Nuclei MCQs For NEET

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Questions
1 The helium atom does not contain
A two protons
B two electrons
C two neutrons
D six nucleons

Answer:six nucleons
2 Energy of electron in the 1st orbit of H-atom is:
A -13.6 MeV
B -13.6 eV
C -13.6 J
D 13.6 J

Answer:-13.6 eV
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3 Mass is converted into energy according to the relation:
A E = me²
B E = mgh
C class 12 physics chapter 13 nuclei
D class 12 physics chapter 13 nuclei

Answer:E = me²
4 The isotope generally used for the treatment of cancer is:
A I131
B Hg197
C O15
D Co60

Answer:Co60
5 Which of the following atoms has the lowest ionization potential?
A class 12 physics chapter 13 nuclei
B class 12 physics chapter 13 nuclei
C class 12 physics chapter 13 nuclei
D class 12 physics chapter 13 nuclei

Answer:C
6 Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. Find the ration of remaining number of A and B nuclei after 80 minutes.
A 1 : 1
B 4 : 1
C 1 : 4
D 1 : 16

Answer:1 : 4
7 The binding energy per nucleon for the parent nucleus is E1 and that for the daughter nuclei is E2. Then
A E1 > E2 
B E2 > E2
C E1 = 2E2
D E2 = 2E1

Answer:E2 > E2
8 In a sample off radioactive substance, what percentage decays in one mean life time?
A 70 %
B 63.2 %
C 45.8 %
D 23%

Answer:63.2 %
9 The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
A isobar of parent
B isomer of parent
C isotone of parent
D isotope of parent

Answer:isotope of parent
10 A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme :

class 12 physics chapter 13 nuclei

If the mass number and atomic number of A are 180 and 72 respectively then the mass number and atomic number for A4 are

A 69 and 172 respectively
B 115 and 71 respectively
C 172 and 69 respectively
D None of these

Answer:172 and 69 respectively
11 The half life period of a radioactive material if its activity drops to (1/16)th of its initial value in 30 years is
A 1.5 years
B 3.5 years
C 7.5 years
D 15 years

Answer:7.5 years
12 There are 106 radioactive nuclei in a given radioactive element. Its half life is 20 seconds. The number of nuclei will remain left after 10 seconds are:
A 3 × 106
B 3 × 105
C 7 × 105
D 2 × 105

Answer:7 × 105
13 The ratio of nuclear radii and nuclear densities of 26Fe56 and 92U238 is
A 0.671 and 1 respectively
B 1 and 0.671 respectively
C both equal to 1
D both equal to 0.671

Answer:0.671 and 1 respectively
14 Artificial radioactivity was discovered by
A Klaproth
B Rontgen
C Irene Curie and Joliot
D P. Curie and M. Curie

Answer:Irene Curie and Joliot
15 Radioactive samples are stored in lead boxes because it is
A heavy
B strong
C good absorber
D bad conductor

Answer:good absorber
16 Which of the following is not a mode of radioactive decay ?
A Positron emission
B Electron capture
C Fusion
D Alpha decay

Answer:Fusion
17 Beta rays emitted by a radioactive material are
A electromagnetic radiations
B the electrons orbiting around the nucleus
C charged particles emitted by nucleus
D neutral particles

Answer:charged particles emitted by nucleus
18 γ-rays are deflected by
A an electric field but not by a magnetic field
B a magnetic field but not by an electric field
C both electric and magnetic field
D neither by electric field nor by magnetic field

Answer:neither by electric field nor by magnetic field
19 The antiparticle of electron is
A positron
B α-particle
C proton
D β-particle

Answer:positron
20 Nuclear forces are
A spin dependent and have no non-central part
B spin dependent and have a non-central part
C spin independent and have no non-central part
D spin independent and have a non-central part

Answer:spin dependent and have a non-central part

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