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Practical Skills assessment (Electricity,magnetism,semiconductors)

Total questions: 130

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

At Absolute temperature (0K) semiconductors are

a)

Insulators

b)

Conductors

c)

Superconductors

d)

Ideal semiconductor

2.

Which is NOT true about magnets?

a)

Magnetic field lines form closed loops

b)

Magnetic fields are caused by moving charges

c)

Magnetic monopoles exists

3.

Diamagnets

a)

are permanent magnets

b)

are not magnets themselves, but respond to permanent magnets

c)

are anti-magnets

d)

demonstrate no magnetic behavior

4.

S I unit of conductivity is

a)

mho m -1

b)

mho m

c)

ohm m

5.

Alternate form of Ohm's Law is

a)

E = σJ

b)

J = σE

6.

Drift velocity is

a)

-e E t/m, where t is relaxation time

b)

-e tm/E, where t is relaxation time

c)

-e E m/t, where t is relaxation time

d)

e E t/m, where t is relaxation time

7.

Name the factors decide internal resistance of a cell

a)

1. temperature

b)

2. nature of the electrolyte

c)

3. nature of the electrodes

d)

4.distance between the electrodes

e)

1,2,3 & 4

8.

What is emf?

a)

the electro motive "force" or the force on electrons

b)

the electromotive "force" or the Voltage of a cell measured when there is no current flowing

c)

the electromotive "field" or the Voltage of a cell measured when there is no current

d)

the electromotive "force" or Voltage of a cell measured when connected to a circuit

9.

Which among these is NOT a semiconductor

a)

Germanium

b)

Silicon

c)

Gallium Arsenide

d)

Titanium

10.

A resistor is connected to an AC power supply. On this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

11.

What is the equation for the force on a moving charge

a)

F=qvB

b)

F=qv/B

c)

9.8 N/kg

d)

None of the above

12.

41. In the process of electromagnetic induction:

a)

(a) Mechanical work is transformed in the form of electrical energy

b)

(b) Chemical energy is converted in the form of electrical energy

c)

(c) Electrical energy is transformed in the form of mechanical work

d)

(d) Electrical energy is transformed in the mechanical energy

13.

By which instrument, the presence of magnetic field be determined?

a)

Magnetic Needle

b)

Ammeter

c)

Galvanometer

d)

Voltmeter

14.

Unit of magnetic moment is ----------

(a)  

15.

To convert galvanometer in to a voltmeter of given range, a suitable high resistance should

be connected in (a)   with the galvanometer.

16.

If in a moving coil galvanometer, a current I in its coil produces a deflection Θ , then

a)

I ∝Θ²

b)

I ∝Θ

c)

I ∝ tanΘ

d)

I ∝ √Θ

17.

Best way of obtaining ideal ammeter and ideal voltmeter in your laboratory is by

a)

Using ammeter of low resistance and voltmeter of high resistance separately

b)

Using voltmeter of high resistance in series

c)

Obtaining ammeter and voltmeter using galvanometer instead of directly using them individually

d)

We can't obtain it in anyway

18.

Current sensitivity of a galvanometer can be increased by decreasing :

a)

Magnetic field B

b)

Number of turns N

c)

Area of coil A

d)

Torsional constant K

19.

To convert a moving coil galvanometer into on ammeter of given range, we must connect:

a)

A suitable low resistance in series

b)

A suitable low resistance in parallel

c)

A suitable high resistance in series

d)

A suitable high resistance in parallel

20.

In N-type Semiconductor, the Fermi energy level (EF) lies

a)

between Ec and ED

b)

between Ec and Ev

c)

between ED and Ev

d)

inside the valence band

21.

Which of the following is an example of an organic semiconductor?

a)

Copper

b)

Silicon

c)

Anthracene

d)

Gallium Arsenide

22.

What happens to electrons in semiconductors at absolute zero?

a)

They flow freely

b)

They are bound to atoms

c)

They are absent

d)

They conduct electricity

23.

Which of the following has very low conductivity?

a)

Copper

b)

Silicon

c)

Glass

d)

Germanium

24.

Describe the IV characteristics of a diode.

a)

The IV characteristics of a diode show exponential current increase in forward bias and minimal current in reverse bias until breakdown.

b)

The IV characteristics of a diode show linear current increase in both forward and reverse bias.

c)

Diodes conduct current equally in both directions regardless of bias.

d)

The IV characteristics of a diode are constant with no change in current for any voltage.

25.

Which among these is NOT the property of a semiconductor?

a)

Four electrons in the valence band forming covalent bonds

b)

At 0 Kelvin semiconductor acts like an insulator

c)

Semiconductors have two type of charge carriers

d)

Semiconductors are temperature insensitive

26.

During formation of p-n junction

a)

an electron diffuses from n to p side

b)

a hole diffuses from p to n side

c)

a hole diffuses from n to p side

d)

an electron diffuses from p to n side

27.

conductivity of semiconductor increases with increase in temperature, because

a)

number density of free charge carriers increases

b)

relaxation time increases

c)

both number density of free charge carriers and relaxation time increases

d)

number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

28.

A full-wave rectifier consist of _______________________________

a)

1 Diode

b)

2 Diode

c)

3 Diode

d)

4 Diode

29.

Basic principle of moving coil galvanometer

a)

Current carrying coil when placed in magnetic field experiences Torque

b)

Current carrying coil induces emf in itself

c)

Force acts on needle which deflects it

30.
The reverse saturation current in a PN Junction diode is only due to 
a)
majority carriers
b)
minority carriers
c)
acceptor ions
d)
donor ions
31.

Induced Emf=Blv is known as

a)

Faraday right hand rule

b)

Right hand thumb rule

c)

Flemings left hand rule

d)

Motional emf

32.
3. Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
a)
(a) Boron 
b)
Arsenic
c)
Indium
d)
Gallium
33.
2. The forbiddenn energy gap for Germanium is of the order of
a)
(a) 0.7 eV
b)
(b) 0.3 eV
c)
(c) 1.1 eV
d)
(d) 10 eV
34.

A METER BRIDGE is based on principal of

(a)  

35.

1 hp =

a)

220V

b)

746W

c)

5Hz

d)

3.3×106 J

36.

Figure of merit of galvanometer (G) is

a)

I/ alpha = torsion constant/NBA

b)

Alpha/I

37.

Resistance of an ideal ammeter is (a)  

38.

An ammeter is

a)

Pair of conducting wire and cell

b)

Pair of galvanometer and shunt in series

c)

Pair of galvanometer and shunt in parallel

d)

Galvanometer fixed in parallel connection to voltmeter

39.

What are phasors?

4 lines
40.

SI unit of magnetic flux is

a)

Maxwell

b)

Gauss

c)

Weber

d)

Tesla

41.

Phenomenon of Electromagnetic induction (EMI) was discovered by

a)

Lenz

b)

Fraday

c)

Gauss

d)

Maxwell

42.

According to Lenz law

a)

Direction of induced current is such that it enhances the reason/cause behind it

b)

Direction of current is such that it opposes the cause that produces it

c)

It obeys law of conservation of energy

d)

Work done against force of repulsion /attraction appears as electric energy in form of induced current

43.

Methods of generating induced emf are

a)

Changing magnetic field

b)

Changing area of coil

c)

Changing relative orientation of magnetic field and area of coil

d)

All of the above

44.

SI unit of induction is

a)

Henry

b)

Weber

c)

Hertz

d)

Farad

45.

Device used to convert low Vac to high is

(a)  

46.

Step up transformer works on principle of

a)

Eddy currents

b)

EMI

c)

Self induction

d)

Mutual induction

47.

Is Eddy current produced in transformer?

a)

No

b)

Yes

48.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

49.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

50.

What is emf?

a)

the electro motive "force" or the force on electrons

b)

the electromotive "force" or the Voltage of a cell measured when there is no current flowing

c)

the electromotive "field" or the Voltage of a cell measured when there is no current

d)

the electromotive "force" or Voltage of a cell measured when connected to a circuit

51.

kilowatt hour is unit of

a)

energy

b)

power

c)

momentum

d)

force

52.

what property does the wheatstone bridge system use?

a)

pressure

b)

expansion

c)

resistance

d)

radiation

53.

if the temperature increases then the resistance..

a)

increases

b)

decreases

54.

how many types of resistors are needed in the wheatstone bridge?

a)

1

b)

2

c)

3

d)

4

55.

When is the Wheatstone bridge is most sensitive ?

a)

When all the four resistances of the bridge are equal

b)

When the bridge is balanced

c)

When high amount of current is flowing through the bridge

d)

When a very low amount of current is flowing through the bridge

56.

Which type of transformer is used by a power station to transport electricity to cities?

a)

Step Down

b)

Step Up

c)

Either of the two types

d)

Neither of the two types

57.

Which coil has more turns in a step-down transformer?

a)

Primary Coil

b)

Secondary Coil

c)

Both have an equal no. of turns

58.

In a step-down transformer

a)

Both current and Voltage decrease

b)

Both current and Voltage increase

c)

Voltage decreases, Current increases

d)

Voltage increases, Current decreases

59.

In which arrangement will the magnetic field be stronger?

a)

A single cable

b)

Multiple cables

c)

A cable wrapped into a coil

60.

Interference of light is evidence that ___________.

a)

the speed of light is very large

b)

light is a transverse wave

c)

light is electromagnetic in character

d)

light is a wave phenomenon

61.

The two waves interfere destructively if path difference between them is equal to

a)

nλ

b)

(2n+1) λ/2

c)

Zero

d)

(2n+1) λ

62.

Which of the following does not show any interference pattern?

a)

Soap bubble

b)

Excessively thin film

c)

A thick film

d)

Wedge Shaped film

63.

A diverging lens produces an images of a real object. This image is ...........

a)

virtual, larger than the object, and upright.

b)

virtual, smaller than the object, and upright.

c)

virtual, smaller than the object, and inverted.

64.

Which of the following statement is correct?

a)

Refractive index of core and cladding are equal.

b)

Refractive index of core is more then that of cladding.

c)

Refractive index of core is less then that of cladding.

d)

Refractive index of core is less or equal to that of cladding.

65.

A measurement of the ability of an optical fibre to capture light is called

a)

acceptance angle.

b)

cladding.

c)

numerical aperature.

d)

critical angle.

66.

At Absolute temperature (0K) semiconductors are

a)

Insulators

b)

Conductors

c)

Superconductors

d)

Ideal semiconductor

67.

Which is NOT true about magnets?

a)

Magnetic field lines form closed loops

b)

Magnetic fields are caused by moving charges

c)

Magnetic monopoles exists

68.

Diamagnets

a)

are permanent magnets

b)

are not magnets themselves, but respond to permanent magnets

c)

are anti-magnets

d)

demonstrate no magnetic behavior

69.

S I unit of conductivity is

a)

mho m -1

b)

mho m

c)

ohm m

70.

Alternate form of Ohm's Law is

a)

E = σJ

b)

J = σE

71.

Drift velocity is

a)

-e E t/m, where t is relaxation time

b)

-e tm/E, where t is relaxation time

c)

-e E m/t, where t is relaxation time

d)

e E t/m, where t is relaxation time

72.

Name the factors decide internal resistance of a cell

a)

1. temperature

b)

2. nature of the electrolyte

c)

3. nature of the electrodes

d)

4.distance between the electrodes

e)

1,2,3 & 4

73.

What is emf?

a)

the electro motive "force" or the force on electrons

b)

the electromotive "force" or the Voltage of a cell measured when there is no current flowing

c)

the electromotive "field" or the Voltage of a cell measured when there is no current

d)

the electromotive "force" or Voltage of a cell measured when connected to a circuit

74.

Which among these is NOT a semiconductor

a)

Germanium

b)

Silicon

c)

Gallium Arsenide

d)

Titanium

75.

A resistor is connected to an AC power supply. On this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

76.

What is the equation for the force on a moving charge

a)

F=qvB

b)

F=qv/B

c)

9.8 N/kg

d)

None of the above

77.

41. In the process of electromagnetic induction:

a)

(a) Mechanical work is transformed in the form of electrical energy

b)

(b) Chemical energy is converted in the form of electrical energy

c)

(c) Electrical energy is transformed in the form of mechanical work

d)

(d) Electrical energy is transformed in the mechanical energy

78.

By which instrument, the presence of magnetic field be determined?

a)

Magnetic Needle

b)

Ammeter

c)

Galvanometer

d)

Voltmeter

79.

Unit of magnetic moment is ----------

(a)  

80.

To convert galvanometer in to a voltmeter of given range, a suitable high resistance should

be connected in (a)   with the galvanometer.

81.

If in a moving coil galvanometer, a current I in its coil produces a deflection Θ , then

a)

I ∝Θ²

b)

I ∝Θ

c)

I ∝ tanΘ

d)

I ∝ √Θ

82.

Best way of obtaining ideal ammeter and ideal voltmeter in your laboratory is by

a)

Using ammeter of low resistance and voltmeter of high resistance separately

b)

Using voltmeter of high resistance in series

c)

Obtaining ammeter and voltmeter using galvanometer instead of directly using them individually

d)

We can't obtain it in anyway

83.

Current sensitivity of a galvanometer can be increased by decreasing :

a)

Magnetic field B

b)

Number of turns N

c)

Area of coil A

d)

Torsional constant K

84.

To convert a moving coil galvanometer into on ammeter of given range, we must connect:

a)

A suitable low resistance in series

b)

A suitable low resistance in parallel

c)

A suitable high resistance in series

d)

A suitable high resistance in parallel

85.

In N-type Semiconductor, the Fermi energy level (EF) lies

a)

between Ec and ED

b)

between Ec and Ev

c)

between ED and Ev

d)

inside the valence band

86.

Which of the following is an example of an organic semiconductor?

a)

Copper

b)

Silicon

c)

Anthracene

d)

Gallium Arsenide

87.

What happens to electrons in semiconductors at absolute zero?

a)

They flow freely

b)

They are bound to atoms

c)

They are absent

d)

They conduct electricity

88.

Which of the following has very low conductivity?

a)

Copper

b)

Silicon

c)

Glass

d)

Germanium

89.

Describe the IV characteristics of a diode.

a)

The IV characteristics of a diode show exponential current increase in forward bias and minimal current in reverse bias until breakdown.

b)

The IV characteristics of a diode show linear current increase in both forward and reverse bias.

c)

Diodes conduct current equally in both directions regardless of bias.

d)

The IV characteristics of a diode are constant with no change in current for any voltage.

90.

Which among these is NOT the property of a semiconductor?

a)

Four electrons in the valence band forming covalent bonds

b)

At 0 Kelvin semiconductor acts like an insulator

c)

Semiconductors have two type of charge carriers

d)

Semiconductors are temperature insensitive

91.

During formation of p-n junction

a)

an electron diffuses from n to p side

b)

a hole diffuses from p to n side

c)

a hole diffuses from n to p side

d)

an electron diffuses from p to n side

92.

conductivity of semiconductor increases with increase in temperature, because

a)

number density of free charge carriers increases

b)

relaxation time increases

c)

both number density of free charge carriers and relaxation time increases

d)

number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

93.

A full-wave rectifier consist of _______________________________

a)

1 Diode

b)

2 Diode

c)

3 Diode

d)

4 Diode

94.

Basic principle of moving coil galvanometer

a)

Current carrying coil when placed in magnetic field experiences Torque

b)

Current carrying coil induces emf in itself

c)

Force acts on needle which deflects it

95.
The reverse saturation current in a PN Junction diode is only due to 
a)
majority carriers
b)
minority carriers
c)
acceptor ions
d)
donor ions
96.

Induced Emf=Blv is known as

a)

Faraday right hand rule

b)

Right hand thumb rule

c)

Flemings left hand rule

d)

Motional emf

97.
3. Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
a)
(a) Boron 
b)
Arsenic
c)
Indium
d)
Gallium
98.
2. The forbiddenn energy gap for Germanium is of the order of
a)
(a) 0.7 eV
b)
(b) 0.3 eV
c)
(c) 1.1 eV
d)
(d) 10 eV
99.

A METER BRIDGE is based on principal of

(a)  

100.

1 hp =

a)

220V

b)

746W

c)

5Hz

d)

3.3×106 J

101.

Figure of merit of galvanometer (G) is

a)

I/ alpha = torsion constant/NBA

b)

Alpha/I

102.

Resistance of an ideal ammeter is (a)  

103.

An ammeter is

a)

Pair of conducting wire and cell

b)

Pair of galvanometer and shunt in series

c)

Pair of galvanometer and shunt in parallel

d)

Galvanometer fixed in parallel connection to voltmeter

104.

What are phasors?

4 lines
105.

SI unit of magnetic flux is

a)

Maxwell

b)

Gauss

c)

Weber

d)

Tesla

106.

Phenomenon of Electromagnetic induction (EMI) was discovered by

a)

Lenz

b)

Fraday

c)

Gauss

d)

Maxwell

107.

According to Lenz law

a)

Direction of induced current is such that it enhances the reason/cause behind it

b)

Direction of current is such that it opposes the cause that produces it

c)

It obeys law of conservation of energy

d)

Work done against force of repulsion /attraction appears as electric energy in form of induced current

108.

Methods of generating induced emf are

a)

Changing magnetic field

b)

Changing area of coil

c)

Changing relative orientation of magnetic field and area of coil

d)

All of the above

109.

SI unit of induction is

a)

Henry

b)

Weber

c)

Hertz

d)

Farad

110.

Device used to convert low Vac to high is

(a)  

111.

Step up transformer works on principle of

a)

Eddy currents

b)

EMI

c)

Self induction

d)

Mutual induction

112.

Is Eddy current produced in transformer?

a)

No

b)

Yes

113.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

114.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

115.

What is emf?

a)

the electro motive "force" or the force on electrons

b)

the electromotive "force" or the Voltage of a cell measured when there is no current flowing

c)

the electromotive "field" or the Voltage of a cell measured when there is no current

d)

the electromotive "force" or Voltage of a cell measured when connected to a circuit

116.

kilowatt hour is unit of

a)

energy

b)

power

c)

momentum

d)

force

117.

what property does the wheatstone bridge system use?

a)

pressure

b)

expansion

c)

resistance

d)

radiation

118.

if the temperature increases then the resistance..

a)

increases

b)

decreases

119.

how many types of resistors are needed in the wheatstone bridge?

a)

1

b)

2

c)

3

d)

4

120.

When is the Wheatstone bridge is most sensitive ?

a)

When all the four resistances of the bridge are equal

b)

When the bridge is balanced

c)

When high amount of current is flowing through the bridge

d)

When a very low amount of current is flowing through the bridge

121.

Which type of transformer is used by a power station to transport electricity to cities?

a)

Step Down

b)

Step Up

c)

Either of the two types

d)

Neither of the two types

122.

Which coil has more turns in a step-down transformer?

a)

Primary Coil

b)

Secondary Coil

c)

Both have an equal no. of turns

123.

In a step-down transformer

a)

Both current and Voltage decrease

b)

Both current and Voltage increase

c)

Voltage decreases, Current increases

d)

Voltage increases, Current decreases

124.

In which arrangement will the magnetic field be stronger?

a)

A single cable

b)

Multiple cables

c)

A cable wrapped into a coil

125.

Interference of light is evidence that ___________.

a)

the speed of light is very large

b)

light is a transverse wave

c)

light is electromagnetic in character

d)

light is a wave phenomenon

126.

The two waves interfere destructively if path difference between them is equal to

a)

nλ

b)

(2n+1) λ/2

c)

Zero

d)

(2n+1) λ

127.

Which of the following does not show any interference pattern?

a)

Soap bubble

b)

Excessively thin film

c)

A thick film

d)

Wedge Shaped film

128.

A diverging lens produces an images of a real object. This image is ...........

a)

virtual, larger than the object, and upright.

b)

virtual, smaller than the object, and upright.

c)

virtual, smaller than the object, and inverted.

129.

Which of the following statement is correct?

a)

Refractive index of core and cladding are equal.

b)

Refractive index of core is more then that of cladding.

c)

Refractive index of core is less then that of cladding.

d)

Refractive index of core is less or equal to that of cladding.

130.

A measurement of the ability of an optical fibre to capture light is called

a)

acceptance angle.

b)

cladding.

c)

numerical aperature.

d)

critical angle.

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