Nuclear Physics

Alpha ( $α$ ) particles are helium (He) nucleus with a charge of:
1. e
2. 2e
3. 3e
4. 4e
When two light nuclei combine to form a heavier nucleus, the process is said to be:
1. Nuclear fission
2. Nuclear fussion
3. Nuclear power
4. Nuclear transmutation
Name a moderator.
1. Uranium
2. Cadmium
3. Graphite
4. All of these
In the nuclide defined by ${}_{7}X^{15}$ , the number of protons and neutrons respectively are:
1. 7 and 8
2. 15 and 7
3. 8 and 6
4. 23 and 15
The elements which emit natural radioactivity are known as:
1. Radio elements
2. Active elements
3. Radioactive elements
4. Nuclear elements
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
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
Radiations present in atmosphere due to different substances are called:
1. Environmental radiations
2. Background radiations
3. Positive radiations
4. Cosmic radiations
Gamma ( $γ$ ) radiation are fast moving:
1. Electrons
2. Protons
3. Photons
4. Neutrons
In air, alpha particles have range of:
1. Few centimeters
2. Several thousand metres
3. Several hundred metres
4. Several metres
Isotpoes have same number of protons but different number of:
1. Electrons
2. Neutrons
3. Shells
4. Positrons
The number of protons inside nucleus represents:
1. Atomic mass
2. Atomic number
3. Atomic count
4. Radioactivity level
How much is the crictical mass of uranium fuel?
1. 0.10 kg
2. 1 kg
3. 100 kg
4. 10 kg
The phenomenon by which radiations split matter into negative and positive ions is called:
1. Ionization
2. Radiation
3. Transmutation
4. Radioactivity
Beta particles are stream of high energy:
1. Electrons
2. Protons
3. Photons
4. Positrons
Nuclei with atomic number 1 to 82 are:
1. Stable
2. Unstable
3. Moderately stable
4. Radioactive
During natural radioactivity the unstable nucleus disintegrates to become more:
1. Stable
2. Unstable
3. Excited
4. Unexcited
The elements whose atomic number is greater than 82 are naturally:
1. Unstable nuclei
2. Stable nuclei
3. Positive nuclei
4. Negative nuclei
Write the SI unit for the activity of the radioactive nuclide:
1. Curie
2. Becquerel
3. Rutherford
4. None of these
The positive charge in an atom is concentrated in a small region called:
1. Atomic mass
2. Electron
3. Proton
4. Nucleus
Name the absorbing material used to control the reaction rate of neutrons in a nuclear reactor.
1. Cadmium
2. Uranium
3. Radium
4. Polonium
Which of them are atomic models?
i. Thomson’s plum puddling model
ii. Rutherford’s nuclear model
iii. Bohr’s model
iv. Sommerfeld’s model
1. i and ii
2. i, ii and iii
3. ii, iii and iv
4. All of these
Proton has the charge:
1. 1637 times of an electron
2. 1737 times of an electron
3. 1837 times of an electron
4. 1937 times of an electron
Neutrons has the charge:
1. 1839 times of an electron
2. 1739 times of an electron
3. 1639 times of an electron
4. 1939 times of an electron
As per modern theory, the atom has a diameter of about:
1. $10^{- 4} m m$
2. $10^{- 5} m m$
3. $10^{- 6} m m$
4. $10^{- 7} m m$
In neutral atom, the electrons are bound to the nucleus by:
1. Magnetic force
2. Electrostatic force
3. Frictional force
4. Centripetal force
Name the scientist who discovered radioactivity?
1. Dr. Homi Jahangir Bhaba
2. Issac Newton
3. Henry Becquerel
4. None of these
Name the two radioactive elements discovered by Curie couple.
1. Radium and polonium
2. Radium and uranium
3. Uranium and polonium
4. None of these
Name the phenomenon by which energy is produced in stars.
1. Nuclear fusion
2. Nuclear fission
3. Radioactivity
4. Chain reaction
What are used to start, stop or adjust a nuclear fission?
1. Coolant
2. Control rods
3. Moderator
4. Nuclear fuel

Nuclear Physics

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