HSSC-II (Class-12) Solved Physics MCQs; Unit-20: Nuclear Physics; (New Book/KPK Text Board, Peshawar) With Verified Answers

1. One unified mass scale (1u) is equal to:

A. 1.660 ｘ 10⁻²⁷kg
B. 1.4924ｘ10⁻¹⁰ J
C. 931.5 MeV
D. All of these

... Answer is A. 1.660 ｘ 10⁻²⁷ kg
--------------------------

2. The number of neutrons in `\ ^{7}Li` is

A. 7
B. 4
C. 3
D. 2

... Answer is B. 4
----------------------

3. Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is

A. smaller
B. greater
C. same
D. infinite

... Answer is B. greater
---------------------------

4. Which one of the following nuclear radiation is similar to electrons

A. α
B. β⁺
C. β⁻
D. Ɣ

... Answer is C. β⁻
--------------------------------

5.  One curie is equal to

A. 3.70 ｘ 10⁻¹⁰ Bq
B. 1 MBq
C. 1 ｘ 10¹⁰ Bq
D. 3.70 ｘ 10¹⁰ Bq

... Answer is D. 3.70 ｘ 10¹⁰ Bq
------------------------

6. Half-life of the lodine-131 ( ¹³¹I ) is 8.02 days and its weight is 20 mg. After 4 half-lives, the amount left un-decayed will be:

A. 5 mg
B. 2.5 mg
C. 1.25 mg
D. 0.625 mg

... Answer is C. 1.25 mg
------------------------------

7. The unit of decay constant λ is :

A. m
B. m⁻¹
C. s
D. s⁻¹

... Answer is D. s⁻¹
--------------------------

8. In fission of `\ ^{235}U`, neutrons used have energies of about

A. 5 MeV
B. 0.6 keV
C. 8.6 eV
D. 0.04 eV

... Answer is D. 0.04 eV
-------------------------

9. The nucleus that results from the reaction `\ _0^{1}n` + `\ _8^{16}N` ⟶ ? + `\ _1^{2}H` is

A. `\ _0^{15}N`
B. `\ _8^{17}O`
C. `\ _8^{14}O`
D. `\ _7^{14}N`

... Answer is A. `\ _0^{15}N`
------------------------

10. The resulting nucleus in the reaction `\ _0^{1}n` + `\ _{56}^{137}Ba` ⟶ ? + γ is

A. `\ _{56}^{138}Ba`
B. `\ _{55}^{138}Cs`
C. `\ _{57}^{138}La`
D. `\ _{56}^{136}Ba`

... Answer is A. `\ _{56}^{138}Ba`
----------------------

11. The quantity of `\ ^{235}U` in naturally occurring uranium is about

A. 0.7%
B. 30%
C. 70%
D. 99.3%

... Answer is A. 0.7%
------------------------------

12. In Liquid Metal Fast Breeder Reactor (LMFBR), the type of uranium used is

A. `\ ^{234}U`
B. `\ ^{235}U`
C. `\ ^{238}U`
D. `\ ^{239}U`

... Answer is C. `\ ^{238}U`
-------------------------

13. Nuclear force exists between

A. Proton Proton
B. Proton Neutron
C. Neutron Neutron
D. All of these

... Answer is D. All of these
: -------------------------

14.  Which of the following is a boson

A. proton
B. neutrino
C. photon
D. pion

... Answer is C. photon
----------------------------

15. The hadrons formed by the combination of quark and anti-quark pairs are called

A. baryons
B. mesons
C. melons
D. neutrinos

... Answer is B. mesons
Given: --------------------------

16.. All free particles have a color charge of

A. 0
B. 2/3
C. 1/3
D. 1

... Answer is A.  0
---------------------------

************************************

Shortcut Links For 

1. National MDCAT, ECAT, JOB EXAM Physics MCQs Preparation (New) 
2. Physics (New) 11th Class SLO Based Notes
3. Physics (New) 11th class MCQs Quizzes All Units
4. Physics (New) 12th Class SLO Based Notes
5. Physics (New) 12th class MCQs Quizzes All Units

1. Website for School and College Level Physics   

(https://askrarequiz.blogspot.com)

2. Website for School and College Level Mathematics  

(https://askraremaths.blogspot.com)

3. Website for Single National Curriculum Pakistan - All Subjects Notes 

(https://askrareclassnotes.blogspot.com/)

© 2022-Onwards by Academic Skills and Knowledge (ASK)     

Note:  Write to me in the comment box below for any query and also Share this information with your class-fellows and friends.