• June 20, 2021

Physics MCQ on Mass Defect for NEET, JEE, Medical and Engineering Exam 2021

MCQ on Mass Defect: Mass defect is the difference between the actual atomic mass and the predicted mass calculated by adding the mass of protons and neutrons present in the nucleus. The actual atomic mass is less than the predicted mass calculated by adding the masses of nucleons. This additional mass is accounted for by binding energy that is released when a nucleus is formed. When a nucleus is formed, some of the mass is converted to energy and this results in the mass defect. Due to this reason, the actual mass of an atomic nucleus is less than the mass of particles it is made up of. 

In this post we are providing you MCQ on Mass Defect, which will be beneficial for you in upcoming NEET, AIIMS, JEE, WBJEE, Medical and Engineering Exams.

MCQ on Mass Defect

MCQ on Mass Defect


Q1. The Binding energy per nucleon of 3Li7 and 2He4 nuclei are 5.60 meV and 7.60 meV respectively. In the nuclear reaction 3Li7+1H1 ➡️ 2He4+2He4+Q, the value of energy Q released is ______.
a) 19.6 MeV
b) -2.4MeV
c) 8.4MeV
d) 17.3 MeV

View Answer

(d) 17.3 MeV

Q2. The mass defect for an isotope is 0.410 amu/atom .Calculate the value of binding energy.
a) 1.23×1020 
b) 2.23×103 
c) 3.69×1010  
d) 3.69×1013 

View Answer

(c) 3.69×1010 

Q3.If the radius of the 13Al27 nucleus is taken to be RAl  then the radius of 53Te125 nucleus is nearly
a) (53/13)1/3RAl
b) 5/3 RAl
c) ⅗ RAl
d) (13/53)1/3RAl

View Answer

(b) 5/3 RAl

Q4.Which of the following sentence is incorrect?
a) Nuclear binding energy is the energy released in the formation of an atom from subatomic particles
b) It the nucleus was formed from initially separated protons and electrons then the amount of matter converted into energy was called Mass defect.
c) The total mass of protons and electrons in the atom.
d) The most stable nuclei are molecules with the highest binding energy.

View Answer

(c) The total mass of protons and electrons in the atom 

Q5. A nucleus of uranium decays at rest into nuclei of thorium and helium. Then,
a) The helium nucleus has more kinetic energy than the thorium nucleus
b) The helium nucleus has less momentum than the thorium nucleus
c) The  helium nucleus has more momentum than the thorium nucleus
d) The  helium nucleus has less kinetic energy than the thorium nucleus

View Answer

(a)The helium nucleus has more kinetic energy than the thorium nucleus  

Q6. Calculate the mass defect(amu/atom) for a 37Cl atom for which the actual mass is 36.966 amu.
a) 0.341 amu
b) 0.388 amu
c) 0.623 amu
d) 0.264 amu

View Answer

(a) 0.341 amu

Q7.A nucleus has a mass number A, atomic number Z and a binding energy B. The mass of neutron and proton are mn and mp respectively and cis the speed of light. 

Which  of the following expressions correctly represents the mass of the nucleus?                                                       
a) (A-Z)mn+Zmp-B/c2
b) (A-Z)mn+Zmp+B/c2
c) (A+Z)mn+Zmp-B/c2
d) (A+Z)mn+Zmp+B/c2

View Answer

(a) (A-Z)mn+Zmp-B/c2

Q8. Which isotope below has the highest binding energy?
a) 4He
b) 16O
c) 32S
d) 55Mn

View Answer

(d) 55Mn 


Download MCQ on Mass Defect PDF

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