Get latest CBSE Class 12 Physics Sample Paper 2019-2020 with Marking Scheme. From the following table students may download CBSE Class 12 Physics Marking Scheme also. All of these previous year CBSE Class XII Physics Sample Paper are provided by Central Board of Secondary Education India.
CBSE Class XII Physics Sample Paper 2019-20
1. (a)How many electrons must be added to one plate and removed from the other so as to store 25.0 J of energy in a 5.0 nF parallel plate capacitor?
(b) How would you modify this capacitor so that it can store 50.0 J of energy without changing the charge on its plates?
2. Explain how does (i) photoelectric current and (ii) kinetic energy of the photoelectrons emitted in a photocell vary if the frequency of incident radiation is doubled, but keeping the intensity same? Show the graphical variation in the above two cases.
(i) Name the experiment which confirms the existence of wave nature of electrons. Derive the expression for de-Broglie wavelength of an electron moving under a potential difference of V volts. (ii) An electron and a proton have the same Kinetic Energy. Which of these particles has the shorter de-Broglie wavelength?
3. In a double slit experiment, the distance between the slits is 3 mm and the slits are 2 m away from the screen. Two interference patterns can be seen on the screen one due to light with wavelength 480 nm, and the other due to light with wavelength 600 nm. What is the separation on the screen between the fifth order bright fringes of the two interference patterns?
4. What do you understand by the statement ‘Light from the sun is unpolarised’. Explain how does sunlight gets polarized by the process of scattering?
5.With the help of a diagram, explain the principle of a device which changes a low voltage into a high voltage but does not violate the law of conservation of energy. Give any one reason why the device may not be 100% efficient.
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