11th Physics 2 Marks. We covered all the 11th Physics 2 Marks in this post for free so that you can practice well for the exam.
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11th Physics 2 Marks QnA for Students
When a ray of light enters from one medium to another, then its velocity in the second medium becomes doubled. The maximum value of the angle of incidence so that total internal reflection may not take place is
(A) 20⁰
(B) 30°
(C) 45°
(D) 60°
Option b – 30°
The wavelength of green colour in air and violet colour in water are 5000 A and 3000 Aº respectively. If the wavelength of green colour in water is the same as the wavelength of violet colour in the air, what is its value?
(A) 4045 Aº
(B) 2750 Aº
(C) 3000 Aº
(D) 3873 Aº
Option d – 3873 Aº
A parallel beam of light is incident on a water surface by making an angle of 60° with the surface. If the refractive index of water is 4/3. The ratio of the width of the refracted beam to the incident beam will be :
(A) 2.071
(B) 3.071
(C) 1.071
(D) 1.5
Option c – 1.071
A beam of light covers a distance of 900 m in the air in 3 μs. The time required by this light to cover a distance of 1800 m in the water with a refractive index of 4/3 will be :
(A) 4 μs
(B) 6 μs
(C) 5 µs
(D) 8 µs
Option d – 8 µs
We covered all the 11th physics 2 marks above in this post for free so that you can practice well for the exam.
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