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Engineering Physics Quiz

Total questions: 150

Worksheet time: 50mins

Name
Class
Date
1.

The concept of matter wave was suggested by

a)

Heisenberg

b)

De Broglie

c)

Schrödinger

d)

Laplace

2.

The total probability of finding the particle in space must be

a)

Zero

b)

Unity

c)

Infinity

d)

Double

3.

The square of the magnitude of the wave function is called

a)

Current density

b)

Zero density

c)

Probability density

d)

Volume density

4.

The function representing matter waves must be

a)

Complex

b)

Real

c)

zero

d)

Infinity

5.

Calculate the Zero-point energy for a particle in an infinite potential well for an electron confined to a 1 nm atom.

a)

3.9 X 10-29 J

b)

4.9 X 10-29 J

c)

5.9 X 10-29 J

d)

6.9 X 10-29 J

6.

The walls of a particle in a box are supposed to be

a)

Small but infinitely hard

b)

Infinitely large but soft

c)

Soft and Small

d)

Infinitely hard and infinitely large

7.

The uncertainty in the location of a particle is equal to its de Broglie wavelength then uncertainty in its velocity will be

a)

Its velocity

b)

half of its velocity

c)

Twice its velocity

d)

Four times of its velocity

8.

Uncertainty principle states that the error in measurement is due to

a)

dual nature of particles

b)

due to small size of particles

c)

due to large size of particles

d)

due to error in measuring instruments

9.

The uncertainty in the location of a particle is equal to its de-broglie wavelength, then uncertainty in its velocity will be

a)

its velocity

b)

half of its velocity

c)

twice its velocity

d)

four times of its velocity

10.

The uncertainty relation cannot hold for the following pairs

a)

position and momentum

b)

energy and time

c)

linear momentum and angle

d)

angular momentum and angle

11.

The equation of motion of matter waves was derived by

a)

Heisenberg

b)

de- Broglie

c)

Schrödinger

d)

Bohr

12.

Matter waves are

a)

Elastic waves

b)

Electromagnetic waves

c)

show diffraction

d)

transverse waves

13.

If the momentum of a particle is increased to four times, then the de-Broglie wavelength will become

a)

two times

b)

four times

c)

half times

d)

one fourth times

14.

The wavelength of the matter waves is independent of

a)

mass

b)

velocity

c)

charge

d)

momentum

15.

Matter waves are first experimentally observed by

a)

de-Broglie

b)

Schrödinger

c)

Davisson and Germer

d)

Bohr

16.

Which of the following can act as both a particle and as a wave?

a)

photon

b)

electron

c)

neutron

d)

all of these

17.

The wave function of the particle lies in which region?

a)

x > 0

b)

x < 0

c)

0 < X < L

d)

x > L

18.

For a particle inside a box, the potential is maximum at x =

a)

L

b)

2L

c)

L/2

d)

3L

19.

For a quantum wave particle, E =

a)

ℏ k

b)

ℏ ω

c)

ℏ ω/2

d)

ℏ k/2

20.

Schrodinger Wave equation can be derived from Principles of Quantum Mechanics.

a)

True

b)

False

21.

Which of the following can be a wave function?

a)

tan x

b)

sin x

c)

cot x

d)

sec x

22.

Which of the following is not a characteristic of wave function?

a)

Continuous

b)

Single valued

c)

Differentiable

d)

Physically Significant

23.

dΨ/dx must be zero.

a)

True

b)

False

24.

Any wave function can be written as a linear combination of

a)

Eigen Vectors

b)

Eigen Values

c)

Eigen Functions

d)

Operators

25.

For 3-D system, the Schrödinger equation changes.

a)

True

b)

False

26.

What is the most fundamental property of wave?

a)

Temperature

b)

Pressure

c)

Frequency

d)

Wavelength

27.

The Schrodinger wave equation is

a)

Linear

b)

Quadratic

c)

Differential equation

d)

Derivable

28.

Two solutions of Schrodinger Wave equation obey Superposition principle.

a)

True

b)

False

29.

De Broglie wavelength of an electron which has been accelerated from rest through a potential difference of 100 V is

a)

12.27 Å

b)

1.227 Å

c)

15 Å

d)

1.5 Å

30.

A proton with energy of 2.05 MeV has a de Broglie wavelength of

4 lines
31.

An electron is in a box of 2 nm. What will be the lowest energy for the electron?

a)

0.01 eV

b)

0.08375 eV

c)

0.2 eV

d)

1.5 eV

32.

Calculate the de-Broglie wavelength of neutron of energy 28.8 eV.

4 lines
33.

An electron is confined to a box of length 1.1 ×10-8 m. What is the minimum uncertainty in its velocity?

4 lines
34.

Which phenomena from the following is showing particle nature:

a)

Interference

b)

Diffraction

c)

Polarization

d)

Photoelectric

35.

The relation provided by de-Broglie was:

a)

λ = h/p

b)

λ = h/mv

c)

both a and b

d)

None of these

36.

The expression for group velocity is:

a)

dω/dk

b)

v λ

c)

ω/k

d)

None

37.

Which expression is used to show that phase velocity[vp] exceeds the speed of light[c]:

a)

vp = c^2/v

b)

vp = c^2/v

c)

vp = 2c^2

d)

vp = 4c^2

38.

The group velocity is: [for relativistic]

a)

Equal to particle velocity(vp)

b)

Greater than v

c)

Low than v

d)

Can’t be said

39.

For a non-relativistic free particle:

a)

vp = vg/2

b)

vg = vp/2

c)

vp = 2c

d)

vg = h^2/m

40.

In case of a dispersive medium:

a)

Vg is less than vp

b)

Vg is greater than vp

c)

Can’t be said

d)

May be same

41.

For which pair Heisenberg’s principle acts:

a)

Position and momentum

b)

Energy and time

c)

Orbital angular momentum and angular position

d)

All

42.

What is the minimum Energy possessed by the particle in a box?

a)

Zero

b)

π^2 ℏ^2/2mL^2

c)

π^2 ℏ^2/2mL

d)

π^2 ℏ/2mL

43.

Operator of momentum is given as:

4 lines
44.

Operator of energy is given as:

4 lines
45.

The particle with wave function Ae^kx + Be^-kx represents ____________

a)

Oscillating particle

b)

Moving Particle

c)

Probable Particle

d)

No such wave function

46.

Quantum Numbers are solutions of _____________

a)

Heisenberg’s Uncertainty Principle

b)

Einstein’s mass energy relation

c)

Schrodinger’s Wave Equation

d)

Hamiltonian Operator

47.

If Ψ is the wave function, the probability density function is given by _____________

a)

|Ψ|

b)

|Ψ|^2

c)

|Ψ|^3

d)

|Ψ|^4

48.

A photon and an electron have the same wavelength then

a)

photon has greater momentum

b)

electron has greater momentum

c)

both have same momentum

d)

none of the above

49.

The rest mass of a photon is

a)

zero

b)

infinity

c)

9.1 × 10-31 kg

d)

9.1 × 10^31 kg

50.

Assuming the velocity to be same, which particle is having the longest wavelength

a)

an electron

b)

a proton

c)

a neutron

d)

an α particle

51.

A wavefunction ψ is normalized, if

a)

∫ψψ* dV= ∞

b)

∫ψψ* dV= 0

c)

∫ψψ* dV= 1

d)

∫ψψ* dV= V

52.

The idea of secondary wavelets for the propagation of a wave was first given by

a)

Newton

b)

Huygens

c)

Maxwell

d)

Fresnel

53.

Light propagates rectilinearly, due to

a)

wave nature

b)

wavelengths

c)

velocity

d)

frequency

54.

When interference of light takes place

a)

energy is created in the region of maximum intensity

b)

energy is destroyed in the region of maximum intensity

c)

conservation of energy holds good and energy is redistributed

d)

conservation of energy does not hold good

55.

To observe diffraction, the size of the obstacle

a)

should be X/2, where X is the wavelength.

b)

should be of the order of wavelength.

c)

has no relation to wavelength.

d)

should be much larger than the wavelength.

56.

For light diverging from a point source

a)

the wavefront is spherical.

b)

the intensity increases in proportion to the distance squared.

c)

the wavefront is parabolic.

d)

the intensity at the wavefront does not depend on the distance.

57.

The locus of all particles in a medium, vibrating in the same phase is called

a)

wavelet

b)

fringe

c)

wave front

d)

None of these

58.

The device which produces highly coherent sources is

a)

Fresnel biprism

b)

Young’s double slit

c)

Laser

d)

Lloyd’s mirror

59.

When a film is illuminated by white light, its upper portion appears dark. Path difference between two reflected beams at the spot must be

a)

zero

b)

λ/2

c)

2 λ/2

d)

π

60.

Coherence is a measure of

a)

capability of producing interference by wave

b)

waves being diffracted

c)

waves being reflected

d)

waves being refracted

61.

Intensity of light depends on

a)

amplitude

b)

frequency

c)

wavelength

d)

velocity

62.

The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be

a)

violet

b)

red

c)

green

d)

yellow

63.

Laser light is considered to be coherent because it consists of

a)

many wavelengths

b)

uncoordinated wavelengths

c)

coordinated waves of exactly the same wavelength

d)

divergent beam

64.

Which of the following is not essential for two sources of light in Young’s double slit experiment to produce a sustained interference?

a)

Equal wavelength

b)

Equal intensity

c)

Constant phase relationship

d)

Equal frequency

65.

When monochromatic light is replaced by white light in Fresnel’s biprism arrangement, the central fringe is

a)

coloured

b)

white

c)

dark

d)

None of these

66.

The phenomenon of diffraction can be treated as interference phenomenon if the number of coherent sources is

a)

one

b)

two

c)

zero

d)

infinity

67.

Two waves having their intensities in the ratio 9 : 1 produce interference. In the interference pattern the ratio of maximum to minimum intensity is equal to

a)

2 : 1

b)

9 : 1

c)

3 : 1

d)

4 : 1

68.

Interference occurs in:

a)

Longitudinal waves only

b)

Transverse waves only

c)

Electromagnetic waves only

d)

All above waves

69.

Newton’s rings are :

a)

Locus of points of equal thickness

b)

Locus of points of equal inclination

c)

Locus of points of equal thickness and or equal inclination

d)

Neither (a) nor (b)

70.

In interference with two coherent sources, the fringe width varies:

a)

Directly as wavelength

b)

Inversely as wavelength

c)

Directly as the separation between slits

d)

Inversely as the distance between the slits and screen.

71.

In Newton’s ring experiment, circular rings are formed

a)

by division of amplitude

b)

by division of wavelength

c)

by diffraction

d)

by polarization

72.

In Newton’s ring experiment, the expression for the measurement of wavelength is

a)

λ= D^2 n+p - D^2 n/4R

b)

λ= D^2 n+p - D^2 n/4pR

c)

λ= D^2 n+p - D^2 n*4pR

d)

λ= 4R/ D^2 n+p - D^2 n

73.

Diffraction of light is observed when the size of the obstacle is

a)

very large

b)

very small

c)

howsoever large or small

d)

comparable with the wavelength of light

74.

Two waves having their intensities in the ratio 9 : 1 produce interference. In the interference pattern the ratio of maximum to minimum intensity is equal to

a)

2 : 1

b)

9 : 1

c)

3 : 1

d)

4 : 1

75.

Two beams interfere have their amplitudes ratio 2 : 1. Then the intensity ratio of bright and dark fringes is

a)

2 : 1

b)

1 : 2

c)

9 : 1

d)

4 : 1

76.

In interference of light which of the following statement is correct :

a)

There is redistribution of light energy at the point of superposition.

b)

There is addition and cancellation of light energy at the point of superposition.

c)

There is reflection and refraction of light energy at the point of superposition.

d)

None of these

77.

Condition of destructive interference is :

a)

Path difference is even multiple of

b)

Path difference is odd multiple of

c)

Path difference is integral multiple of

d)

None of the above

78.

In Netwon’s rings, interference is due to light rays reflected from

a)

lower surface of lens and upper surface of glass plate.

b)

lower surface of glass plate and upper surface of lens.

c)

lower surface of lens and lower surface of glass plate.

d)

upper surface of lens and upper surface of glass plate

79.

In reflected light the central fringe of Newton’s ring is

a)

dark

b)

non-uniform

c)

bright

d)

none of them

80.

In Newton’s ring experiment, the diameter of bright rings is proportional to

a)

odd natural numbers

b)

natural numbers

c)

even natural numbers

d)

square root of natural numbers

81.

Extended source is needed in

a)

Young’s double slit experiment

b)

Biprism experiment

c)

Newton’s ring experiment

d)

none of them

82.

In transmitted light the central fringe of Newton’s ring is

a)

dark

b)

non-uniform

c)

bright

d)

none of them.

83.

Which of the following are coherent sources ?

a)

A 60 W and A 100 W bulbs

b)

Two bulbs each of 60 W

c)

Two halves of a 60 W bulbs

d)

The virtual sources obtained by a biprism

84.

In Newton’s rings experiment, bright and dark rings are obtained using sodium light. If the entire set-up is dipped into water the diameters of rings _______.

a)

increases

b)

decreases

c)

remains unchanged

d)

fringe pattern disappears

85.

In Young’s double slit experiment, if the monochromatic source of yellow light is replaced by red light. The fringe width

a)

increases

b)

decreases

c)

unchanged

d)

the fringes disappear

86.

Which will most likely occur when light passes through a double slit

a)

Interference only

b)

reflection

c)

diffraction only

d)

diffraction and interference both

87.

In transmitted system the centre of the Newtons’s ring appears.

a)

Dark

b)

Bright

c)

White

d)

None of the above.

88.

Maximum number of orders available with a grating is

a)

directly proportional to the wavelength

b)

inversely proportional to the grating element

c)

independent of grating element

d)

directly proportional to the grating element.

89.

In a plane transmission grating, as the number of slits increased, the maxima become

a)

less brighter and much narrower

b)

less brighter and less narrower

c)

much brighter and less narrower

d)

much brighter and much narrower

90.

In a plane transmission grating, the intensity of principal maximum

a)

increases as the number of slits increases.

b)

decreases as the number of slits increases.

c)

remains constant as the number of slits increases.

d)

none of these

91.

In a plane diffraction grating, the angle of diffraction is

a)

directly proportional to the wavelength.

b)

inversely proportional to the wavelength.

c)

directly proportional to the square root of the wavelength.

d)

inversely proportional to the square root of the wavelength

92.

The retina of the eye is sensitive only to colours in the visible region, i.e. wavelengths lying between?

a)

3900 Å and 7800 Å

b)

900 Å and 1800 Å

c)

1900 Å and 3800 Å

d)

7900 Å and 9900 Å

93.

The path difference between two interfering waves at a point on a screen is two times the wavelength. The point is

a)

bright

b)

dark

c)

neither dark nor bright

d)

nothing can be said

94.

The interference fringes formed by a thin film on water are seen in yellow light. We find the fringes

a)

White and dark

b)

Coloured

c)

Bright yellow and dark

d)

Coloured with yellow absent

95.

In single slit diffraction the width of the central maximum is greatest for the colour

a)

red

b)

yellow

c)

violet

d)

green

96.

The single slit diffraction arrangement is completely immersed in water. The fringe system

a)

expands

b)

contracts

c)

remains same

d)

disappears

97.

A crystalline solid:

a)

changes abruptly from solid to liquid when heated.

b)

has no definite melting point.

c)

undergoes deformation of its geometry easily

d)

has irregular 3-dimensional arrangements.

98.

When do ionic compounds conduct electricity?

a)

In gaseous state

b)

In solid state

c)

When dissolved in water

d)

They never conduct

99.

Which of the following covalent compounds conduct electricity?

a)

Silica

b)

Graphite

c)

Diamond

d)

Hydrogen chloride

100.

A n-type semiconductor is

a)

negatively charged.

b)

positively charged.

c)

neutral.

d)

none of these

101.

At absolute zero, Si acts as a

a)

metal

b)

semiconductor

c)

insulator

d)

none of these

102.

In good conductors of electricity the type of bonding that exist is

a)

Van der Walls

b)

covalent

c)

ionic

d)

metallic

103.

In an n-type silicon, which of the following statements is true.

a)

Electrons are majority carriers and trivalent atoms are the dopants’

b)

Electrons are minority carriers and pentavalent atoms are the dopants.

c)

Holes are minority carriers and pentavalent atoms are the dopants.

d)

Holes are majority carriers and trivalent atoms are the dopants.

104.

If a small amount of antimony is added to germanium crystal

a)

its resistance is increased

b)

it becomes a p-type semiconductor

c)

there will be more free electrons than holes in the semiconductor.

d)

none of these.

105.

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

a)

free electrons in the n-region attract them

b)

they move across the junction by the potential difference

c)

hole concentration in p-region is more as compared to n-region.

d)

all of these

106.

Region without free electrons and holes in a p-n junction is

a)

n-region

b)

p-region

c)

depletion region

d)

none of these

107.

Which of the following statements is incorrect for the depletion region of a diode?

a)

There the mobile charges exist.

b)

Equal number of holes and electrons exist, making the region neutral.

c)

Recombination of holes and electrons has taken place.

d)

None of these

108.

Potential barrier developed in a junction diode opposes the flow of

a)

minority carrier in both regions only

b)

majority carriers only

c)

electrons in p region

d)

holes in p region

109.

If in a n-type semiconductor when all donor states are filled, then the net charge density in the donor states becomes

a)

1

b)

> 1

c)

< 1, but not zero

d)

zero

110.

What happens during regulation action of a Zener diode?

a)

The current in and voltage across the Zener remains fixed.

b)

The current through the series resistance (R s) does not change.

c)

The Zener resistance is constant.

d)

The resistance offered by the Zener changes.

111.

Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity (a)   .

112.

When the electrical conductivity of a semiconductor is due to the breaking of its covalent bonds, then the semiconductor is said to be (a)   .

113.

Semiconductor acts as an insulator in the presence of impurities.

a)

True

b)

False

114.

How is the resistance of semiconductor classified?

a)

High resistance

b)

Positive temperature co-efficient

c)

Negative temperature co-efficient

d)

Low resistance

115.

What are the charge carriers in semiconductors?

a)

Electrons and holes

b)

Electrons

c)

Holes

d)

Charges

116.

Which of the following is known as indirect band gap semiconductors?

a)

Germanium

b)

Nickel

c)

Platinum

d)

Carbon

117.

Which column elements are combined to make compound semiconductors?

a)

First and fourth

b)

Fifth and sixth

c)

Second and fourth

d)

Third and fifth

118.

Compound semiconductors are also known as direct band gap semiconductors.

a)

True

b)

False

119.

How are charge carriers produced in intrinsic semiconductors?

a)

By pure atoms

b)

By electrons

c)

By impure atoms

d)

By holes

120.

What type of material is obtained when an intrinsic semiconductor is doped with pentavalent impurity?

a)

N-type semiconductor

b)

Extrinsic semiconductor

c)

P-type semiconductor

d)

Insulator

121.

What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?

a)

Extrinsic semiconductor

b)

Insulator

c)

N-type semiconductor

d)

P-type semiconductor

122.

Which method can be used to distinguish between the two types of carriers?

a)

Hall effect

b)

Rayleigh method

c)

Doppler effect

d)

Fermi effect

123.

What is the Fermi energy of a n-type semiconductor?

a)

E

b)

E (F) = (E c + E v)/2

c)

E F = (E c + E d)/2

d)

E F = (E v + E a)/2

124.

For semiconductors, the resistivity is inversely proportional to the temperature for semiconducting materials.

a)

True

b)

False

125.

What are the current carriers in semiconductors?

a)

Electrons and Protons

b)

Electrons and Nucleons

c)

Electrons and Photons

d)

Electrons and Holes

126.

Holes are the majority carries in Intrinsic Semiconductors.

a)

True

b)

False

127.

An n type germanium sample has a donor density of 10^21 /m^3. It is arranged in a Hall experiment having magnetic field of 0.5 T and the current density is 500 A/m^2. Find the Hall voltage if the sample is 3mm wide.

4 lines
128.

A current of 1μA flows in a copper strip of length 10 cm and width 5 cm along its length. The strip is placed in a magnetic field of strength 3×10^-6 weber/m^2 perpendicular to its length. If R_H = 0.55×10^10 volt-m / ampere weber, find the Hall voltage developed in it.

4 lines
129.

The Hall voltage is directly proportional to

a)

current

b)

electric field

c)

magnetic flux density

d)

all of above

130.

Electric field strength related to hall voltage is given by

a)

V_H d

b)

V_H /d

c)

V_H E

d)

Ed

131.

The Hall probe is made up of

a)

metals

b)

non metals

c)

semiconductor

d)

radioactive material

132.

In Hall effect, the voltage across the probe is known as

a)

hall voltage

b)

emf

c)

potential difference

d)

none of above

133.

When the pn junction is forward biased the sequence of events that take place are

a)

diffusion, drift and recombination.

b)

injection, diffusion and recombination.

c)

diffusion, injection and drift.

d)

none of above.

134.

The depletion region of a pn junction is one, that is depleted of

a)

atoms.

b)

mobiles charges.

c)

immobile charges.

d)

velocity of the carriers.

135.

The depletion region within a pn junction is reduced when the junction has:

a)

zero bias.

b)

forward bias.

c)

reverse bias.

d)

all of these.

136.

A silicon pn junction in forward condition has a voltage drop closer to

a)

0.1 V.

b)

0.7 V.

c)

1.7 V.

d)

2.1 V.

137.

The reverse saturation electric current of a pn junction varies with temperature (T) as

a)

T.

b)

1 / T.

c)

independent of T.

d)

T^2.

138.

The arrow direction in diode symbol indicates

a)

direction of electron flow.

b)

direction of hole flow.

c)

opposite to the direction of hole flow.

d)

none of these.

139.

The knee voltage (cut in voltage) of silicon diode

a)

0.2 V.

b)

0.7 V.

c)

0.8 V.

d)

1.0 V.

140.

When the diode is forward biased, it is equivalent to

a)

an off switch.

b)

an on switch.

c)

a high resistance.

d)

none of the above.

141.

Avalanche breakdown in a diode occurs when

a)

potential barrier is reduced to zero.

b)

forward electric current exceeds certain value.

c)

reverse bias exceeds a certain value.

d)

none of the above.

142.

In what state is a silicon diode if the voltage drop across it is about 0.7 V?

a)

No bias

b)

Forward bias

c)

Reverse bias

d)

Zener region

143.

One that is based on forward biased PN junction is

a)

photo diode

b)

LED

c)

photo voltaic cell

d)

both a and b

144.

The diode characteristic curve is a plot between

a)

current and time

b)

voltage and time

c)

voltage and current

d)

both a and b

145.

Photo diode is used for the detection of

a)

visible light

b)

invisible light

c)

no light

d)

both a and b

146.

What is true about the breakdown voltage in a zener diode?

a)

It decreases when electric current increases.

b)

It destroys the diode.

c)

It equals the electric current times the resistance.

d)

It is approximately constant.

147.

Which of these is the best description of a zener diode?

a)

It is a rectifier diode.

b)

It is a constant voltage device.

c)

It is a constant electric current device.

d)

It works in the forward region.

148.

The voltage across the zener resistance is usually

a)

small.

b)

large.

c)

measured in volts.

d)

subtracted from the breakdown voltage.

149.

An ideal voltage regulator has a voltage regulation of

a)

1.

b)

100.

c)

50.

d)

0.

150.

Hall coefficient for n type semiconductor is given by

a)

R_H = -1/ne

b)

R_H = 1/ne

c)

R_H = -ne

d)

R_H = Jne

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