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Nuclear Physics TNPSC Group 2 TNPSC Group 2A TNPSC Group 4 VAO Study Material

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NUCLEAR PHYSICS

 

 
Things around us are made up of ____
 
In 1803, ___ considered that elements consist of atoms
 
____ discovered cathode rays, known as electrons
 
_____ discovered positive rays 
Positive rays were named as protons by___ 
 
In 1932, James Chadwick discovered the chargeless particles called____
 
 In 1911, the British scientist, Ernest Rutherfordexplained that the mass of an atom is concentrated in its central part called ____
 
____ and her husband ____detected radioactivity in ‘Pitchblende’, a tiny black substance.
 
The elements whose atomic number is more than ___ undergo spontaneous radioactivity. Eg: uranium, radium, etc.
 
There are only two elements, which have been identified as radioactive substances with atomic number less than 82. They are ____
 
Technetium (Tc) atomic number is___
 
Promethium (Pm) atomic number is___
 
There have been ___ radioactive substances discovered so far. 
 
The phenomenon by which even light elements are made radioactive, by artificial or induced methods, is called____ 
 
____ is  exhibited by elements with atomic number more than 83.
 
___& is exhibited by elements with atomic number less than 83.
 
The SI unit of radioactivity is 
 
____, named after the planet Uranus, was discovered by Martin Klaproth
 
 
A nuclear reaction in which an unstable parent nucleus emits an alpha particle and forms a stable daughter nucleus, is called____.
 
 
A nuclear reaction, in which an unstable parent nucleus emits a beta particle and forms a stable daughter nucleus, is called____
 
The process of breaking (splitting) up of a heavier nucleus into two smaller nuclei with the release of a large amount of energy and a few neutrons is called___
 
The average energy released in each fission process is about____
 
A fissionable material is a radioactive element, which undergoes fission in a sustained manner when it absorbs a neutron. 
It is also termed as____
 
All isotopes of uranium do not undergo nuclear fission when they absorb a____ 
 
 
There are some radioactive elements, which can be converted into fissionable material. They are called as_____
 
A ____ is a self�propagating process in which the number of neutrons goes on multiplying rapidly almost in a geometrical progression
 
In the ____ chain reaction the number of neutrons released is maintained to be one
 
The minimum mass of a fissile material necessary to sustain the chain reaction is called ______
 
 
If the mass of the fissile material is less than the critical mass, it is termed as___ 

If the mass of the fissile material is more than the critical mass, it is termed as___ 
 
The atom bomb is based on the principle of ___ chain reaction. 
 
_____ is the unit used in nuclear physics to measure the energy of small particles.
 
The energy released in a nuclear fission process is about ____
 
The process in which two lighter nuclei combine to form a heavier nucleus is termed ___as ___
 
 
The relation between mass and energy proposed by Einstein is ____
 
 
The nuclear bomb that was dropped in Hiroshima during World War II was called as ___
 
The bomb, which was subsequently dropped over Nagasaki was called as____
 
The stars like our Sun emit a large amount of energy in the form of light and heat. This energy is termed as the____
 
Hydrogen bomb is based on the principle of _____
 
The energy released in a hydrogen bomb (or fusion bomb) is much higher than that released in an ____
 
The radio isotope of ____helps to increase the productivity of crops. 
 
____ are used as tracers to diagnose the nature of circulatory disorders of blood, defects of bone metabolism, to locate tumors, etc

____ (Na24) is used for the effective functioning of heart. 
 
 
____ is used to cure goiter. 
 
______ is used to diagnose anaemia and also to provide treatment for the same.
 
____ is used in the treatment of skin diseases. 
 
Radio cobalt (Co60) and radio-gold (Au198) are used in the treatment of___ skin 
 
____ are used to sterilize the surgical devices as they can kill the germs and microbes. 
In industries, ___are used as tracers to detect any manufacturing defects such as cracks and leaks.
 
An isotope of ____is used in the airlines to detect the explosives in the luggage. 
 
An isotope of ____ is used in many industries as a smoke detector. 
 
Using the technique of ____, the age of the Earth, fossils, old paintings and monuments can be determined. 
 
Safe limit of overall exposure to radiation is given as ___ milli sievert per year
 
____ is a device used to detect the levels of exposure to an ionizing radiation.
 
 
A ____’ is a device in which the nuclear fission reaction takes place in a self-sustained and controlled manner to produce electricity
 
The first nuclear reactor was built in 1942 at ___
 
A ___” is used to slow down the high energy neutrons to provide slow neutrons
 
____ and heavy water are the commonly used moderators
 
___ are used to control the number of neutrons in order to have sustained chain reaction.
 
 A ____ is used to remove the heat produced in the reactor core, to produce steam. 
 
____ are widely used in power generation
 
Nuclear power is the ___ largest source of power in India. 
 
___ Atomic Power Station is India’s first nuclear power station.
 

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