Physics XII Chapter 21 MCQs
Which of the following is high energy
a)gamma rays
b)x rays
c)both have same energy
d)none
During nuclear changes laws of conservation of ___ is/are applicable
During nuclear changes laws of conservation of ___ is/are applicable
a)mass
b)charge
c)energy
d)all
When beta particles is emitted then which of the following does not change
When beta particles is emitted then which of the following does not change
a)charge number
b)atomic number
c)mass number
d)all
Geiger c0unter can be used to determine?
Geiger c0unter can be used to determine?
Range
Penetrati0n p0wer
B0th a,b
N0ne
mass of helium is?
mass of helium is?
2e
4kg
2kg
4U
The interaction with matter depends on
The interaction with matter depends on
a The mass of the particle
b Energy of the particle
c Charge of the above
d All of the above
A radioactive substance has a half life of 60 minutes. During 3 hours the fraction of atom that have decayed would be:
A radioactive substance has a half life of 60 minutes. During 3 hours the fraction of atom that have decayed would be:
a 12.5%
b 87.5%
c 85%
d 25.1%
A chain reaction is continuous due to:
A chain reaction is continuous due to:
a Large mass defect
b Large energy
c Production of more neutrons in fission
d None of these
Which one of the following detectors can count fast and operate at low voltage
Which one of the following detectors can count fast and operate at low voltage
a Geiger counter
b Wilson could chamber
c Solid state detector
d Scintillation counter
The process of making the gas non-conducting immediately after the passage of ionizing particle through the tube is called:
The process of making the gas non-conducting immediately after the passage of ionizing particle through the tube is called:
a Gaseous discharged
b De-Excitation of discharge
c Quenching of discharge
d Excitation of discharge
The chemical behavior of an atom is determined by:
The chemical behavior of an atom is determined by:
a Binding energy
b Atomic number
c Mass number
d Number of isotopes
Beta-particle ionizes an atom:
Beta-particle ionizes an atom:
a Due to direct collision
b Due to electromagnetic force
c Due to gravitational force
d Due to electrostatic force of repulsion
Mass spectrograph sorts out
Mass spectrograph sorts out
a)molecules
b)atoms
c)elements
d)isotopes
Pair production can take place only with:
Pair production can take place only with:
a X-rays
b Heat radiations
c Gamma-rays
d Ultra violet rays
How much times, the a-particles more massive than an electron:
How much times, the a-particles more massive than an electron:
a 600
b 7000
c 5000
d 15000
The emission of radiations take place in elements, having charge number greater than:
The emission of radiations take place in elements, having charge number greater than:
a 109
b 82
c 69
d 52
For an atom having atomic number ‘Z’ and atomic weight ‘A’, the number of neutrons in the nucleus is:
For an atom having atomic number ‘Z’ and atomic weight ‘A’, the number of neutrons in the nucleus is:
a A—Z
b A
c Z
d A+Z
Which of the following is not an instrument for monitoring radiation?
Which of the following is not an instrument for monitoring radiation?
a Photographic film
b Mass spectrograph
c Giger Muller tulse
d Scintillation counter
Geiger counter is a device to detect:
Geiger counter is a device to detect:
a Mass
b Momentum
c Charge
d Radiation
Gamma rays are:
Gamma rays are:
a High energy photons
b Highly penetrating power
c Electro magnetic waves
d All of the above
The unit of decay constant is:
The unit of decay constant is:
a sec
b Sec²
c sec-¹
d sec-²
Fraction of the decaying atoms per unit time is called:
Fraction of the decaying atoms per unit time is called:
a Decay atom
b Decay element
c Decay constant
d Decay
An alpha-particle ionizes the atom:
An alpha-particle ionizes the atom:
a Through electrostatic repulsion
b Though electrostatic attraction
c Through direct collision
d Through gravitational attraction
I(31) used for the remedy of:
I(31) used for the remedy of:
a Skin cancer
b Thyroid disabilities
c Lungs cancer
d None
Curie is a unit of:
Curie is a unit of:
a Energy of gamma-rays
b Half-Life
c Radioactivity
d Intensity of gamma-rays
G.M. counter always uses:
G.M. counter always uses:
a Alcohol only
b Bromine
c Argon
d Neon and bromine
An alpha particle has a charge of:
An alpha particle has a charge of:
a +2e
b -2e
c +e
d -e
The half — life of a radioactive substance depends upon:
The half — life of a radioactive substance depends upon:
a Pressure
b Temperature
c Amount of substance
d No external influences
The nuclei having the same mass number but different atomic number are called:
The nuclei having the same mass number but different atomic number are called:
a Isotopes
b Isobars
c Isotones
d Isolets
Radioactive traces are also employed to follow the path that various chemicals or food constituents taken in:
Radioactive traces are also employed to follow the path that various chemicals or food constituents taken in:
a Plants
b Animals
c Human bodies
d All the above
The discoverer of radioactivity was:
The discoverer of radioactivity was:
a Henri Bacqueral
b Ernest & Rutherford
c Madame Curie
d J.J. Thomson
A particle having the mass of an electron and charge of a proton is called a ____
A particle having the mass of an electron and charge of a proton is called a ____
a)antiproton
b)positron
c)gamma rays
d)photon
When a charged particle passes through matter, it produces ionization this effect is used in:
When a charged particle passes through matter, it produces ionization this effect is used in:
a Fission reaction
b Reactor
c Radiation detector
d Fusion reaction
Cancerous tissues in a thyroid gland can be detected by the intake of:
Cancerous tissues in a thyroid gland can be detected by the intake of:
a Radio iodine
b Radio sodium
c Radio carbon
d Radio phosphorous
Binding energy of helium is given by:
Binding energy of helium is given by:
a 20 MeV
b 28.2 MeV
c 931 MeV
d 40 MeV
Thyroid cancer is cured by:
Thyroid cancer is cured by:
a Cesium — 137
b Sodium —24
c Iodine — 131
d Cobalt — 60
In fusion reaction, when two electrons are merged to form a helium nucleus, how much energy is released?
In fusion reaction, when two electrons are merged to form a helium nucleus, how much energy is released?
a 20 MeV
b 23 MeV
c 24 MeV
d 30 MeV
1rem=?
1rem=?
O.01Gy
0.01sv
0.01g
N0ne
Electric and magnetic forces were unified by:
Electric and magnetic forces were unified by:
a Faraday
b Maxwell
c Faraday and Maxwell
d None of these
Beta-particles produce fluorescence in:
Beta-particles produce fluorescence in:
a Calcium tungstate
b Zinc sulphide
c Barium platinum cyanide
d All of the above
With two down quarks and one up quark, which of the following can be made:
With two down quarks and one up quark, which of the following can be made:
a Electron
b Proton
c Photon
d Neutron
Wit two up quarks and one down quark, which of the following can be made:
Wit two up quarks and one down quark, which of the following can be made:
a Proton
b Neutron
c Electron
d Photon
Uranium bombs depends on the process of:
Uranium bombs depends on the process of:
a Fission
b Fusion
c Thermonuclear
d Annihilatio
An atom of an element differs from an atom of one of its isotopes in the number of:
An atom of an element differs from an atom of one of its isotopes in the number of:
a Neutrons in the nucleus
b Proton in the nucleus
c Electrons outside the nucleus
d Protons outside the nucleus
A device for actually observing the paths of alpha and beta particles is called a
A device for actually observing the paths of alpha and beta particles is called a
a Cyclotron
b Geiger counter
c Mass spectrograph
d Wilson’s Cloud Chamber
1Gy=?
1Gy=?
1Jkg-1
1Jmg-1
1Nmkg-1
B0th a,c
Which of the following possess max velocity
Which of the following possess max velocity
a)alpha rays
b)beta rays
c)gamma rays
d)all
The radioactive element has half life of 1600years, after 6400 years what amount will remain
The radioactive element has half life of 1600years, after 6400 years what amount will remain
a)1/16
b)1/8
c)1/2
d)1/4
After two half lives the no of decayed nuclei of an element are
After two half lives the no of decayed nuclei of an element are
a)N
b)N/2
c)N/4
d)3N/4
The most useful tracer is
The most useful tracer is
a)Sr-90
b)I-131
c)Ca-41
d)C-14
When alpha particles are bombarded on nitrogen then which of the following is produced
When alpha particles are bombarded on nitrogen then which of the following is produced
a)Boron
b)oxygen
c)hydrogen
d)both b and c
the vital part of a reactor is?
the vital part of a reactor is?
Product
Core
Ssd
N0ne
sl0w d0wn the speed of the neutr0ns pr0duced during fissi0n process and to direct them towards fuel is functi0n of?
sl0w d0wn the speed of the neutr0ns pr0duced during fissi0n process and to direct them towards fuel is functi0n of?
Reactors
Moderators
B0th
N0ne
In a controlled chain reacti0n,.....neutr0n,on average fr0m each fissi0n event causes an0ther nucleus to fissi0n.?
In a controlled chain reacti0n,.....neutr0n,on average fr0m each fissi0n event causes an0ther nucleus to fissi0n.?
1
2
3
4
Uranium was used as ..... In the elementary react0rs?
Uranium was used as ..... In the elementary react0rs?
Reactant
Product
Fuel
CNG
Uranium was used as ..... In the elementary react0rs?
Uranium was used as ..... In the elementary react0rs?
Reactant
Product
Fuel
CNG
GM counter cant detect
GM counter cant detect
a.alpha
b.beta
c.gamma
d.none
in solids intensity of gamma rays decreases ___ with increasng depth of penetration?
in solids intensity of gamma rays decreases ___ with increasng depth of penetration?
a)linearly
b)exponentially
c)equally
d)none
ozone becomes vital to life at ___ height
ozone becomes vital to life at ___ height
a)10-20 km
b)0-40 km
c)20-50 km
d)none
speed of gamma rays is equal to ?
speed of gamma rays is equal to ?
a)alpha rays
b)beta rays
c)electromagnetic rays
d)none
the following reaction can be reversed by:
the following reaction can be reversed by:
17O8 + 1H1 --------> 14N7+ 2He4
a. high energy proton
b. high velocity proton
c. high energy alpha particle
d. any one can
the mass density of a nucleus varies with mass no. A as
the mass density of a nucleus varies with mass no. A as
A. A2
B. A
C. Constant
D. 1/A
__ is used as quenching gas in GM COUNTER
__ is used as quenching gas in GM COUNTER
a)bromine
b)flourine
C)chlorine
d)all
the following reaction can be reversed by:
the following reaction can be reversed by:
14N7+ 2He-------->417O8 + 1H1
a. high energy proton
b. high velocity proton
c. high energy alpha particle
d. any one can
carbon 14 releases ___ radiations
carbon 14 releases ___ radiations
a)alpha
b)beta
c)gamma
d)none
cobalt is absorbed mostly by ?
cobalt is absorbed mostly by ?
a)bones
b)throid gland
c)liver
d)stomach
Half Life Of Iodine - 131 is _______ dayz :
Half Life Of Iodine - 131 is _______ dayz :
a) 7
B) 8
C) 9
D) 6
Actually The Basic Forces of Nature Are ________ In Number :
Actually The Basic Forces of Nature Are ________ In Number :
A) 1
B) 2
C) 3
D) 4
We know That Basic Forces Are :
We know That Basic Forces Are :
A) Gravitational
B) Magnetic
C) Electirc
D) Weak Nuclear
E) Strong Nuclear
F) ALL
the counter which also provides power is called
the counter which also provides power is called
a.GM counter
b.scaler
c.vector
d.wilson cloud chamber
at high energies ,the dominant process that removes photons from a beam is
at high energies ,the dominant process that removes photons from a beam is
a.photoelectric effect
b.pair production
c.compton effect
d.all
____ is not a long range force
____ is not a long range force
a)nuclear force
b)electromagnetic force
c)gravitational force
d)electric force e all are long range
_____ Leaves are also source of radiations :
_____ Leaves are also source of radiations :
A) Hemp
B) Mimosa
C) Tobacco
D) Cauriscaeta` Masaei
Binding Energy per nucleon increases up to A =
Binding Energy per nucleon increases up to A =
A) 40
B) 50
C) 48
D) 58
in radioactivity ,the rate of decay:
in radioactivity ,the rate of decay:
a.can be increased by magnetic field
b.can be increased by magnetic field
c.can be kept constant by electric field
d.is not effected by electric or magnetic field
the dead time in case of GM counter is
the dead time in case of GM counter is
a.10^-3
b.10^-4
c.10^-5
d.10^-2
1 Gy =___?
1 Gy =___?
a)joule /s
b)joule / kg
c)joule
d)kg
the fration of radioactvive sample decays after two half lives have elapsed
the fration of radioactvive sample decays after two half lives have elapsed
a.25%
b.50%
c.75%
d.100%
The substance which have less half life ---atoms will decay
The substance which have less half life ---atoms will decay
a.less
b.more
c.none
the ratio of fraction of decaying atoms per unit time is called
the ratio of fraction of decaying atoms per unit time is called
a.half life
b.radio active decay
c.decay constant
d.none of these
Ne(A=22,Z=10) Na(A=22,Z=11)
Ne(A=22,Z=10) Na(A=22,Z=11)
Are called as _____ ?
A) isotopes
B) isotones
C) isobars
D) Isographs
In heavier elements no. of _____ are greater than the no. of ____ in nucleus?
In heavier elements no. of _____ are greater than the no. of ____ in nucleus?
A) Protons,neutrons
B) Neutrons,protons
C) Both have same no.
D) Statement he nahi sahi
Among the following which is the Heaviest ?
Among the following which is the Heaviest ?
A) Proton
B) Neutron
C) Electron
D) Both A and B have same.
1 u mass is equal to ?
1 u mass is equal to ?
a)931 eV energy
b)931meV energy
c)931 GeV
d)931 keV
Half life of radioactive element is such that 7/8 of a quantity decays in 12days.
Half life of radioactive element is such that 7/8 of a quantity decays in 12days.
What fraction of it remains undecayed after 24
days.
a)0
b)1/128
c)1/64
d)1/16
radioactive wastes are of.......types?
radioactive wastes are of.......types?
2
3
1
4
As a sample of radioactive element decays its half life
As a sample of radioactive element decays its half life
a)decreases
b)increases
c)remains same
d)changes exceptionally
A deuteron is:
A deuteron is:
a A type of proton
b A proton ad neutron bound together
c A type of neutron
d None of these
The ionization energy of an atom as compared to the binding energy of its nucleus is:
The ionization energy of an atom as compared to the binding energy of its nucleus is:
a Greater
b Less
c The same
d None of the above
The range of 7.7 Mev alpha-particle in air is about:
The range of 7.7 Mev alpha-particle in air is about:
a 10cm
b 20cm
c 17cm
d 7cm
For producing one ion pair during ionization the energy used up is:
For producing one ion pair during ionization the energy used up is:
a 40 ev
b 70 ev
c 35 ev
Which particle has the greatest relative biological
Which particle has the greatest relative biological
a Neutrons
b Beta-particles
c Alfa-particles
d X-rays
A radioactive substance has half life of four months. Three fourth of the substance will decay in:
A radioactive substance has half life of four months. Three fourth of the substance will decay in:
a 3 months
b 4 months
c 12 months
d 8 months
During an encounter alpha particles knockss out ____
During an encounter alpha particles knockss out ____
a)protons
b)electrons
c)neutrons
d)nothing
At any instant the ratio of the amount of radioactive substance is 2: 1. If their hall lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances?
At any instant the ratio of the amount of radioactive substance is 2: 1. If their hall lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances?
a 1:1
b 2:1
c 1:2
d 1:4
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