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HSSTV 2

Total questions: 83

Worksheet time: 7hrs 55mins

Name
Class
Date
1.

The radius of a nucleus is given by

a)

R=R0AR = R_0 A

b)

R=R0A1/3R = R_0 A^{1/3}

c)

R=R0A2/3R = R_0 A^{2/3}

d)

R=R0AR = R_0 \sqrt{A}

2.

The approximate value of the nuclear radius constant R0R_0 is

a)

0.01 fm

b)

1.2 fm

c)

10 fm

d)

100 fm

3.

The density of nuclear matter is

a)

Different for different nuclei

b)

Much less than atomic density

c)

Nearly constant for all nuclei

d)

Proportional to atomic number

4.

The constancy of nuclear density implies that

a)

R∝AR \propto A

b)

R∝A1/3R \propto A^{1/3}

c)

M∝A2/3M \propto A^{2/3}

d)

Nuclear force is long range

5.

Most stable nuclei in ground state are approximately

a)

Cubical in shape

b)

Cylindrical in shape

c)

Spherical in shape

d)

Irregular in shape

6.

Non-spherical shape of heavy nuclei is mainly due to

a)

Gravitational attraction

b)

Coulomb repulsion

c)

Weak interaction

d)

Pairing force

7.

In the liquid drop model, nucleus is compared to a drop of liquid because

a)

It has colour

b)

It shows surface tension and incompressibility

c)

It flows

d)

It evaporates easily

8.

The volume energy term in the semi-empirical mass formula is due to

a)

Coulomb repulsion

b)

Surface nucleons

c)

Short range nuclear force

d)

Spin–orbit interaction

9.

Surface energy term arises because

a)

Protons repel each other

b)

Neutrons are unstable

c)

Surface nucleons have fewer neighbours

d)

Nucleus rotates

10.

Coulomb energy term in liquid drop model depends mainly on

a)

Neutron number

b)

Proton number

c)

Mass defect

d)

Nuclear spin

11.

Symmetry energy term becomes important when

a)

N=ZN = Z

b)

N≠ZN \ne Z

c)

Z=0Z = 0

d)

A=1A = 1

12.

Pairing energy is maximum when the nucleus has

a)

Odd ZZ and odd NN

b)

Even ZZ and odd NN

c)

Odd ZZ and even NN

d)

Even ZZ and even NN

13.

Liquid drop model successfully explains

a)

Magic numbers

b)

Discrete energy levels

c)

Nuclear fission

d)

Spin–orbit splitting

14.

Shell model of nucleus is analogous to

a)

Planetary model

b)

Liquid model

c)

Atomic shell model

d)

Solid state band model

15.

Magic numbers in nuclei are explained by

a)

Liquid drop model

b)

Shell model

c)

Bohr model

d)

Classical mechanics

16.

The origin of magic numbers is mainly due to

a)

Coulomb force

b)

Surface tension

c)

Spin–orbit coupling

d)

Gravitational force

17.

A nucleus with both proton number and neutron number equal to magic numbers is

a)

Highly unstable

b)

Highly radioactive

c)

Particularly stable

d)

Highly deformed

18.

The first magic number is

a)

1

b)

2

c)

4

d)

6

19.

Binding energy of a nucleus is the energy required to

a)

Remove one electron

b)

Break nucleus into protons only

c)

Break nucleus into its nucleons

d)

Excite nucleus to higher state

20.

Mass defect arises because

a)

Some mass is lost as heat

b)

Protons are heavier in nucleus

c)

Part of mass converts into binding energy

d)

Neutrons decay inside nucleus

21.

The binding energy per nucleon is maximum for nuclei around

a)

Hydrogen

b)

Uranium

c)

Iron

d)

Deuterium

22.

High binding energy per nucleon indicates that the nucleus is

a)

Highly unstable

b)

Weakly bound

c)

Highly stable

d)

Radioactive

23.

The energy released in nuclear fission is mainly due to

a)

Increase in mass

b)

Decrease in mass (mass defect)

c)

Chemical reaction

d)

Change in atomic number only

24.

According to the liquid drop model, nuclear force is

a)

Long range

b)

Repulsive only

c)

Short range and attractive

d)

Gravitational

25.

In the semi-empirical mass formula, the term that accounts for proton–proton repulsion is

a)

Volume term

b)

Surface term

c)

Coulomb term

d)

Pairing term

26.

The shell model assumes that nucleons move

a)

Freely like gas molecules

b)

In fixed orbits like electrons in atoms

c)

As a rigid body

d)

Only on the surface

27.

Which of the following is a magic number?

a)

10

b)

14

c)

20

d)

26

28.

The stability of doubly magic nuclei is explained by

a)

Liquid drop model

b)

Shell model

c)

Bohr model

d)

Classical mechanics

29.

Spin–orbit coupling in nucleus results in

a)

Nuclear fission

b)

Splitting of energy levels

c)

Pair production

d)

Beta decay

30.

The term in binding energy formula that reduces binding for large Z is

a)

Volume term

b)

Surface term

c)

Coulomb term

d)

Pairing term

31.

Nuclear radius is independent of

a)

Mass number

b)

Nuclear density

c)

Nuclear charge

d)

Nuclear constant R0

32.

The shape of a nucleus with closed shells is generally

a)

Highly deformed

b)

Elliptical

c)

Spherical

d)

Irregular

33.

The pairing energy is zero for nuclei with

a)

Even Z, even N

b)

Odd Z, odd N

c)

Even Z, odd N

d)

Odd Z, even N

34.

The liquid drop model fails to explain

a)

Nuclear fission

b)

Binding energy

c)

Magic numbers

d)

Nuclear density

35.

The shell model explains nuclear stability in terms of

a)

Surface tension

b)

Coulomb repulsion

c)

Closed energy shells

d)

Gravitational force

36.

The approximate radius of a nucleus with mass number 27 is

a)

R0

b)

3R0

c)

9R0

d)

27R0

37.

A large binding energy per nucleon implies

a)

Easy fission

b)

Easy fusion

c)

Greater stability

d)

Radioactivity

38.

The symmetry energy term favours

a)

Large difference between N and Z

b)

Equal number of protons and neutrons

39.

In heavy nuclei, deviation from spherical shape is mainly due to

a)

Nuclear force

b)

Weak force

c)

Coulomb repulsion

d)

Pairing force

40.

The shell model is particularly successful in explaining

a)

Nuclear fission

b)

Magic numbers and spin

c)

Nuclear density

d)

Surface tension

41.

The binding energy of a nucleus is equal to

a)

Δmc2\Delta mc^2

b)

mc2mc^2

c)

12mv2\frac{1}{2}mv^2

d)

hνh\nu

42.

The unit commonly used for nuclear binding energy is

a)

eV

b)

keV

c)

MeV

d)

GeV

43.

For light nuclei, energy is released mainly through

a)

Fission

b)

Fusion

c)

Radioactivity

d)

Ionisation

44.

The liquid drop model predicts that the nucleus is

a)

Compressible like gas

b)

Incompressible like liquid

c)

Elastic like solid

d)

Rigid like crystal

45.

Which term in the mass formula accounts for neutron–proton pairing?

a)

Volume term

b)

Surface term

c)

Coulomb term

d)

Pairing term

46.

The most stable nuclei are those with

a)

Very high Z

b)

Very low A

c)

Maximum binding energy per nucleon

d)

Minimum binding energy

47.

Magic numbers of neutrons or protons are

a)

1, 3, 5, 7

b)

2, 8, 20, 28, 50, 82, 126

c)

4, 9, 16, 25

d)

All even numbers

48.

A doubly magic nucleus has

a)

Equal N and Z

b)

Both N and Z even

c)

Both N and Z magic numbers

d)

Very large mass number

49.

Spin–orbit interaction in nucleus is

a)

Very weak

b)

Negligible

c)

Responsible for magic numbers

d)

Due to Coulomb force

50.

The shell model treats nucleons as moving in

a)

A common potential well

b)

Free space

c)

Circular orbits only

d)

Surface layer only

51.

The radius of a nucleus is proportional to

a)

AA

b)

A1/2A^{1/2}

c)

A1/3A^{1/3}

d)

A2/3A^{2/3}

52.

The nearly constant nuclear density implies that

a)

Nuclear force is long range

b)

Nucleus is compressible

c)

Volume is proportional to mass number

d)

Surface area is proportional to mass number

53.

The deformation of a nucleus is maximum for

a)

Magic nuclei

b)

Light nuclei

c)

Heavy nuclei

d)

Hydrogen

54.

The surface energy term in liquid drop model decreases binding because

a)

Surface nucleons are loosely bound

b)

Protons repel each other

c)

Neutrons decay

d)

Spin–orbit coupling

55.

Which model explains nuclear fission most successfully?

a)

Shell model

b)

Liquid drop model

c)

Atomic model

d)

Quantum field model

56.

The shell model is a

a)

Classical model

b)

Semi-classical model

c)

Quantum mechanical model

d)

Relativistic model

57.

The term responsible for stability of even–even nuclei is

a)

Symmetry energy

b)

Coulomb energy

c)

Pairing energy

d)

Volume energy

58.

The binding energy curve shows that

a)

Very heavy nuclei are most stable

b)

Very light nuclei are most stable

c)

Medium mass nuclei are most stable

d)

All nuclei have same stability

59.

Nuclear force between nucleons is

a)

Long range and repulsive

b)

Short range and attractive

c)

Long range and attractive

d)

Short range and repulsive only

60.

The shell model cannot explain properly

a)

Magic numbers

b)

Nuclear spin

c)

Nuclear fission

d)

Nuclear magnetic moment

61.

The binding energy per nucleon is lowest for

a)

Iron

b)

Carbon

c)

Uranium

d)

Helium

62.

The mass of a nucleus is always

a)

Equal to sum of masses of nucleons

b)

Greater than sum of masses of nucleons

c)

Less than sum of masses of nucleons

d)

Independent of nucleons

63.

The semi-empirical mass formula is based mainly on

a)

Shell model

b)

Liquid drop model

c)

Atomic model

d)

Quantum field theory

64.

The symmetry energy term is minimum when

a)

N=ZN = Z

b)

N>ZN > Z

c)

N<ZN < Z

d)

Z=0Z = 0

65.

The pairing energy is positive for

a)

Odd–odd nuclei

b)

Even–even nuclei

c)

Even–odd nuclei

d)

Odd–even nuclei

66.

The liquid drop model fails to explain

a)

Nuclear fission

b)

Nuclear density

c)

Magic numbers

d)

Binding energy trend

67.

The shell model explains nuclear spin mainly due to

a)

Orbital motion of nucleons

b)

Surface vibration

c)

Coulomb repulsion

d)

Nuclear rotation only

68.

A closed shell nucleus has

a)

Minimum binding energy

b)

Maximum deformation

c)

Extra stability

d)

High radioactivity

69.

The nuclear radius increases with mass number because

a)

Density decreases

b)

Volume is proportional to A

c)

Charge increases

d)

Force weakens

70.

The strong nuclear force is saturated because

a)

It is long-range

b)

Each nucleon interacts with all others

c)

Each nucleon interacts only with nearest neighbours

d)

It is repulsive

71.

The most stable isotope of iron is around

a)

A=12A = 12

b)

A=28A = 28

c)

A=56A = 56

d)

A=238A = 238

72.

The volume term in binding energy is proportional to

a)

AA

b)

A2A^2

c)

A1/3A^{1/3}

d)

A2/3A^{2/3}

73.

The Coulomb term in mass formula is proportional to

a)

ZZ

b)

Z2Z^2

c)

AA

d)

NN

74.

Which nucleus is expected to be most spherical?

a)

Deformed heavy nucleus

b)

Doubly magic nucleus

c)

Odd-A nucleus

d)

Very light nucleus

75.

The shell model is most suitable for explaining

a)

Nuclear fission

b)

Nuclear fusion

c)

Magic numbers

d)

Surface tension

76.

The pairing effect is absent in nuclei with

a)

Even Z, even N

b)

Odd Z, odd N

c)

Even Z, odd N

d)

Odd Z, even N

77.

The deformation of a nucleus decreases when

a)

Z increases

b)

A increases

c)

Shells are closed

d)

Temperature increases

78.

The binding energy per nucleon curve explains

a)

Atomic spectra

b)

Nuclear stability

c)

Photoelectric effect

d)

Compton effect

79.

A large surface energy implies

a)

Larger stability

b)

Smaller binding

c)

Larger mass defect

d)

Larger radius only

80.

The nucleus behaves like an incompressible fluid because

a)

Nuclear force is weak

b)

Nuclear force is long range

c)

Nuclear density is constant

d)

Nuclear mass is small

81.

The binding energy per nucleon decreases for very heavy nuclei mainly due to

a)

Surface energy

b)

Symmetry energy

c)

Coulomb repulsion

d)

Pairing energy

82.

The most stable nuclei are found near

a)

A=1A=1

b)

A=20A=20

c)

A=56A=56

d)

A=238A=238

83.

The liquid drop model considers the nucleus to be

a)

A collection of free particles

b)

A rigid solid

c)

An incompressible charged liquid drop

d)

A gaseous system

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