GRADE 12 – PHYSICS CHAPTER NO.10 NUCLEAR PHYSICS Test No.2 – Online MCQs MDCAT, UHS, PMC & ECAT Preparation

PHYSICS – 2nd Year
Chapter Name : NUCLEAR PHYSICS
Chapter No. 10 [ Test No. 2 ]
Multiple Choice Questions
Note : All MCQ’s selected in this test are from OLD F.Sc. board , UHS and PMC(Pakistan Medical Commission) Islamabad Papers.

Book Name : PHYSICS
Chapter No. 10 (Test No. 2 )
Chapter Name : NUCLEAR PHYSICS
Total MCQ from Text Book : 157
Book Version : 2020
Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade : 12 ( F.Sc. Intermediate)
Total Marks : 157
Total Time : 157 minutes 30 Seconds

GRADE 12 - PHYSICS CHAPTER NO.10 NUCLEAR PHYSICS Test No. 2

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GRADE 12 - PHYSICS CHAPTER NO.10 NUCLEAR PHYSICS Test No. 2

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Question 1

Consider α - particles, β - particles and r-rays each having an energy of 0.5MeV. In increasing order of penetrating power. The radiations ae

A	α, β, r
B	β, r, α
C	α, r, β
D	r,β, &alpha

Question 2

In alpha decay

A	Parent and daugher nuclei have same number of protons
B	Daughter nucleus has one netutron less than parent nucleus
C	Daughter nucleus has two protons less than partent nucleus
D	Daughter nucleus has one proton more than parent nucleus

Question 3

The half life of a radioactive element is given by:

A	T_1/2 = 0.93/λ
B	T_1/2 = 0.698/λ
C	T_1/2 = 0.693/λ
D	T_1/2 = 0.603 λ

Question 4

α, β and γ rays are emitted from a radioactive substances

A	When it is exposed to light
B	Spontaneously
C	When it is heated
D	None of these

Question 5

When a nucleus emits an alpha particle, its atomic mass decreases by (GRW 2016)

A	4
B	3
C	2
D	1

Question 6

Isotopes of the nucleus of uranium are:

A	²³⁸₉₂U
B	²³⁴₉₂U
C	All of these
D	²³⁵₉₂U

Question 7

Using relativistic effects the location of an air craft after an hr flight can be predicted about (BWP 2015)

A	760 m
B	20m
C	780 m
D	50m

Question 8

With emission of β-particle from the nucleus, the ratio of neutron to proton

A	None of above
B	decreases
C	Increases
D	remains same

Question 9

β-particles carries a charge

A	+2e
B	-2e
C	#NAME?
D	+4e

Question 10

Th minimum mass of fissionable material for self-sustaining chain reactor is called

A	The critical mass
B	All of these
C	The atomic mass
D	The nucelar mass

Question 11

The average life of the radioactive substance is

A	Sometimes less and sometimes equal to its half life
B	Equal to its half life
C	Greater than tis half life
D	Less than its half life

Question 12

Of the three basic gravitational, electrostatic and nuclear forces, which two are able to provide an attractive force between two neutrons?

A	Gravitational and electrostatic
B	Electrostatic and nuclear
C	Gravitational and nuclear
D	All of the above

Question 13

Natural uranium is a low grade fuel, it is due to high percentage of

A	²³⁸₉₂U
B	²³⁵₉₂U
C	²³⁴₉₂U
D	none of these

Question 14

Which of the following is the pair of isobars

A	₁H¹ and ₁H²
B	₁H² and ₁H³
C	₆C¹² and ₆C¹³
D	₁₅P³⁰ and ₁₄Si³⁰

Question 15

The reciprocal of the decay constant of a radioactive substance is known as

A	Total life
B	half life
C	mean life
D	none of the above

Question 16

Which of the following is energy equivalent to one microgarm (1μgm)?

A	9 x 10⁷ J
B	9 x 10¹⁰ erg
C	9 x 10⁷ erg
D	9 x 10¹⁰ J

Question 17

The number of protons in any atom are always equal to the number of: (LHR 2016 Group I)

A	Neutrons
B	Mesons
C	Posittrons
D	Electrons

Question 18

The ionization power of β particles

A	Less than α -particle
B	Equal to α-particle
C	equal to γ-particle
D	Greater than α-particle

Question 19

In the reaction X + ¹⁷₈O → ¹¹₇N + ⁴₂He, X is?

A	¹₁H
B	²₁H
C	¹_-1e
D	¹₀n

Question 20

1u = _____________

A	1.66 x 10^-35 kg
B	1.66 x 10^-19 kg
C	1.66 x 10^-31 kg
D	1.66 x 10^-27 kg

Question 21

Nucleus consists of

A	Proton and neutron
B	Electron, proton and neutron
C	Electron and neutron
D	Electron and proton

Question 22

The source of solar energy is mainly due to

A	Fusion
B	All of these
C	Fission
D	Pair production

Question 23

The constituents of nucleus are held together b

A	Strong force
B	Weak nuclear force
C	Gravitational force
D	Electromagnetic force

Question 24

For the treatment of skin diseases

A	γ-radiations are used
B	β-radiations are used
C	All of these
D	&alpha-radiations are used

Question 25

In the fission of ²³⁵._________ energy per nucleon is emitted

A	7.7 MeV
B	200 MeV
C	0.9 MeV
D	8.5 MeV

Question 26

If F_pp and P_nn and P_pn denotes, respectively the nuclear forces between two protons, between two neutrons and between proton and neutron then

A	F_pp = F_nn = F_pn
B	F_pp ≠ F_nn = F_pn
C	F_pp = F_nn ≠ F_pn
D	F_pp ≠ F_nn ≠ F_pn

Question 27

When a nucleus emits alpha particle, its charge number decreases by

A	3
B	2
C	6
D	5

Question 28

The probability of a radioactive atom to survive 5 times longer than its half period is

A	5-Feb
B	(2)^-5
C	(2)⁵
D	(5)²

Question 29

When a nucleus emits β-particle its mass number remains constant but charge number increases by:

A	4
B	2
C	3
D	1

Question 30

Which of the following is a better shield against γ-rays?

A	Ordinary water
B	Aluminium
C	Lead
D	Heavy water

Question 31

The binding energy per nucleus for uranium is about

A	200 MeV
B	8.5 MeV
C	28 MeV
D	7.7 MeV

Question 32

Which of the following are not hadrons? (RWP 2016)

A	Mesons
B	Protons
C	Neutrons
D	Muons

Question 33

The uncontrolled fission chain reaction results into the formation is

A	nuclear bomb
B	cobalt bomb
C	hydrogen bomb
D	none of these

Question 34

In Wilson cloud chamber, track of &alpha-particles is

A	all of these
B	Straight
C	Continuous
D	Thick

Question 35

Electric and magnetic forces were unified by:

A	Faraday and Maxwell
B	None of these
C	Faraday
D	Maxwell

Question 36

A pair of quark and anti-quark make a (SGD 20115 Group I)

A	Proton
B	Neutron
C	Electron
D	Meson

Question 37

Total charge on any nucleus is

A	Ae
B	Ne
C	Z/e
D	Ze

Question 38

The dead time of G.M tube is: (SWL 2015)

A	10^-3 sec
B	10^-8 sec
C	10^-4 sec
D	10^-6 sec

Question 39

The number isotopes of hydrogen are

A	1
B	4
C	2
D	3

Question 40

Enriched uranium is better as a fuel for a nuclear reactor because it has greater proportion of

A	U²³⁸
B	U²³⁹
C	U²³⁵
D	U²³³

Question 41

Xenon has 36 isotopes while cesium has ___________ isotopes

A	None of these
B	36
C	24
D	12

Question 42

The value of 1 mass = (SGD 2015 Goup II)

A	933 MeV
B	932 MeV
C	931 MeV
D	934 MeV

Question 43

The ionization energy of an atom compared to the binding energy of a nucleus is

A	More
B	Equal
C	Sometimes less and sometimes more
D	Less

Question 44

γ-emission from the nucleus of an atom causes a (SGD 2015 Group II)

A	Change in both A and Z
B	Change in A
C	No change in A and Z
D	Change inZ

Question 45

Structure of the nucleus was explained by

A	Rutherford
B	Milikan
C	Bohr
D	Thomson

Question 46

The activity of radioactive sample: (LHR 2016 Group II)

A	Decreases exponentially with time
B	Decreases linearly with time
C	Increases with time
D	Is constant

Question 47

A proton consists of quarks which are: (GRW 2015)

A	one up, two down
B	all up
C	all down
D	Two up, one down

Question 48

The most stable element is

A	Cobalt
B	Iron
C	Copper
D	Uranium

Question 49

After present unification, the number of fundamental forces are

A	2
B	3
C	4
D	5

Question 50

The building blocks of protons and neutrons are called: (LHR 2016 Group I)

A	Quarks
B	Electrons
C	Ions
D	Positrons

Question 51

Electrons are: (MTN 2015 Group II)

A	Quarks
B	Hardons
C	Baryons
D	Leptons

Question 52

A particle having the mass of electron and charge of proton is called

A	Photon
B	Meson
C	Positrons
D	Lepton

Question 53

Hydrogen bomb is an example of

A	Fusion reaction
B	Fission reaction
C	Chain reaction
D	Chemical reaction

Question 54

Marie Curie and Pierre Curie discovered two new radioactive elements which are

A	Plantinum and radium
B	Polonium and radium
C	Polonium and uraniam
D	Uranium and radium

Question 55

The half life of a radioactive element which ahas only 1/32 of its orininal mass left after a lapse of 60 days is

A	15 days
B	12 days
C	20 days
D	30 days

Question 56

A pair of Quark and Anti Qurak makes a: (BWP 2015)

A	Meson
B	Hardon
C	Baryon
D	Lepton

Question 57

Subatomic particles are divided into:

A	Leptons
B	All of these
C	Hardens
D	Photons

Question 58

During fission process, the energy release per nucleon is about

A	4 MeV
B	2 MeV
C	3 MeV
D	1 MeV

Question 59

The ionization power of α-particles is

A	Less than α -particle
B	greater than &beta-particle
C	equal to β-particle
D	equal to γ-particle

Question 60

The particles equal in mass or greater than protons are called

A	Leptons
B	Quarks
C	Baryons
D	Mesons

Question 61

Electromagnetic and weak forces were unified by

A	Abdul Salam
B	Weinberg
C	All of these
D	Glashow

Question 62

Weak nuclear force is

A	Medium range
B	Short range
C	none of these
D	Long range

Question 63

When a charged particle passes through matter, it produces ionization, this effect is used in

A	fusion reaction
B	radiation detector
C	reactor
D	fission reaction

Question 64

Hydrogen atoms with only one proton in its nucleus and one electron in its orbit is called

A	Deutron
B	Protium
C	Deuterium
D	Tritium

Question 65

The total number of protons in any atom are always equal to its number of

A	Mass number
B	None of these
C	Atomic number
D	Charge number

Question 66

Absorbed Dose "D" is defined as: (SWL 2015)

A	C/m
B	M/E
C	E/C
D	E/m

Question 67

Hydrogen atom with only one proton and two neutrons in its nuceleus and one electron in its orbt is called

A	Protium
B	Tritium
C	Deuterium
D	Deuteron

Question 68

Phophorus-32 or strontium-90 are used for the tratment of

A	All of these
B	Blood cancer
C	Bone cancer
D	Skin cancer

Question 69

Average number of neutrons produced in each fssion reaction are

A	5
B	6
C	3
D	4

Question 70

The number of neutrons in any nucleus can be given by

A	N = A - Z
B	N = Z-A
C	N = A/Z
D	N = A + Z

Question 71

Which one of the following is a radiation detector?

A	Solid state detector
B	All of these
C	Wilson cloud chamber
D	Geiger Muller counter

Question 72

₉₂U nucleus emits two α-particles and two β-particles and transforms into a thorium nucleus. Which of the following is the mass number and atomic number of the thorium nucleus so produced?

A	230,88
B	230,90
C	234,88
D	234,90

Question 73

α - particle carries a change: (GRW 2015)

A	-2e
B	+2e
C	#NAME?
D	no charge

Question 74

The energy released in the nuclear fission appears in the form of

A	K.E of fragments
B	P.E. of fragments
C	Light
D	Both a and b

Question 75

Subatomic particles are divided into:

A	Two groups
B	Five groups
C	Three groups
D	Four groups

Question 76

Various types of cancer are treated by

A	carbon-14
B	Strontium 90
C	cobalt-60
D	nickel-63

Question 77

In the equation, &inc; = -λ&inc; t λ is called

A	All of these
B	Decaying Element
C	Wavelength
D	Decay Constant

Question 78

Electromagnetic force is

A	none of these
B	Medium range
C	Short range
D	Long range

Question 79

Which of the following is a good nuclear fuel?

A	Thorium-236
B	Neptunium-239
C	Plutonium-239
D	Uranium-236

Question 80

In fission reaction, heavy water is used as a

A	coolant
B	all of these
C	moderator
D	heat exchanger

Question 81

The number o neutrons in the nucleus of ²³⁵₉₂U are

A	235
B	92
C	None of these
D	143

Question 82

The number of protons in any atom are always equal to its number of

A	Neutrons
B	Photons
C	Electrons
D	Positrons

Question 83

The SI unit of equivalent dose in Sievert(Sv) and

A	1 Sv = 1Gy + RBE
B	1 Sv = 1Gy / RBE
C	1 Sv = 1Gy x RBE
D	1 Sv = 1Gy - RBE

Question 84

γ - rays are electromagnetic waves like

A	light waves
B	x-rays
C	heat waves
D	all of these

Question 85

The unit of radioactivity "curie" is equal to

A	3.7 x 10⁹ disintegration per second
B	3.7 x 10¹⁰ disintegration per second
C	3.7 x 10⁷ disintegration per second
D	3.7 x 10⁸ disintegration per second

Question 86

One gary(Gy) is equal to: (GRW 2016)

A	1.6 x 10^-19 J
B	1.6 x 10^-10 J/kg
C	1 J/kg
D	4 J/kg

Question 87

The relation between rad and Gy is

A	1 rad = 0.01 Gy
B	1 rad = 0.1 Gy
C	1 rad = 1.0 Gy
D	1 rad = 0.001 Gy

Question 88

When γ-rays are emitted, the nuclear mass (RWP 2016)

A	Decreases by 4 units
B	Increases by 1 unit
C	Increases by 2 units
D	Does not change

Question 89

Cloud chamber was invented by

A	Rutherford
B	Lawrence
C	Muller
D	C.T.R Wilson

Question 90

The working principle of LMFBR (fast reactor) is to convert ²³⁸₉₂U into

A	²³⁹₉₂U
B	All of these
C	²³⁹₉₄U
D	²³⁵₉₂U

Question 91

Which of the following is not affected by the electric or magnetic field?

A	α-rays
B	All of these
C	β-rays
D	γ-rays

Question 92

The number of Quarks are (SGD 2015 Group II)

A	2
B	4
C	6
D	8

Question 93

The thin wire in the centre of G.M. tube is

A	Negatively charged
B	Positively charged
C	None of these
D	Neutral

Question 94

One gray(Gy) is equal to

A	1 J/kg
B	none of these
C	3.7 x 10¹⁰ J/kg
D	1.6 x 10^-19 J/kg

Question 95

The rate of decay of radioactive substance

A	Is constant
B	Decreases exponentially with time
C	Decreases linearly with time
D	Varies inveresly as time

Question 96

The LMFBR(fast reactor) reactr utilizes

A	²³⁸₉₂U
B	²³⁵₉₂U
C	²³⁹₉₂U
D	²³⁴₉₂U

Question 97

Alpha(α) particles are

A	Helium nuclei
B	Hydrogen nuclei
C	Electrons
D	Photons

Question 98

Nuclei having same charge number but different mass number are called

A	Isobars
B	Isotones
C	Isomers
D	Isotopes

Question 99

In fusion reaction, the energy released per nucleon is about(in p-p chain reaction)

A	2 MeV
B	6.4 MeV
C	5 MeV
D	15 MeV

Question 100

Track of γ-rays is

A	Irregualr
B	Continuous
C	Thick
D	Straight

Question 101

A radioactive isotope X with half life of 1.37 x 10⁹ years decays to Y which is stable. A samp[le of rocks from the moon was found to conain both X and Y in the ratio of 1:7 Which of the following is the age of rocks?

A	1.96 x 10⁹ years
B	9.59 x 10⁹ years
C	4.11 x 10⁹ years
D	3.85 x 10⁹ years

Question 102

Dr. Abdul Salam was awarded noble prize in

A	1989
B	1979
C	1985
D	1969

Question 103

Nuclei of different elements are identified by their

A	Atomic number
B	Nuclear charge
C	Nuclear number
D	Atomic mass number

Question 104

Ultra violet rays can cause

A	sunburn
B	All of these
C	severe crop damage
D	Skin cancer

Question 105

In a nuclear reactor, cadmium rods are used to

A	Speed up neutrons
B	Slow down neutron
C	Produce neutron
D	Absorb neutrons

Question 106

A radioactive substance has a half life of 4 months. Three-fourth of the substance will decays in

A	12 months
B	6 months
C	16 months
D	8 months

Question 107

The partilces lighter than protons are called

A	Baryons
B	Leptons
C	Quarks
D	Mesons

Question 108

Half life of a radioactive element T_1/2 is given by: (FSD 2015)

A	λ/0.693
B	1/0.693λ
C	0.693λ
D	0.693/λ

Question 109

Hydrogen atom with only one proton and one neutron in its nucleus and one electron in its orbit is called

A	Tritium
B	Protium
C	None of these
D	Deuterium

Question 110

1u (unified mass scale) is equivalent to

A	785 MeV
B	88 MeV
C	931 MeV
D	900 MeV

Question 111

The isotope ¹₁H contain

A	One neutron
B	No neutron
C	Two neutron
D	Three neutron

Question 112

The background radiation to which we are exposed on the average is

A	20 mSv per year
B	2 Sy per year
C	0.01 Sv
D	2 mSv per year

Question 113

When two deutterium nuclei fuse together to form a tritium nucleus, we get a

A	Alpha particle
B	Proton
C	Neutron
D	electron

Question 114

The moderator used in a nuclear reactor is: (LHR 2016 Group II)

A	Sodium
B	Uranium
C	Cadmium
D	Graphite

Question 115

Curie is a unit of

A	Binding energy
B	Conductivity
C	Resistivity
D	Radioactivity

Question 116

An old unit, the rem is equal to

A	0.1 Sv
B	0.001 Sv
C	0.01 Sv
D	1.0 Sv

Question 117

In heavier elements

A	N ≤ Z
B	N < Z
C	C < Z
D	N > Z

Question 118

Half life of Uranium-239 is: (MTN 2015 Group II)

A	26.5 minutes
B	25.5 minutes
C	23.5 minutes
D	24.5 minutes

Question 119

Radioactivity happens due to the disintegration of

A	Electrons
B	Protons
C	Nucleus
D	Neutron

Question 120

Both Xenon and cesium each have (D.G.Khan 2015 Group I)

A	35 isotopes
B	34 isotopes
C	33 isotopes
D	36 isotopes

Question 121

Half life of U-238 is: (MTN 2015 Group I)

A	3.5 x 10⁹ years
B	4.5 x 10⁹ years
C	5.5 x 10⁹ years
D	2.5 x 10⁹ years

Question 122

The process in which two or more light nuclei combine together to form heavier nuclei with release of energy is called

A	Fission reaction
B	Fusion reaction
C	Chemical reaction
D	Chain reaction

Question 123

Fusion reaction takes place at high temperature because

A	Atoms are ionized at high temperature
B	Nuclei break up at high temperature
C	Kinetic energy is high enough to overcome repulsion at high temperature
D	molecules break up at high temperature

Question 124

When an α-particle collides with an atom of a gas, it knocks out

A	Electrons
B	Protons
C	Positrons
D	Neutrons

Question 125

Radiation detectors are used to

A	detect different types of radiation
B	all of these
C	measure energy of radiation
D	measure range or penetration power of ionizing particles

Question 126

The number of protons or electrons in an atom is called

A	Charge number
B	None of these
C	Both of above
D	Atomic number

Question 127

Circulation of Blood can be studied by using Radioactive Isotope: (BWP 2015)

A	phosphorous-32
B	iodine-131
C	sodium-24
D	cobalt-60

Question 128

One-eighth of the initial mass of a certain radioactive isotope remain undecayed after one hour. Which of the following is the half life of isotope in minutes?

A	20 min
B	30 min
C	8 min
D	45 min

Question 129

The particles equal in mas or greater than protons are called: (MTN 2015 Group I)

A	Baryons
B	Hadrons
C	Fermions
D	Mesons

Question 130

In Wilson cloud chamber, track of &beta-particles is

A	all of these
B	Thin and discontinuous
C	Erratic
D	Frequent deflected

Question 131

β-particle is regarded as fast moving

A	electrons
B	protons
C	positrons
D	neutrons

Question 132

Which of the following is the percentage of the original quantity of a radioactive material left after fie half-lives approximately

A	3%
B	5%
C	10%
D	20%

Question 133

When a nucleus emits an alpha particles. Its atomic mass decreases by:

A	3
B	4
C	2
D	1

Question 134

In beta-decay, which one of the following reactions take place

A	¹₁H → ⁴₀n + ^°ree;₁e
B	⁴₀n → ¹₁H + ^°ree;₁e
C	⁴₀n → ²₁H + ^°ree;₁e
D	⁴₀n → ¹₁H + ^°ree;₁e

Question 135

Charged particles α or β and γ radiation produce fluorescenece in

A	Zinc sulphide
B	barium platinocynaide
C	all of these
D	sodium iodide

Question 136

The chemical properties of all the isotopes of an element are

A	Different
B	Slightly different
C	Same
D	None of these

Question 137

The moderators used in faster reactor is:

A	water
B	no moderator
C	graphite
D	sodium

Question 138

The time required for a radioactive material to decrease in activity by one half is called

A	Half time
B	Mean life
C	Half life
D	Disintegration time

Question 139

Gamma rays from cobalt-60 are used for the treatment of: (RWP 2015)

A	Cancer
B	Circulation of blood
C	Heart attack
D	Thyroid glands

Question 140

What was the fissionable material used in the atomic bomb droped at Nagasaki(Japan) in the year 1945?

A	Uranium
B	Plutonium
C	Thorium
D	Neptunium

Question 141

The charge on an Alpha particle is equal to: (BWP 2015)

A	-2e
B	#NAME?
C	#NAME?
D	2e

Question 142

The binding energy per neucleon is maximum for: (RWP 2015)

A	Iron
B	Radium
C	Polonium
D	Helium

Question 143

Artificial radiaoactivity was discovered by

A	None of these
B	Maxwell
C	Becquerel
D	Curie

Question 144

In fusion reaction, when two deutrons are merged to form helium nucleus, the energy released is

A	200 MeV
B	24 MeV
C	20 MeV
D	100 MeV

Question 145

Wilson cloud chamber is based on the principle that supersaturated vapors condense more readily on

A	Tons and dust particles
B	Ions only
C	Neither dust particles nor ions
D	Dust particles only

Question 146

The number of basic forces present in nature are

A	7
B	1
C	9
D	5

Question 147

By placing Wilson cloud chamber is strong magnetic field we can get information about_________of incident particle

A	Mass
B	Energy
C	all of these
D	Charge

Question 148

PWR stands for

A	Power wind reactor
B	Pressurize water reactor
C	Pressurize wind reactor
D	None of these

Question 149

Binding energy for deuteron nucleus is given by: (LHR 2015 Group I)

A	2.28 MeV
B	2.25 MeV
C	2.23 MeV
D	2.8 MeV

Question 150

Gamma rays carries a charge

A	#NAME?
B	#NAME?
C	no charge
D	-2e

Question 151

Beta(β)particles are:

A	Protons
B	Photons
C	All of these
D	Electrons

Question 152

The elements showing radiactivity have atomic number Z

A	Z < 82
B	Z < 70
C	Z > 50
D	Z > 82

Question 153

photoelectric effect take place when energy of γ-rays:

A	none of these
B	equal to 0.5 MeV
C	less than 0.5 MeV
D	greater than 0.5 MeV

Question 154

Gamma(γ) rays consists of stream of

A	protons
B	electrons
C	all of these
D	photons

Question 155

Fundamental forces of nature are

A	Electromagnetic force and weak nuclear force
B	Strong nuclear force
C	Weak nuclear force
D	All of these

Question 156

A Wilson cloud chamber uses

A	Super heated liquid
B	Supersaturated vapours
C	Vapours
D	Saturated vapours

Question 157

Geiger Muller counter is not used for

A	Fast Counting
B	Slow counting
C	Both slow and fast counting
D	None of these

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