Class 12 Electric Charges And Fields CBSE Questions & Answers

This is Physics Class 12 Electric Charges and Fields CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.


Q.1) which of the following methods can be used to charge a metal sphere positively without touching it . Select the best 
  1. Rub it with a piece of fur 
  2. Connect the positive terminal a battery and float the other end of the battery
  3. Rub it with a piece of silk 
  4. Bring a negatively charged rod near the sphere and touch it to ground for a short while
Correct Answer: Bring a negatively charged rod near the sphere and touch it to ground for a short while
Q.2) If {tex}{\rm{1}}{0^{\rm{9}}}{/tex} electrons move out of a body to another body every second, how much time is approximately required to get a total charge of 1 C on the other body?
  1. 200 years 
  2. 220 years
  3. 120 years 
  4. 180 years
Correct Answer: 200 years 
Q.3) Electric charge 
  1. is a property of protons only
  2. is a property of particles such as atoms,ions,electrons etc that defines their behaviour in electrical fields.
  3. is a property of neutrons onlz
  4. is a property of electrons only
Correct Answer: is a property of particles such as atoms,ions,electrons etc that defines their behaviour in electrical fields.
Q.4) Electric charges are of 
  1. 3 types
  2. 2 types
  3. 5 types
  4. 4 types
Correct Answer: 2 types
Q.5) Conservation of charges in tribo electric charging 
  1. implies half are positively charged and other half are neutral
  2. implies both are positively charged
  3. implies one is positively charged and the other is negatively charged.
  4. implies both are negatively charged 
Correct Answer: implies one is positively charged and the other is negatively charged.
Q.6) Two positive charges 
  1. repel each other
  2. attract each other
  3. attract each other at times and repel at other times
  4. always attract each other
Correct Answer: repel each other
Q.7) Charge is quantized means 
  1. charges can take on any discontinuous value
  2. charges can take on discrete values that are multiples of charge on neutron
  3. charges can take on any continuous value
  4. charges can take on discrete values that are multiples of charge on electron 
Correct Answer: charges can take on discrete values that are multiples of charge on electron 
Q.8) Ionization of a neutral atom is the 
  1. only gain of one or more neutrons
  2. gain or loss of one or more electrons
  3. only gain of one or more protons
  4. only gain of one or more electrons
Correct Answer: gain or loss of one or more electrons
Q.9) electrostatic force is 
  1. force exerted by one charge on another when the two are moving in a given frame of reference
  2. force exerted by one charge on another when the two are accelerating in a given frame of reference
  3. force exerted by an electron on a neutron 
  4. force exerted by one charge on another when the two are at rest in a given frame of reference
Correct Answer: force exerted by one charge on another when the two are at rest in a given frame of reference
Q.10) Conductors are materials 
  1. that allow movement of neutrons
  2. that allow movement of protons
  3. that allow movement of electrons 
  4. that allow only random movement of electrons
Correct Answer: that allow movement of electrons 
Q.11) In charging by Induction 
  1. a metallic object by touching touching with a charged object 
  2. a metallic object is charged by rubbing it with silk 
  3. a metallic object is charged by rubbing it with fur
  4. a metallic object is charged by bringing a charged object near it
Correct Answer: a metallic object is charged by bringing a charged object near it
Q.12) For charges {tex}{{\rm{q}}_{\rm{1}}}{\rm{and }}{{\rm{q}}_{\rm{2}}}{/tex}  separated by a distance R the magnitude of the electrostatic force is given by 
  1. {tex}F =\frac{q_1 q_2}{4\pi \epsilon_0 R^3}{/tex}
  2. {tex}F =\frac{q_1 }{4\pi \epsilon_0 R^2}{/tex}
  3. {tex}F =\frac{q_1 q_2}{4\pi \epsilon_0 R^2}{/tex}.
  4. B .  {tex}F =\frac{q_1 q_2}{4\pi \epsilon_0 R}{/tex}
Correct Answer: {tex}F =\frac{q_1 q_2}{4\pi \epsilon_0 R^2}{/tex}.
Q.13) The unit of charge is 
  1. ampere 
  2. ohm
  3. coulomb 
  4. volt
Correct Answer: coulomb 
Q.14) Electric field at a point is defined as 
  1. electric force experienced by two charges at that point
  2. electric force per unit charge experienced by a unit charge at that point 
  3. electric force experienced by a dipole at that point
  4. electric force experienced by a charge at that point
Correct Answer: electric force per unit charge experienced by a unit charge at that point 
Q.15) According to superposition of electric fields 
  1. The electric field of any combination of charges is the vector sum of the individual charges. 
  2. The electric field of any combination of charges is the vector sum of the fields caused by the individual charges. 
  3. The electric field of any combination of charges is the scalar sum of the fields caused by the individual charges.
  4. The electric field of any combination of charges is the cross product of the individual fields.
Correct Answer: The electric field of any combination of charges is the vector sum of the fields caused by the individual charges. 

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