During the second half-life, the original material is decayed
1.one quarter
2.two quarter
3. three quarter
4.all of above
In fission, the mass of products is
1.less than original nucleus
2.more than original nucleus
3.equal to original nucleus
4.all of above
The phenomenon in which radiations split matter into ions is called
1. denaturing
2. ionization
3.condensation
4.atomization
The radiation emitted from the splits into
1.2 components
2.4 components
3.5 components
4. 3 components
The temperature at the center of the Sun is nearly
1.20 million Kelvin
2.10 million Kelvin
3.30 million Kelvin
4.25 million Kelvin
A compound containing some amount of radioisotope is
1.tracer
2. radioactive compound
3.non radioactive
4.linear active compound
A helium nucleus comprising of two protons and two neutrons with a charge of 2e is
1.beta particle
2.gamma particle
3.alpha particle
4.negative particle
A process in which heavy nucleus splits into two by bombarding a slow-moving neutron is called
1.radioactivity
2. nuclear fusion
3. nuclear fission
4.nuclear splitting
A stream of high energy electrons is the
1.alpha radiation
2. gamma radiation
3. beta radiations
4.no radiations
Alpha (α) particles are helium (He) nucleus with a charge of
1.e
2.2e
3.3e
4.4e
As compared to electron, a proton is about
1. 1936 times lighter
2. 1836 times lighter
3.1936 times heavier
4.1836 times heavier
Ashes from a fire in the forest show carbon-14 activity of only 1/8 the activity of fresh wood. How long ago the forest had fire?
1.18590 years
2.17190 years
3.16580 years
4.14820 years
Beta particles are stream of high energy
1.electrons
2.protons
3.photons
4.positrons
C-14: C-12 ratio in a fossil bone is found to be 1/4th that of the ratio in the bone of an animal. The half-life of C-14 is 5730 years, the approximate age of the fossil is
1.12460 years
2.11460 years
3.13590 years
4.14580 years
Cosmic radiations interact with atoms atmosphere to create
1.primary radiation
2. secondary radiation
3. tertiary radiation
4.no radiation at all
During natural radioactivity the unstable nucleus disintegrates to become more
1.stable
2.unstable
3.excited
4.unexcited
For curing cancerous tumors and cells, doctors use
1.radioactive cobalt-60
2.radioactive cobalt-80
3.radioactive cobalt-90
4.radioactive cobalt-50
For curing cancerous tumors and cells, doctors use
1.radioactive cobalt-60
2.radioactive cobalt-80
3.radioactive cobalt-90
4.radioactive cobalt-50
Gamma (γ) radiation are fast moving
1.electrons
2.protons
3.photons
4.neutrons
If a radioactive element has a half-life of 40 minutes. The initial count rate was 1000 per minute, then how long will it take for the count rate to drop to 125 per minutes
1.120 minutes
2.90 minutes
3.30 minutes
4.60 minutes
If the activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then the sample's half-life will be
1.3 days
2.10 days
3.5 days
4.7 days
In air, alpha particles have range of
1.few centimeters
2.several thousand meters
3. several hundred meters
4.several meters
In alpha decay (α-decay) the proton number of the parent nuclide
1.increases by 2
2. increases by 1
3.decreases by 2
4.decreases by 4
In each fission event, the energy released is about
1. 100 MeV
2.300 MeV
3.400 MeV
4.200 MeV
In nuclear fission, as compared to the original mass of the heavy nucleus, the total mass of the product is
1.equal
2.more
3.less
4.zero
In nuclear fusion, as compared to the masses of original nuclei, the final nucleus is always
1. equal
2.more
3.less
4.zero
In SI base units, 1 Bq is equal to
1.10 disintegration per second
2.1.5 disintegration per second
3.0.01 disintegration per second
4.1 disintegration per second
In the air, the beta particle has a range of
1.few centimeters
2.several thousand meters
3.several hundred meters
4.several meters
In the atmosphere, a small amount is present of radioactive
1. carbon-15
2.carbon-19
3.carbon-10
4.carbon-14
In the nuclide defined by &15&7X, the number of protons and neutrons respectively are
1.7 and 8
2.15 and 7
3.8 and 6
4.23 and 15
Isotopes have same number of protons but different number of
1.electrons
2. neutrons
3.shells
4.positrons
Most of the nuclei with atomic number 1 to 82 are
1.positive nuclei
2. negative nuclei
3.unstable nuclei
4.stable nuclei
Nuclei bombarded with protons, neutron or alpha particles are changed to
1.isotopes
2.radioisotopes
3.element having atomic number less than 82
4.none of above
Nuclei which do not emit radiations naturally are called
1.unstable nuclei
2.stable nuclei
3.positive nuclei
4.negative nuclei
Nuclei with atomic number 1 to 82 are
1.stable
2. unstable
3. moderately
4.stable radioactive
Nucleons are a collection of
1.electrons and protons
2.electrons and neutrons
3. protons and neutrons
4.protons and positrons
Per year safe limit of radiation exposure is
1. 5 rem
2.10 rem
3.7 rem
4.15 rem
Radiation that causes redness and sores on the skin is
1.gamma only
2. beta only
3.alpha
4.gamma and beta
Radiations burn mainly due to
1.alpha radiations
2.beta radiations
3.gamma radiations
4.beta and gamma radiations
Radiations present in atmosphere due to different radioactive substances are called
1.environmental radiations
2. background radiations
3.positive radiations
4.cosmic radiations
Radioisotope for treating cancer tumors and cells is
1.Phosphorous-32
2.carbon-14
3.cobalt-60
4.cobalt-59
Radium-226 has a half-life of
1.1160 years
2.1340 years
3.1580 years
4.1620 years
Technimum-99 has a half-life of 6 hours. If there is 300 mg of it, how much will be left in 48 hours?
1.1.58 mg
2. 1.25 mg
3.1.17 mg
4.2.56 mg
The activity of 1 g of radium is
1. 3.73 * 104MBq
2. 2.76 MBq
3.3.0 MBq
4.5.9 MBq
The activity of 1 gram of radium is
1.3.73 × 104 MBq
2.4.58 × 104 MBq
3.1.69 × 104 MBq
4. 2.56 × 104 MBq
The activity of a sample of radioactive bismuth decreases to one-eighth of the original in 15 days. Its half-life is
1. 10 days
2.15 days
3.3 days
4. 5 days
The age of fossil when C-14: C-12 in bone is one fourth of ratio in bone of living animal and half-life of C-14 is 5732 years is
1.100 years
2.11460 years
3.1000 years
4.1200 years
The artificially produced radioactive elements are known as
1.ions
2.radiant
3.radioisotopes
4.transmutations
The atoms of an element which have the same number of protons but different number of neutrons in their nuclei are known as
1. ions
2.isotopes
3.radiant
4.electrons
The chemical compounds to explore the metabolism of chemical reactions inside the human body, animals or plants containing some quantity of radioisotopes are called
1.radioactive endoscope
2.radioactive tracers
3.radioactive fusion
4.radioactive atoms
The cosmic radiation consists of
1.protons and electrons
2.alpha particles
3.larger nuclei
4.all of above
The elements which emit natural radioactivity are known as
1.radio elements
2.active elements
3.radioactive elements
4.nuclear elements
The elements whose atomic number is greater than 82 are naturally
1.unstable nuclei
2. stable nuclei
3. positive nuclei
4. negative nuclei
The fast-moving light photons are
1.alpha radiation
2.gamma radiation
3.beta radiations
4.no radiations
The greatest ionization power is possessed by beta particles gamma particles neutrons
1.beta particles
2.gamma particles
3. neutrons
4.alpha particles
The greatest penetration power is of which one?
1.Gamma rays
2.alpha rays
3. beta rays
4.neutrons
The greatest power of ionization is in
1.alpha particles
2.gamma particles
3.beta particles
4.none of above
The half-life of &15&3N is 6.5 s. A sample of this nuclide of hydrogen is observed for 32.5 s. The fraction of the original radioactive isotope remaining after this time is
1.1 â„ 32
2.1 â„ 16
3.1 â„ 8
4.1 â„ 4
The half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, then the time for which count rate reaches 46 counts per minute would be?
1.30 minutes
2.40 minutes
3.15 minutes
4.23 minutes
The half-life of Carbon-14 is
1.23 years
2.1000 years
3.1200 years
4.5730 years
The lifetime of unstable nuclei is
1.limited
2.unlimited
3.100 years
4.50 years
The mass of neutron and proton is
1. equal
2.unequal
3.zero
4.undetermined
The matter is built from small particles called
1.radiant
2.atoms
3.isotopes
4.ions
The nucleus contains protons and neutrons which are collectively termed as
1.nucleons
2.protons
3.atoms
4.electrons
The nucleus contains protons and neutrons which are collectively termed as
1.nucleons
2.protons
3.atoms
4.electrons
The number of neutrons in the nucleus is called neutron number (N) atomic number (Z) atomic mass number (A) electron number (E)
1.neutron number (N)
2.atomic number (Z)
3.atomic mass number (A)
4.electron number (E)
The number of protons and neutrons in the nucleus is called
1. neutron number (N)
2.atomic number (Z)
3.atomic mass number (A)
4.electron number (E)
The number of protons in the nucleus is called
1.neutron number (N)
2.atomic mass number (A)
3. electron number (E)
4.atomic number (Z)
The number of protons inside nucleus represents
1.atomic mass
2.atomic number
3.atomic count
4.radioactivity level
The phenomenon by which radiations split matter into negative and positive ions is called
1.ionization
2.radiation
3. transmutation
4. radioactivity
The positive charge in an atom was concentrated in
1.nucleus
2.shells
3.outside shells
4. between shells
The positive charge in an atom was concentrated in a small region called
1.atomic mass
2.electron
3.proton
4.nucleus
The radiation emitted from uranium salt can
1.DE stable the electrons
2.break the protons
3.make the protons
4. ionize the gas
The radiation emitted from uranium salt can
1.DE stable the electrons
2.break the protons
3.make the protons
4. ionize the gas
The radiation that does not change its direction inside the magnetic field is
1. alpha
2.beta
3.gamma
4.x-ray
The radiation which does not change its direction is
1.β radiation
2.α radiation
3.γ radiation
4.no radiation
The radiation which primarily consists of protons, electrons, alpha particles, and large nuclei are called
1.environmental radiations
2.background radiations
3.positive radiations
4.cosmic radiations
The radiation which strongly interacts with the matter due to its charge and has a short-range as compared to gamma radiations is
1.alpha radiation
2.beta radiation
3.no radiation
4.gamma radiation
The radiations bend in the opposite direction in the magnetic field are α and β radiations
1.α and β radiations
2.α and γ radiations
3.γ and β radiations
4.All the above
The radiations emitted by different elements are
1.alpha
2.beta
3.gamma
4.All the above
The radiations that can ionize the matter are
1.alpha radiations
2. gamma radiations
3.beta radiations
4.all of above
The rate of radioactive decay is proportional to
1.nature of rays
2.no. of electron
3. no. of protons
4. no. of unstable nuclei
The rate of radioactive decay is proportional to the number of
1.unstable nuclei
2.unstable protons
3.unstable electrons
4.unstable atoms
The release of energy from the sun is due to
1. nuclear fission
2.nuclear fusion
3. burning of gases
4.chemical reaction
The safe level of radiation exposure per year is
1.1.0 rem
2.2.0 rem
3.5.0 rem
4.4.0 rem
The SI unit for radioactivity is
1. farad
2.Pascal
3.Becquerel
4. ammeter
The simplest atom with a single proton is of
1.nitrogen
2.helium
3.carbon
4.hydrogen
The spontaneous emission of radiation by unstable nuclei is called
1.positive radioactivity
2.artificial radioactivity
3.natural radioactivity
4.negative radioactivity
The spontaneous process in which a parent unstable nuclide changes into a more stable daughter nuclide with the emission of radiations is called
1.nuclear radioactivity
2. nuclear transmutations
3.nuclear radioisotopes
4.nuclear ionization
The strength of radiations to penetrate a certain material is known as
1.splitting power
2.ionization power
3.penetrating power
4. radiation power
The strength of radiations to penetrate a certain material is known as
1.splitting power
2.ionization power
3.penetrating power
4. radiation power
The time during which half of the unstable radioactive nuclei disintegrate of the sample of a radioactive element is called the
1.full life
2.half life
3.double life
4.quarter life
The types of radiations emitted by the radioactive substance are
1.2
2.4
3.5
4.3
Times a proton is heavier than an electron is
1.1827
2.1876
3.1836
4.1789
To create a shower of secondary radiation, the cosmic radiation interacts with
1.atoms
2.electrons
3.protons
4.neutrons
What fraction of the original sample will be after 22 years, if the Cobalt-50 is a radioactive element with a half-life of 4.3 years?
1.1 â„ 32
2. 1 â„ 16
3.1 â„ 8
4.1 â„ 4
When a heavy nucleus such as U-235 splits or fissions into two smaller nuclei by absorbing a small moving neutron, there takes place a
1.nuclear fission
2.nuclear power
3. nuclear transmutation
4.nuclear fusion
When alpha and beta particles are slowed down by collisions, they become
1.harmful
2.harmless
3.useful
4.expensive
When two light nuclei combine to form a heavier nucleus, the process is said to be
1.nuclear fission
2.nuclear fusion
3.nuclear power
4.nuclear transmutation
When two light nuclei combine to form a heavier nucleus, the process is said to be
1.nuclear fission
2.nuclear fusion
3.nuclear power
4.nuclear transmutation