Chapter 2

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Chapter 3

First Semester Basic Physics Question Bank

Chapter 2 Electricity, Magnetism & Semiconductor

ONE MARKS QUESTIONS (1 MARKS)

1. SI unit of specific resistance is ________*

1 Mark

Siemen-m

Siemen

Ω

Ωm

2. Electric lines of force is starts from _______ charge ends with ________ charge*

1 Mark

negative, positive

north, south

positive, negative

south, north

3. Current is rate of flow of _________ with respect to time.*

1 Mark

coulomb

charge/electron

water

voltage

4. The substance which conducts electricity are called _______.*

1 Mark

Semiconductors

Bad conductors

Conductors

Insulators

5. The band of energy occupied by the valence electrons is called ______.*

1 Mark

all of these

valence band

conduction band

forbidden band

6. The band of energy occupied by the free electrons or conduction electrons is called _______.*

1 Mark

valence band

conduction band

energy gap

none of these

7. The valence band and conduction band overlap each other in _______.*

1 Mark

conductors

semiconductors

all of these

insulators

8. The energy gap in ‘Ge' is _______.*

1 Mark

0.5 eV

1.9 eV

1.1 eV

0.7 eV

9. In conductors, as temperature increase, the conductivity_______.*

1 Mark

infinity

zero

decreases

increase

10. A pure semiconductors are called _______. *

1 Mark

extrinsic

trivalent

pentavalent

intrinsic

11. _______ impurities are formed p-typesemiconductors.*

1 Mark

trivalent

pentavalent

all of these

N-type

12. The process of adding an impurities into pure semiconductor acts as ________.*

1 Mark

conduction

resistance

doping

impurities

13. Which of the following is trivalent impurity?*

1 Mark

Indium

Antimony

phosphorus

Arsenic

14. Find trivalent impurity of the following.*

1 Mark

gallium and Aluminum

all of these

Indium

Boron

15. The pentavalent impurities are ______.*

1 Mark

phosphorus

arsenic

all of these

arsenic

16. ________ impurities forms N-type semiconductor.*

1 Mark

pure

donor

both donor and acceptor

acceptor

17. Acceptor impurities forms ______ semiconductor.*

1 Mark

both P-type and N-type

N-type

none of these

P-type

18. The electricity devloped on a body when it is rubbed with another body is called as _______.*

1 Mark

frictional electricity

none of these

magnetic electricty

current electricity

19. The principle of conservation of charges states that total charge on isolated system remains ________.*

1 Mark

small

large

variable

constant

20. The unit of specific resistance is _______*

1 Mark

ohm-ampere

ohm/ampere

ohm-meter

ohm /meter

21. ohm’s law is valid when temperature of conductor is _______*

1 Mark

none of these

changing

constant

not constant

22. siemen per meter is the unit of ________*

1 Mark

conductance

resistivity

specific resistance

conductivity

23. ohm's equation is ________*

1 Mark

I=VR

I=V/R

R=V/I

R=VI

24. magnetic intensity (H) is a _________.*

1 Mark

none of these

scalar quantity

fundamental quantity

vector quantity

25. Magnetic flux density (B)is...proportional to magnetic field intensity(H)*

1 Mark

directly

inversly

not

none of these

26. The bending of a beam of light when it passes obliquely from one medium to another is known as _______.*

1 Mark

Deviation

Reflection

Dispersion

Refraction

27. When a pure semiconductor is heated, its resistance ___________.*

1 Mark

Goes down

Remains the same

Can’t say

Goes up

28. When a pentavalent impurity is added to a pure semiconductor, it becomes ________.*

1 Mark

An intrinsic semiconductor

. p -type semiconductor

n-type semiconductor

An insulator

29. A trivalent impurity has ________ valence electrons.*

1 Mark

30. Addition of trivalent impurity to a semiconductor creates many _________.*

1 Mark

Free electrons

Bound electrons

Valence electrons

Holes

31. The battery connections required to forward bias a pn junction are ____________.*

1 Mark

+ ve terminal to p and –ve terminal to n

- ve terminal to p and –ve terminal to n

none of these

- ve terminal to p and +ve terminal to n

32. A reverse bias pn junction has ___________.*

1 Mark

Almost no current

Very narrow depletion layer

Very low resistance

Large current flow

33. At room temperature, an intrinsic silicon crystal acts approximately as __________.*

1 Mark

A battery

A conductor

A piece of copper wire

An insulator

34. The excess or deficiency of an electron in the body gives the concept of _______.*

1 Mark

joule

neutrons

coulomb

charge

35. Tthe types of electric charge are _______.*

1 Mark

positive charge

small charge

negative charge

both positive and negative charge

36.If the distance between two charges increases, the force between them ________.*

1 Mark

Decrease

Zero

Increase

Same

37. The ratio of permittivity of medium to permittivity of vacuum is called ________.*

1 Mark

both Electric constant and Dielectric constant (k)

Electric constant

Permittivity constant

Dielectric constant (k)

38. The dielectric constant of air is _______.*

1 Mark

Three

One

Two

Zero

39. The unit of charge is _______.*

1 Mark

Ampere

Newton

Joule

Coulomb

40. As the dielectric constant (K) of the medium increases, the electric field intensity ________.*

1 Mark

Increases

Decreases

Same

Zero

41. The SI unit of electric potential is _________.*

1 Mark

Volt

J/C

Both Volt and J/C

Ohm-A

42. The SI unit of magnetic Induction(B) is ________.*

1 Mark

Volt

Ampere

Tesla

Newton

43. The CGS unit of magnetic Induction(B) is _______.*

1 Mark

Tesla

Volt

Weber

Gauss

44. Magnetic lines of force _______ Intersect each other*

1 Mark

Never

Depends on medium

Some times

Always

45. Magnetic lines of force contract ________.*

1 Mark

Laterally

Both Longitudinally and Laterally

Areally

Longitudinally

46. The lines of force uniform field are ________.*

1 Mark

Parallel

Elliptical

Circular

Curved

47. The lines of force are crowded in region where the magnetic field is _________.*

1 Mark

Both Small and Large

Small

Zero

Large

48 .The SI unit of electric potential difference is ________.*

1 Mark

Ampere

Joule

Newton

Volt

49. The principle of conservation of charges states that, total charge on isolated system remains _________.*

1 Mark

constant

variable

small

large

51. Dielectric constant or relative permittivity of medium w.r.t. vacuum is the _________.*

1 Mark

Ratio of permittivity of vacuum to permittivity of medium

Product of permittivity of vacuum to permittivity of medium

None of these

Ratio of permittivity of vacuum to permittivity of medium

54. Electric potential is _______.*

1 Mark

Force per unit charge

Charge per unit force

Work done per unit charge

Charge per unit work

55. Electric current is defined as the ________.*

1 Mark

Electric charge per unit time

Product of electric charge and time

Force per unit positive charge

Time per unit electric charge

56. Low resistance means _________ and high resistance means _________*

1 Mark

Insulator, good conductor

Bad conductor, good conductor

Good conductor, bad conductor

Insulator, bad conductor

57. The resistance of a conductor at constant temperature depends on ________.*

1 Mark

Length

Cross-sectional

Material of conductor

all of these

58. Conductance is reciprocal of _________ and conductivity is reciprocal of _________ This statement is ________*

1 Mark

Resistance, resistivity

Current, potential

Resistivity, resistance

none of these

59. Ohm equation is _________.*

1 Mark

R=VI

I=R/V

I=VR

R=V/I

60. When number of resistances of connected in series then effective resistance ________.*

1 Mark

Increase

Remains same

none of these

Decreases

61. When Number of resistance are connected in parallel then effective resistance ________.*

1 Mark

Increases

Remains same

none of these

Decreases

62. As per Joules law, valid equation is _______.*

1 Mark

H=I2Rt/J

H=I2Jt/R

H=I2RJ/t

H=IR2t/J

63. Magnetic intensity(H) is a ________.*

1 Mark

Scalar quantity

Vector quantity

none of these

Fundamental quantity

64. Which of these following is not property of magnetic lines of force?*

1 Mark

They start from North Pole and end in South Pole outside the magnet

Magnetic lines of force from a closed loop

Magnetic lines of forces are affected by non-magnetic material

They never intersect each other

65. Magnetic flux density (B) is ________ proportional to magnetic field intensity (H).*

1 Mark

Inversely

Not

Directly

none of these

66. If distance of a point from a charge is halved then the potential at the point becomes __________*

1 Mark

Double

Same

four times

Half

67. A current of 0.3 a flows through a resistance of 50Ω Calculate voltage across it.*

1 Mark

1.5V

17V

1.7V

15V

78. A wire of resistance R is divided into 2 equal parts and these two wires are now connected in parallel. The equivalent resistance will be __________*

1 Mark

R/2

R/4

69. To obtain maximum resistance, the given resistors should be connected in _________*

1 Mark

none of these

Combination of series and parallel

Parallel

Series

70. The _________ of energies possessed by _________ is known as valence band*

1 Mark

Value, atoms

range, atoms

range, valence electrons

Amount, electrons

71. The energy gap between valence band and conduction band is called as _________*

1 Mark

forbidden gap

insulation gap

Conduction band

Valence band

72. Semiconductor is a material having conductivity __________*

1 Mark

Less than insulator

None of these

Less than conductor and more than insulator

Less than conductor and insulator

73. Electric conductor is the material through which ________*

1 Mark

Heat conducts but current does not conduct

None of these

Electric current does not flow

Electric current conducts speedily and easily

74. Which of the following is not a example of good conductor of electricity?*

1 Mark

Mica

Aluminium

Copper

Brass

75. At 0˚K pure silicon is ________*

1 Mark

an insulator

conductor

Semiconductor

Extrinsic semiconductor

76. Majority charge carries in P-type extrinsic semiconductor are _________*

1 Mark

none of these

holes

Electrons

Free electrons

77. To prepare P-type Semiconductor, ________ type of atoms are added to S i or G e.*

1 Mark

tetravalent

Pentavalent

none of these

Hectavalent

78. Impurities like gallium, indium, boron, aluminium which produce P-type semiconductors are knows as _________*

1 Mark

Material impurity

Donor impurities

Conductors

Acceptor impurities

79. Pure silicon and germanium are called __________*

1 Mark

Intrinsic semiconductors

none of these

Doped semiconductors

Extrinsic semiconductors

79. The conductivity of semiconductors depends on __________*

1 Mark

Conduction band

Valence band

none of these

Energy gap

80. ________ and ________ are the example of pentavalent impurity.*

1 Mark

Arsenic and boron

Arsenic and antimony

Boron and antimony

Galium and indium

81. The electrical conductivity of a semiconductor at absolute zero is ________*

1 Mark

Large

Infinite

Small

Zero

82. As temperature of a semiconductor increases, its conductivity ________*

1 Mark

Remains constant

Decreases

Increases

Decreases and Increases

83. As temperature of a semiconductor increase, its resistance __________*

1 Mark

Remains constant

Decreases

Decreases and Increases

Increases

84. The electrical resistance of a PN junction is ___________ during forward bias.*

1 Mark

High

Infinite

Low

none of these

85. Because of accumulation of holes and electrons in the depletion layer, an electric field V3 is developed in the depletion layer is called ___________*

1 Mark

Forward potential

Barrier potential

none of these

Reverse potential

86. In forward biased PN junction diode _______*

1 Mark

Both the sides are connected to + ve of battery

P side is connected to + ve of battery and N side is connected to – ve of battery

Both the sides are connected to – ve of battery

P side is connected to – ve of battery and N side is connected to + ve of battery

87. What is the relationship between resistance and current?*

1 Mark

The resistance has a greater magnitude than current.

The current has a greater magnitude than resistance.

They are inversely related to each other.

They are directly related to each other.

88. How much more heat is produced, if the current is doubled?*

1 Mark

thrice the original amount

five times the original amount

four times the original amount

twice the original amount

89. Two resistors connected in series give an equivalent resistance of 10 Ω. When connected in parallel, give 2.4 Ω. Then the individual resistance is*

1 Mark

6 Ω and 4 Ω

7 Ω and 4 Ω

8 Ω and 2 Ω

each of 5 Ω

90. Which of the following statements is true about magnetic lines of force?*

1 Mark

Magnetic lines of force tend to crowd far away from the poles of the magnet

Magnetic lines of force are always closed.

Magnetic lines of force do not pass through the vacuum.

Magnetic lines of force always intersect each other.

91. Which among the following is the most commonly used semiconductor?*

1 Mark

Silicon

Sulphur

Germanium

Carbon

92. Which of the following is created when trivalent impurities are added to a semiconductor?*

1 Mark

Bound electrons

Valence electrons

Free electrons

Holes

93. If two charges 1.2 µc and 2.1 µc are placed at a distance of 2 mm then find the force (F) between them*

1 Mark

528 N

5670 N

628 N

567 J

94. If two charges 3.2 µc and 2.2 µc are placed at a distance of 4 mm then find the force (F) between them*

1 Mark

386 N

380 N

3960 N

375 J

95. Low resistance means ....and high resistance means _________*

1 Mark

Insulator, good conductor

bad conductor, good conductor

good conductor, bad conductor

Insulator, bad conductor

96. The resistance of a conductor at constant temperature depends on _________*

1 Mark

material of conductor

length

cross-sectional area

all of these

97. Electric potential is ________*

1 Mark

charge per unit work

charge per unit force

work done per unit charge

force per unit charge

98. which of the following is not property of bar magnet?*

1 Mark

it always rest in north-south direction

like poles attract each other and unlike poles repel each other

it attracts iron, nickel, steel

like poles repel each other and unlike poles attract each other

99. force between two charges separated by a certain distance in air is F if each charge is doubled and the distance between them is also doubled then force will be ___________*

1 Mark

F/2

100. Addition of pentavalent impurity to a semiconductor creates many ________*

1 Mark

Free electrons

Bound electrons

Holes

Valence electrons

101. A pentavalent impurity has _________ Valence electrons*

1 Mark

102. One eV is equal to ________ J.*

1 Mark

6.02 × 1023

6.25 × 1018

1.6 × 10–19

1.66 × 10–24

103. Two equal number of positive and negative charge is electrically _________*

1 Mark

decreases

neutral

increases

same

104. The like charges _________ each other and unlike charges _________ each other.*

1 Mark

Both attracts, repel and increases, decreases

Attracts, repel

Repel ,attracts

Increases, decreases

105. The proton and electrons creates electric fields which exerts a force called __________.*

1 Mark

Newton’s force

Joule’s force

Coulomb’s force

Ampere’s force

106. The unit of electric field intensity is ______*

1 Mark

N/C

Chromium oxide

Brown umber

Ferric oxide

112. The function of pigment is __________ *

1 Mark

improve the drying quality of paint

prevent gelling and skinning of the paint film

provides opacity to the paint

reduces the fluidity of paint

113. A thermoplastic polymer is formed by the phenomenon of *

1 Mark

addition polymerization

Crystallization

condensation polymerization

None of above

114. Select the adhesive which is used in the sealing operation in food industry *

1 Mark

silicon resins

Polyvinyl

cellulose derivatives

epoxy resins

First Semester Basic Physics Question Bank

Chapter 2 Electricity, Magnetism & Semiconductor

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