added soon) (2)
13 SPACE FOR ROUGH WORK
(Image option — will be added soon) (4)
The structure of intermediate A in the following reaction is:
(Image option — will be added soon) (1)
(Image option — will be added soon) (2)
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(Image option — will be added soon) (4)
What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory
e4𝑡2 2
𝑡2𝑔 4 𝑒𝑔2
𝑡2𝑔 6 𝑒𝑔0
𝑒3𝑡2 3
Among the following the one that is not a green house gas is
sulphur dioxide
nitrous oxide
methane
ozone
Identify the incorrect statement related to PCl 5 from the following:
PCl5 molecule is non reactive
Three equatorial P – Cl bond make an angle of 120° with each other
Two axial P –Cl bonds make an angle of 180 ° with each other
Axial P –Cl bond are longer than equatorial P –Cl bonds
Which one is malachite from the following?
CuCO3.Cu(OH)2
CuFeS2
Cu(OH)2
Fe3O4
Which of the following species is not stable?
[SiCl6]2–
[SiF6]2–
[GeCl6]2–
Sn(OH)6]2–
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:
C4A3
C2A3
C3A2
C3A4
The correct structure of tribromooctaoxide is: 14 SPACE FOR ROUGH WORK
(Image option — will be added soon) (1)
(Image option — will be added soon) (2)
(Image option — will be added soon) (3)
(Image option — will be added soon) (4)
The method used to remove temporary hardness of water is:
Synthetic resins method
Calgon’s method
Clark’s method
Ion-exchange method
The non -essential amino acid among the following is:
lysine
valine
leucine
alanine
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is:
40
10
20
30
Which of the following reactions are disproportionation reaction? (a) 2Cu+ → Cu2+ + Cu0 (b) 3MnO4 2−+ 4H+→ 2MnO4 − + MnO2 + 2H2O (c) 2KMnO4 Δ → K2MnO4 + MnO2 + O2 (d) 2MnO4 − + 3Mn2+ + 2H2O → 5MnO2 + 4H+ Select the correct option from the following:
(a) and (d) only
(a) and (b) only
(a), (b) and (c)
(a), (c) and (d)
For the chemical reactiona N2(g) + 3H2(g) ⇌ 2NH3(g) The correct option is
3 d[H2] dt = + d[NH3] dt
– 1 3 d[H2] dt = – 1 2 d[NH3] dt
– d[N2] dt = 2 d[NH3] dt
– d[N2] dt = 1 2 d[NH3] dt
Conjugate base for Bronsted acids H2O and HF are
H3O+ and H2F+, respectively
OH– and H2F+, respectively
H3O+ and F–, respectively
OH– and F–, respectively
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:
Tyloses in vessels
Closure of stomata
Flaccidity of Bulliform cells
Shrinkage of air spaces in spongy mesophyll
What triggers activation of protoxin to active Bt Toxin of Bacillus Thuringowa’s in boll worm?
Acidic pH of stomach
Body temperature
Moist surface of midgut
Alkaline pH of gut
Select the correctly written scientific name of mango which was first described by Carolus Linnaeus:
Mangifera Indica
Mangifera indica Car. Linn
Mangifera indica Linn.
Mangifera indica
Cells in G0 Phase:
Terminate the cell cycle
Exit the cells cycle
enter the cell cycle
Suspend the cell cycle
Phloem in gymnosperms lacks:
Both sieve tubes and companion cells
Albuminous cells and sieve cells
Sieve tubes only
Companion cells only
Which of the following contraceptive methods to involve a role of hormone?
Pills, Emergency contraceptives, Barrier methods
Lactational amenorrhea, Pills, Emergency contraceptives
Barrier method, Lactational amenorrhea, Pills
CuT, Pills, Emergency contraceptives
Which of the following statements is incorrect?
Yeasts have filamentous bodies with long thread – like hyphae.
Morels and truffles are edible delicacies.
Claviceps is a source of many alkaloids and LSD.
Conidia are produced exogenously and ascospores endogenously.
It takes very long time for pineapple plants to produces flowers. Which combination of hormones can be applied to artificially induces flowering in pineapple plate throughout the year to increase yield
Cytokinin and Abscisic acid
Auxin and Ethylene
Gibberellin and Cytokinin
Gibberellin and Abscisic acid
Conversion of glucoses to glucose – 6 - phosphate, the first irrev ersible reaction of glycolysis is catalyzed by:
Phosphofructokinase
Aldolase
Hexokinase
Enolase
Consider following features: (a) Organ system level of organisation (b) Bilateral symmetry (c) True coelomates with segmentation of body Select the correct option of animal groups which posses all the above characteristics.
Annelida, Mollusca and Chordata
Annelida Arthropoda and Chordata
Annelida, Arthropoda and Mollusca
Arthropoda, Mollusca and Chordata
Which of the following muscular disorders is inherited?
Botulism
Tetany
Muscular dystrophy
Myasthenia gravis
The Earth Summit held in Rio de Janeiro in 1992 was called: 16 SPACE FOR ROUGH WORK
For immediate steps to discontinue use of CFSs that were damaging the ozone layer,
To reduce CO2 emissions and global warming.
For conservation of biodiversity and sustainable utilization of its benefits,
To assess threat posed to native species by invasive weed species.
Which of the following can be used as a biocontrol agent in the treatment of plant disease?
Lactobacillus
Trichoderma
Chlorella
Anabaena
Extrusion of second polar body from egg nucleus occurs:
simultaneously with first cleavage
after entry of sperm but before fertilization
after fertilization
before entry of sperm into ovum
Xylem translocates:
Water, mineral salts, some organic nitrogen and hormones
Water only
Water and mineral salts only
Water, mineral salts and some organic nitrogen only
The concept of “ Omnis cellula – e cellula ” regrading cell division was first proposed by:
Aristotle
Rudolf Virchow
Theodore Schwann
Schleiden
Which of the following glucose transporters is insulin – dependent?
GLUT IV
GLUT I
GLUT II
GLUT III
Which of the following statements is correct?
Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
Cornea is an external, transparent and protective proteinaceous covering of the eye – ball.
Cornea consists of dense connective tissue of elastin and can repair itself.
Cornea is convex, transparent layer which is highly vascularized.
Match the following genes of the Lac operon with their respective products:
| Column - I | Column - II |
| (a) i gene | (i) β - galactosidase |
| (b) z gene | (ii) Permease |
| (c) a gene | (iii) Repressor |
| (d) y gene | (iv) Transacetylase |
(iii) (iv) (i) (ii)
(i) (iii) (ii) (iv)
(iii) (i) (ii) (iv)
(iii) (i) (iv) (ii)
Respiratory Quotient (RQ) value of tripalmitin is:
0.09
0.9
0.7
0.07
Which of the following statements regarding mitochondria is incorrect?
Mitochondrial material contains single circular DNA molecule and ribosomes.
Outer membrane is permeable to monomers of carbohydrates, fats and proteins. 17 SPACE FOR ROUGH WORK
Enzymes of electron transport and embedded in outer membrane.
Inner membrane is convoluted with infoldings.
The shorter and longer arms of a submetacentric chromosome are referred to as:
m – arm and n – arm respectively
s – arm and l – am respectively
p – arm q – arm respectively
q – arm and p – arm respectively
Purines found both in DNA and RNA are:
Cytosine and thymine
Adenine and thymine
Adenine and guanine
Guanine and cytosine
Which of these following methods is the most suitable for disposal of nuclear waste?
Bur the waste within rocks deep below the Earth’s surface
Shoot the waste into space
Bury the waste under Antarctic ice – cover
Dump the waste within rocks under deep ocean
The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in:
Bronchioles and Fallopian tubes
Bile duct and Bronchioles
Fallopian tubes and Pancreatic duct
Eustachian tube and Salivary duct
Variations caused by mutation, as proposed by Hugo de Vries, are
Small and directionless
Random and directional
Random and directionless
Small and directional
How does steroid hormone influence the cellular activities?
using aquaporin channels are second messenger.
Changing the pe rmeability of the cell membrane.
Binding to DNA and forming a gene-hormone complex.
Activating cyclic AMP located on the cell membrane.
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F 2 generation showed white, red and pink flowers. Choose the incorrect statement from the following:
Law of Segregation does not apply in this experiment.
This experiment does not follow the Principle of Dominance.
Pink colour in F 1 is due to incomplete dominance
Ratio of F2 is 1 4 (Red): 2 1 (Pink): 1 4 (White)
Placentation in which ovules develop on the inner well of the ovary of in peripheral part is:
Free-central
Basal
Axile
Parietal
Select the correct group of biocontrol agents
Nostoc, Azospirillium, Nucleopolyhedrovirus
Bacillus thuringiensis , tobacco mosaic virus, Aphids 18 SPACE FOR ROUGH WORK
Trichoderma, Baculovirus, Bacillus thuringiensis
Oscillatoria, Rhizobium, Trichoderma
The correct sequence of phases of cell cycle is:
G1 → S → G2 → m
M → G1 → G2 →S
G1 → G2 →S → M
S → G1 → G2 → M
Which part of the brain is responsible for thermoregulation?
Medulla oblongata
Cerebrum
Hypothalamus
Corpus callosum
Which one of the following is not a method of is situ conservation of biodiversity?
Sacred Grove
Biosphere Reserve
Wildlife Sanctuary
Botanical Garden
Which of the following pairs of gases is mainly responsible for green house effect?
Carbon dioxide and Methane
Ozone and Ammonia
Oxygen and Nitrogen
Nitrogen and Sulphur dioxide
Persistent nucellus in the seed is known as :
Tegmen
Chalaza
Perisperm
Hilum
Watch the column-I with column-II Column-I Column-II (a) P-wave (i) Depolarisation of ventricles (b) QRS complex (ii) Repolarisution of ventricles (c) T-wave (iii) Coronary ischemia (d) Reduction I the (iv) Depolarisation size of T-wave of atria (v) Repolarisation of atria Select the correct option. (a) (b) (c) (d)
(ii) (iii) (v) (iv)
(iv) (i) (ii) (iii)
(iv) (i) (ii) (v)
(ii) (i) (v) (iii)
Following statements describe the characteristies of the enzyme Restriction Endonuclease. Identify the incorrect statement.
The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
The enzyme cuts DNA molecule at identified position within the DNA
The enzyme binds DNA at specific sites and cuts only of the tow strands.
The enzyme cuts the sugar -phosphate backbone at specific sites on each strand.
Which of the following is true for Golden rice?
It has yellow grains, because of a gene introduced from a primitive variety of rice
it Is vitamin a enriched, with a gene from daffodil.
it is pest resistant, with a gene from Bacillus thuringiensis.
It is drought tolerant, developed using Agrobacterium vector
Match column-I with Column-II
| Column - I | Column - II |
| (a) Saprophyte | (i) Symbiotic association fungi with plant roots |
| (b) Parasite | (ii) Decomposition of dead organic materials 19 SPACE FOR ROUGH WORK |
| (c) Lichens | (iii) Living on living planta or animals |
| (d) Mycorrhiza | (iv) Symbiotic association of algae and fungi |
(ii) (iii) (iv) (iv)
(i) (ii) (iii) (iv)
(iii) (ii) (i) (iv)
(ii) (i) (iii) (iv)
What would be the heart rate of a person if the cardiac output is 5L blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
125 beats per minute
50 beats per minute
75 beats per minute
100 beats per minute
Which of the following statements is incorrect?
prions consist of abnormally folded proteins
Viroids lack a protein coat
Viruses are obligate parasites
Infective constituent in viruses is the protein coat
Match the following structures with their respective location in organs
| Column - I | Column - II |
| (a) Crypts of Lieberktihn | (i) Pancreas |
| (b) Glisson’s capsule | (ii) Duodenum |
| (c) latest of Langerhans | (iii) Small intestine |
| (d) Brunner’s Glands | (iv) Laver |
(iii) (ii) (i) (iv)
(iii) (i) (ii) (iv)
(ii) (iv) (i) (iii)
(iii) (iv) (i) (ii)
which of the following immune responses is responsible for rejection of Kidney graft?
Cell-mediated immune response
Humoral immune response
Humoral immune response
Inflammatory immune response
identify the cells whose secretion protects the lining of gastro -intestinal tract from various enzymes.
Duodenal Cells
Chief Cells
Goblet Cells
Oxyntic Cells
Coder which of the following conditions will there be no change in the reading frame of following mRNA? 5” AACAGCGGUGCUAUU 3”
Deletion of GGU from 7th, 8th and 9th positions
Insertion of G at 5th position
Deletion of G from 5th position
Insertion of A and G at 4 th and 5 th positions respectively
Which of the following is a commercial blood cholesterol lowering agent?
Lipases
Cyclosporin A
Statin
Streptokinase
Select the incorrect statement.
Human males have one of their sex - chromosome much shorter than the other.
Male fruit fly is heterogametic.
In male grasshoppers, 50% of sperms have no sex-chromosome. 20 SPACE FOR ROUGH WORK
In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
Tidal volume and Expiratory Reserve Volume of in athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Wedual Volume is 1200 mL?
2700 mL
1500 mL
1700 mL
2200 mL
Select the correct sequence for transport of sperm cells in male reproductive system.
Testis → Epididymis → Vasa efferentia → Vas deferens → Ejaculatory duct → Inguinal canal → Urethra → Urethral meatus
Testis → Epididymis → Vasa efferentia → Rate testis → Inguinal canal → Urethra
Seminiferous tubules → Rate testis →Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra → Urethral meatus
Seminiferous tubules → Vasa efferentia → Epididymis → Inguinal canal → Urethra
Colostrum, the yellowish fluid, secreted by mother during the initial days of location is very essential to impart immunity to the newborn infants because it contains:
Immunoglobulin A
Natural killer cells
Monocytes
Macrophages
In some plants, the female gamete develops into is known as:
Parthenogenesis
Autogamy
Parthenocarpy
Syngamy
Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.
Salmonella typhi / Widal test
Plasmodium vivax / UTl test
Streptococcus / pneumoniae / Widal test
Salmonella typhi /Anthrone test
Expressed Sequence Tags (ESTs) refers to:
Novel DNA sequences
Plasmodium vivax / UTt test
Streptococcus pneumonic / Widal test
Salmonella typhi / Anthrome test
Match the following hormones with the respective diseases:
| Column - I | Column - II |
| (a) Insulin | (i) Addison’s disease |
| (b) Thyroxin | (ii) Diabetes insipidus |
| (c) Corticoids | (iii) Acromegaly |
| (d) Growth Hormone | (iv) Goiter (v) Diabetes mellitus |
(ii) (iv) (i) (iii)
(v) (i) (ii) (iii)
(v) (iv) (i) (i)
(v) (iv) (i) (iii)
Which of the following factors is responsible for the formation of concentrated urine
Hydrostatic pressure during glomerular filtration.
Low levels of antidiuretic hormone.
Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys. 21 SPACE FOR ROUGH WORK
Secretion of erythropoietin by Juxtaglomerular complex.
Select the hormone -releasing Intra -Uterine Devices.
Lippes Loop, Multiload 375
Vaults, LNG-20
Multiload 375, Progestasert
Progestasert, LNG-20
Match the following organisms with their respective characteristics:
| Column - I | Column - II |
| (a) Pila | (i) Flame cells |
| (b) Bombyx | (ii) Comb plates |
| (c) Pleurobrachia | (iii) Radula |
| (d) Taenia | (iv) Malpighian tubules |
(iii) (ii) (iv) (i)
(iii) (ii) (i) (iv)
(iii) (iv) (ii) (i)
(ii) (iv) (iii) (i)
which of the following sexually transmit diseases is not completely curable?
Chlamydiasis
Gonorrhea
Genital warts
Genital herpes
Drug called ‘Heroin’ is synthesized by:
Nitration of morphine
Methylation of morphine
Acetylation of morphine
glycosylation of morphine
What is the site of perception of photoperiod necessary for induction of flowering in plants?
Leaves
Lateral buds
Pulvinus
Shoot apex
A gene locus has two alleles A. a if the frequency of dominant allele A is 0.4. then what will be the frequency homozygous dominant, heterozygous and homozygous recessive individuals in the population?
0.16(AA); 0.36 (Aa); 0.48 (aa)
0.36(AA); 0.48 (Aa); 0.16 (aa)
0.16(AA); 0.24 (Aa); 0.36 (aa)
0.16(AA); 0.48 (Aa); 0.36 (aa)
What map unit (Centimorgan) is adopted in the construction of genetic maps?
A unit of distance between genes on chromosomes representing 50% cross over.
A unit of distance between two expressed genes, representing 10% cross over.
A unit of distance between two expressed Genes, representing 100% cross over
A unit of distance between genes on chromosomes, representing 1% cross over.
Concanavalin A is:
a pigment
an alkaloid
an essential oil
a lectin
Pinus seed cannot germinate and establish without fungal association. This is because:
Its seeds contain inhibitors that prevent germination.
Its embryo is immature.
It has obligate association with mycorrhizae
It has very hard seed coat.
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:
Sutton Boveri
T.H. Morgan
Gregor J. Mendel
Alfred Sturtevant
In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights form 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?
Cyclical Selection
Directional Selection
Stabilizing Selection
Disruptive Selection
Match the hominids with their correct brain size:
| Column - I | Column - II |
| (a) Homo habilis | (i) 900 cc |
| (b) Homo neanderthalensis | (ii) 1350 cc |
| (c) Homo erectus | (iii) 650-800 cc |
| (d) Homo sapiens | (iv) 1400 cc |
(iv) (iii) (i) (ii)
(iii) (i) (iv) (ii)
(iii) (ii) (i) (iv)
(iii) (iv) (i) (ii)
Select the correct option
There are seven pairs of vertehrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.
8𝑡ℎ, 9𝑡ℎ and 10𝑡ℎ pairs of ribs articulate directly with the sternum.
11𝑡ℎ and 12𝑡ℎ pairs of ribs are connected to the sternum with the help of hyaline cartilage.
Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.
What is the direction of movement of sugars in phloem?
Bi-directional
Non-multidirectional
Upward
Downward
Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
making tubes and pipes
making plastic sacks
use as a fertilizer
construction of roads
Which of the following ecological pyramids is generally inverted?
Pyramid of biomass in a sea
Pyramid of numbers in grassland
Pyramid of energy
Pyramid of biomass in a forest
use of an artificial kidney during hemotiayis may result in:
Nitrogenous waste build-up in the bod
Non-elimination of excess potassium from gastro-intestinal tract
Reduced absorption of calcium from gastro-intestinal tract
Reduced RBC production Which of the following options is the correct appropriate? (1) (a) and (d) are correct (2) (a) and (b) are correct (3) (b) and (c) are correct (4) (c) and (d) are correct
Which of the following pairs of organelles does not contain DNA?
Nuclear envelope and Mitochondria
Mitochondria and Lysosomes
Chloroplast and Vacuoles
Lysosomes and Vacuoles
Which of the following is the most important cause for animals and plants being driven to extinction?
Alien species invasion
Habitat loss and fragmentation
Drought and floods
Economic
What is the fate of the male gemetes discharged in the synergid?
One fuses with egg and other fuses with central cell nuclei.
One fuses with egg, other(s) degenerate(s) in the synergid.
All fuse with the egg.
one fuses with egg. other(s) fuse(s) with synergid nucleus.
Which of the following protocols did aim for reducing emission of chlorofluorocarbouns into the atmosphere ?
Geneva Protocol
Montreal protocol
Kyoto Protocol
Gothenburg Protocol
Due to increasing air borne allergens and pollutants many people in urban areas are suffering from respiratory disorder causing wheezing due to:
reduction in the secretion of surfactants by pneumocytes.
benign growth on mucous lining of nasal cavity .
inflammation of bronchi and bronchioles.
profile form of fibrous tissues and damage walls.
From evolutionary point of view retention of the female gametophyte with developing young embryo on the parent sporophyte for some time is first observed in
Gymnosperms
Liverworts
mosses
Pteridophytes
What is the genetic disorder in which an individual has an overall masculine development. Gynaecomastia and is sterile?
Down s syndrome
Turne’s syndrome
Klinefelter ‘s syndrome
Edward syndrome
Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DN Technology ?
Genetic code is specific
Genetic code is not ambiguous
Genetic code is redundant
Genetic code is nearly universal
match the following organisms with the products they produces :
| Column - I | Column - II |
| (a) Lactobacillus | (i) Cheese |
| (b) Saccharomyces | (ii) Curd |
| (c) Aspergillus niger | (iii) Citric Acid |
| (d) Acetobacter | (iv) Bread (v) Acetic Acid |
(ii) (i) (iii) (v)
(ii) (iv) (v) (iii)
(ii) (iv) (iii) (v)
(iii) (iv) (v) (i)
DNA precipitation out of a mixture of biomolecules can be achieved by treatment with :
Chilled Chloroform
Isopropanol
Chilled ethanol
Methanol at room temperature
Thiobacillus is a group of bacteria helpful in carrying out :
Denitrification
Nitrogen fixation
Chemoautotrophic fixation
Nitrification
Which of the following statements is not correct?
Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
Lysosomes have numerous hydrolytic enzymes.
The hydrolytic enzymes of lysosomes are active under acidic PH
Lysosomes are membrane bound structures.
Select the incorrect statement
Inbreeding helps in accumulation of superior genes and elimination of undesirable genes.
Inbreeding increases homozygosity.
Inbreeding is essential to evolve pure lines in any animal.
Inbreeding selects harmful recessive genes that reduce fertility and productivity.
Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth?
Pharynx → Oesophagus → Ileum → Crop → Gizzard→ Colon → Rectum
Pharynx → Oesophagus → Crop → Gizzard →Ileum →Colon→ Rectum
Pharynx → Oesophagus → Gizzard → Crop → Ileum → Colon → Rectum
Pharynx → Oesophagus →Gizzard → Ileum →Crop →Colon → Rectum
Consider the following statement: (A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group. (B)A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme. Select the correct option.
(A) is false but (B) is true.
Both (A) and (B) are true.
(A) is true but (B) are true.
Both (A) and (B) are false.
Which of the statements given below is not true about formation of Annual Rings in trees ?
Annual rings are not prominent in tree of temperate region.
Annual rings is a combination of spring wood and autumn wood produced in a year.
Differential activity of cambium causes light and dark b ands of tissue early and late wood respectively.
Activity of cambium depends upon variation in climate.
Which one of the following statements regarding post fertilization development in flowering plants is incorrect?
Ovules develop into embryo sac
Ovary develops into fruit
Zygote develops into embryo
Central cell develops into endosperm
Which one of the following equipment is essentially required for growing increase on a large scale for industrial production of enamels?
Bioreactor
BOD incubator
Sludge digester
Industrial oven
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Source: National Testing Agency (NTA), NEET-UG 2019 Question Paper, Code R3. Solutions written for educational use, NCERT-aligned. Verify your answers against the official NTA answer key.