CBSE Class 12 Physics Question Paper Solved 2019 Set B

CBSE Class 12 Physics Question Paper Solved 2019 Set B. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION – A

1. Define the term “threshold frequency”, in the context of photoelectric emission.

OR

Define the term “Intensity” in photon picture of electromagnetic radiation.

2. When unpolarised light is incident on the interface separating the rarer medium and the denser medium, Brewster angle is found to be 60°. Determine the refractive index of the denser medium.

3. In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz ?

OR

On what factors does the range of coverage in ground wave propagation depend ?

4. When a potential difference is applied across the ends of a conductor, how is the drift velocity of the electrons related to the relaxation time ?

5. Draw the equipotential surfaces due to an isolated point charge.

SECTION – B

6. Explain with the help of Einstein’s photo electric equation any two observed features

in photoelectric effect which cannot be explained by wave theory.

7. A deuteron and an alpha particle having same momentum are in turn allowed to pass through a magnetic field →B , acting normal to the direction of motion of the particles.

Calculate the ratio of the radii of the circular paths described by them.

8. Two bulbs are rated (P₁, V) and (P₂, V). If they are connected (i) in series and (ii) in parallel across a supply V, find the power dissipated in the two combinations in terms of P₁ and P₂. 

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