12th Class Physics Electric Charges and Fields Question Bank

done Assertion and Reason (MCQs) - Electric Charges and Fields Total Questions - 26

• question_answer1)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): When we rub a glass rod with silk, the rod gets positively charged and the silk gets negatively charged.

  Reason (R): On rubbing, electrons from silk cloth move to the glass rod.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer2)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Charge is quantize(d)

  Reason (R): Charge, which is less than 1 C is not possible.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false  done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer3)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Charging is due to transfer of electrons.

  Reason (R): Mass of a body decreases slightly when it is negatively charged.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer4)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): When bodies are charged through friction, there is a transfer of electric charge from one body to another, but no creation or destruction of charge.

  Reason (R): This follows from conservation of electric charges.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer5)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The charge on a body can be increased or decreased in terms of electronic charge e.

  Reason (R): Quantisation of charge means that the charge on a body is the integral multiple of electronic charge e.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer6)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The coulomb force is the dominating force in the universe.

  Reason (R): The coulomb force is weaker than the gravitational force.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer7)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Coulomb force and gravitational force follow the same inverse-square law.

  Reason (R): Both laws are same in all aspects.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer8)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): If there exists coulomb attraction between two bodies, both of them may not be charged.

  Reason (R): In coulomb attraction two bodies are oppositely charged.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer9)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Electric force acting on a proton and an electron, moving in a uniform electric field is same, where as acceleration of electron is 1836 times that of a proton.

  Reason (R): Electron is lighter than proton.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer10)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): For charge to be in equilibrium, sum of the forces on charge due to rest of the two charges must be zero.

  Reason (R): A charge is lying at the centre of line joining two similar charges each which are fixed. The system will be in equilibrium, if that charge is one fourth of the similar charges.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer11)
            

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The force with which two charges attract or repel each other are not affected by the presence of a third charge.

  Reason (R): Force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to other charges, taken one at a time.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false   done clear
  D)
            Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer12)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Electric field at a point superimpose to give one resultant electric field.

  Reason (R): Electric lines of force cross each other.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer13)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Electric field is always normal to equipotential surfaces and along the direction of decreasing order of potential.

  Reason (R): Negative gradient of electric potential is electric field.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer14)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): If a proton and an electron are placed in the same uniform electric field. They experience different acceleration.

  Reason (R): Electric force on a test charge is independent of its mass.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer15)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): As force is a vector quantity, hence electric field intensity is also a vector quantity.

  Reason (R): The unit of electric field intensity is newton per coulomb.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer16)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): In a uniform electric field electron move in the opposite direction of electric field.

  Reason (R): This is because of the negative charge of an electron.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer17)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Three equal charges are situated on a circle of radius r such that they form an equilateral triangle, then the electric field intensity at the centre is zero.

  Reason (R): The force on unit positive charge at the centre, due to the three equal charges are represented by the three sides of a triangle taken in the same order.

  Therefore, electric field intensity at centre is zero.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer18)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): No two electric lines of force can intersect each other.

  Reason (R): Tangent at any point of electric line of force gives the direction of electric field.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer19)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Electrostatic field Lines start at positive charges and end at negative charges.

  Reason (R): Field lines are continuous curves without any breaks and they form closed loop.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false   done clear
  D)
            Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer20)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The electric lines of forces diverges from a positive charge and converge at a negative charge.

  Reason (R): A charged particle free to move in an electric field always move along an electric Line of force.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer21)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): In electrostatics, electric lines of force can never be closed loops, as a line can never start and end on the same charge.

  Reason (R): The number of electric lines of force originating or terminating on a charge is proportional to the magnitude of charge.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer22)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The surface charge densities of two spherical conductors of different radii are equal. Then the electric field intensities near their surface are also equal.

  Reason (R): Surface charge density is equal to charge per unit area.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer23)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Surface charge density of an irregularly shaped conductor is non-uniform.

  Reason (R): Surface density is defined as charge per unit area.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer24)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): Total flux through a closed surface is zero, if net charge enclosed by the surface is zero.

  Reason (R): Gauss law is true for any closed surface, no matter what its shape or size is.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer25)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): The electric flux emanating out and entering a closed surface are \[8\times {{10}^{3}}\]and \[2\times {{10}^{3}}\,Vm\]respectively.

  The charge enclosed by the surface is 0.053 u(C)

  Reason (R): Gauss's theorem in electrostatics may be applied to verify.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false             done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer26)

  Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason:

  (R). Mark the correct choice as:

  Assertion (A): A point charge is lying at the centre of a cube of each side. The electric flux emanating from each surface of the cube is \[\frac{1}{6}\]th of total flux.

  Reason (R): According to Gauss theorem, total electric flux through a closed surface enclosing a charge is equal to \[{}^{1}/{}_{{{\varepsilon }_{0}}}\]times the magnitude of the charge enclosed.

  A)
  Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A) done clear
  B)
  Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A) done clear
  C)
  Assertion (A) is true but Reason (R) is false            done clear
  D)
  Assertion (A) is false and Reason (R) is also false done clear
  View Solution play_arrow