Q1) Which subatomic particle has a positive charge?

A) Electron

B) Proton

C) Neutron

D) Positron

Q2) What is the charge of an alpha particle?

A) +1e

B) +2e

C) -1e

D) -2e

Q3) The number of protons in the nucleus of an atom determines its:

A) Mass number

B) Atomic number

C) Isotopic number

D) Neutron number

Q4) What is the mass number of an atom equal to?

A) Number of neutrons

B) Number of protons

C) Sum of protons and neutrons

D) Number of electrons

Q5) Which particle is emitted during beta decay?

A) Proton

B) Neutron

C) Electron

D) Alpha particle

Q6) The nucleus of an atom consists of:

A) Protons and electrons

B) Neutrons and electrons

C) Protons and neutrons

D) Electrons and positrons

Q7) What is the SI unit of radioactivity?

A) Curie

B) Rutherford

C) Becquerel

D) Gray

Q8) Which of the following has the least penetrating power?

A) Alpha particles

B) Beta particles

C) Gamma rays

D) X-rays

Q9) What is the process by which an unstable nucleus emits radiation?

A) Ionization

B) Radioactivity

C) Fission

D) Fusion

Q10) Which type of radiation is deflected by an electric field?

A) Alpha

B) Beta

C) Gamma

D) All of the above

Q11) Which of the following is an example of artificial transmutation?

A) Carbon dating

B) Uranium decay

C) Neutron capture

D) Nuclear fission

Q12) What is the energy equivalent of 1 atomic mass unit (amu)?

A) 931 MeV

B) 1 MeV

C) 511 keV

D) 1 eV

Q13) The time taken for a radioactive substance to reduce to half of its original amount is called:

A) Decay constant

B) Half-life 

C) Activity

D) Decay rate

Q14) Which particle has the least rest mass?

A) Proton

B) Neutron

C) Electron

D) Positron

Q15) Which law states that the rate of radioactive decay of a sample is directly proportional to the number of radioactive nuclei present?

A) Avogadro's Law

B) Faraday's Law

C) Newton's Law

D) Law of Radioactive Decay

Q16) Which of the following is not a type of radioactive decay?

A) Alpha decay

B) Beta decay

C) Gamma decay

D) Nuclear fusion

Q17) The process of combining two light nuclei to form a heavier nucleus is called:

A) Fission

B) Fusion

C) Transmutation

D) Decay

Q18) What is the charge of a neutron?

A) +1e

B) +2e

C) 0

D) -1e

Q19) What is the unit of activity of a radioactive sample?

A) Curie

B) Becquerel

C) Sievert

D) Tesla

Q20) Which of the following elements has the highest atomic number?

A) Uranium

B) Plutonium

C) Radon

D) Radium