Chapter 2 – Structure of Atoms

Structure of Atoms – MCQ’s

  1. Matter is composed of tiny indivisible particles called:

(a) Element

(b) Atom ✓

(c) Compound

(d) substance

  1. Atom of the same elements are

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(a) Different

(b) Alike ✓

(c) Comparable

(d) Active

  1. Gas discharge tube experiment was performed by:

(a) J.J. Thomson

(b) Rutherford

(c) Dalton

(d) William Crooks ✓

  1. 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

  1. Who was the pioneer of the vacuum tubes?

(a) William Crooks ✓

(b) Rutherford

(c) Bohr

(d) Dalton

  1. The nature of canal rays depends upon:

(a) Nature of anode

(b) Nature of Cathode

(c) Nature of gas ✓

(d) Nature of particles

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

(a) 1830

(b) 1840 ✓

(c) 2

(d) 3

  1. 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

  1. The highly penetrating rays are:

(a) Alpha particle

(b) Beta particle

(c) Neutron ✓

(d) Both a & b

  1. Neutron was discovered by

(a) Rutherford

(b) Chadwick ✓

(c) Bohr

(d) William Crooks

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

(a) Silver

(b) Tin

(c) Platinum

(d) Gold ✓

  1. Alpha particles are emitted by radioactive element:

(a) Carbon

(b) Polonium ✓

(c) Neon

(d) Vanadium

  1. Rutherford used the photographic plate coated with

(a) Zinc sulphide ✓

(b) Zinc sulphite

(c) Zinc oxide

(d) Zinc sulphate

  1. Who is the father of nuclear chemistry?

(a) Rutherford ✓

(b) Dalton

(c) William Crooks

(d) Joseph Proust

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

(a) Continuous spectrum

(b) Line spectrum ✓

(c) Emission spectrum

(d) Absorption spectrum

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

(a) Ion

(b) Molecular ion

(c) Electron ✓

(d) Positron

  1. Matter is composed of tiny indivisible particles called:

(a) Ion

(b) Free radical

(c) Atoms ✓

(d) Molecules

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

(a) Chroma ✓

(b) Divisible

(c) Atomos

(d) Same place

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

(a) 0.00004cm ✓

(b) 0.004cm

(c) 0.0004cm

(d) 0.04cm

  1. Canal rays were discovered by:

(a) Goldstein ✓

(b) Thomson

(c) Dalton

(d) William Crooks

  1. Protons were discovered by:

(a) Thomson

(b) Chadwick

(c) Moseley

(d) Goldstein ✓

  1. Rutherford bombarded a thin sheet of gold with:

(a) a-particles ✓

(b) b-particles

(c) g-particles

(d) x-rays

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

(a) Test tube

(b) Gas discharge tube ✓

(c) Zinc plate

(d) Electrolytic cell

  1. 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

  1. The electrons revolve around the:

(a) Atom

(b) Nucleus ✓

(c) Protons

(d) Neutrons

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

(a) Canal rays ✓

(b) x-rays

(c) Cathode rays

(d) β-rays

  1. Alpha particles are basically nucleus of:

(a) Lithium

(b) Sodium

(c) Potassium

(d) Helium ✓

  1. Plum pudding model was put forwarded by:

(a) Dalton

(b) Thomson ✓

(c) Goldstein

(d) Chadwick

  1. Neil Bohr won the noble prize in:

(a) 1914

(b) 1918

(c) 1922 ✓

(d) 1926

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

(a) Opposite ✓

(b) Same

(c) Parallel

(d) None of these

  1. 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

  1. Canal rays carry:

(a) +ve charge ✓

(b) –ve charge

(c) Neutral

(d) None of these

  1. Which isotope of carbon is in abundance?

(a) 12C ✓

(b) 13C

(c) 14C

(d) Both a and b

  1. Isotopes have different number of :

(a) Electron

(b) Proton

(c) Neutron ✓

(d) Charge

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

(a) K

(b) K, L

(c) K, L, M ✓

(d) L, M

  1. Quantum means:

(a) Fixed volume

(b) Fixed energy ✓

(c) Fixed pressure

(d) Fixed temperature

  1. The subshells of M-shell are:

(a) s, p

(b) s, p, d ✓

(c) s, p, d, f

(d) s, d, f

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

(a) 8

(b) 2

(c) 18

(d) 32 ✓

  1. 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

  1. Which one is the electronic configuration of sulphur?

(a) 1s2, 2s2, 2p6, 3s2, 3p6,

(b) 1s2, 2s2, 2p6, 3s2, 3p6

(c) 1s2, 2s2, 2p6, 3s2, 3p4

(d) 1s2, 2s2, 2p6, 3s2, 3p3

  1. 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

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

(a) Cathode rays

(b) Canal rays ✓

(c) x-rays

(d) Alpha rays

  1. The concept of orbit was introduced by:

(a) J.J. Thomson

(b) Rutherford

(c) Bohr ✓

(d) Planck

  1. Deutrium is used to make:

(a) Light water

(b) Heavy water ✓

(c) Soft water

(d) Hard water

  1. Co-60 is the source of:

(a) X-rays

(b) Beta radiations

(c) Alpha particles

(d) Gamma rays ✓

  1. 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

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

(a) K

(b) L

(c) M

(d) N ✓

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

(a) Protium

(b) Deutrium ✓

(c) Tritium

(d) Helium

  1. Beta radiations are emitted by:

(a) Co-60

(b) C-12

(c) S-16

(d) Sr-90 ✓

  1. Rutherford won nobel prize in:

(a) 1909

(b) 1906

(c) 1908 ✓

(d) 1910

  1. freeilm-content-image

(a) 10 p

(b) -10 e

(c) 10 n ✓

(d) 42 He

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  1. Atika naseer

    Great website for test session

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