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CHEMISTRY MCQ

Atomic Structure · ICSE STD 8 (ICSE - English Medium). 14 questions.

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14 questions · timed · auto-graded

MCQ 11 Mark
Multiple Choice Questions The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
  • ✓
    mass number
  • B
    atomic number
  • C
    number of electrons
  • D
    all of the above
Answer
Correct option: A.
mass number
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MCQ 21 Mark
Multiple Choice Questions The number of electrons in an atom is equal to number of
  • ✓
    protons in a neutral atom
  • B
    neutrons in a neutral atom
  • C
    nucleons in a neutral atom
  • D
    none of the above
Answer
Correct option: A.
protons in a neutral atom
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MCQ 31 Mark
Multiple Choice Questions If the atomic number of an atom is $17$ and mass number is $35$ then number of neutron will be
  • A
    $35$
  • B
    $17$
  • ✓
    $18$
  • D
    $52$
Answer
Correct option: C.
$18$
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MCQ 41 Mark
Multiple Choice Questions The sub atomic particle with negative charge is
  • A
    proton
  • B
    neutron
  • ✓
    electron
  • D
    nucleon
Answer
Correct option: C.
electron
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MCQ 51 Mark
Multiple Choice Questions number of valence electrons present in magnesium is
  • ✓
    two
  • B
    three
  • C
    four
  • D
    five
Answer
Correct option: A.
two
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MCQ 61 Mark
Multiple Choice Questions The outermost shell of an atom is known as
  • A
    valency
  • B
    valence electrons
  • C
    nucleus
  • ✓
    valence shell
Answer
Correct option: D.
valence shell
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MCQ 71 Mark
Which of the following is used as a coolant in nuclear reactor?
  • ✓
    liquid sodium
  • B
    liquid nitrogen
  • C
    cadmium steel rods
  • D
    plutonium
Answer
Correct option: A.
liquid sodium
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MCQ 81 Mark
$\beta-$particles are actually a stream of
  • A
    protons
  • ✓
    electrons
  • C
    neutrons
  • D
    none of these
Answer
Correct option: B.
electrons
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MCQ 91 Mark
Who discovered that radioactive rays are given out by uranium?
  • A
    Henri Becquerel
  • ✓
    Marie Curie
  • C
    Pierre Curie
  • D
    Schmidt
Answer
Correct option: B.
Marie Curie
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MCQ 101 Mark
How many times is a proton heavier than an electron?
  • A
    $1500$
  • B
    $1800$
  • ✓
    $1840$
  • D
    none of these
Answer
Correct option: C.
$1840$
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MCQ 111 Mark
In $1908, R A$ Millikan found the charge of an electron to be
  • ✓
    $1.6 \times 10^{-19} C$
  • B
    $1.6 \times 10^{-15} C$
  • C
    $1.4 \times 10^{-19} C$
  • D
    $1.6 \times 19^{-16} C$.
Answer
Correct option: A.
$1.6 \times 10^{-19} C$
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MCQ 121 Mark
Which of the following scientists observed that cathode rays consists of negatively charged particles?
  • A
    John Dalton
  • ✓
    J J Thomson
  • C
    James Chadwick
  • D
    Democritus
Answer
Correct option: B.
J J Thomson
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MCQ 131 Mark
Which one of the following scientists put forward the theory regarding the extra$-$nuclear structure of the atom?
  • A
    James Chadwick
  • B
    John Dalton
  • C
    Rutherford
  • ✓
    Niels Bohr
Answer
Correct option: D.
Niels Bohr
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MCQ 141 Mark
Which of these have similar chemical properties but different set of physical properties and mass number?
  • A
    isobars
  • B
    elements
  • ✓
    isotopes
  • D
    none of these
Answer
Correct option: C.
isotopes
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