CBSE Guess Paper

Physics

Class XII

Q1. What is quantization of charge. What is its cause? Can a body have a charge of 18*10^-20 C?

Q2. How are n-P-n and P-n-P transistors represented symbolically in a circuit?

Q3. Write any one equation representing nuclear fusion reaction?

Q4. In a hydrogen atom, an electron revolves around a proton. Which of these two exerts a greater electrostatic force on the other?

Q5. Define gyromagnetic ratio. What is it’s value?

Q6. What is the order of voltages that can be built up using a Van De Graff generator?

Q7. Describe how a metallic rod can be made positively charged by the method of induction.

Q8. The instantaneous current flowing from an a.c. source is I=5 sin 314t. What is the rms. value of current?

Q9. A velocity selector is to be designed for particles of velocity 10m/s. What magnetic field should be employed if the electric field in it is 100 N/C.

Q10. The resistivity of a metal X is 3.2 x 10^-8 while the free electron density is 5 x 10²⁸ m^-3. Find the drift velocity of electrons if a potential gradient of 1 Vm^-1 is applied across X.

---------------------Plese Go To Next Page----------------