CBSE Questions for Class 12 Medical Physics Nuclei Quiz 2 - MCQExams.com

Fusion reaction take place at high temperature because
  • atoms are ionized at high temperature
  • molecules break up at high temperatures
  • nuclei break up at high temperature
  • kinetic energy is high enough to overcome repulsion between nuclei
The velocity of a particle is $$60$$% of velocity of light. Then the percentage increase in its mass is
  • $$75$$%
  • $$40$$%
  • $$25$$%
  • $$60$$%
Nuclear fusion produces:
  • argon
  • deuterium
  • helium
  • krypton
Which of the following property of an element never changes?
  • Valency
  • Atomic weight
  • Both A and B
  • None of the above
The binding energy of Helium nucleus is $$28$$ Mev. What is it's  average binding energy per nucleon ?
  • 102 MeV
  • 56 MeV
  • 14 MeV
  • 7 MeV
The value of 1 amu is equal to:
  • $$1.66\times 10^{-8}g$$
  • $$1.66\times 10^{-4}g$$
  • $$1.66\times 10^{-16}g$$
  • $$1.66\times 10^{-24}g$$
Fusion reaction takes place at very high temperature because
  • atoms are ionised at high temperatures
  • molecules breakup at high temperature
  • nuclei break up at high temperature
  • kinetic energy is high enough to overcome repulsion between nuclei
Which of the following is used as standard for determination of atomic mass unit?
  • $$O^{16}$$
  • $$C^{12}$$
  • $$H^{1}$$
  • $$O^{17}$$
Critical mass is minimum mass necessary for 
  • chain reaction
  • fusion
  • hydrogen bomb
  • all of the above
Which one of the following properties of an element is not variable?
  • Valency
  • Atomic weight
  • Equivalent weight
  • All of these
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (Given 1 u = 931 MeV)
  • 2.67 MeV
  • 26.7 MeV
  • 6.675 MeV
  • 13.35 MeV
The binding energy of a nucleus is equivalent to 
  • the mass of nucleus
  • the mass of proton
  • the mass of neutron
  • the mass defect of nucleus
Sun maintains its shining because of 
  • the fission of helium
  • chemical reactoin
  • fusion of hydrogen nuclei
  • burning of carbon
The major problem in harnessing nuclear energy is how to:
  • split nuclei
  • sustain the reaction
  • dispose off spent fuel safely
  • convert nuclear energy into electrical energy
Hydrogen bomb is based on 
  • controlled chain reaction
  • uncontrolled chain reaction
  • nuclear fusion
  • nuclear fission
The ionisation energy of 10 times ionized sodium atom is
  • $$\frac{{13.6}}{{11}}eV$$
  • $$\frac{{13.6}}{{112}}eV$$
  • $$13.6 \times (11)^2 eV$$
  • $$13.6 eV$$
For the nuclie with mass number > $$100$$
  • binding energy of the nucleus decreases on an average as A increases
  • binding energy of the nucleus increases on an average as A increases
  • The two nuclei fuse to form a bigger nuclide releasing energy
  • The nucleus essentially breaks up into two nuclides of equal mass releasing energy
Mass of one twelth of carbon atom is called atomic mass unit.
  • True
  • False
Joining of light nuclei of elements to form a heavy nucleus with the release of energy is called :
  • nuclear fission
  • nuclear fusion
  • nuclear combustion
  • nuclear combination
In India, a nuclear power plant is located in 
  • Rampur
  • Tarapur
  • Sahranpur
  • Kanpur
Which is the lightest element in the universe?
  • Helium
  • Hydrogen
  • Nitrogen
  • Silicon
The two elements, with same number of electrons but different mass number, are known as 
  • isotopes
  • isomers
  • isotones
  • isobars
The average binding energy per nucleon is maximum for the nucleus
  • $$_{ 2 }H^{ 4 }$$
  • $$_{ 8 }O^{ 16 }$$
  • $$_{ 26 }Fe^{ 56 }$$
  • $$_{ 92 }U^{ 238 }$$
The disposal of waste produced in a nuclear power plant is difficult because they are:
  • highly inflammable
  • highly radioactive
  • highly poisonous
  • extremely heavy
The mass number of sulfur atom is:

(Given: Atomic number = 16 and number of neutrons = 16)
  • 18
  • 32
  • 24
  • 16
Nuclear fusion reactions cannot be harnessed for productive applications because :
  • These reactions require very high temperature and are controllable.
  • These reactions require very high temperature and are uncontrollable.
  • These reactions require very low temperature and are uncontrollable
  • These reactions require very low temperature and are controllable
The high temperature required to initiate the nuclear fusion reaction is to overcome the _______ present between the atoms.
  • nuclear force
  • electrostatic force
  • gravitational force
  • magnetic force
Find the value of $$x$$ in the following nuclear reaction.
$$_{7}{N}^{14}  +  _{2}{He}^{4}  \rightarrow  _{x}{O}^{17}  +  _{1}{H}^{1}$$
  • 6
  • 8
  • 9
  • 7
Find $$x$$ in the following nuclear reaction.

$$_{2}{He}^{4} + _{13}{Al}^{27}  \rightarrow  _{x}{P}^{30} + _{0}{n}^{1}$$
  • 14
  • 13
  • 15
  • 11
Mass of atom expressed in atomic mass unit is :
  • Atomic mass
  • Molecular mass
  • Atomic number 
  • None of the above
What is the atomic mass (u) of calcium?
  • 10
  • 20
  • 30
  • 40
One a.m.u is defined as mass of  :
  • $$\frac{1}{16}^{th}$$ mass of one oxygen atom
  • $$\frac{1}{14}^{th}$$ mass of one atom of nitrogen
  • $$\frac{1}{12}^{th}$$ mass of one carbon-12 atom
  • None of above
Find $$x$$ in the following nuclear reaction.

$$_{12}{Mg}^{24} + _{2}{He}^{4}  \rightarrow  _{14}{Si}^{x} + _{0}{n}^{1}$$
  • 17
  • 27
  • 37
  • 24
Complete the reaction: 
$$_{86}{Rn}^{220}  \rightarrow  _{84}{Po}^{216} + $$ __________
  • $$\beta$$
  • $$\gamma$$
  • $$\alpha$$
  • $${H}_{1}^{1}$$
Radiations from a nuclear power plant is harmful to: 
  • environment
  • human civilization
  • wildlife
  • all of the above
State whether the given statement is True or False :
Nuclear power plants as compared to other plants can generate huge amount of electricity. 
  • True
  • False
State whether the given statement is True or False :
Waste products emitted from nuclear power plants are very harmful.
  • True
  • False
1 kg of ________ can light up $$1$$ bulb for $$3\times10^4$$ years.
  • Uranium
  • Halonium
  • Neutronium
  • Hydronium
From below which are the disadvantages of nuclear energy?
  • High set up cost
  • low set up cost
  • Waste products are useful
  • None
Back isotopes of hydrogen has ________ proton. Fill in the blank.
  • 0 (zero)
  • 1 (one)
  • 2 (two)
  • 3 (three)
What is the biggest advantage of nuclear energy?
  • It is clean.
  • Huge amount of energy is produced.
  • The radioactive emissions from a nuclear power plant are healthy.
  • Nuclear power plant can be easily set up in urban areas.
Health hazards related to nuclear radiations are:
  • causing cancer.
  • causing deformity in the body.
  • damaging the genes of a person.
  • All of the above.
What is the atomic mass (u) of sodium?
  • 22
  • 23
  • 23.5
  • 24
What precautions should be taken against nuclear radiations?
  • The radioactive elements should be kept in containers made up of thick lead walls.
  • The people working in the plants should wear special jackets and gloves made of lead linings.
  • The handling of the plants should be carried out from a distance.
  • All of the above.
Identify the similarity between isotopes of the same element.
  • They have the same particles in the nucleus.
  • They have the same number of neutrons.
  • They are equally abundant in nature.
  • They have the same number of protons
  • They have the same mass.
Which of the following statement best describe Nuclear fusion reaction ?
  • two smaller nuclei are combined into a more massive nuclei.
  • the electrons are exchanged from one or more substances to produce a different substance, and the elements are the same in the products and reactants.
  • the nucleus of a large atom is split into two or more fragments.
  • the particles in the nucleus are changed, and one element is transformed into another element when particles in the nucleus are gained or lost.
  • radiation is made.
Which of the following represents the binding energy of a nucleus:
  • The average energy of each nucleon
  • The energy needed to split the nucleus into its parts
  • The mass-energy difference between protons and neutrons
  • The energy necessary to overcome the neutron-neutron repulsion
  • The energy required to remove a proton from the nucleu
Which of the following is NOT an isotope of uranium?
  • $$_{92}^{236}\textrm{U}$$
  • $$_{91}^{235}\textrm{U}$$
  • $$_{92}^{239}\textrm{U}$$
  • $$_{92}^{235}\textrm{U}$$
  • $$_{92}^{238}\textrm{U}$$
The binding energy per nucleon is maximum in the case
  • $$^{235}_{92}U$$
  • $$^{56}_{26}Fe$$
  • $$^{141}_{56}Ba$$ 
  • $$^2_4He$$
Deuterium is the most common isotope of hydrogen. How many neutrons does it have?
  • 4
  • 3
  • 2
  • 1
  • 0
0:0:1


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