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