Skip to content

TNPSC FORUM

TNPSC All in One
  • Forum
  • Privacy Policy
  • Terms and Conditions

TNPSC FORUM

TNPSC All in One
  • Forum
  • Privacy Policy
  • Terms and Conditions
Home » Optics Tenth std Science Lesson 2 for TNPSC Group 2 TNPSC Group 4

Optics Tenth std Science Lesson 2 for TNPSC Group 2 TNPSC Group 4

  • by Admin
  • January 21, 2022January 31, 2022
Spread the love


OPTICS

1. _____ is a form of energy which travels in the form of waves

Show Answer

Light

2. The path of light is called ____

Show Answer

Ray of light 

3. Group of  rays are called as_____

Show Answer

Beam of light

4. Any object which gives out light are termed as _____

Show Answer

Source of light

5. Some of the sources emit their own light and they are called as____

Show Answer

 Luminous objects

6. All the stars, including the Sun, are examples for _______

Show Answer

Luminous objects

7. Light always travels along a ______” line

Show Answer

Straight

8.The speed of light in vacuum or air is____

Show Answer

c = 3 × 108 ms–1.

9. Different coloured light has ______ wavelength and frequency

Show Answer

Different

10. ____light has the lowest wavelength

Show Answer

Violet

11._____light has the highest wavelength.

Show Answer

Red

12. When a ray of light travels from one transparent medium into another obliquely, 

the path of the light undergoes

Show Answer

Deviation

13._______takes place due to the difference in the velocity of light in different media

Show Answer

Refraction

14. The velocity of light is____ in a 

Show Answer

Rarer medium

15. The velocity of light is____ in a denser medium

Show Answer

Less

16. The incident ray, the refracted ray of light and the normal to the refracting surface all lie in the ____ plane.

Show Answer

Same

17. Second law of refraction is also known as ______

Show Answer

Snell’s law.

18. When light travels from a denser medium into a rarer medium, the refracted ray is _____away from the normal drawn to the interface.

Show Answer

Bent

19. If a source of light produces a light of single colour, it is known as _____

Show Answer

Monochromatic source

20. When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as

Show Answer

 Dispersion of light

21. The band of colours is termed as____ 

Show Answer

Spectrum

22. Angle of refraction is the smallest for ___

Show Answer

Red

23. Angle of refraction is the highest for 

Show Answer
Violet

24. The interacting particle of the medium is called as_____

Show Answer

Scatterer

25.  The refractive index of a medium is dependent on the _______of the light.

Show Answer

Wavelength

26. When sunlight enters the Earth’s atmosphere, the atoms and molecules of different gases present in the atmosphere refract the light in all possible directions. This is called as____

Show Answer

‘Scattering of light’. 

27. The interacting particle of the medium is called as_____

Show Answer

 Scatterer

28. If the energy of the incident beam of light and the scattered beam of light are same, then it is called as

Show Answer

 Elastic scattering

29. If the energy of the incident beam of light and the scattered beam of light are not same, then it is called as____

Show Answer

Inelastic scattering’.

30. The scattering of sunlight by the atoms or molecules of the gases in the earth’s atmosphere is known as _______

Show Answer

Rayleigh scattering.

31.____scattering takes place when the diameter of the scatterer is similar to or larger than the wavelength of the incident light.

Show Answer

Mie

32. _______ is caused by pollen, dust, smoke, water droplets, and other particles in 

the lower portion of the atmosphere.

Show Answer

Mie scattering

33.______ is responsible for the white appearance of the clouds.

Show Answer

Mie scattering

34. The scattering of light rays by the colloidal particles in the colloidal solution is 

called ______

Show Answer

Tyndall Scattering or Tyndall Effect.

35. _______Scattering is defined as “The interaction of light ray with the particles of pure liquids or transparent solids, which leads to a change in wavelength or frequency.”

Show Answer

Raman

36. The spectral lines having frequency equal to the incident ray frequency is called _____

Show Answer

‘Rayleigh line

37.  The spectral lines which are having frequencies other than the incident ray 

frequency are called

Show Answer

‘Raman lines’. 

38. A _______is an optically transparent medium bounded by two spherical refracting surfaces or one plane and one spherical surface

Show Answer

Lens

39. Convex lens is also called as 

Show Answer

Converging lens

40. Concave lens is also called as 

Show Answer

Diverging lens

41. If one of the faces of a bi-convex lens is plane, it is known as a_____

Show Answer

Planoconvex lens.

42.  If one of the faces of a bi-concave lens is plane, it is known as a ______

Show Answer

Plano-concave lens. 

43. When an object is placed in front of a lens, the ______from the object fall on the lens

Show Answer

Light rays

44. ________lenses are used as camera lenses

Show Answer

Convex lenses

45. ________are used as magnifying lenses

Show Answer

Convex

46. ________are used in making microscope, telescope and slide projectors

Show Answer

Convex lenses

47. Convex lensrs are used to correct the defect of vision called 

Show Answer

Hypermetropia

48. Concave lenses are used as eye lens of _______

Show Answer

Galilean Telescope’

49. ________are used in wide angle spy hole in doors.

Show Answer

Concave lenses

50. ____ are used to correct the defect of vision called ‘myopia

Show Answer

Concave lenses

51. All lenses are made up of ________materials

Show Answer

Transperant

52. When a ray of light falls on a lens, the ability to converge or diverge these light rays depends on the _____of the lens. 

Show Answer

Focal length

53. The ability of a lens to converge (convex lens) or diverge (concave lens) is called as its____

Show Answer

Power

54. The SI unit of power of a lens is ____

Show Answer

Dioptre

55. The power of a ____lens is taken as positive

Show Answer

Convex

56. The power of a____ lens is taken, as negative. 

Show Answer

Concave

57._____is a converging lens.

Show Answer

Convex lens

58. _____ is a diverging lens

Show Answer

Concave lens

59. The eye ball is approximately spherical in shape with a diameter of about ____

Show Answer

2.3 cm

60. _____protects the internal parts of the eye

Show More

Sclera

61.____ is the thin and transparent layer on the front surface of the eyeball

Show Answer

Cornea

62. ____ is the coloured part of the eye

Show Answer

Iris

63. ______controls amount of light entering into the 

pupil like camera aperture.

Show Answer

Iris

64.____is the centre part of the Iris. It is the pathway for the light to retina.

Show Answer

Pupil

65. ______is the back surface of the eye. It is the most sensitive part of human eye, on which real and inverted image of objects is formed. 

Show Answer

Retina

66. Eye lens is fixed between the______ 

Show Answer

Ciliary muscles

67. _____ is made of a flexible, jelly-like material

Show Answer

Eye lens

68. The minimum distance required to see the objects distinctly without strain is called ____distance of distinct vision

Show Answer
Least 

69. A normal human eye can clearly see all the objects placed between _____ and infinity

Show Answer
. 

25cm

70. _____ also known as short sightedness

Show Answer

Myopia

71. ______, also known as long sightedness, occurs due to the shortening of 

Show Answer

Eye ball.

Hypermeteropia 

72. Some persons may have both the defects of vision – myopia as well as hypermetropia. This can be corrected by 

Show Answer

Bifocal lenses 

73. In this defect, eye cannot see parallel and horizontal lines clearly

Show Answer

Astigmatism 

74. Simple microscope has a convex lens of short_____

Show Answer

 Focal length. 

75. _____ are used by watch repairers and jewellers.

Show Answer

Simple microscope 

76. _____is used to observe finger prints in the field of 

forensic science.

Show Answer

Simple microscope 

77. A ______ microscope consists of two 

convex lenses

Show Answer

Compound 

78. A _______ microscope is one of the best instrument for measuring very small length with high degree of accuracy at the order of 0.01mm. 

Show Answer

Travelling 

79. ______works based on the principle of vernier. Its least count is 0.01 mm

Show Answer
Travelling microscope 

80. _______is an optical instrument to see 

the distant objects

Show Answer

Telescope 

81.The first telescope was invented by _____ in 1608

Show Answer

Johann Lippershey 

82. ______ is used to view heavenly bodies like stars, planets galaxies and satellites.

Show Answer

Astronomical telescope 




By practising the above questions answers we can be confident in the lesson OPTICS objective questions. Because this article is made up by reading each and every line in the text book.  To prepare well for the TNPSC Group exams we need to study thesamacheer text books.  


Tags:All the objective questionsOptics line by lineOptics objective questionsOptics one woed QuestionsOptics sciencsOptics study materialTnpsc group 2 study materialTNPSC group 4 study material

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Archives

  • October 2022
  • June 2022
  • February 2022
  • January 2022

Categories

  • English Medium
  • Science
  • Uncategorized

Neve | Powered by WordPress

You cannot copy content of this page