Structure of Atoms – MCQ’s

(a) Different

(b) Alike ✓

(c) Comparable

(d) Active

3. Gas discharge tube experiment was performed by:

(a) J.J. Thomson

(b) Rutherford

(c) Dalton

(d) William Crooks ✓

4. The pressure inside the discharge tube for the discovery of electron was kept

(a) 10⁴ _­atm

(b) 10^-4 _­atm ✓

(c) 10¹⁴ _­atm

(d) 10^-14_­ atm

5. Who was the pioneer of the vacuum tubes?

(a) William Crooks ✓

(b) Rutherford

(c) Bohr

(d) Dalton

6. The nature of canal rays depends upon:

(a) Nature of anode

(b) Nature of Cathode

(c) Nature of gas ✓

(d) Nature of particles

7. The mass of proton is ______ times more than that of an electron:

(a) 1830

(b) 1840 ✓

(c) 2

(d) 3

8. Which one of the followings is produced by the bombardment of the helium particle on beryllium?

(a) Alpha particle

(b) Beta particle

(c) Neutron ✓

(d) Gamma rays

9. The highly penetrating rays are:

(a) Alpha particle

(b) Beta particle

(c) Neutron ✓

(d) Both a & b

10. Neutron was discovered by

(a) Rutherford

(b) Chadwick ✓

(c) Bohr

(d) William Crooks

11. In -scattering experiment Rutherford used the foil made up of:

(a) Silver

(b) Tin

(c) Platinum

(d) Gold ✓

12. Alpha particles are emitted by radioactive element:

(a) Carbon

(b) Polonium ✓

(c) Neon

(d) Vanadium

13. Rutherford used the photographic plate coated with

(a) Zinc sulphide ✓

(b) Zinc sulphite

(c) Zinc oxide

(d) Zinc sulphate

14. Who is the father of nuclear chemistry?

(a) Rutherford ✓

(b) Dalton

(c) William Crooks

(d) Joseph Proust

15. According to quantum theory which type of spectrum is shown?

(a) Continuous spectrum

(b) Line spectrum ✓

(c) Emission spectrum

(d) Absorption spectrum

16. Which of the following are fundamental particles of an atom?

(a) Ion

(b) Molecular ion

(c) Electron ✓

(d) Positron

17. Matter is composed of tiny indivisible particles called:

(a) Ion

(b) Free radical

(c) Atoms ✓

(d) Molecules

18. The meaning of Latin word ‘atom’ is:

(a) Chroma ✓

(b) Divisible

(c) Atomos

(d) Same place

19. Rutherford used a thin sheet of gold of thickness:

(a) 0.00004cm ✓

(b) 0.004cm

(c) 0.0004cm

(d) 0.04cm

20. Canal rays were discovered by:

(a) Goldstein ✓

(b) Thomson

(c) Dalton

(d) William Crooks

21. Protons were discovered by:

(a) Thomson

(b) Chadwick

(c) Moseley

(d) Goldstein ✓

22. Rutherford bombarded a thin sheet of gold with:

(a) a-particles ✓

(b) b-particles

(c) g-particles

(d) x-rays

23. Which apparatus was used by Sir William Crooks in his experiment?

(a) Test tube

(b) Gas discharge tube ✓

(c) Zinc plate

(d) Electrolytic cell

24. Which are three fundamental particles of an atom?

(a) Ion, radicals, free radicals

(b) Electrons, protons, neutrons ✓

(c) Electrons, protons, cathode rays

(d) Canal rays, x-rays, gamma rays

25. The electrons revolve around the:

(a) Atom

(b) Nucleus ✓

(c) Protons

(d) Neutrons

26. Nature of gas present in discharge tube affects the nature of:

(a) Canal rays ✓

(b) x-rays

(c) Cathode rays

(d) β-rays

27. Alpha particles are basically nucleus of:

(a) Lithium

(b) Sodium

(c) Potassium

(d) Helium ✓

28. Plum pudding model was put forwarded by:

(a) Dalton

(b) Thomson ✓

(c) Goldstein

(d) Chadwick

29. Neil Bohr won the noble prize in:

(a) 1914

(b) 1918

(c) 1922 ✓

(d) 1926

30. Canal rays travel in a straight line in a direction _______ to cathode rays.

(a) Opposite ✓

(b) Same

(c) Parallel

(d) None of these

31. Rutherford, Moseley, Bohr and other scientists performed experiments and revealed that:

(a) Atom has complex nature

(b) Atom is neutral

(c) Atom can be divisible ✓

(d) Atom is beyond understanding

32. Canal rays carry:

(a) +ve charge ✓

(b) –ve charge

(c) Neutral

(d) None of these

33. Which isotope of carbon is in abundance?

(a) ¹²C ✓

(b) ¹³C

(c) ¹⁴C

(d) Both a and b

34. Isotopes have different number of :

(a) Electron

(b) Proton

(c) Neutron ✓

(d) Charge

35. Energy of N-shell is more than the energies of:

(a) K

(b) K, L

(c) K, L, M ✓

(d) L, M

36. Quantum means:

(a) Fixed volume

(b) Fixed energy ✓

(c) Fixed pressure

(d) Fixed temperature

37. The subshells of M-shell are:

(a) s, p

(b) s, p, d ✓

(c) s, p, d, f

(d) s, d, f

38. N-shell can accommodate a maximum of ____ electrons.

(a) 8

(b) 2

(c) 18

(d) 32 ✓

39. Which one is the electronic configuration of Cl^-1?

(a) 1s², 2s², 2p⁶, 3s¹

(b) 1s², 2s², 2p⁶, 3s², 3p⁶ ✓

(c) Both a and b

(d) None of these

40. Which one is the electronic configuration of sulphur?

(a) 1s², 2s², 2p⁶, 3s²_, 3p^6,

(b) 1s², 2s², 2p⁶, 3s², 3p⁶

(c) 1s², 2s², 2p⁶, 3s², 3p⁴✓

(d) 1s², 2s², 2p⁶, 3s², 3p³

41. The value of Planck’s constant is:

(a) 6.62×10^-34 Js ✓

(b) 6.62×10^-24 Js

(c) 6.62×10^-19 Js

(d) 6.62×10^-12 Js

42. Which one of the followings results in the discovery of proton?

(a) Cathode rays

(b) Canal rays ✓

(c) x-rays

(d) Alpha rays

43. The concept of orbit was introduced by:

(a) J.J. Thomson

(b) Rutherford

(c) Bohr ✓

(d) Planck

44. Deutrium is used to make:

(a) Light water

(b) Heavy water ✓

(c) Soft water

(d) Hard water

45. Co-60 is the source of:

(a) X-rays

(b) Beta radiations

(c) Alpha particles

(d) Gamma rays ✓

46. For the production of cathode rays the pressure of gas inside the discharge tube was Kept:

(a) 10^-1atm

(b) 10^-2atm

(c) 10^-4atm ✓

(d) 10^-5atm

47. Which one of the shells contains f–subshells?

(a) K

(b) L

(c) M

(d) N ✓

48. Which one of the followings has only one neutron in its nucleus?

(a) Protium

(b) Deutrium ✓

(c) Tritium

(d) Helium

49. Beta radiations are emitted by:

(a) Co-60

(b) C-12

(c) S-16

(d) Sr-90 ✓

50. Rutherford won nobel prize in:

(a) 1909

(b) 1906

(c) 1908 ✓

(d) 1910

51. 

(a) ¹₀ p

(b) ^-1₀ e

(c) ¹₀ n ✓

(d) ⁴₂ He

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