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