Physics Important Questions Class 12 State Board. We covered all the Physics Important Questions Class 12 State Board in this post for free so that you can practice well for the exam.
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Physics Important Questions Class 12 State Board MCQs for Students
A work of 10 J is performed in a carrying charge of -10 C from infinity to a particular point in an electrostatic field. The potential of this point is :
(A) 100 V
(B) -10 V
(C) -1 V
(D) 1 V
Option c – -1 V
A particle A has charge +Q and particle B has charge +16Q with each of them having the same mass m when allowed to fall from rest through the same electrical potential difference, the ratio of their speeds VA/VB will be :
(A) 16 : 1
(B) 1:16
(C) 1 : 4
(D) 4 : 1
Option c – 1 : 4
A point charge of 60uC is situated in the air. The potential difference between two points situated at distances of 20 cm and 40 cm will be :
(A) 2 KV
(B) 1.35 KV
(C) 270 KV
(D) 1.35 MV
Option d – 1.35 MV
Two charges of 20uC and -10μC are placed in the air at a distance of 40 cm from each other. The potential at the center of the line joining the two charges :
(A) 10 MV
(B) 20 MV
(C) 450 KV
(D) 450 MV
Option c – 450 KV
If 100 J of work must be done to move an electric charge equal to 5 C from a place, where the potential is -10 V to another place where the potential is V, then the value of V will be :
(A) 15 V
(B) 10 V
(C) 10 V
(D) 25 V
Option b – 10 V
In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential, and points outside S have a negative potential. A positive charge, which is free to move, is placed inside S :
(A) it may move, but will ultimately return to its starting point
(B) it will remain in equilibrium
(C) it can move inside S, but it cannot cross S
(D) it must cross S at some time.
Option d – it must cross S at some time
A charge of 5 C is given a displacement of 0.5 m. The work done in the process is 20 J. The potential difference between the two points will be :
(A) 5 V
(B) 2 V
(C) 4 V
(D) 1 V
Option c – 4 V
A metal sphere of radius 5 cm is charged to 100 V. Electric intensity at a point on its surface is :
(A) 1000 V/m
(B) 5000 V/m
(C) 2500 V/m
(D) 2000 V/m
Option d – 2000 V/m
In the electric field surrounding a point charge, the intensity at a point is 30 V/m in a medium of dielectric constant 4. If the potential at that point is 120 V then the magnitude of charge will be :
(A) 213 PC
(B) 213 nC
(C) 213 µC
(D) 214 mC
Option b – 213 nC
We covered all the physics important questions class 12 state board above in this post for free so that you can practice well for the exam.
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