Q.1. The atomic number and mass for a specimen are Z and A respectively. The number of in the atom will be
(A) A
(B) Z
(C) A+Z
(D) A-Z
Ans :- (D)
Q.2. The quantities, which remain conserved in a nuclear reaction
(A) Total charge
(B) Angular momentum
(C) Linear momentum
(D) All the above
Ans :- (D)
Q.3. β-rays are deflected in
(A) Gravitational field
(B) Only in magnetic field
(C) Only in electrical field
(D) In magnetic and electric field both
Ans :- (D)
Q.4. Which one of the following pairs of nuclei are isotones ?
(A) ₃₄Se⁷⁴, ₃₁Ga⁷¹
(B) ₃₈Sr⁸⁴,₃₈Sr⁸⁶
(C)₄₂Mo⁹², ₄₀Zr⁹²
(D) ₂₀Ca⁴⁰, ₁₆S³²
Ans :- (A)
Q.5. The decay constant at the end of a radioactive series is
(A) Zero
(B) infinite
(C) uncertain
(D) None of these
Ans :- (A)
Q.6. γ – rays are
(A) fast moving electrons
(B) helium nuclei
(C) electromagnetic radiation of very high frequency
(D) none of these
Ans :- (C)
Q.7. β – rays are fast moving
(A) protons
(B) neutrons
(C) electrons
(D) none of these
Ans :- (C)
Q.8. α – particles are
(A) electrons
(B) electromagnetic radiation
(C) helium nuclei
(D) hydrogen nuclei
Ans :- (C)
Q.9. The life of any radioactive material is
(A) infinite
(B) finite
(C) can have any value
(D) None of these
Ans :- (A)
Q.10. Which one of the following will not be deflected in a magnetic field ?
(A)α – rays
(B)β – rays
(C)γ – rays
(D)none of these
Ans :-(C)
Q.11. Chadwick discoverd
(A) radio activity
(B) electron
(C) proton
(D) neutron
Ans :- (D)
Q.12. Which of the following is an electromagnetic wave in character ?
(A) α rays
(B) β rays
(C) γ rays
(D) none of these
Ans :- (C)
Q.13. Which of the following is uncharged particles
(A) α particle
(B) β particle
(C) proton
(D) photon
Ans :- (D)
Q.14. α – Rays are deflected in
(A) Gravitational field
(B) Only in magnetic field
(C) Only in electrical field
(D) In magnetic and electric field both
Ans :- (D)
Q.15. Which of the following arrangement is in the increasing order of ionising power
(A) α, β, γ
(B) γ, β, α
(C)β, α, γ
(D)α, γ, β
Ans :- (B)
Q.16. The mother and the daughter element with the emission of α – particle are
(A) isotopes
(B) isobars
(C) isomers
(D) isodiaphores
Ans :- (D)
Q.17. The nuclide ₉₂U²³⁸ has all the following except
(A) 92 Protons
(B) 146 Neutrons
(C) 238 Nucleons
(D) 92 electrons
Ans :- (D)
Q.18. In which of the following emissions from atom, an element does not change ?
(A)α – decay
(B)β⁺ – decay
(C)β⁻ – decay
(D)γ – decay
Ans :- (D)
Q.19. A nucleus must have
(A) Proton
(B) neutron
(C) electron
(D) Positron
Ans :- (A)
Q.20. The SI unit of ‘activity’ in radio activity is
(A) Ci
(B) Bq
(C) mCi
(D) rad
Ans :- (B)