E2 II PART TEST 9 for NEET 2022

1.Two waves of intensity ratio 9:1 interfere to produce fringes in a young’s double-slit experiment, the ratio of intensity at maxima to the intensity at minima is

2.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 5×10^-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

3.For a parallel beam of monochromatic light of wavelength diffraction is produced by a single slit whose width ‘a’ is of the order of the wavelength of the light. If ‘D’ is the distance of the screen from the slit, the width of the central maxima will be

4.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- 

5.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

6.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

7.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

8.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?

9.Two coherent sources of light can be obtained by

10. If L is the coherence length and c the velocity of light, the coherent time is 

11.Which of the following statements indicates that light waves are transverse? 

12.Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π2π2 at point A and π at point B. Then the difference between the resultant intensities at A and B is 

13.In Young’s double slit experiment, the minimum amplitude is obtained when the phase difference of super-imposing waves is (where n = 1, 2, 3, …)

14.When a film is illuminated by white light, its upper portion appears dark. Path difference between two reflected beams at the spot must be

15.Unpolarized light is incident on a plane glass surface The angle of incidence so that reflected and refracted rays are perpendicular to each other, them

16.In the propagation of light waves, the angle between theplane of vibration and plane of polarisaiton is

17.Light of wavelength 6.5 × 10^–7 m is made incident on two slits 1 mm apart. The distance between third dark fringe and fifth bright fringe on a screen distant 1 m from the slits will be

18.In Young’s double slit expt. the distance between two sources is 0.1 mm. The distance of the screen from the source is 20 cm. Wavelength of light used is 5460 Å. The angular position of the first dark fringe is

19.The separation between successive fringes in a double slit arrangement is x. If the whole arrangement is dipped under water what will be the new fringe separation? [The wavelenght of light being used is 5000 Å]

20.: If the width of the slit in single slit diffraction experiment is doubled, then the central maximum of diffraction pattern becomes

21.Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in Fig. 10.1. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid

22.. Consider sunlight incident on a slit of width 10⁴ A. The image seen through the slit shall

23.Consider a ray of light incident from air onto a slab of glass (refractive index n) of width d, at an angle θ. The phase difference between the ray reflected by the top surface of the glass and the bottom surface is

which of the following answer is correct?

24.In a Young’s double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

25.Figure 10.2 shows a standard two slit arrangement with slits S₁, S₂. P₁, P₂ are the two minima points on either side of P (Fig. 10.2). At P₂ on the screen, there is a hole and behind P₂ is a second 2- slit arrangement with slits S₃, S₄ and a second screen behind them.

26.. A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that 

27.If the separation between screen and source is increased by 2% what would be the effect on the intensity :

28.Optically active substances are those substances which

29.In Young’s double-slit experiment, the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to:-

30.. A major breakthrough in the studies of cells came with the development of an electron microscope. This is because:

31.Which of the following statements is correct about Langmuir’s adsorption?

32.Which of the following is adsorbed greatly by activated charcoal?

33.Point out the incorrect statement from the following:

34.Vanishing cream is an example of,

35.Flocculation value is expressed in terms of,

36.The gold numbers of four protective colloids O, P, Q and R are 0.005, 0.01, 0. And 0.5 respectively. The decreasing order of their protective power is,

37.In aerosol, the dispersion medium is,

38.In preparation of AgI sol, the excess of AgNO3 is added to KI solution. The particles of the sol will acquire,

39.Which of the following method is not employed for the purification of colloids?

40.The stability of the dispersed phase in a lyophobic colloid is due to:

41.Metals like silver and gold can be obtained in the colloidal state by

12.The coagulation of 10 cc of Gold sol is completely prevented by addition of 0.025 g of starch into it. The gold number of starch is,

43.The stability of hydrophobic sol is due to,

44.Gelatin is often used as an ingredient in the manufacture of ice cream for,

45.Which type of molecules form micelles?

46.As₂S₂ sol is,

47.A colloidal solution is subjected to an electrical field. The particles move toward anode. The coagulation of same sol is studied using NaCl, BaCl₂ and AlCl₃ Their coagulating power should be,

48.For adsorption of a gas on a solid, the plot of log(x/m) vs. log P is linear with slope equal to:

49.The cause of Brownian movement is,

50.How many layers are adsorbed in chemical adsorption?

51.Which of the following kinds of catalysis can be explained by the adsorption theory?

52.At CMC the surfactant molecules,

53.The heat of adsorption in physisorption lies in the range (in kJ/mol),

54.Which of the following is an example of homogeneous catalysis?

55.Alum helps in purifying water by,

56.Although nitrogen does not absorb on the surface at the room temperature, it absorbs on the same surface at 83 K. Which one of the following statements is correct?

57.Plot of log(x/m) against log P is a straight line inclined at an angle 45^o. When the pressure is 0.5 atm and Freundlich parameter, k is 10.6, the amount of the solute adsorbed per gram of adsorbent will be (log5 = 0.0990),

58.Peptization is a process of,

59.Langmuir adsorption isotherm is deduced using assumption,

60.Adsorption of gases on solid surface is generally exothermic because,

61.Wuchereria bancrofti causes diseases in the following organ system

62.Which is the correct match?

3.Ringworm is caused by the pathogen Microsporum which belong to the same kingdom as

64.Antibiotics are secreted from

65.The basic constituent of antibodies are

66.Which of the following is associated with humoral immunity?

67.Which of the following can cross the placental barrier?

68.The most abundant immunoglobulin in human body is

69.Antibody formation is stimulated by

70.The genetic material of HIV is none other than

71.Aids is defined by

72.Which of the following is not a characteristic of Cancer cells?

73.Tobacco causes

74.Read the following statements and find the Incorrect one

75.Which of the following statement(s) is/are not correct?

76.Biotechnology research areas comprise all except?

77..Bt toxin is produced by a bacterium called Bacillus thuringiensis (Bt for short). This is used in the following plants fro the resistance to insects

78.The insecticidal agent of Bt toxin is

79.In the following image (a) is affected by?

80.Meloidegyne incognitia infects the roots of

81.Assertion: The introduction of DNA was such that it produced both sense and anti-sense RNA in the host cells.

Reason: Two RNA’s being complementary to each other formed a double stranded (dsRNA) that initiated RNAi and thus, silenced the specific mRNA

82.Insulin consists of

83.C peptide is present in

84.Eli Lilly an American company prepared two DNA sequences corresponding to A and B, chains of human insulin and introduced them into

85.The first clinical gene therapy was given in

86.Adenosine deaminase (ADA) is crucial for

87.Which of the following statement is correct?

88.Very low concentration of a bacteria or virus (at a time when the symptoms of the disease are not yet visible) can be detected by

89.____________ will make decisions regarding the validity of GM research and the safety of introducing GM-organisms for public services

90.In 1997, the first transgenic cow, Rosie, produced human protein-enriched milk (2.4 grams per litre). The milk contained