Official NTA NEET-UG 2017 question paper, set A. 180 questions across Physics, Chemistry, and Biology with worked solutions and the official answer key.
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves :
Cells
Potential gradients
A condition of no current flow through the galvanometer
A combination of cells, galvanometer and resistances
A gas mixture consists of 2 moles of O 2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
4 RT
15 RT
9 RT
11 RT
Radioactive material 'A' has decay constant '8λ' and material 'B' has decay constant 'λ'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be 1 e ?
1 λ
1 7λ
1 8λ
1 9λ
A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is Pa Pa F 10 mm A Oil B E Final water level Initial water level 65 mm C 65 mm Water D
650 kg m –3
425 kg m –3
800 kg m –3
928 kg m –3
A 250-Turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 μA and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is
9.1 μJ
55 μJ
3 μJ
15 μJ
The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is
h mkT
3 h mkT
2 3 h mkT
2h mkT
One end of string of length l is connected to a particle of mass ‘m’ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed ‘v’, the net force on the particle (directed towards center) will be (T represents the tension in the string)
T
2mvT l+
2mvT l-
Zero
Figure shows a circuit contains three identical resistors with resistance R = 9.0 Ω each, two identical inductors with inductance L = 2.0 mH each, and an ideal battery with emf ε = 18 V. The current 'i' through the battery just after the switch closed is – +ε C R RL R L
2 mA
0.2 A
2 A
0 ampere
The x and y coordinates of the particle at any time are x = 5 t – 2t2 and y = 10 t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2 s is
0
5 m/s 2
–4 m/s 2
–8 m/s 2
Suppose the charge of a proton and an electron differ slightly. One of them is –e, the other is ( e + Δe). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then Δe is of the order of [Given mass of hydrogen mh = 1.67 × 10 –27 kg]
10 –20 C
10 –23 C
10 –37 C
10 –47 C
Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be A K1 B K2 d T1 T2
12 2 KK+
() 123 2 KK+
K1 + K2
2( K1 + K2)
The diagrams below show regions of equipotentials. 20 V 40 V 10 V 30 V BA 20 V 40 V 10 V 30 V BA 40 V 20 V 10 V 30 V40 V20 V 10 V 30 V BA BA (a) (b) (c) (d) A positive charge is moved from A to B in each diagram.
Maximum work is required to move q in figure (c).
In all the four cases the work done is the same.
Minimum work is required to move q in figure (a).
Maximum work is required to move q in figure (b).
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is
2
1
4
0.5
Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8 th bright fringe in the medium lies where 5 th dark fringe lies in air. The refractive index of the medium is nearly
25
59
69
78
A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is
5 π
5 2π
4 5 π
2 3 π
Thermodynamic processes are indicated in the following diagram. Match the following
| Column-1 | Column-2 |
| P. Process I | a. Adiabatic |
| Q. Process II | b. Isobaric |
| R. Process III | c. Isochoric |
| S. Process IV | d. Isothermal |
P → a, Q → c, R → d, S → b
P → c, Q → a, R → d, S → b
P → c, Q → d, R → b, S → a
P → d, Q → b, R → a, S → c
A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system
Increases by a factor of 4
Decreases by a factor of 2
Remains the same
Increases by a factor of 2 www.vedantu.com 5
The photoelectric threshold wavelength of silver is 3250 × 10–10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10–10 m is (Given h = 4.14 × 10 –15 eVs and c = 3 × 108 ms–1)
≈ 6 × 10 5 ms–1
≈ 0.6 × 10 6 ms–1
≈ 61 × 10 3 ms–1
≈ 0.3 × 10 6 ms–1
A physical quantity of the dimensions of length that can be formed out of c, G and 2 04 e πε is [c is velocity of light, G is universal constant of gravitation and e is charge]
1 2 2 2 0 1 4 eG c ⎡⎤ ⎢⎥ πε⎣⎦
1 2 22 04 ecG ⎡⎤ ⎢⎥ πε⎣⎦
1 2 2 2 0 1 4 e Gc ⎡⎤ ⎢⎥ πε⎣⎦
2 0 1 4 eGc πε
Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]
350 Hz
361 Hz
411 Hz
448 Hz
In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2 k Ω, the voltage and power gain of the amplifier is
200 and 1000
15 and 200
150 and 15000
20 and 2000
Which one of the following represents forward bias diode?
–2 V0 V R
–3 V–4 V R
+2 V–2 V R
5 V3 V R
A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k′. Then they are connected in parallel and force constant is k ′′. Then k′ : k′′ is
1 : 6
1 : 9
1 : 11
1 : 14
The given electrical network is equivalent to A B Y
AND gate
OR gate
NOR gate
NOT gate
The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then
1 km2d =
d = 1 km
3 km2d =
d = 2 km
Which of the following statements are correct? (a) Centre of mass of a body always coincides with the centre of gravity of the body. (b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero (c) A couple on a body produce both translational and rotational motion in a body. (d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
(b) and (d)
(a) and (b)
(b) and (c)
(c) and (d)
A Carnot engine having an efficiency of 1 10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is
1 J
90 J
99 J
100 J
If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by
cot 2θ = cot 2θ1 + cot 2θ2
tan 2θ = tan 2θ1 + tan 2θ2
cot 2θ = cot 2θ1 – cot2θ2
tan 2θ = tan2θ1 – tan2θ2
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘I’ along the same direction is shown in Fig. Magnitude of force per unit length on the middle wire ‘B’ is given by 90° CB A d d
2 0 2 I d μ π
2 02 I d μ π
2 02 I d μ π
2 0 2 I d μ π
Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will:
Keep floating at the same distance between them
Move towards each other
Move away from each other
Will become stationary
In an electromagnetic wave in free space the root mean square value of the electric field is E rms = 6 V/m. The peak value of the magnetic field is
41 × 10 –8 T
83 × 10 –8 T
0.70 × 10 –8 T
23 × 10 –8 T
The bulk modulus of a spherical object is ‘B’. If it is subjected to uniform pressure ‘ p’, the fractional decrease in radius is
p B
3 B p
3p B
3 p B
The ratio of resolving powers of an optical microscope for two wavelengths λ1 = 4000 Å and λ2 = 6000 Å is
8 : 27
9 : 4
3 : 2
16 : 81
Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take g constant with a value 10 m/s2. The work done by the (i) gravitational force and the (ii) resistive force of air is
(i) – 10 J (ii) –8.25 J
(i) 1.25 J (ii) –8.25 J
(i) 100 J (ii) 8.75 J
(i) 10 J (ii) –8.75 J
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
225
450
1000
1800
Two blocks A and B of masses 3 m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively A B 3m m
g, 3 g
3 g , g
g, g
3 g , 3 g
Two Polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light I0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45º with that of P 1. The intensity of transmitted light through P2 is
0 2 I
0 4 I
0 8 I
0 16 I
A long solenoid of diameter 0.1 m has 2 × 10 4 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10 π 2 Ω, the total charge flowing through the coil during this time is
32 π?μC
16 μC
32 μC
16 π?μC
Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities ω1 and ω2. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is
2 12 1 ()2 I ω+ ω
2 12 1 ()4 I ω- ω
I(ω1 – ω2)2
2 12()8 I ω- ω
Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t 2. The time taken by her to walk up on the moving escalator will be
12 2 tt +
12 21– tt tt
12 21 tt tt +
t1 – t2
A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?
25 m/s 2
0.25 rad/s 2
25 rad/s 2
5 m/s 2 www.vedantu.com 11
A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle θ, the spot of the light is found to move through a distance y on the scale. The angle θ is given by
2 y x
y x
2 x y
x y
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?
10 Hz
20 Hz
30 Hz
40 Hz
A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be
4°
6°
8°
10°
The resistance of a wire is ‘ R’ ohm. If it is melted and stretched to ‘n’ times its original length, its new resistance will be
nR
R n
n2R
2 R n
With respect to the conformers of ethane, which of the following statements is true?
Bond angle remains same but bond length changes
Bond angle changes but bond length remains same
Both bond angle and bond length change
Both bond angles and bond length remains same
Which of the following pairs of compounds is isoelectronic and isostructural?
BeCl 2, XeF2
Tel2, XeF2
22IBr , XeF-
IF 3, XeF2
HgCl 2 and I2 both when dissolved in water containing I– ions the pair of species formed is
– 23HgI , I
– 2HgI , I
2– – 43HgI , I
– 22Hg I , I
Mixture of chloroxylenol and terpineol acts as
Analgesic
Antiseptic
Antipyretic
Antibiotic
Which is the incorrect statement?
FeO 0.98 has non stoichiometric metal deficiency defect
Density decreases in case of crystals with Schottky's defect
NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal
Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
Concentration of the Ag + ions in a saturated solution of Ag2C2O4 is 2.2 × 10 –4 mol L–1. Solubility product of Ag2C2O4 is
42 × 10 –8
66 × 10 –12
5 × 10 –11
5.3 × 10 –12
Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
OH O
O
OH
OO www.vedantu.com 13
The species, having bond angles of 120° is
PH 3
CIF 3
NCl 3
BCl 3
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be
Doubled
Halved
Tripled
Unchanged
Which one is the most acidic compound?
OH CH3
OH
OH NO2
OH NO2 NO2O2N
It is because of inability of ns 2 electrons of the valence shell to participate in bonding that
Sn 2+ is reducing while Pb4+ is oxidising
Sn 2+ is oxidising while Pb4+ is reducing
Sn 2+ and Pb2+ are both oxidising and reducing
Sn 4+ is reducing while Pb4+ is oxidising
Predict the correct intermediate and product in the following reaction HC3 C CH HO , HS O22 4 HgSO4 intermediate product (A) (B)
A : HC3 C CH2 SO4 B : HC3 C CH3 O
A : HC3 C CH2 OH B : HC3 C CH2 SO4
A : HC3 C CH3 O B : HC3 C CH
A : HC3 CC H 2 OH B : HC3 C CH3 O
Which one of the following statements is not correct?
Catalyst does not initiate any reaction
The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
Enzymes catalyse mainly bio-chemical reactions
Coenzymes increase the catalytic activity of enzyme
Which one is the wrong statement?
de-Broglie's wavelength is given by h mvλ= , where m = mass of the particle, v = group velocity of the particle
The uncertainty principle is hEt 4Δ× Δ ≥ π
Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement
The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be
1136.25 J
–500 J
–505 J
+505 J
Consider the reactions : X (C H O)26 Cu / 573 K A [Ag(NH ) ] –OH, 32 + Δ –OH, Δ YO NH – NH – C – NH22 Z Silver mirror observed Identify A, X, Y and Z
A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine
A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone
A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
Which one is the correct order of acidity?
CH 2 = CH 2 > CH 3 – CH = CH 2 > CH 3 – C ≡ CH > CH ≡ CH
CH ≡ CH > CH 3 – C ≡ CH > CH 2 = CH 2 > CH3 – CH3
CH ≡ CH > CH 2 = CH 2 > CH 3 – C ≡ CH > CH3 – CH3
CH 3 – CH3 > CH 2 = CH 2 > CH 3 – C ≡ CH > CH ≡ CH
In the electrochemical cell : Zn|ZnSO4(0.01M)||CuSO4(1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO 4 is changed to 1.0 M and that of CuSO 4 changed to 0.01 M, the emf changes to E 2. From the following, which one is the relationship between E 1 and E 2? (Given, RT F = 0.059)
E 1 = E 2
E 1 < E 2
E 1 > E 2
E 2 = 0 ≠ E1
The correct increasing order of basic strength for the following compounds is NH2 NH2 NH2 NO2 CH3 (I) (II) (III)
II < III < I
III < I < II
III < II < I
II < I < III
In which pair of ions both the species contain S – S bond?
S 2O7 2–, S2O3 2–
S 4O6 2–, S2O3 2–
S 2O7 2–, S2O8 2–
S 4O6 2–, S2O7 2–
The correct order of the stoichiometries of AgCl formed when AgNO 3 in excess is treated with the complexes : CoCl3⋅6NH3, CoCl3⋅5NH3, CoCl3⋅4NH3 respectively is
1 AgCl, 3 AgCl, 2 AgCl
3 AgCl, 1 AgCl, 2 AgCl
3 AgCl, 2 AgCl, 1 AgCl
2 AgCl, 3 AgCl, 1 AgCl
Match the interhalogen compounds of column I with the geometry in column II and assign the correct code
| Column - I | Column - II |
| (a) XX′ | (i) T-shape |
| (b) 3XX′ | (ii) Pentagonal bipyramidal |
| (c) 5XX′ | (iii) Linear |
| (d) 7XX′ | (iv) Square-pyramidal (v) Tetrahedral Code : |
(iii) (iv) (i) (ii)
(iii) (i) (iv) (ii)
(v) (iv) (iii) (ii)
(iv) (iii) (ii) (i)
The reason for greater range of oxidation states in actinoids is attributed to
The radioactive nature of actinoids
Actinoid contraction
5f, 6d and 7s levels having comparable energies
4f and 5d levels being close in energies
A 20 litre container at 400 K contains CO 2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO 2 attains its maximum value, will be (Given that : SrCO 3(s) ⇌SrO(s) + CO 2(g). Kp = 1.6 atm)
5 litre
10 litre
4 litre
2 litre
The correct statement regarding electrophile is
Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile
Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
Which of the following is a sink for CO?
Haemoglobin
Micro-organisms present in the soil
Oceans
Plants
The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?
Halogen family, [Rn] 5 f 146d107s27p5
Carbon family, [Rn] 5f146d107s27p2
Oxygen family, [Rn] 5f146d107s27p4
Nitrogen family, [Rn] 5f146d107s27p6
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is
[Co(en) 3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
[Co(H 2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
[Co(H 2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
[Co(NH 3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
Which of the following statements is not correct?
Insulin maintains sugar level in the blood of a human body
Ovalbumin is a simple food reserve in egg-white
Blood proteins thrombin and fibrinogen are involved in blood clotting
Denaturation makes the proteins more active
An example of a sigma bonded organometallic compound is :
Ruthenocene
Grignard's reagent
Ferrocene
Cobaltocene
Which of the following is dependent on temperature?
Molality
Molarity
Mole fraction
Weight percentage
For a given reaction, ΔH = 35.5 kJ mol –1 and ΔS = 83.6 JK –1 mol–1. The reaction is spontaneous at : (Assume that ΔH and ΔS do not vary with temperature)
T < 425 K
T > 425 K
All temperatures
T > 298 K
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is
Sublimation
Chromatography
Crystallisation
Steam distillation
Which one of the following pairs of species have the same bond order?
CO, NO
O 2, NO+
CN –, CO
N 2, O2 –
Identify A and predict the type of reaction OCH3 Br NaNH2 A
OCH3 NH2 and substitution reaction
OCH3 NH2 and elimination addition reaction
OCH3 Br and cine substitution reaction
OCH3 and cine substitution reaction
A first order reaction has a specific reaction rate of 10–2 s–1. How much time will it take for 20 g of the reactant to reduce to 5 g?
238.6 second
138.6 second
346.5 second
693.0 second
Name the gas that can readily decolourises acidified KMnO4 solution:
CO 2
SO 2
NO 2
P 2O5
The heating of phenyl-methyl ethers with HI produces.
Ethyl chlorides
Iodobenzene
Phenol
Benzene
Pick out the correct statement with respect [Mn(CN)6]3– :
It is sp3d2 hybridised and octahedral
It is sp 3d2 hybridised and tetrahedral
It is d2sp3 hybridised and octahedral
It is dsp2 hybridised and square planar
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
Na
K
Rb
Li
The equilibrium constants of the following are. N2 + 3H2 ⇌2NH3 K1 N2 + O2 ⇌ 2NO K 2 22 2 1HO H O2+⎯ ⎯ → K3 The equilibrium constant (K) of the reaction: K 32 2 52NH O 2NO 3H O,2++ ⇌ will be
3 13 2KK /K
3 23 1KK / K
K 2K3 /K 1
3 23 1KK / K
Which of the following reactions is appropriate for converting acetamide to methanamine?
Carbylamine reaction
Hoffmann hypobromamide reaction
Stephens reaction
Gabriels phthalimide synthesis
Mechanism of a hypothetical reaction X2 + Y2 → 2XY is given below : (i) X 2 → X + X (fast) (ii) X + Y 2 ⇌ XY + Y (slow) (iii) X + Y → XY (fast) The overall order of the reaction will be
1
2
0
5
The IUPAC name of the compound HCOO is ________.
3-keto-2-methylhex-4-enal
5-formylhex-2-en-3-one
5-methyl-4-oxohex-2-en-5-al
3-keto-2-methylhex-5-enal
Extraction of gold and silver involves leaching with CN– ion. Silver is later recovered by
Liquation
Distillation
Zone refining
Displacement with Zn
Double fertilization is exhibited by
Gymnosperms
Algae
Fungi
Angiosperms
Which of the following are found in extreme saline conditions?
Archaebacteria
Eubacteria
Cyanobacteria
Mycobacteria
Select the mismatch :
Frankia – Alnus
Rhodospirillum – Mycorrhiza
Anabaena – Nitrogen fixer
Rhizobium – Alfalfa
What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?
The larger the fragment size, the farther it moves
The smaller the fragment size, the farther it moves
Positively charged fragments move to farther end
Negatively charged fragments do not move
Attractants and rewards are required for
Anemophily
Entomophily
Hydrophily
Cleistogamy
Which of the following is made up of dead cells?
Xylem parenchyma
Collenchyma
Phellem
Phloem
Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme?
Argentaffin cells
Paneth cells
Zymogen cells
Kupffer cells
Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature? (a) They do not need to reproduce (b) They are somatic cells (c) They do not metabolize (d) All their internal space is available for oxygen transport
Only (d)
Only (a)
(a), (c) and (d)
(b) and (c)
The hepatic portal vein drains blood to liver from
Heart
Stomach
Kidneys
Intestine
The final proof for DNA as the genetic material came from the experiments of
Griffith
Hershey and Chase
Avery, Mcleod and McCarty
Hargobind Khorana
Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
Bacillus
Pseudomonas
Mycoplasma
Nostoc
Which of the following options gives the correct sequence of events during mitosis?
Condensation → nuclear membrane disassembly → crossing over → segregation → telophase
Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
Condensation → crossing over → nuclear membrane disassembly → segregation → telophase
Condensation → arrangement at equator → centromere division → segregation → telophase
Which one of the following statements is correct, with reference to enzymes?
Apoenzyme = Holoenzyme + Coenzyme
Holoenzyme = Apoenzyme + Coenzyme
Coenzyme = Apoenzyme + Holoenzyme
Holoenzyme = Coenzyme + Cofactor
During DNA replication, Okazaki fragments are used to elongate
The leading strand towards replication fork
The lagging strand towards replication fork
The leading strand away from replication fork
The lagging strand away from the replication fork
Which of the following are not polymeric?
Nucleic acids
Proteins
Polysaccharides
Lipids
The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as
Core zone
Buffer zone
Transition zone
Restoration zone
A dioecious flowering plant prevents both:
Autogamy and xenogamy
Autogamy and geitonogamy
Geitonogamy and xenogamy
Cleistogamy and xenogamy
A temporary endocrine gland in the human body is
Pineal gland
Corpus cardiacum
Corpus luteum
Corpus allatum
Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II):
| Column - I | Column - II |
| (a) Gonorrhea | (i) HIV |
| (b) Syphilis | (ii) Neisseria |
| (c) Genital Warts | (iii) Treponema |
| (d) AIDS | (iv) Human Papilloma virus |
(ii) (iii) (iv) (i)
(iii) (iv) (i) (ii)
(iv) (ii) (iii) (i)
(iv) (iii) (ii) (i)
Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections?
Autoimmune response
Cell-mediated immune response
Hormonal immune response
Physiological immune response
Spliceosomes are not found in cells of
Plants
Fungi
Animals
Bacteria
An example of colonial alga is
Chlorella
Volvox
Ulothrix
Spirogyra
Which of the following represents order of 'Horse'?
Equidae
Perissodactyla
Caballus
Ferus
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
Lysosome
Ri bosome
Chloroplast
Mitochondrion
The process of separation and purification of expressed protein before marketing is called
Upstream processing
Downstream processing
Bioprocessing
Postproduction processing
Mycorrhizae are the example of
Fungistasis
Amensalism
Antibiosis
Mutualism
Viroids differ from viruses in having :
DNA molecules with protein coat
DNA molecules without protein coat
RNA molecules with protein coat
RNA molecules without protein coat
Root hairs develop from the region of
Maturation
Elongation
Root cap
Meristematic activity
Coconut fruit is a
Drupe
Berry
Nut
Capsule
Plants which produce characterstic pneumatophores and show vivipary belong to
Mesophytes
Halophytes
Psammophytes
Hydrophytes
Which one of the following is related to Ex-situ conservation of threatened animals and plants?
Wildlife Safari parks
Biodiversity hot spots
Amazon rainforest
Himalayan region
Select the mismatch :
Pinus – Dioecious
Cycas – Dioecious
Salvinia – Heterosporous
Equisetum – Homosporous
Which of the following facilitates opening of stomatal aperture?
Contraction of outer wall of guard cells
Decrease in turgidity of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
The association of histone H1 with a nucleosome indicates:
Transcription is occurring
DNA replication is occurring
The DNA is condensed into a Chromatin Fibre
The DNA double helix is exposed
DNA fragments are
Positively charged
Negatively charged
Neutral
Either positively or negatively charged depending on their size
Capacitation occurs in
Rete testis
Epididymis
Vas deferens
Female Reproductive tract
Which ecosystem has the maximum biomass?
Forest ecosystem
Grassland ecosystem
Pond ecosystem
Lake ecosystem
A d isease caused by an autosomal primary non-disjunction is
Down's syndrome
Klinefelter's syndrome
Turner's syndrome
Sickle cell anemia
Life cycle of Ectocarpus and Fucus respectively are
Haplontic, Diplontic
Diplontic, Haplodiplontic
Haplodiplontic, Diplontic
Haplodiplontic, Haplontic
A gene encoding a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?
1
11
33
333
The pivot joint between atlas and axis is a type of
Fibrous joint
Cartilaginous joint
Synovial joint
Saddle joint
A gene whose expression helps to identify transformed cell is known as
Selectable marker
Vector
Plasmid
Structural gene
Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :
Tropical Savannah
Tropical Rain Forest
Grassland
Temperate Forest
The genotypes of a Husband and Wife are I AIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?
3 genotypes ; 3 phenotypes
3 genotypes ; 4 phenotypes
4 genotypes ; 3 phenotypes
4 genotypes ; 4 phenotypes
Zygotic meiosis is characteristic of
Marchantia
Fucus
Funaria
Chlamydomonas
Which of the following is correctly matched for the product produced by them?
Acetobacter aceti : Antibiotics
Methanobacterium : Lactic acid
Penicillium notatum : Acetic acid
Saccharomyces cerevisiae : Ethanol
Frog's heart when taken out of the body continues to beat for some time Select the best option from the following statements (a) Frog is a poikilotherm (b) Frog does not have any coronary circulation (c) Heart is "myogenic" in nature (d) Heart is autoexcitable Options
Only (c)
Only (d)
(a) & (b)
(c) & (d)
Which statement is wrong for Krebs' cycle?
There are three points in the cycle where NAD + is reduced to NADH + H+
There is one point in the cycle where FAD + is reduced to FADH2
During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised
The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
In case of poriferans the spongocoel is lined with flagellated cells called :
Ostia
Oscula
Choanocytes
Mesenchymal cells
Which of the following RNAs should be most abundant in animal cell?
r-RNA
t-RNA
m-RNA
mi-RNA
Which among these is the correct combination of aquatic mammals?
Seals, Dolphins, Sharks
Dolphins, Seals, Trygon
Whales, Dolphins, Seals
Trygon, Whales, Seals
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
Light saturation for CO 2 fixation occurs at 10% of full sunlight
Increasing atmospheric CO2 concentration upto 0.05% can enhance CO2 fixation rate
C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum
Tomato is a greenhouse crop which can be grown in CO2 - enriched atmosphere for higher yield
Asymptote in a logistic growth curve is obtained when
The value of 'r' approaches zero
K = N
K > N
K < N
Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation :
X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends
X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
The DNA fragments separated on an agarose gel can be visualised after staining with
Bromophenol blue
Acetocarmine
Aniline blue
Ethidium bromide
Functional megaspore in an angiosperm develops into
Ovule
Endosperm
Embryo sac
Embryo
Among the following characters, which one was not considered by Mendel in his experiments on pea?
Stem – Tall or Dwarf
Trichomes – Glandular or non-glandular
Seed – Green or Yellow
Pod – Inflated or Constricted
Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of :
Residual Volume
Inspiratory Reserve Volume
Tidal Volume
Expiratory Reserve Volume
GnRH, a hypothalamic hormone, needed in reproduction, acts on
Anterior pituitary gland and stimulates secretion of LH and oxytocin
Anterior pituitary gland and stimulates secretion of LH and FSH
Posterior pituitary gland and stimulates secretion of oxytocin and FSH
Posterior pituitary gland and stimulates secretion of LH and relaxin
In Bougainvillea thorns are the modifications of
Stipules
Adventitious root
Stem
Leaf
Which one from those given below is the period for Mendel's hybridization experiments?
1856 - 1863
1840 - 1850
1857 - 1869
1870 - 1877
Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements: (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of vitamin A (d) Retinal is a light absorbing part of all the visual photopigments
(a) & (b)
(a), (c) & (d)
(a) & (c)
(b), (c) & (d)
Which one of the following statements is not valid for aerosols?
They are harmful to human health
They alter rainfall and monsoon patterns
They cause increased agricultural productivity
They have negative impact on agricultural land
A decrease in blood pressure/volume will not cause the release of
Renin
Atrial Natriuretic Factor
Aldosterone
ADH
Homozygous purelines in cattle can be obtained by
mating of related individuals of same breed
mating of unrelated individuals of same breed
mating of individuals of different breed
mating of individuals of different species
The vascular cambium normally gives rise to
Phelloderm
Primary phloem
Secondary xylem
Periderm
Which of the following stat ements is correct?
The ascending limb of loop of Henle is impermeable to water
The descending limb of loop of Henle is impermeable to water
The ascending limb of loop of Henle is permeable to water
The descending limb of loop of Henle is permeable to electrolytes
Fruit and leaf drop at early stages can be prevented by the application of
Cytokinins
Ethylene
Auxins
Gi bberellic acid
A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
Incisors
Canines
Pre-molars
Molars
An im portant characteristic that Hemichordates share with Chordates is
Absence of notochord
Ventral tubular nerve cord
Pharynx with gill slits
Pharynx without gill slits
Artificial selection to obtain cows yielding higher milk output represents
Stabilizing selection as it stabilizes this character in the population
Directional as it pushes the mean of the character in one direction
Disruptive as it splits the population into two one yielding higher output and the other lower output
Stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows
Select the correct route for the passage of sperms in male frogs :
Testes → Bidder's canal → Kidney → Vasa efferentia → Urinogenital duct → Cloaca
Testes → Vasa efferentia → Kidney → Seminal Vesicle → Urinogenital duct → Cloaca
Testes → Vasa efferentia → Bidder's canal → Ureter → Cloaca
Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca
Which of the following options best represents the enzyme composition of pancreatic juice?
Amylase, peptidase, trypsinogen, rennin
Amylase, pepsin, trypsinogen, maltase
Peptidase, amylase, pepsin, rennin
Lipase, amylase, trypsinogen, procarboxy- peptidase
Phosphoenol pyruvate (PEP) is the primary CO 2 acceptor in :
C3 plants
C4 plants
C2 plants
C3 and C4 plants
The morphological nature of the edible part of coconut is
Perisperm
Cotyledon
Endosperm
Pericarp
Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
Chromosomes will not condense
Chromosomes will be fragmented
Chromosomes will not segregate
Recombination of chromosome arms will occur
MALT constitutes about ___________ percent of the lymphoid tissue in human body.
50%
20%
70%
10%
Receptor sites for neurotransmitters are present on
Membranes of synaptic vesicles
Pre-synaptic membrane
Tips of axons
Post-synaptic membrane
Hypersecretion of Growth Hormone in adults does not cause further increase in height, because
Growth Hormone becomes inactive in adults
Epiphyseal plates close after adolescence
Bones loose their sensitivity to Growth Hormone in adults
Muscle fibres do not grow in size after birth
Alexander Von Humbolt described for the first time
Ecological Biodiversity
Laws of limiting factor
Species area relationships
Population Growth equation
Myelin sheath is produced by
Schwann Cells and Oligodendrocytes
Astrocytes and Schwann Cells
Oligodendrocytes and Osteoclasts
Osteoclasts and Astrocytes
In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation?
Intrauterine transfer
Gamete intracytoplasmic fallopian transfer
Artificial Insemination
Intracytoplasmic sperm injection www.vedantu.com 30
Which of the following components provides sticky character to the bacterial cell?
Cell wall
Nuclear membrane
Plasma membrane
Glycocalyx
DNA replication in bacteria occurs
During S-phase
Within nucleolus
Prior to fission
Just before transcription
The function of copper ions in copper releasing IUD's is :
They suppress sperm motility and fertilising capacity of sperms
They inhibit gametogenesis
They make uterus unsuitable for implantation
They inhibit ovulation
Which of the following in sewage treatment removes suspended solids?
Tertiary treatment
Secondary treatment
Primary treatment
Sludge treatment
The water potential of pure water is
Zero
Less than zero
More than zero but less than one
More than one
Identify the wrong statement in context of heartwood.
Organic compounds are deposited in it
It is highly durable
It conducts water and minerals efficiently
It comprises dead elements with highly lignified walls
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.
Both are due to a qualitative defect in globin chain synthesis
Both are due to a quantitative defect in globin chain synthesis
Thalassemia is due to less synthesis of globin molecules
Sickle cell anemia is due to a quantitative problem of globin molecules
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by
Water
Bee
Wind
Bat
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Source: National Testing Agency (NTA), NEET-UG 2017 Question Paper, Code A. Solutions written for educational use, NCERT-aligned. Verify your answers against the official NTA answer key.