PART TEST 12 For NEET 2021

1.Palmella stage is a response due to toxic chemicals and they appear in a mass of mucilage, found in-

2.spirullina and chlorella are respectively-

3.zoospores are absent in-

4.All of the following can be a part of Eukaryotic cell wall except-

5.which of the following bryophytes has advanced features like short-meristematic tissue?

6. Consider statement a, b, c, d for pteridophytes.

a. cones/strobili are sporophyte stage(2n)

b. all are homosporous except Selaginella and Lycopodium

c.  gametophyte is free-living but inconspicuous and bears antheridia, archegonia

d.  club moss belongs to pteridophytes

Which is/are true?

7.Followings are uses of pteridophytes.

a.  sphenophyte/equisetum stores silica in stem helps in scouring and polishing metals.

b. azolla is a fern of paddy plant with N2 fixation property.

   Choose correct statement/statements

8.Identical jacketed sex organ, first true land plant with vasculature is-

9.Assertion: Pteridophytes are precursor to the seed habit.

Reason: zygotes develop into embryo inside female gametophyte in case of heterosporous.

10.Consider statements a, b, c for Gymnosperms.

a.They have open vascular bundle with cambium

b.They have xylem without vessels and phloem without sieve tube, companion cell

c.They have dimorphic leaves

How many statements is/are true?

11.Male gametophyte is smallest for-

12.gametophytic(n) endosperm is found in-

13.A and B are two Pteridophytes which fix N2 and Phosphate respectively-

14.consider stamens regarding monocots.

a. Tap root system absent and short-lived adventitious system present.

b. scattered vascular bundle present

c. less undifferentiated tissues in stem and leaf in compared to dicot.

d. pith are absent

Which statements are true?

15.Which of the following plants have vessel in their xylem?

Pinus, Cycas, gnetum, Psilotum, equisetum, wolffia, Ginko

16.Zoospores are absent in-

17.This Single cell protein produced using spirulina. This is –

18.Which of the following is true about Funaria.

19.Find wrong about boron-

20. which is wrong about Cu?

21.Zn   is related with ‘x’ hormone and Zn deficiency causes ‘Y’? X and Y respectively

22.Hydrolysis during photosynthesis needs all except-

23.How calcium causes irregular cell division?

24.Marsh Spot in Pea is due to deficiency of

25.Chlorosis occur in absence of all except

26.which of the following is true regarding this plant –

27. Find mismatched values with respect to its definition-

28.A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called-

29.Thiobacillus helps in-

30.Photolysis of water during light reaction requires-

31.In which of the following, the oxidation number of Fe is +1?

32.H₂O₂changes Cr₂O₇^2-ion to CrO₅ in an acidic medium, the oxidation state of Cr in CrO₅ is

33.Concentrated H₂SO₄ acts as a strong oxidising agent. In which of the reactions, is it not acting as an oxidising agent?

34.One mole of ferrous oxalate is oxidized by how many moles of potassium permanganate in acid medium?

35.A compound of Xe and F is found to have 53.5% of Xe. What is the oxidation number of Xe in this compound? [Xe=131, F= 19]

36.Which of the following processes does not involve oxidation of iron?

37.One mole of N₂H₄ loses 10 moles of electrons to form a new compound y. Assuming that all nitrogen appears in the new compound, what is the oxidation state of nitrogen in y.

38.The equivalent mass of oxidising agent in the following reaction is

SO₂ + 2H₂S → 3S + 2H₂O

39.The equivalent weight of KIO₃ in the reaction 

2Cr(OH)₃ + 4O+ KIO₃ → 2Cr+ 5H₂O + KI

is

40.xNa₂HAsO₃ + yNaBrO₃ + zHCl → NaBr + H₃AsO₄ + NaCl

The values of x, y and z in the above redox reaction are respectively:

41.Which of the following is a redox reaction?

42.The electrode potential data are given below:

Fe³⁺ + e à Fe²⁺; E⁰=0.77V

Al³⁺ + 3e à Al; E⁰=-1.66V

Br₂ + 2e à 2Br^–; E⁰=1.80V

Based on the data, the reducing power of Fe²⁺,Al,Br^– will increase in the order

43.The number of moles of potassium permanganate reduced by one mole of potassium iodide in alkaline medium is

44.The oxidation number of sulphur in S₈, S₂F₂, H₂S respectively, are

45.Which of the following reactions is an example of a redox reaction?

46.This on reduction with LiAlH₄ produces secondary amine

47.Which of the following is formed in the reaction of an aldehyde and primary amine?

48.In the reaction shown below, the major product(s) formed

is/are  

49.The most basic compound among the following is

50.Carbylamine forms from aliphatic or aromatic primary amine via which of the following intermediates?

51.Predict about the relative boiling point of the following two

amines:

52.Which statement is true regarding the following structure?

53.Which reaction sequence would be best to prepare 3-chloroanilne from benzene?

54.Arrange the following amines in the order of increasing basicity.

55. Towards electrophilic substitution, the most reactive will be

56.The product (C) obtained in the following sequence of reactions

is

57.In the following reactions, the product S is

58.Ethyl isocyanide on hydrolysis in acidic medium generates

59.Tautomerism will be exhibited by

60.What is the product of the following series of reactions? 

61.Two slits in Young’s experiment have widths in the ratio 1:25. The ratio of intensity at the maxima and minima in the interference pattern I_max/I_min is 

62.At the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is

63.A beam of light of 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is

64.In the Young’s double-slit experiment, the intensity of light at a point on the screen (where the path difference is λ ) is K where λ being the wavelength of light used. The intensity at a point where the path difference is λ /4 will be 

65.A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following statements is correct?

66.Two ideal slits S₁ and S₂ are at a distance d apart, and illuminated by light of wavelength λ passing through an ideal source slit S placed on the line through S₂ as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is

67.Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that the 8^th bright fringe in the medium lies where the 5^th dark fringe lies in the air. The refractive index of the medium is nearly:-

68.A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 x 10^-5 cm. The distance of the first dark band of the diffraction pattern from the center of the screen is :

69. Unpolarised light is incident from the air on a plane surface of a material of refractive index ‘μ’. At a particular angle of incidence ‘i’, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

70.In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. Monochromatic light of wavelength 500nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?

71.A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?

72.The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is 

73.Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectric will reach the anode A, if the stopping potential of A relative to C is

74.When a metallic surface is illuminated with radiation of wavelength λλ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λλ, the stopping potential is V4V4 .The threshold wavelength for metallic surface is:

75.A radiation of energy ‘E’ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c=velocity of light)

76.A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photoelectric current for this light is 3V_o. If the same surface is illuminated with light of wavelength 2λ. the stopping potential is V_o. The threshold wavelength for this surface for the photoelectric effect is:

77.Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?

78.A photoelectric surface is illuminated successively by monochromatic light of wavelength  λ and λ/2.
If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the materiall is (h=Planck’s constant, c=speed of light)

79.Light of wavelength 500 nm is incident on a metal with work function 2.28 eV. The de-Broglie wavelength of the emitted electron is

80.In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

81. Light of two different frequencies whose photons have energies 1 eV and 2.5 eV

respectively illuminate a metallic surface  whose function is 0.5 eV successively.

Ratio of maximum speeds of emitted  electrons will be

82.Photoelectric emission occurs only when the incident light has more than a certain minimum 

83.Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be:

84. Frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg constant R and velocity of light C is:

85.Consider the spectral line resulting from transition n = 2 to n = 1 in the atoms and ions given below.  The shortest wavelength is given by

86.The valence electron in alkali metal is a

87.Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr’s atomic model:

88.Energy of an electron in an excited hydrogen atom is -3.4 eV. Its angular momentum will be (h = 6.626 ×× 10^-34 J-s)

89.As per Bohr model, the minimum energy (in eV) required to remove the electron from the ground state of double ionized lithium (Z=3) is 

90.The ratio of the energies of the hydrogen atom in its first to second excited states is