CBSE Class 12 Physics Question Paper Foreign with answers 2017 (3)

CBSE Class 12 Physics Question Paper Foreign with answers 2017 (3). Students can download the last year 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. Also, download cbse 12 physics syllabus in PDF format.

1. Does the magnifying power of a microscope depend on the colour of the light used ? Justify your answer.

2. A photosensitive surface emits photoelectrons when red light falls on it. Will the surface emit photoelectrons when blue light is incident on it ? Give reason.

3. Draw logic symbol of an OR gate and write its truth table.

4. Write the expression for speed of electromagnetic waves in a medium of electrical permittivity ε and magnetic permeability μ.

5. Use the mirror equation to show that an object placed between f and 2f of a concave mirror forms an image beyond 2f.

OR

(a) State the condition under which a large magnification can be achieved in an astronomical telescope.

(b) Give two reasons to explain why a reflecting telescope is preferred over a refracting telescope.

6. Find the intensity at a point on a screen in Young’s double slit experiment where the interfering waves have a path difference of (i) λ/6, and (ii) λ/2.

7. Describe, with the help of a circuit diagram, the working of a photodiode.

8. Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.

9. A light bulb and a solenoid are connected in series across an ac source of voltage. Explain, how the glow of the light bulb will be affected when an iron rod is inserted in the solenoid.

10. A proton and an α-particle move perpendicular to a magnetic field. Find the ratio of radii of circular paths described by them when both have (i) equal velocities, and (ii) equal kinetic energy.

11. Draw the intensity distributions for (i) the fringes produced in interference, and (ii) the diffraction bands produced due to single slit. Write two points of difference between the phenomena of interference and diffraction.

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