Samacheer Kalvi EM 12 Physics Vol2 Unit6 MCQs Mock Test

12th Physics - Volume 2 Mock Test

Unit 6: Optics

Choose the correct answer from the multiple choices, then click "Next" to goto next question and click "OK" after seeing the score.

 

1. The speed of light in an isotropic medium depends on,
   1.   its intensity
   2.   its wavelength
   3.   the nature of propagation
   4.   the motion of the source w.r.to medium
2. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is, (AIPMT Main 2012)
   1.   2.5 cm
   2.   5 cm
   3.   10 cm
   4.   15 cm
3. An object is placed in front of a convex mirror of focal length of ƒ and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified. (IEE Main 2009)]
   1.   2ƒ and c
   2.   c and ∞
   3.   ƒ and O
   4.   None of these
4. For light incident from air on a slab of refractive index 2. Maximum possible angle of refraction is,
   1.   30°
   2.   45°
   3.   60°
   4.   90°
5. If the velocity and wavelength of light in air is V_a and λ_a and that in water is V_w and λ_w, then the refractive index of water is,
   1.   `\frac{V_w}{V_a}`
   2.   `\frac{V_a}{V_w}`
   3.   `\frac{\lambda_w}{\lambda_a}`
   4.   `\frac{V_a\lambda_a}{V_w\lambda_w}`
6. Stars twinkle due to
   1.   reflection
   2.   total internal reflection
   3.   refraction
   4.   polarisation
7. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index,
   1.   less than one
   2.   less than that of glass
   3.   greater than that of glass
   4.   equal to that of glass
8. The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,
   1.   5 cm
   2.   10 cm
   3.   15 cm
   4.   20 cm
9. An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is,
   1.   8 cm
   2.   10 cm
   3.   12 cm
   4.   16 cm
10. A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45°. The ray can undergo total internal reflection for the following n,
    1.   n=1.25
    2.   n=1.33
    3.   n=1.4
    4.   n=1.5
11. A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,
    1.   red
    2.   yellow
    3.   green
    4.   violet
12. Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, λ=500 nm]
    1.   1 m
    2.   5 m
    3.   3 m
    4.   6 m
13. In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to,
    1.   2D
    2.   D/2
    3.   √2D
    4.   D/√2
14. Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988]
    1.   5I and I
    2.   5I and 3I
    3.   9I and I
    4.   9I and 3I
15. When light is incident on a soap film of thickness `5\times10^{-5}` cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be,
    1.   1.22
    2.   1.33
    3.   1.51
    4.   1.83
16. First diffraction minimum due to a single slit of width `1.0\times10^{-5}` cm is at 30°. Then wavelength of light used is,
    1.   400 Å
    2.   500 Å
    3.   600 Å
    4.   700 Å
17. A ray of light strikes a glass plate at an angle 60°. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is,
    1.   √3
    2.   3/2
    3.   `\sqrt{\frac3{2}}`
    4.   2
18. One of the of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,
    
    
    1.   get shifted downwards
    2.   get shifted upwards
    3.   will remain the same
    4.   data insufficient to conclude
19. Light transmitted by Nicol prism is,
    1.   partially polarised
    2.   unpolarised
    3.   plane polarised
    4.   elliptically polarised
20. The transverse nature of light is shown in,
    1.   interference
    2.   diffraction
    3.   scattering
    4.   polarisation

Samacheer Kalvi EM 12th Std Physics Vol2 Unit6 MCQs Mock Test Instructions

Unit 6: Optics

Here you will find 20 MCQs questions and options. Read the questions carefully and select the appropriate answer for the question by selecting/clicking the box before the option. A pop-up box will open by displaying the result of the option selected. The result of each question will be based on percentages. Each question will have 3 chances to select the right option and for every chance, the percentage of scores will be reduced. Likewise, the remaining questions also take place. The overall percentage scored will be displayed at the completion of the mock test.

Note: Every time the page loads, the question and options will be randomized and takes you to the beginning of the particular exercise.

Button Navigations:

The Below Image shows the button navigations.

• The Home Button On the Top and Bottom Navigates to the Homepage of the Subject (Example: To Physics Vol2 if the mock test is taken from Physics Vol2).
• The Next Unit Button on the Top and Bottom Navigates to the Next Unit (Example: From Unit 6 to Unit 7 and so on).
• The Goto Subjects Button on the Top and Bottom Navigates to the 12th Std subject list (Example: From MCQs to 12th Std subject list and so on).
• The Goto Phy Vol1 Button on the Top and Bottom Navigates to the Physics Vol2 Unit List (Example: From MCQs to Physics Vol2 Unit list and so on).
• The Next Button next to the question numbers Navigates to the Next Question (Example: From 1 to 2 and so on).
• The Show All Questions Button Displays all the questions and options of that exercise on a single page.
• The Option Box Icon (Box with Question mark icon), is the box that is to be selected for the correct option. By selecting/clicking the option box, a pop-up box will open by displaying the result of the option selected.