The objective and the eye-piece of the compound microscope having a focal length of 0.95 cm and 5 cm, respectively, are kept at a distance of 20 cm. At a distance of 25 cm the large image is formed. Calculate the total magnification.

  1. Home
  2. Back

Question:
The objective and the eye-piece of the compound microscope having a focal length of 0.95 cm and 5 cm, respectively, are kept at a distance of 20 cm. At a distance of 25 cm the large image is formed. Calculate the total magnification.

1.84

2.80

3.94

4.75

Posted Date:-2021-12-08 12:14:22

More MCQS Questions and answers

  1. Conductors are materials that allow
  2. In a photoelectric experiment for 4000 Ã… incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Ã…, then the potential required to stop the ejection of electrons will be
  3. In a single-mode fibre, how does the fraction of energy travelling through bound mode appear in the cladding?
  4. Resolving power of a microscope depends upon
  5. Resolving power of light microscope is
  6. Two parallel conductors separated by a distance 2r carries current i in the same direction. The intensity of the magnetic field midway between them is
  7. What is the inverse of resistance called?
  8. What is the ratio of resolving power of an optical microscope for wavelengths λ1= 4000 Å and λ2= 6000 Å?
  9. Which among the following fibre optic cables have a core of size 480 μm to 980 μm and made up of polymethylmethacrylate?
  10. Which of the following is not due to total internal reflection of light?
  11. Which of the following is the most conductive element?
  12. A cyclotron can accelerate
  13. A material that has zero resistance is called
  14. A microscope is used to focus on an object at the bottom of a beaker. The microscope is raised by 1 cm. To what height should the water be poured to bring the object in focus again. Refractive index of water is 4/3.
  15. A proton of energy 100 eV is moving perpendicular to a magnetic field 10-4 T. The cyclotron frequency of the proton in radian/sec
  16. A ray of light will undergo total internal reflection if it
  17. A vertical microscope is focused on a point at the bottom of an empty tank. Then water (μ=4/3) is poured into the tank up to a height of 4 cm. After which a liquid that does not mix with water is poured over it up to a height of 2 cm above the water. The refractive index of the liquid is 3/2. What should be the vertical distance through which the microscope must be moved to bring the object in focus again?
  18. An alternating electric field of frequency f is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton, produced by it, are given by
  19. Consider a circular conductor with 2m radius and 8 A current flowing through it. What is the value of magnetic field intensity at the centre of the circular conductor?
  20. Consider a current i flowing through the inner conductor of a coaxial cable and the current returns along the outer conductor of the cable. The value of magnetic induction at a distance r from the axis is
  21. Cyclotron can be used in
  22. Cyclotron cannot accelerate
  23. Data signal with minimum error is generated by which among the following
  24. Differentiation capacity of a compound microscope is
  25. Good conductors have many loosely bound
  26. High-frequency long-distance propagation mostly depends on
  27. If the current I flows through the coil of radius r then the field at the centre of the circular coil is
  28. If the strength of the magnetic field at a point r near a long straight current-carrying wire is B. The value of the field at a distance r/2 will be
  29. If the work function for a certain metal is 3.2 x 10-19 joule and it is illuminated with light of frequency 8 x 1014 Hz. The maximum kinetic energy of the photo-electrons would be (h= 6.63 x 10-34 Js).
  30. In an optical fibre communication system, which among the following is not a typical transmitter function?
  31. In Kirchhoff’s first law Σi = 0 at the junction is based on the conservation of
  32. In single-mode fibres, the cladding diameter must be at least
  33. Kirchhoff’s Current Law is based on
  34. Light of wavelength 4000 Ã… is incident on a sodium surface for which the threshold wavelength of photo-electrons is 5420 Ã…. The work function of sodium is
  35. Mathematical prediction of radio waves was done by
  36. Photocell is a device to
  37. Photoelectric effect was explained by
  38. Photoelectrons stopping potential depends on
  39. Photoelectrons stopping potential depends on
  40. Radio waves sometimes bend around the corners due to
  41. Radio waves would strongly reflect off
  42. Suppose a cyclotron is operated at an oscillator frequency of 12 MHz and a dee radius of 53cm. What is the resulting kinetic energy of the deuterons?
  43. The algebraic sum of voltages around any closed path in a network is equal to
  44. The angular frequency of a cyclotron is independent of
  45. The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately
  46. The electric field and magnetic field of a radio wave are
  47. The energy gap is maximum in
  48. The energy of emergent protons in MeV from a cyclotron having a radius of its dees 2 m and applied magnetic field 0.8 T is (mass of proton = 1.67 x 10-27 kg).
  49. The fibres not used nowadays for optical fibre communication system are
  50. The fibres not used nowadays for optical fibre communication system are
  51. The magnetic field due to a copper rod carrying direct current is
  52. The magnification power of a compound microscope does not depend upon
  53. The maximum kinetic energy of the positive ion in the cyclotron is
  54. The minimum energy required to remove an electron is called
  55. The objective and the eye-piece of the compound microscope having a focal length of 0.95 cm and 5 cm, respectively, are kept at a distance of 20 cm. At a distance of 25 cm the large image is formed. Calculate the total magnification.
  56. The radio waves were demonstrated experimentally by
  57. The resistance of the conductor is directly proportional to
  58. The speed of radio wave in free space is
  59. The stopping potential value is 0.6 V when the light source is kept at a distance of 20 cm. When the source is kept at 40 cm away, the stopping potential will be
  60. The terminal potential difference will be greater than its emf when it is
  61. To which law of electricity is Biot Savart law of magnetism analogous to
  62. Two identical glass (μg=3/2) equi – convex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water ((μw=4/3). The focal length of the combination is
  63. Using a microscope a glass plate of 5 mm is viewed from the above. The microscope is lowered by 3 mm to view the bottom surface of the glass. What is the refractive index of the glass?
  64. What is the distance from the far end of the ground wave to the nearest point where the sky wave returns to earth called?
  65. What is the value of the maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm?
  66. When the cells are connected in parallel, then
  67. Which among the following is described by the concept of numerical aperture in an optical fibre?
  68. Which among the following is not an insulator?
  69. Which basic law should be followed to analyse the circuit?
  70. Which is the equation of the magnetic field according to Biot-Savart’s law?
  71. Which of the following are electromagnetic
  72. Which of the following is the phenomenon caused when Radio waves travel in two or more paths during propagation and produce slowly-changing phase differences between signals?
  73. Which of the following properties cannot be calculated from Biot Savart law?
  74. Why is copper a preferred choice in making electrical wires?
  75. With the increase in temperature the resistance of semiconductors
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!