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Re-NEET 2026
ReNEET 2026
172 questions · Click an option and press Check Answer to reveal the result
1
Two identical inductors are connected in two different configurations P and Q, where a time varying current I(t) is flowing, as shown in the figure. The induced emf between points a and b for configuration P is Ep and that for configuration Q is Eq. The ratio Ep/Eq is : [Neglect the effect of mutual inductance.]
A
1/4
B
1/2
C
1
D
2
2
Arrange the following compounds in the increasing order of polarity A. CH₃CH₂OCH₂CH₃ B. CH₃CH₂OH C. CH₃COCH₃ D. CH₃COOH Choose the correct answer from the options given below :
A
A < B < C < D
B
C < A < D < B
C
C < A < B < D
D
A < C < B < D
3
The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is
A
leucine
B
threonine
C
methionine
D
serine
4
For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?
A
Father: IAi and Mother: ii
B
Father: IBi and Mother: ii
C
Father: IAi and Mother: IBi
D
Father: IAIA and Mother: ii
5
According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is
A
CO > NH₃ > H₂O > Cl⁻
B
CO > H₂O > NH₃ > Cl⁻
C
Cl⁻ > H₂O > NH₃ > CO
D
Cl⁻ > NH₃ > H₂O > CO
6
Consider that an electron is revolving in an excited state of Hydrogen atom with velocity √25.6 × 10⁵ ms⁻¹. The radius of the orbit is x × 10⁻⁹ m. The value of x is : [Take the mass of electron to be 9 × 10⁻³¹ kg, charge of electron = −1.6 × 10⁻¹⁹ C and 1/4πɛ₀ = 9 × 10⁹ N m² C⁻²]
A
4
B
3
C
2
D
1
7
The green paramagnetic species formed by heating KMnO₄ at 513 K is
A
K₂MnO₄
B
Mn₃O₄
C
MnO
D
KO₂
8
Among the following, the compound having conjugated double bonds is
A
hepta-1,3-diene
B
hepta-1,4-diene
C
hepta-1,5-diene
D
hepta-1,6-diene
9
The mean free path of molecules in an ideal gas A is half that of another ideal gas B. The diameter of the spherical molecules of gas A is twice the diameter of the molecules of B. If number densities of the gases A and B are nA and nB, respectively, then the correct option is :
A
nA = nB
B
nA = 2nB
C
nA = 1/4 nB
D
nA = 1/2 nB
10
Given below are two statements: Statement I: Modern Homo sapiens arose in Australia and moved across continents. Statement II: Homo sapiens arose around 75000 to 10000 years ago. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
11
Select the correct sequence of experiments that led to the gradual understanding of photosynthesis in green plants.
A
Absorption spectra of chlorophyll a and b → role of blue and red light → action spectrum → Engelmann's experiment
B
Role of red and blue light → production of O₂ → absorption spectrum → action spectrum
C
Release of oxygen → production of glucose → absorption spectrum → action spectrum
D
Production of glucose → role of air → release of oxygen → absorption spectrum
12
The correct statement is
A
Boron has a maximum covalency of four.
B
Beryllium has three valence orbitals.
C
Magnesium has a maximum covalency of four.
D
Aluminium has five valence orbitals.
13
The correct statement about peptides and proteins is
A
Tertiary structure of proteins has two or more polypeptide subunits
B
Only the proteins having a quaternary structure are biologically active.
C
In β-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds.
D
In α-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds.
14
Consider the following reaction sequences and choose the correct option
A
K and L are geometrical isomers.
B
K and L are enantiomers.
C
M and N are geometrical isomers.
D
M and N are stereoisomers.
15
In potash alum, the ratio of K⁺ and SO₄²⁻ ions is
A
1 : 2
B
2 : 1
C
2 : 3
D
3 : 2
16
A 1 : 3 electrolyte in an aqueous solution is
A
[CoCl₂(NH₃)₄]Cl
B
[CoCl(NH₃)₅]Cl₂
C
[Co(NH₃)₆]Cl₃
D
[Co(NH₃)₃(NO₂)₃]
17
Which of the following are primary consumers in a food chain?
A
Parasites
B
Predators
C
Herbivores
D
Carnivores
18
2A ⟶(k) B is a zero-order reaction, where k = 1.0 mol L⁻¹ min⁻¹. If the initial concentration of A is 2 M, then the time taken to complete 75% of the reaction will be
A
1.5 min
B
0.75 min
C
1.0 min
D
2.0 min
19
Among the following options, the correct trend in the electron gain enthalpy is
A
F > Cl > Br > I
B
Br > Cl > F > I
C
Cl > F > Br > I
D
I > Br > Cl > F
20
Consider the following schematic plots of orbital wavefunction (ψᵣ) against distance (r) from the nucleus. The figure representing two radial nodes in the orbital is
A
A
B
B
C
C
D
D
21
A current I₀ flows through a metallic circular loop of radius r as shown in the figure. Resistance of the segment ABC is half that of ADC. Magnitude of magnetic field at the centre O of the loop is :
A
μ₀I₀/12r
B
μ₀I₀/4r
C
μ₀I₀/2r
D
μ₀I₀/2πr
22
A thin horizontal disc is rotating about a vertical axis passing through its fixed centre O. Its angular momentum is LA and LB computed about points A and B, respectively, with OB = 2 × OA. The value of LA/LB is :
A
1/4
B
1/2
C
1
D
2
23
The amount of carbon dioxide evolved upon complete combustion of 116 g of n-butane is (Given : atomic mass in amu H = 1, C = 12 and O = 16)
A
352 g
B
322 g
C
176 g
D
362 g
24
Given below are two statements:
Assertion (A): Abscission tortoise in Galapagos Islands became extinct within a decade after goats were introduced.
Reason (R): Goats were more efficient at browsing than Aldabra tortoise. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is not the correct explanation of A.
C
A is correct but R is incorrect.
D
A is not correct but R is correct.
25
A conducting loop of finite resistance lies on the x-y plane. There is a constant magnetic field in the z direction. The area of the loop varies with time t, as A = A₀ (1 + sin t) in appropriate units. The figure that correctly indicates the qualitative behaviour of the power P dissipated in the loop as a function of time is :
A
(1)
B
(2)
C
(3)
D
(4)
26
A ray of light with wavelength λ is incident on three different photo-electric cells namely 1, 2 and 3. The threshold wavelength of these photo-electric cells are λ₁, λ₂ and λ₃, respectively and the magnitude of stopping potentials of these cells are V₁, V₂ and V₃, respectively. The relation between λ and threshold wavelengths are λ₁ < λ, λ₂ > λ and λ₃ >> λ. The correct option is :
A
V₁ = 0, V₂ < V₃
B
V₁ = 0, V₂ > V₃
C
V₁ > V₂, V₃ = 0
D
V₁ < V₂, V₃ = 0
27
How many molecules of pyruvic acid are produced at the end of glycolysis from 260 molecules of glucose?
A
206
B
2309
C
103
D
412
28
The PCR primers bind to the DNA strands in the ________ step.
A
denaturation
B
extension
C
annealing
D
ligation
29
Three identical capacitors P, Q and S, each of the capacitance C, are connected to a battery of voltage V, as shown in the figure. If the energy stored in the capacitor P and total energy stored in the system are UP and UT, respectively, then the ratio UP/UT is :
A
2/3
B
1/3
C
1/2
D
1/6
30
Consider the following nuclear reaction : ²³⁸U → ²³⁴Th + ⁴He Take masses of ²³⁸U, ²³⁴Th and ⁴He as 238.050 u, 234.043 u and 4.003 u, respectively. The Q value for the reaction, in keV, is : [Given : 1 u = 931.5 MeV c⁻²]
A
3726
B
3730
C
3736
D
3740
31
A car travels on a circular racetrack of radius 50 m, which is banked at an angle θ. If the car travels at a speed 10 ms⁻¹, then the wear and tear on its tyres is minimum. Taking the acceleration due to gravity to be 10 ms⁻², the value of θ is :
A
tan⁻¹(1/5)
B
tan⁻¹(2/5)
C
tan⁻¹(√3/2)
D
tan⁻¹(2√3)
32
Sphenopsida class belongs to ________.
A
bryophytes
B
angiosperms
C
gymnosperms
D
pteridophytes
33
Consider a fixed uniformly charged insulating sphere with radius R and total charge +Q. A point charge −q (q << Q) with mass m is released from rest at a distance of 3R from the centre of the charged sphere. When the point charge reaches the surface of the sphere, its speed is : (ε₀ is the permittivity of vacuum, neglect gravitational forces).
A
√(3Qq/4πɛ₀mR)
B
√(2Qq/3πɛ₀mR)
C
√(Qq/3πɛ₀mR)
D
√(Qq/4πɛ₀mR)
34
The lanthanide ion having four unpaired electrons is (Given : Atomic number of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)
A
Nd³⁺
B
Ce³⁺
C
Tb³⁺
D
Ho³⁺
35
Cell theory was formulated by ________.
A
Schleiden and Schwann
B
Robert Brown
C
Singer and Nicolson
D
Antonie Van Leeuwenhoek
36
Given below are two statements: Assertion (A): The large growth model of populations is considered more realistic than the exponential growth model. Reason (R): Resources are finite. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is not the correct explanation of A.
C
A is correct but R is incorrect.
D
A is not correct but R is correct.
37
Which of the following is not a prokaryote?
A
Bacteria
B
Blue green algae
C
Mycoplasma
D
Fungi
38
An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and f number of vibrational modes. If the ratio of heat capacities Cp/Cv of the gas is 8/7, then the value of f is :
A
4
B
3
C
3
D
1
39
Match List-I with List-II. List-I A. Excess growth hormone B. Luteinizing hormone C. Vasopressin D. Oxytocin List-II I. Reabsorption of water and electrolytes in kidney II. Contraction of uterus during childbirth III. Acromegaly IV. Ovulation Choose the correct answer from the options given below.
A
A-III, B-IV, C-II, D-I
B
A-II, B-IV, C-I, D-II
C
A-III, B-IV, C-I, D-II
D
A-IV, B-III, C-I, D-II
40
Consider a long solenoid of length l and radius r. If n is the number of turns per unit length and μ₀ is the permeability of free space, the inductance of the solenoid is :
A
μ₀πn²r²l
B
μ₀n²r²l
C
(μ₀/2π)n²r²l
D
2μ₀πn²r²l
41
The following table presents the part of the electromagnetic spectrum and their corresponding major applications. The correct option is :
A
P-I, Q-II, R-III, S-IV
B
P-I, Q-IV, R-II, S-III
C
P-II, Q-I, R-IV, S-III
D
P-II, Q-IV, R-III, S-I
42
The number of action potentials generated by parasympathetic nerve in a healthy human is ________ per minute.
A
28–30
B
70–75
C
100–110
D
120–140
43
Which of the following statements is incorrect?
A
Blood coagulates in response to an injury.
B
Blood clot consists of fibrin.
C
Fibrin is produced from fibrinogen.
D
Fibrinogen is produced from fibrin.
44
One mole of an ideal monatomic gas undergoes a cyclic process as shown in the figure. The total heat supplied to the gas is :
A
400 J
B
500 J
C
600 J
D
800 J
45
The association between fungi and algae are called ________.
A
lichens
B
sponges
C
mushroom
D
bryophytes
46
In the measurement of viscosity of liquids using terminal velocity experiment, spherical balls of same radius but having different densities are used. The variation of the terminal velocity (v) with the ratio of density of spherical ball (σ) to density of the liquid (ρ), is best represented by :
A
(1)
B
(2)
C
(3)
D
(4)
47
Water flows in a streamline motion through a horizontal pipe of circular cross-section as shown in the figure. The pressure difference of water between P and Q is 15 Nm⁻². The area of cross-section at P and Q are 40 cm² and 20 cm², respectively. The rate of flow of water through the pipe, in cm³ s⁻¹, is : [Take density of water = 1000 kg m⁻³]
A
100
B
200
C
300
D
400
48
Which of the following is not a part of human central nervous system?
A
Arachnoid
B
Dura mater
C
Pia mater
D
Pericardium
49
Genus represents ________.
A
an individual plant or animal
B
a population of plants and animals
C
a group of closely related species
D
a group of closely related families
50
Match List-I with List-II. [Image Here] Choose the correct answer from the options given below:
A
AI, BII, CIV, DIII
B
AII, BI, CIV, DIII
C
AIII, AII, BI, CIII, DIV
D
AI, BI, CII, DIV
51
Phyllotaxy is the pattern of arrangement of ____.
A
leaves
B
flowers
C
fruits
D
sepals
52
A photon and an electron, each of 20 eV energy, move in free space. The ratio of linear momentum of electron pe to that of photon pPh, pe/pPh is : (Take speed of light = 3 × 10⁸ ms⁻¹, charge of electron = −1.6 × 10⁻¹⁹ C and mass of electron = 9 × 10⁻³¹ kg)
A
2/450
B
1/250
C
225
D
275
53
Match the species in List-I with their geometry in List-II List-I A. PCl₅ B. BrF₅ C. BF₄⁻ D. [Ni(CN)₄]²⁻ List-II I. Tetrahedral II. Square Planar III. Trigonal bipyramidal IV. Square pyramidal Choose the correct answer from the options given below:
A
A-IV, B-III, C-I, D-II
B
A-III, B-IV, C-I, D-II
C
A-III, B-I, C-II, D-IV
D
A-III, B-II, C-I, D-IV
54
One main scale division of a Vernier calliper is equal to 1 mm and the number of divisions on the Vernier scale is 10. When both the jaws touch each other, the Vernier scale shifts to the left of zero of the main scale in such a way that 4th Vernier division coincides with a division of the main scale. If this Vernier calliper measures the length of a wire to be 1 cm, the actual length of the wire is :
A
0.60 cm
B
0.96 cm
C
1.00 cm
D
1.04 cm
55
The opening between the right atrium and the right ventricle is guarded by ________.
A
bicuspid valve
B
tricuspid valve
C
semilunar valve
D
sinoatrial node
56
How many theca are present in each lobe of a typical dicot angiosperm anther?
A
2
B
6
C
8
D
12
57
Three identical p-n junction diodes D₁, D₂ and D₃ are connected across a battery as shown in the figure. If the width of the depletion regions of D₁, D₂ and D₃ are W₁, W₂ and W₃, respectively, then the correct option is :
A
W₁ > W₂ > W₃
B
W₃ = W₁ > W₂
C
W₃ > W₂ > W₁
D
W₂ > W₁ = W₃
58
Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the egg?
A
Antipodals
B
Synergids
C
Central cells
D
Polar nucleus
59
A population of diploid organisms is at Hardy-Weinberg equilibrium. If the frequency of allele A is 0.1, the frequency of AA is ________.
A
0.01
B
0.02
C
0.10
D
0.99
60
Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, +α, while the other one has a negative temperature of coefficient, −α, as shown in the figure. The current through these circuits are denoted by IA and IB. At initial temperature, the resistance of the two resistors is R₀. As the temperature is increased, the correct option that describes the variation of current in these circuits is :
A
IA remains constant while IB increases
B
IA decreases while IB increases
C
IA increases while IB decreases
D
both IA and IB remain constant
61
Which of the following disease is not sexually transmitted?
A
Syphilis
B
Tuberculosis
C
Gonorrhoea
D
Genital warts
62
Which of the following hormone is not secreted by human placenta?
A
hCG
B
Estrogen
C
Progesterone
D
LH
63
The standard electrode potential (E°) for the half-cell reaction Fe³⁺ + e⁻ → Fe²⁺ at 298 K is (Given : E°(Fe³⁺/Fe) = −0.04 V and E°(Fe²⁺/Fe) = −0.44 V at 298 K)
A
+0.40 V
B
+0.76 V
C
−0.48 V
D
+0.92 V
64
For a salt XY, which is a strong electrolyte, the plot of Λm versus √c has a slope of −90.0 S cm² mol⁻³ᐟ² L¹ᐟ² at 298 K. At 0.01 M concentration of XY, the values of Λm is 145.S cm² mol⁻¹. The limiting molar conductivity of Y⁻ ion (λ°Y⁻, in S cm² mol⁻¹) at 298 K will be (Given : λ°X⁺ = 74.0 S cm² mol⁻¹)
A
80.0
B
100.0
C
90.0
D
76.0
65
Given below are two statements: Statement I: Ovulation is caused by LH surge leading to rupture of Graafian follicles. Statement II: Graafian follicle remaining after ovulation transforms into corpus luteum and secretes large amount of estrogen. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
66
Two infinitely long parallel conducting wires A and B carry currents I and 2I, respectively, in the same direction. The wire A has uniform mass per unit length λ and lies on an insulated floor. The wire B is kept fixed at a height h above the floor. The minimum magnitude of h so that the wire A does not rise from the floor is : [g is the acceleration due to gravity and μ₀ is the permeability of free space]
A
μ₀I²/2πλg
B
μ₀I²/πλg
C
2μ₀I²/πλg
D
4μ₀I²/πλg
67
Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?
A
Abscisic acid
B
Gibberellin
C
Indole butyric acid
D
Ethephon
68
Which of the following are secondary lymphoid organs? (a) Bone marrow (b) Tonsils (c) Spleen (d) Thymu Choose the correct answer from the options given below.
A
(a) and (b) only
B
(b) and (c) only
C
(b) and (d) only
D
(a) and (d) only
69
Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of ΔSSystem and ΔSSurroundings are (R is universal gas constant)
A
ΔSSystem = 0; ΔSSurroundings = 0
B
ΔSSystem = 4.606R; ΔSSurroundings = −4.606R
C
ΔSSystem = 0; ΔSSurroundings = 4.606 R
D
ΔSSystem = 4.606R; ΔSSurroundings = 0
70
The following carbocation is stabilized by the interaction of the empty p orbital with
A
filled σ and filled π orbitals
B
empty σ and empty π* orbitals
C
empty σ* and filled π orbitals
D
empty σ* and empty π* orbitals
71
The correct order of solubility of the given salts in water at 298 K is
A
Hg₂Cl₂ > Zn(OH)₂ > AgBr
B
AgBr > Zn(OH)₂ > Hg₂Cl₂
C
Hg₂Cl₂ > AgBr > Zn(OH)₂
D
Zn(OH)₂ > AgBr > Hg₂Cl₂
72
Given below are two statements : Statement-I : trans-But-2-ene upon treatment with Br₂ in CCl₄ gives the following product. Statement-II : cis-But-2-ene upon treatment with alkaline KMnO₄ gives the following product. In the light of the above statements, choose the most appropriate answer from the options given below:
A
Both Statement-I and Statement-II are correct.
B
Both Statement-I and Statement-II are incorrect.
C
Statement-I is correct but Statement-II is incorrect.
D
Statement-I is incorrect but Statement-II is correct.
73
Match the vitamins in List-I with their sources in List-II. List-I A. Vitamin A B. Vitamin B₁₂ C. Vitamin E D. Vitamin K List-II I. Meat II. Sunflower oil III. Green leafy vegetables IV. Carrots Choose the correct answer from the options given below.
A
A-II, B-III, C-IV, D-I
B
A-IV, B-I, C-II, D-III
C
A-IV, B-II, C-I, D-III
D
A-III, B-I, C-IV, D-II
74
Assertion A: For an ideal solution formed by mixing liquids P and Q, ΔmixH = 0 and ΔmixV = 0 Reason R: No interactions occur between P and Q In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are correct but R is NOT the correct explanation of A
C
A is correct but R is not correct
D
A is not correct but R is correct
75
Match List-I with List-II. List-I A. Fusion of protoplasms between gametes B. Fusion of two nuclei C. Generation of haploid spores List-II I. Meiosis II. Plasmogamy III. Karyogamy Choose the correct answer from the options given below.
A
A-I, B-III, C-I
B
A-II, B-I, C-I
C
A-II, B-III, C-I
D
A-I, B-II, C-II
76
Which of the following plant growth regulator is used as herbicide?
A
2,4-D
B
Kinetin
C
Abscisic acid
D
Gibberellin
77
Consider a particle moving along a straight line, whose position as a function of time is given by s(t) = αt² − βt + γ, where α = 1 ms⁻², β = 6 ms⁻¹ and γ = 5 m. The average speed of the particle, in ms⁻¹, from t = 0 to t = 6 s is :
A
12
B
6
C
3
D
0
78
One of the products formed in the following reaction is
A
Option A)
B
Option (B)
C
Option (C)
D
Option (D)
79
In Geiger-Marsden experiment, the number scattered α-particles N(θ) is plotted as a function of scattering angle θ. Which of the following options represent the correct plot ?
A
(1)
B
(2)
C
(3)
D
(4)
80
The correct decreasing order of oxidation state of the underlined atom in each molecule is
A
P₄O₁₀ > SO₃ > H₂O
B
N₂O₅ > Al₂O₃ > H₂S
C
PbO₂ > N₂O₃ > SO₃
D
P₄O₆ > Cl₂O₇ > AlH₃
81
Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. w₁, w₂, w₃ and w₄ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively. ΔU₂ and ΔU₄ are changes in the internal energy for the processes 2 and 4, respectively. (use R = 2 cal K⁻¹ mol⁻¹) The correct option is
A
w₁ + w₃ = −2T₁ ln(V₂/V₁) − 2T₂ ln(V₄/V₃)
B
w₂ + w₄ = ΔU₂ − ΔU₄
C
w₁ + w₂ = 2T₁ ln(V₂/V₁)
D
w₁ + w₂ + w₃ + w₄ = 0
82
In host endoplasmic reticulum ________.
A
has ribosomes attached to its surface
B
is the major site for the synthesis of lipids
C
is actively involved in protein synthesis
D
is a site for the synthesis of carbohydrates
83
Given below are two statements: **Statement-I :** Oxidation of p-nitrotoluene with acidic KMnO₄ gives an acid that is stronger than benzoic acid. **Statement-II :** Reduction of p-nitrotoluene with Sn/HCl followed by neutralization gives an amine that is more basic than aniline. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement-I and Statement-II are correct.
B
Both Statement-I and Statement-II are incorrect.
C
Statement-I is correct but Statement-II is incorrect.
D
Statement-I is incorrect but Statement-II is correct.
84
Given below are two statements: Statement I: Chromosomes are fully condensed at the end of prophase. Statement II: Nuclear membrane dissolves during prophase. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are true.
B
Both Statement I and Statement II are false.
C
Statement I is correct, but Statement II is false.
D
Statement I is incorrect, but Statement II is true.
85
Which of the following statements regarding photorespiration are correct? (a) Do not occur in C₃ plants (b) CO₂ is consumed and O₂ is generated (c) Phosphoglycolate is formed (d) No synthesis of ATP and NADPH Choose the correct answer from the options given below.
A
(a) and (d) only
B
(c) and (d) only
C
(b) and (d) only
D
(a) and (b) only
86
Endomembrane system includes ________.
A
endoplasmic reticulum, Golgi complex, lysosomes and vacuole
B
endoplasmic reticulum, chloroplast, peroxisomes and vacuole
C
mitochondria, chloroplast, peroxisomes and vacuole
D
Golgi complex, chloroplast, peroxisomes and vacuole
87
Choose the correct answer from the options given below.
A
A and B only
B
B and D only
C
A and C only
D
C and D only
88
Given below are two statements: Assertion (A): Forelimbs of human and bats are homologous. Reason (R): Forelimbs of humans and bats have similar anatomical structure. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.
89
Match List-I with List-II. List-I A. Spherical B. Rod C. Comma D. Spirillum List-II I. Vibrio II. Cocci III. Spirilla IV. Bacilli Choose the correct answer from the options given below.
A
A-I, B-III, C-II, D-IV
B
A-II, B-III, C-I, D-IV
C
A-II, B-IV, C-I, D-III
D
A-I, B-IV, C-II, D-III
90
Arrange the following in descending order of number of species in the Amazonian rainforest. (a) Plants (b) Birds (c) Fishes (d) Invertebrates (e) Mammals Choose the correct answer from the options given below.
A
(d) > (b) > (a) > (e) > (c)
B
(d) > (a) > (c) > (b) > (e)
C
(b) > (e) > (a) > (c) > (d)
D
(b) > (a) > (d) > (c) > (e)
91
Given below are two statements: Assertion (A): Forelimbs of human and bats are homologous. Reason (R): Forelimbs of humans and bats have similar anatomical structure. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.
92
Sperm motility is due to ________.
A
flagellar movement
B
ciliary movement
C
amoeboid movement
D
muscular movement
93
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Generally, 3d transition metals have high melting points. Reason R : Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below:
A
Both A and R are correct and R is the correct explanation of A
B
Both A and R are correct but R is NOT the correct explanation of A
C
A is correct but R is not correct
D
A is not correct but R is correct
94
The complex which has facial and meridional isomers is (Given: py = pyridine and en = H₂N–CH₂–CH₂–NH₂)
A
[Cr(py)₃(Cl)₃]
B
[Cr(H₂O)₆]³⁺
C
[Co(NH₃)₄(H₂O)₂]³⁺
D
[Ni(en)₂(H₂O)₂]²⁺
95
Arrange the following taxonomic categories in ascending order. (a) Genus (b) Order (c) Family (d) Species (e) Class (f) Phylum (g) Kingdom Choose the correct answer from the options given below.
A
(d), (a), (c), (b), (e), (f), (g)
B
(d), (a), (b), (c), (e), (f), (g)
C
(g), (f), (e), (b), (c), (a), (d)
D
(f), (c), (b), (a), (d), (e), (g)
96
A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to N ⇌ D. At 60 °C, the concentrations of both N and D are equal at equilibrium, and the standard enthalpy change of denaturation is 666 kJ mol⁻¹. The standard entropy change (ΔS° in kJ K⁻¹ mol⁻¹) of the protein upon denaturation at 60°C is closest to
A
2.0
B
2000.0
C
333.0
D
11.1
97
Colostrum, secreted by mother during initial days of lactation, is abundant in ________.
A
IgG
B
IgM
C
IgA
D
IgD
98
The method of directly injecting a sperm into ovum is assisted reproductive technology called:
A
Gamete intra fallopian transfer (GIFT)
B
Zygote intra fallopian transfer (ZIFT)
C
Intra cytoplasmic sperm injection (ICSI)
D
Embryo transfer (ET)
99
The number of vertebrae in a human is ________.
A
26
B
12
C
36
D
206
100
Colostrum, secreted by mother during initial days of lactation, is abundant in ________.
A
IgG
B
IgM
C
IgA
D
IgD
101
A point charge Q is placed inside a cavity within a solid isolated conducting sphere. Consider points A, B and C as shown in the figure, where the magnitudes of the electric fields are EA, EB and EC, respectively. The points B and C are at the same distance from the center of the solid sphere. The correct option is :
A
EA = 0, EB = EC
B
EA ≠ 0, EB = EC
C
EA = 0, EB > EC
D
EA ≠ 0, EB < EC
102
For sound waves, if the number of nodes for the 5th harmonic of an open-ended pipe is n and that for the 9th harmonic of the same pipe with one of its ends closed is m, the ratio n/m is :
A
5/9
B
9/5
C
1
D
3/5
103
Mad cow disease is caused by ____.
A
prions
B
viroids
C
Aspergillus sp.
D
Mycoplasma sp.
104
A cylindrical cork of uniform density floats in a liquid of density ρ₁. If the cork is depressed slightly and released, it oscillates harmonically with time period T. If the same cork floats in another liquid of density ρ₂, then the similar oscillation has time period 2T. The value of ρ₂/ρ₁ is :
A
4
B
2
C
1/2
D
1/4
105
Which of the following plant produces nonalbuminous seeds?
A
Wheat
B
Maize
C
Barley
D
Pea
106
Which of the following hormone is not secreted by human placenta?
A
hCG
B
Estrogen
C
Progesterone
D
LH
107
Which of the following enzymes synthesizes precursor mRNA?
A
RNA polymerase I
B
RNA polymerase II
C
RNA polymerase III
D
DNA polymerase
108
Which of the following are characteristic features of Solanaceae family? (a) Flowers are bisexual and actinomorphic (b) Calyx has five sepals and are united (c) Androecium have five stamens and are epipetalous (d) Ovary is inferior Choose the correct answer from the options given below.
A
(a), (b) and (c) only
B
(d) only
C
(a) and (b) only
D
(a), (b), (c) and (d)
109
Match List-I with List-II. [List-I] A. Cristae B. Cisternae C. Thylakoids D. Phospholipid [List-II] I. Flat membrane sacs in stroma of chloroplast II. Infoldings in mitochondria III. Cell membrane IV. Disc-shaped sacs in the Golgi apparatus Choose the correct answer from the options given below:
A
A-II, B-IV, C-I, D-III
B
A-II, B-IV, C-I, D-II
C
A-II, B-IV, C-III, D-I
D
A-IV, B-III, C-I, D-II
110
The plastid that stores xanthophyll is known as ________.
A
chloroplast
B
chromoplast
C
aleuroplast
D
amyloplast
111
A unit positive point charge is taken slowly through an infinitesimally thin tube that is inside a charged dielectric sphere of radius R, having uniform positive charge density ρ, as shown in the figure. The initial and final positions of the charge are marked by A and B at distances 2R and 3R respectively, from the centre of the sphere. In this process, the magnitude of the total work done on the point charge is ρR²/nε₀. The value of n is : (ε₀ is the permittivity of vacuum)
A
2
B
6
C
9
D
18
112
Given below are two statements: Statement I: In gymnosperms, the male and female gametophytes remain within the sporangia. Statement II: In gymnosperms, seeds are not contained in fruit. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
113
The temperature of a metallic sphere of radius R is increased by a small amount ΔT. If the linear coefficient of thermal expansion of the metal is α, the approximate increase in the volume of the sphere is :
A
2πR³αΔT
B
3πR³αΔT
C
4πR³αΔT
D
6πR³αΔT
114
Which pigments has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P700)?
A
Chlorophyll a
B
Chlorophyll b
C
Xanthophylls
D
Carotenoids
115
Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows, negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law. The correct option is
A
A and B only
B
B and C only
C
A only
D
A and C only
116
The formula of tetraammineaquachloridocobalt(III) chloride is
A
[Co(NH₃)₄Cl₂] × H₂O
B
[Co(NH₃)₄]Cl₃ × H₂O
C
[Co(NH₃)₄(H₂O)Cl]Cl
D
[Co(NH₃)₄(H₂O)Cl]Cl₂
117
Consider the following reaction, and choose the correct option.
A
On treating compound **P** with saturated NaHCO₃ solution, brisk effervescence is observed.
B
Compound **P** can be prepared by treating benzene with anhydrous AlCl₃ and CH₃COCl.
C
On treatment with bromine water, compound **P** gives a white precipitate.
D
Compound **P** is obtained by the hydrogenation of benzoyl chloride with Pd on BaSO₄.
118
Given below are two statements: Assertion (A): Abscission tortoise in Galapagos Islands became extinct within a decade after goats were introduced. Reason (R): Goats were more efficient at browsing than Aldabra tortoise In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is not the correct explanation of A.
C
A is correct but R is incorrect.
D
A is not correct but R is correct.
119
Which of the following structure is not a part of the male reproductive system?
A
Rete testis
B
Epididymis
C
Vasa efferentia
D
Infundibulum
120
The highest occupied molecular orbital for Ne₂ is
A
π₂p
B
σ₂p
C
π*₂p
D
σ*₂p
121
For the following reaction sequence, choose the correct option
A
If P is the sodium salt of a carboxylic acid, Q is a primary alcohol.
B
P and Q are aromatic compounds.
C
If P gives a carboxylic acid on acidification, Q gives a poisonous gas on exposure to air and light.
D
Both P and Q are carbonyl compounds.
122
A frictionless circular wire of unit radius is fixed on the horizontal plane. Two point particles of unit mass start moving simultaneously from point A (θ = π/2) with identical uniform angular speeds in opposite directions, and meet again at point B (θ = −π/2). During this time, which of the following figures schematically represent the magnitude of the total linear momentum P of the system, as a function of θ ?
A
(1)
B
(2)
C
(3)
D
(4)
123
Which one of the following statements is incorrect?
A
α cells of pancreas secrete glucagon.
B
α cells of pancreas secrete insulin.
C
Glucagon stimulates glycogenolysis.
D
β cells of pancreas secrete insulin.
124
Sponges exchange O₂ with O₂ by ________.
A
simple diffusion over their entire body surfaces
B
moist cuticle
C
tracheal tubes
D
gills
125
A beam of light falls on a metal surface such that photo-electrons are generated. If power of the light source starts to decrease linearly with time t, then variation of the photocurrent I and magnitude of the stopping potential |V| with time is best represented by :
A
(1)
B
(2)
C
(3)
D
(4)
126
Consider a spring mass simple harmonic oscillator in one dimension. The mass of the particle is m kg and the spring constant is k Nm⁻¹. At a given instant, the extension of the spring is x meter and the speed of the particle is v ms⁻¹. On the x-v plane, if the graph of v as a function of x is a circle, then the correct option is :
A
k = 1/m
B
k = m
C
k = m²
D
k = √m
127
How many turns of Calvin cycle are required for the formation of three molecules of glucose?
A
6
B
3
C
1
D
18
128
Two planets P₁ and P₂ with equal mass have radii R₁ and R₂, respectively, where R₂ = R₁/2. The escape speeds of P₁ and P₂ are v₁ and v₂, respectively. Then v₂/v₁ is :
A
1/√2
B
1
C
√2
D
2
129
Among the species given below, the spin only magnetic moment is highest for (Given : Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)
A
[Mn(CN)₆]³⁻
B
[Fe(CN)₆]³⁻
C
[Co(NH₃)₆]³⁺
D
[Ti(H₂O)₆]³⁺
130
If the diploid chromosome number of a typical angiosperm is 36, what would be the chromosome number in its endosperm?
A
18
B
36
C
54
D
72
131
Natural selection can lead to ________. (a) stabilisation (b) genetic drift (c) directional change (d) disruption Choose the correct answer from the options given below.
A
(a) only
B
(a), (c) and (d) only
C
(b), (c), (d) and (a)
D
(a) and (c) only
132
Mitochondrial inner membrane encloses ________.
A
matrix
B
cytosol
C
mucus
D
aqueous humour
133
Which of the following statements about the absorption process in Henle's loop are correct? (a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes. (b) Urine gets concentrated in Henle's loop. (c) Reabsorption of Na⁺ and water takes place in Henle's loop. (d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop. Choose the correct answer from the options given below.
A
(a) and (b) only
B
(b), (c) and (d) only
C
(a), (d) and (c) only
D
(a), (b) and (d) only
134
In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO₄ solution. If the volume of KMnO₄ solution required to reach end point is 10 mL, the strength of the KMnO₄ solution is
A
0.10 M
B
0.20 M
C
0.25 M
D
0.15 M
135
The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are
A
17.014 and 21.023
B
17.015 and 21.023
C
17.014 and 21.024
D
17.015 and 21.024
136
Given below are two statements: Statement-I : [Fe(ox)₃]³⁻ is chiral. Statement-II : trans-[Cr(H₂O)₂(ox)₂]⁻ is chiral. (Given : oxH₂ = HOOC–COOH) In light of the above statements, choose the most appropriate answer from the options given below:
A
Both Statement-I and Statement-II are correct.
B
Both Statement-I and Statement-II are incorrect.
C
Statement-I is correct but Statement-II is incorrect.
D
Statement-I is incorrect but Statement-II is correct.
137
In an adiabatic expansion, the temperature of one mole of an ideal monatomic gas (γ = 5/3) decreases from 60 K to 50 K. The work done by the gas in the process is : [Take the universal gas constant as R = 8.3 J mol⁻¹ K⁻¹]
A
41.5 J
B
83 J
C
124.5 J
D
166 J
138
Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is ________.
A
1 million
B
5 million
C
10 million
D
100 million
139
Which of the following statements about lac operon is correct?
A
Gene I is constitutively expressed.
B
Lactose activates repressor to bind to the operator.
C
Genes i, z, y and a share a single common promoter.
D
Galactose can act as an inducer of lac operon.
140
An ideal Zener diode with breakdown voltage of −3V is reverse biased with a negative input voltage Vi = −5V. The magnitude of voltage difference between points B and A is :
A
3 V
B
2 V
C
1 V
D
0 V
141
An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant εr = 9, has the electric field, Ex = E₀ sin (kz − 2π × 10⁶t) Vm⁻¹ where E₀ is the amplitude and k is the wave vector. Among the following options, the incorrect choice is :
A
The speed of the electromagnetic wave inside the medium is 10⁸ ms⁻¹
B
The wavelength of the electromagnetic wave inside the medium is 300 m
C
The magnetic field is given by the relation By = B₀/v sin (kz − 2π × 10⁶t) where v is the speed of the electromagnetic wave inside the medium
D
The direction of propagation of the electromagnetic wave is along +z
142
Given below are two statements: Statement I: Down's syndrome is caused by the absence of one of the X chromosomes. Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes. In the light of the above statements, choose the correct answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement II is correct but Statement I is incorrect.
143
The correct sequence of adult cell cycle phases is ________.
A
G1-G2-S-M
B
G1-M-G2-S
C
G1-S-G2-M
D
S-M-G2-G1
144
For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?
A
Father: IAi and Mother: ii
B
Father: IBi and Mother: ii
C
Father: IAi and Mother: IBi
D
Father: IAIA and Mother: ii
145
Adaptive radiation in placental mammals and Australian marsupials leading to similarity between distant species is an example of ________.
A
divergent evolution
B
convergent evolution
C
founder effect
D
genetic drift
146
Which of the following measurements require 'index correction'?
A
Measurement of resistance of a wire using meter bridge
B
Measurement of gravitational acceleration using simple pendulum
C
Measurement of focal length of lenses using optical bench
D
Measurement of speed of sound using resonance tube
147
Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans?
A
Femur-fibula-patella-tarsal
B
Patella-femur-tibia-tarsal
C
Femur-patella-tibia-tarsal
D
Femur-tarsal-patella-tibia
148
Consider that σs, kB, b represent Stefan-Boltzmann constant, Boltzmann constant and Wien's displacement law constant, respectively. The dimension of σskB⁻¹b is :
A
[L⁻¹T⁻¹K⁻²]
B
[L⁻¹K⁻²]
C
[L⁻¹T⁻¹K⁻³]
D
[L⁻¹T⁻¹K⁻⁴]
149
Match List-I with List-II.List-I A. Family B. Genus C. Class D. Phylum E. Order List-II I. Sapindales II. Dicotyledonae III. Anacardiaceae IV. Angiospermae V. Mangifera Choose the correct answer from the options given below.
A
A-I, B-V, C-II, D-IV, E-III
B
A-II, B-I, C-III, D-IV, E-V
C
A-III, B-V, C-II, D-IV, E-I
D
A-III, B-V, C-II, D-I, E-IV
150
Given below are two statements: Statement I: The class name Reptilia refers to creeping or crawling mode of locomotion. Statement II: All organisms belonging to Reptilia have three chambered heart. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement II is correct but Statement I is incorrect.
151
Which of the following is the correct order of arrangement of vertebral column from the head to toe?
A
Cervical vertebra, thoracic vertebra, sacrum, lumbar vertebra
B
Sacrum, lumbar vertebra, thoracic vertebra, cervical vertebra
C
Cervical vertebra, lumbar vertebra, thoracic vertebra, sacrum
D
Cervical vertebra, thoracic vertebra, lumbar vertebra, sacrum
152
Given below are two statements: Statement I: Plasmids are autonomously replicating DNA. Statement II: Plasmids are extrachromosomal DNA. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
153
In a solar system, the time-period of revolution of a planet tracing a circular orbit of radius R is proportional to :
A
R¹ᐟ²
B
R³ᐟ²
C
R²
D
R³
154
Which of the following is not evidence for evolution?
A
Convergent evolution of traits like wings of birds and butterflies
B
Palaeontological evidence from fossil records
C
Embryological support for evolution as proposed by Ernst Haeckel
D
Divergent evolution of anatomical structures such as forelimbs
155
An ac voltage V = 220 sin (2 × 10³t) Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is : (Given : L = 10 mH, C = 25 μF, R = 100 Ω)
A
2.2 A
B
5.5 A
C
11.0 A
D
22.0 A
156
Consider three media P, Q and R with refractive indices 1, 1.25, and 1.5, respectively. The medium Q having a thickness of 5 cm is placed between extended media P and R as shown in the figure. An object O is placed at the centre of medium Q. If viewed from medium P near the normal direction, the apparent depth of O is h₁. For similar observation from medium R, the apparent depth is h₂. The value of |h₁ − h₂|, in cm, is :
A
0
B
1
C
2
D
3
157
Photorespiration reaction catalyzed by RuBisCO is shown below. [Image Here] RubP + O₂ + 3-Phosphoglycerate + X Identify 'X' from the given options:
A
Phosphoenolpyruvate
B
2-Phosphoglycolate
C
Oxaloacetate
D
Malate
158
In water, frogs respire using ____.
A
skin
B
buccal cavity
C
lungs
D
trachea
159
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy of O is lower than that of N and F. Reason R : The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:
A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is NOT the correct explanation of A.
C
A is correct but R is not correct.
D
A is not correct but R is correct.
160
Given below are two statements: Statement I: Plasmids are autonomously replicating DNA. Statement II: Plasmids are extrachromosomal DNA. In the light of the above statements, choose the most appropriate answer from the options given below.
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
161
Match List-I with List-II. List-I A. Marginal placentation B. Axile placentation C. Parietal placentation D. Free central placentation List-II I. Argemone II. Tomato III. Primrose IV. Pea Choose the correct answer from the options given below.
A
A-I, B-IV, C-II, D-III
B
A-IV, B-II, C-I, D-III
C
A-II, B-III, C-I, D-IV
D
A-IV, B-III, C-I, D-II
162
For an elementary chemical reaction, the Arrhenius plot is given below. If the energy of activation is 6.64 kJ mol⁻¹ and R = 8.3 J K⁻¹ mol⁻¹, the temperature at which the rate constant becomes e² min⁻¹, is
A
125 K
B
150 K
C
200 K
D
250 K
163
Which of the following statements related to pituitary gland are correct? (a) It is divided anatomically into adenohypophysis and neurohypophysis (b) It secretes follicle stimulating hormone (c) It secretes melanocyte stimulating hormone (d) It does not secrete prolactin Choose the correct answer from the options given below:
A
(a) and (b) only
B
(a), (b) and (c) only
C
(a) and (d) only
D
(b) and (c) only
164
Given below are two statements: Statement-I : Heating NaCl with concentrated H₂SO₄ and MnO₂ results in oxidation of Mn. Statement-II : Heating NaI with concentrated H₂SO₄ and MnO₂ results in reduction of Mn. In light of the above statements, choose the most appropriate answer from the options given below:
A
Both Statement-I and Statement-II are correct.
B
Both Statement-I and Statement-II are correct but Statement-II is NOT the correct explanation of Statement-I.
C
Statement-I is correct but Statement-II is incorrect.
D
Statement-I is incorrect but Statement-II is correct.
165
The lens combination as shown in the figure, consists of two lenses L₁ and L₂, of the focal lengths +10 cm and −10 cm, respectively. The position of the image formed is :
A
20 cm to the left of the concave lens
B
60 cm to the left of the concave lens
C
30 cm to the right of the concave lens
D
60 cm to the right of the concave lens
166
A particle of mass M moves along a horizontal x axis from x = 0 to x = L. The coefficient of kinetic friction varies as a function of x as μk(x) = μ0 − αx, where μ0, α are constants of appropriate dimensions, so that μk(L) = 0. The total work done by the frictional force during the motion is ημ0MgL, where g is the acceleration due to gravity. The value of η is :
A
3
B
1
C
1/3
D
1/2
167
Given below are two statements: Statement I: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Statement II: In phylum Echinodermata, both adults and larvae are radially symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below:
A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
168
A solid sphere A of radius R and mass M is attached at a point to a smaller solid sphere B of radius r < R and mass m < M. Assume that the line joining their centres lies along the horizontal. The moment of inertia of the system calculated about a vertical axis passing through the centre of A is IA and that calculated about a vertical axis passing through the centre of B is IB. The difference IA − IB is :
A
(M − m)(R + r)²
B
(m − M)(R + r)²
C
(m − M)(R − r)²
D
0
169
Which of the following enzymes synthesizes precursor mRNA?
A
RNA polymerase I
B
RNA polymerase II
C
RNA polymerase III
D
DNA polymerase
170
Bob B of mass m at rest is hanging vertically from the ceiling via a massless string of length 10 m, as shown in the figure. Point mass A of mass m travelling horizontally with speed 10 ms⁻¹ hits bob B elastically. The bob B rises h meter after the collision. Taking the acceleration due to gravity g = 10 ms⁻² and neglecting the size of the bob, the value of h is :
A
8
B
7
C
5
D
2.5
171
Which of the following are characteristics of prokaryotic cells? (a) Ribosomes are made of 50S and 30S subunits (b) They can have plasmids (c) They contain mesosome (d) They have peroxisomes Choose the correct answer from the options given below:
A
(b) and (c) only
B
(a) and (c) only
C
(a), (b) and (c) only
D
(a), (b), (c) and (d) only
172
Muscle contraction is initiated by a signal sent by the central nervous system by the release of ________.
A
acetyl choline
B
acetyl coenzyme A
C
cyclic guanosine monophosphate
D
cyclic adenosine monophosphate
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