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

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

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

Question 2

In a nuclear reactor, cadmium rods are used to

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

Question 3

The number of protons or electrons in an atom is called

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

Question 4

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

A	5
B	2
C	3
D	6

Question 5

Geiger Muller counter is not used for

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

Question 6

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

Question 7

Which of the following is the pair of isobars

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

Question 8

PWR stands for

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

Question 9

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

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

Question 10

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	30 days
C	20 days
D	12 days

Question 11

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

A	Baryons
B	Hadrons
C	Mesons
D	Fermions

Question 12

The chemical properties of all the isotopes of an element are

A	None of these
B	Different
C	Same
D	Slightly different

Question 13

Beta(β)particles are:

A	Electrons
B	Protons
C	All of these
D	Photons

Question 14

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

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

Question 15

The number o neutrons in the nucleus of ²³⁵₉₂U are

A	None of these
B	92
C	143
D	235

Question 16

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

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

Question 17

Curie is a unit of

A	Conductivity
B	Radioactivity
C	Binding energy
D	Resistivity

Question 18

In heavier elements

A	N > Z
B	N < Z
C	N ≤ Z
D	C < Z

Question 19

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

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

Question 20

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

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

Question 21

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

A	Protium
B	Tritium
C	Deuterium
D	Deutron

Question 22

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

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

Question 23

Average number of neutrons produced in each fssion reaction are

A	3
B	6
C	5
D	4

Question 24

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

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

Question 25

β-particles carries a charge

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

Question 26

Various types of cancer are treated by

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

Question 27

Which of the following is a good nuclear fuel?

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

Question 28

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	All of the above
D	Gravitational and nuclear

Question 29

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

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

Question 30

Subatomic particles are divided into:

A	Photons
B	Leptons
C	All of these
D	Hardens

Question 31

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

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

Question 32

During fission process, the energy release per nucleon is about

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

Question 33

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

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

Question 34

The uncontrolled fission chain reaction results into the formation is

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

Question 35

α - particle carries a change: (GRW 2015)

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

Question 36

Dr. Abdul Salam was awarded noble prize in

A	1969
B	1985
C	1979
D	1989

Question 37

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

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

Question 38

The source of solar energy is mainly due to

A	Pair production
B	All of these
C	Fission
D	Fusion

Question 39

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

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

Question 40

Weak nuclear force is

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

Question 41

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	8 min
B	45 min
C	20 min
D	30 min

Question 42

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

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

Question 43

Xenon has 36 isotopes while cesium has ___________ isotopes

A	36
B	None of these
C	24
D	12

Question 44

1u (unified mass scale) is equivalent to

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

Question 45

In alpha decay

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

Question 46

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	234,90
D	234,88

Question 47

The number isotopes of hydrogen are

A	3
B	4
C	2
D	1

Question 48

Artificial radiaoactivity was discovered by

A	Becquerel
B	Curie
C	None of these
D	Maxwell

Question 49

The number of basic forces present in nature are

A	9
B	5
C	7
D	1

Question 50

Electrons are: (MTN 2015 Group II)

A	Leptons
B	Baryons
C	Quarks
D	Hardons

Question 51

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 52

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

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

Question 53

A Wilson cloud chamber uses

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

Question 54

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

A	fusion reaction
B	fission reaction
C	reactor
D	radiation detector

Question 55

The ionization power of β particles

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

Question 56

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

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

Question 57

The number of Quarks are (SGD 2015 Group II)

A	2
B	4
C	8
D	6

Question 58

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

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

Question 59

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

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

Question 60

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

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

Question 61

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

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

Question 62

Radioactivity happens due to the disintegration of

A	Nucleus
B	Protons
C	Electrons
D	Neutron

Question 63

The rate of decay of radioactive substance

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

Question 64

Which one of the following is a radiation detector?

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

Question 65

In fission reaction, heavy water is used as a

A	coolant
B	all of these
C	moderator
D	heat exchanger

Question 66

Track of γ-rays is

A	Straight
B	Irregualr
C	Thick
D	Continuous

Question 67

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

A	None of above
B	Increases
C	decreases
D	remains same

Question 68

One gray(Gy) is equal to

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

Question 69

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

A	Straight
B	Thick
C	all of these
D	Continuous

Question 70

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

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

Question 71

After present unification, the number of fundamental forces are

A	2
B	3
C	5
D	4

Question 72

The moderators used in faster reactor is:

A	no moderator
B	sodium
C	graphite
D	water

Question 73

Radiation detectors are used to

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

Question 74

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

A	Ordinary water
B	Aluminium
C	Lead
D	Heavy water

Question 75

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

A	²₁H
B	¹_-1e
C	¹₀n
D	¹₁H

Question 76

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

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

Question 77

Hydrogen bomb is an example of

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

Question 78

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

A	Protium
B	Deuterium
C	Tritium
D	Deuteron

Question 79

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

A	U²³³
B	U²³⁸
C	U²³⁹
D	U²³⁵

Question 80

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

A	Plutonium
B	Uranium
C	Thorium
D	Neptunium

Question 81

The unit of radioactivity "curie" is equal to

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

Question 82

Subatomic particles are divided into:

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

Question 83

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

A	5-Feb
B	(5)²
C	(2)⁵
D	(2)^-5

Question 84

Cloud chamber was invented by

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

Question 85

The particles equal in mass or greater than protons are called

A	Baryons
B	Mesons
C	Leptons
D	Quarks

Question 86

The average life of the radioactive substance is

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

Question 87

photoelectric effect take place when energy of γ-rays:

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

Question 88

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	3.85 x 10⁹ years
D	4.11 x 10⁹ years

Question 89

Fundamental forces of nature are

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

Question 90

The constituents of nucleus are held together b

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

Question 91

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

A	Proton
B	Electron
C	Meson
D	Neutron

Question 92

Electromagnetic force is

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

Question 93

Nucleus consists of

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

Question 94

Isotopes of the nucleus of uranium are:

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

Question 95

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

A	Neutrons
B	Mesons
C	Protons
D	Muons

Question 96

Electromagnetic and weak forces were unified by

A	All of these
B	Glashow
C	Abdul Salam
D	Weinberg

Question 97

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

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

Question 98

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

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

Question 99

γ - rays are electromagnetic waves like

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

Question 100

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

A	1
B	2
C	3
D	4

Question 101

Structure of the nucleus was explained by

A	Bohr
B	Thomson
C	Rutherford
D	Milikan

Question 102

The most stable element is

A	Cobalt
B	Iron
C	Uranium
D	Copper

Question 103

Gamma(γ) rays consists of stream of

A	protons
B	all of these
C	photons
D	electrons

Question 104

The binding energy per nucleus for uranium is about

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

Question 105

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

A	Cadmium
B	Graphite
C	Sodium
D	Uranium

Question 106

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 107

Charged particles α or β and γ radiation produce fluorescenece in

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

Question 108

Ultra violet rays can cause

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

Question 109

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

A	Positrons
B	Neutrons
C	Electrons
D	Protons

Question 110

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

A	Iron
B	Helium
C	Polonium
D	Radium

Question 111

The number of neutrons in any nucleus can be given by

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

Question 112

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

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

Question 113

The half life of a radioactive element is given by:

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

Question 114

Nuclei having same charge number but different mass number are called

A	Isomers
B	Isotones
C	Isobars
D	Isotopes

Question 115

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

A	3
B	1
C	4
D	2

Question 116

β-particle is regarded as fast moving

A	electrons
B	protons
C	positrons
D	neutrons

Question 117

Electric and magnetic forces were unified by:

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

Question 118

Nuclei of different elements are identified by their

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

Question 119

Fusion reaction takes place at high temperature because

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

Question 120

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

A	Photon
B	Meson
C	Lepton
D	Positrons

Question 121

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

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

Question 122

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

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

Question 123

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

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

Question 124

An old unit, the rem is equal to

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

Question 125

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

A	Electrons
B	Photons
C	Neutrons
D	Positrons

Question 126

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

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

Question 127

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

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

Question 128

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

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

Question 129

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

A	Protium
B	Deuterium
C	None of these
D	Tritium

Question 130

Gamma rays carries a charge

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

Question 131

The LMFBR(fast reactor) reactr utilizes

A	²³⁹₉₂U
B	²³⁵₉₂U
C	²³⁴₉₂U
D	²³⁸₉₂U

Question 132

Total charge on any nucleus is

A	Ne
B	Z/e
C	Ae
D	Ze

Question 133

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 134

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

A	Positrons
B	Ions
C	Quarks
D	Electrons

Question 135

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

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

Question 136

The elements showing radiactivity have atomic number Z

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

Question 137

For the treatment of skin diseases

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

Question 138

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

A	Hardon
B	Lepton
C	Baryon
D	Meson

Question 139

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

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

Question 140

The ionization power of α-particles is

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

Question 141

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

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

Question 142

1u = _____________

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

Question 143

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

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

Question 144

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

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

Question 145

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

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

Question 146

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

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

Question 147

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

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

Question 148

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

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

Question 149

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

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

Question 150

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

A	electron
B	Alpha particle
C	Neutron
D	Proton

Question 151

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

A	Mass
B	all of these
C	Energy
D	Charge

Question 152

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

A	4
B	3
C	2
D	1

Question 153

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

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

Question 154

Alpha(α) particles are

A	Hydrogen nuclei
B	Electrons
C	Helium nuclei
D	Photons

Question 155

The isotope ¹₁H contain

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

Question 156

The partilces lighter than protons are called

A	Quarks
B	Leptons
C	Baryons
D	Mesons

Question 157

The relation between rad and Gy is

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

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