Multiple Choice Questions on Basic Science - Physics Set-2
MCQ on Electricity, Magnetism & semiconductors
1. The equation for electric flux density is given by
- D = εV
- D = εE
- D = ε/E
- D = ε/V
Answer : B
2. Electric field intensity is
- Directly proportional to the force applied
- Inversely proportional to the force applied
- Directly proportional to the permittivity
- Inversely proportional to the charge
Answer : A
3. The imaginary lines representing the electric field
- Electric field
- Electric flux
- Electric flux density
- Electric lines of force
Answer : D
4. What do you call the total number of electric lines of force in an electric field?
- Electric field
- Electric flux
- Electric flux density
- Electric lines of force
Answer : B
5. Electric lines of force about a negative point charge are
- circular, anticlockwise
- circular, clockwise
- radial, inward
- radial, outward
Answer : C
6. The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is
Answer : A
7. Electric flux density is a/an ________ quantity.
- scalar
- vector
- absolute
- relative
Answer : B
8. Electric potential is a
- scalar quantity
- vector quantity
- dimensionless quantity
- none of the above
Answer : A
9. Electric flux is a/an ________ quantity.
- scalar
- vector
- absolute
- relative
Answer : A
10. The measure of density of the electric charge
- Electric gradient
- Electric current
- Electric charge
- Electric potential
Answer : D
11. The basic law for interaction of charged bodies at rest.
- Charged law
- Gauss’s law
- Faraday’s law
- Coulomb’s law
Answer : D
12. According to the coulomb’s law, the force between two point charges is
- Directly proportional to the product of the charges
- Inversely proportional to the square of the distance between them
- Along the line joining them
- All of these
Answer : D
13. A magnetic field is
- The current flow through space around a permanent magnet
- The force set up when current flows through a conductor
- The force that drives current through a resistor
- The force between the plates of a charged capacitor
Answer : B
14. A semiconductor is formed by ........ bonds
- Covalent
- Electrovalent
- Co-ordinate
- None of the above
Answer : A
15. When a pure semiconductor is heated, its resistance ........
- Goes up
- Goes down
- Remains the same
- Can’t say
Answer : B
16. A hole in a semiconductor is defined as ..........
- A free electron
- The incomplete part of an electron pair bond
- A free proton
- A free neutron
Answer : B
17. A semiconductor has generally .......... valence electrons.
Answer : D
18. The most commonly used semiconductor is
- Germanium
- Silicon
- Carbon
- Sulphur
Answer : B
19. In a semiconductor, current conduction is due to
- Only holes
- Only free electrons
- Holes and free electrons
- None of the above
Answer : C
20. What determines the atomic number of an element?
- The number of protons
- The number of electrons
- The number of neutrons
- The number of neutrons and protons
Answer : A