CBSE Class 12 Physics Electrostatic Potential and Capacitance MCQs Set C

Question. A metallic shell having inner radius R1 and outer radii R2 has a point charge Q kept inside cavity. Electric field in the region R1 < r < R2 where r is the distance from the centre is given by   
(a) depends on the value of r
(b) Zero
(c) Constant and nonzero everywhere
(d) None of the above

Answer: B

Question. The best definition of polarisation is   
(a) Orientation of dipoles in random direction
(b) Electric dipole moment per unit volume
(c) Orientation of dipole moments
(d) Change in polarity of every dipole

Answer: B

Question. The electric field inside the cavity is depend on   
(a) Size of the cavity
(b) Shape of the cavity
(c) Charge on the conductor
(d) None of the above

Answer: D

Question. If a negatively charged rod touches a conductor, the conductor will be charged by what method?
(a) Friction
(b) Conduction
(c) Induction
(d) Convection

Answer: B

Question. A negatively charged rod is touched to the top of an electroscope, which on is correct in the given figure 

(a) A
(b) B
(c) C
(d) D

Answer: C

Question. Calculate the polarisation vector of the material which has 100 dipoles per unit volume in a volume of 2 units.   
(a) 200
(b) 50
(c) 0.02
(d) 100

Answer: A

Question. Due to electrostatic induction in aluminum rod due to charged plastic rod, the total charge on the aluminum rod is   
(a) Zero
(b) Positive
(c) Negative
(d) Dual

Answer: A

Question. If we bring charged plastic rod near-neutral aluminum rod, then rods will 
(a) Repel each other
(b) Attract each other
(c) Remain their position
(d) Exchange charges

Answer: B

Question. Which of the following statement is correct? The electric field at a point is   
(a) always continuous.
(b) continuous if there is a charge at that point.
(c) discontinuous only if there is a negative charge at that point.
(d) discontinuous if there is a charge at that point.

Answer: B

Question. Electrostatic shielding is based       
(a) electric field inside the cavity of a conductor is less than zero
(b) electric field inside the cavity of a conductor is zero
(c ) electric field inside the cavity of a conductor is greater than zero
(d) electric field inside the cavity of a plastic is zero

Answer: B

Question. Dipoles are created when dielectric is placed in __________   
(a) Magnetic Field
(b) Electric field
(c) Vacuum
(d) Inert Environment

Answer: B

Question. Identify which type of polarisation depends on temperature. 
(a) Electronic
(b) Ionic
(c) Orientational
(d) Interfacial

Answer: C

Question. What do you call the process of charging a conductor by bringing it near another Charged object?           
(a) Induction
(b) Polarisation
(c) neutralization
(d) conduction

Answer: A

Question. When you charge a balloon by rubbing it on your hair this is an example of what method of charging?      
(a) Friction
(b) Conduction
(c) Grounding
(d) Induction

Answer: A

Question. The force per unit charge is known as     
(a) electric flux
(b) electric field
(c) electric potential
(d) electric current

Answer: B

Question. Neutral atoms contain equal numbers of positive __ and negative __. 
(a) Electrons and Protons
(b) Protons and Electrons
(c) Neutrons and Electrons
(d) Protons and Neutrons

Answer: B

Question. The SI unit of electric field is   
(a) N/m
(b) N-m
(c) N/C
(d) N/C2

Answer: B

Question. Transferring a charge without touching is ___   
(a) Conduction
(b) Induction
(c) Grounding
(d) Newtons 3rd law

Answer: B

Question. During the lightning thunderstorm, it is advised to stay   
(a) inside the car
(b) under trees
(c) in the open ground
(d) on the car

Answer: B

Question. Which of the following material can be used to make a Faraday cage (based on electrostatic shielding)     
(a) Plastic
(b) Glass
(c) Copper
(d) Wood

Answer: C

Question. The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by 
(a) mge
(b) mg/e
(c) e/mg
(d) e²g/m²

Answer: B

Question. Which particle in an atom can you physically manipulate?   
(a) protons
(b) electrons
(c) neutrons
(d) you can’t manipulate any particle in an atom

Answer: B

Question. The negatively charged balloon is brought near the two cans. What happens? 

(a) The negative charges in Can B move towards the balloon
(b) The negative charges in Can A move away from the balloon
(c) The positive charges in Can B move towards the balloon
(d) The positive charges in Can A move away from the balloon

Answer: B

Question. At a particular point, Electric field depends upon 
(a) Source charge Q only
(b) Test Charge q0 only.
(c) Both q and q0
(d) Neither Q nor q0

Answer: A

Question. The total polarisation of a material is the 
(a) Product of all types of polarisation
(b) Sum of all types of polarisation
(c) Orientation directions of the dipoles
(d) Total dipole moments in the material

Answer: B