A material in which electrons are tightly bound and cannot move freely at room temperature is called
  • conductors
  • superconductors
  • semiconductors
  • insulators
According to the principle of conservation of charge
  • charges can be created but it cannot be destroyed
  • charges cannot be created but can be destroyed
  • the sum of charges in any system is constant
  • the algebraic sum of charges in any closed system is constant
A coulomb is same as:
  • ampere/second
  • ampere.second
  • ampere/second2
  • ampere/meter2
When a glass rod is rubbed with silk, it becomes positively charged because
  • Protons are transferred to silk
  • Electrons are transferred to silk
  • Protons are added to it.
  • Electrons are added to it.
The charge on a glass rod that has been rubbed with silk is called positive:
  • so that the proton charge will be positive
  • because like charges repel
  • to conform to the conventions adopted for G and m in Newton’s law of gravitation
  • by arbitrary convention
A material in which electrons are loosely bound and can move freely at room temperature is called
  • insulator
  • superconductor
  • semiconductor
  • conductor
To make an uncharged object to have a negative charge we must:
  • add some electrons correct
  • add some atoms
  • remove some atoms
  • remove some electrons
When conductors are placed in an electric field, their electrons are moved
  • May be randomly or in direction of applied field.
  • In a direction of applied field
  • Randomly in all direction
  • Opposite to applied field
Quarks are entities that have
  • Fractional charges, combination of these are present in protons and neutrons
  • integer charges, combination of these are present in protons, electrons and neutrons
  • fractional charges, combination of these are present in protons and electrons
  • no charge, combination of these are present in protons and electrons
A negative ion is an atom that ________ electrons
  • is going to loose
  • is going to gain
  • has gained
  • has lost
When a hard rubber rod is given a negative charge by rubbing it with wool:
  • negative charges are transferred from wool to rod
  • positive charges are transferred from wool to rod
  • negative charges are transferred from rod to wool
  • positive charges are transferred from rod to wool
The value of charge on a body which carries 30 excess electrons is
Electric-Charge-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning.png
  • A
  • B
  • C
  • D
The total negative charge in 1 mol of helium (atomic number 2, atomic mass 4) is:
117.png
  • A
  • B
  • C
  • D
When we rub a glass rod with silk, then
  • mass of silk decreases
  • mass of glass rod and silk increases
  • mass of glass rod increases
  • mass of glass rod decreases
How many electrons are present in 1 coulomb of charge?
  • 1.6 × 10 -19
  • 6.25 × 10 19
  • 6.25 × 10 18
  • 6.25 × 10 -18
What does q1 + q2 = 0 signify?
  • q1 and q2 are equal charges
  • q1 and q2 are equal charges but have opposite sign
  • q1 and q2 are equal charges and have same sign
  • q1 and q2 are not equal charges but have same sign
A silk cloth rubbed with a glass rod acquire a charge (-1.6 - 10 -19) C. Then the charge on the glass rod is
  • - 3.2 × 10 -19 C
  • - 1.6 × 10 -19 C
  • +1.6 × 10 -19 C
  • 3.2 × 10 -19 C
To make uncharged object have a positive charge:
  • add some electrons
  • remove some electrons
  • add some neutrons
  • remove some neutrons
Two glass rods rubbed with silk are placed close to each other. They will
  • will attract
  • will repel or attract, cannot predict
  • neither repel nor attract
  • will repel
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