Question

give important question of 12th physics for bord exam expected ?

Answer 1

Answer:

Question: ________ is the current which can flow even in the absence of electric charge.  

Answer: Displacement current.

Explanation:

uestion: The SI unit of the electric polarization vector P is  _____

Answer: C/m2.

Question: The electromagnetic wave that is widely used as a diagnostic tool in medicine is __________

Answer: X - rays.

Question: Two particles have equal momenta then the ratio of their de-Broglie wavelengths is ___________

Answer: 1:1

Question: A charge q is placed at the point of intersection of body diagonals of a cube. The

electric flux passing through any one of its faces is  

(a) q/(6εo)

(b) 3q/εo

(c) 6q/εo

(d) q/3εo

Answer: (a)

Question: The electric potential of earth is taken to be zero because earth is a good

(a) Insulator  

(b) conductor  

(c) semiconductor  

(d) dielectric  

Answer: (b)

Question: If the ammeter in the given circuit shown in the diagram reads 2A, the resistance R is

1Ω  

2Ω  

3Ω  

4Ω

Answer: (a)

Question: The heat produced by 100W heater in 2 minutes is equal to

10.5kJ  

16.3kJ  

12.0kJ  

14.2kJ  

Answer:(c)

Question: Time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of

speed of the particle  

mass of the particle

charge of the particle  

magnetic field

Answer: (a)