Unit 6 Structure of Atoms – General Science MCQs class 7

Unit-6-Structure-of-Atoms-General-Science-MCQs-class-7

Class 7 General Science, Chapter # 6, MCQs with answers

Online test MCQs preparation for ETEA, NTS, KPPSC, PPSC, FPSC or any type of competitive Exams as well as for kpk teaching posts

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Also Read: Unit 5, Water – General Science MCQs class 7

  1. ____ has mass and occupies space
  • Matter 
  • Atom 
  • Action and reaction
  • Inertia 
  1. ____ are the basic building block of matter and can take part in a chemical reaction.
  • Molecule  
  • Atom 
  • Sun light 
  • Soil 
  1. The idea that all matter is made up of atoms was first proposed by the ____ philosopher.
  • Latin
  • British 
  • Greek 
  • French  
  1. The idea of atoms was first proposed by the Greek philosopher Democritus in
  • 3rd century BC
  • 5th Century AD 
  • 3rd century AD
  • 5th Century BC
  1. The word atom is derived from the Greek word “atomos” which means:
  • Small 
  • Smallest 
  • Things 
  • Indivisible 
  1. Sub-atomic or fundamental particles of atom have ____ types:
  • 3
  • 9
  • 2
  1. Protons and neutrons are responsible for most of the _____
  • Atomic number
  • Atomic Mass
  • Both A & B 
  • None of these
  1. _____ reside in the nucleus.
  • Protons   
  • Neutrons  
  • Both A & B 
  • None of these
  1.  ______ have a positive (+) charge
  • Protons   
  • Neutrons
  • Electrons 
  • Atom  
  1. ______ no charge.
  • Protons   
  • Neutrons
  • Electrons 
  • Atom  
  1. ____ have a negative charge.
  • Protons   
  • Neutrons
  • Electrons 
  • None of these    
  1. ____ revolve in orbits around the nucleus. 
  • Protons   
  • Neutrons
  • Electrons 
  • None of these   
  1.  Electron revolve around the nucleus in particular paths called
  • orbit
  • shells  
  • Both A & B 
  • None of these 
  1. The first orbit near the nucleus is:
  • L-shell 
  • K-shell
  • M-shell
  • N-shell
  1. The general formula for electrons distribution is:
  • 2n
  • 2+n
  • 2n2  
  • 2n4
  1. The maximum number of electrons in first orbit K=
  • 1
  • 3
  • 2
  • 4
  1. The maximum number of electrons in second orbit L=
  • 2
  • 6
  • 8
  1. The maximum number of electrons in third orbit M=
  • 18
  • 14
  • 10
  • 8
  1. The maximum number of electrons in fourth orbit N=
  • 18
  • 25
  • 32 
  • 42
  1. The outer most orbit cannot have more than _____ electrons
  • 18 
  • 8
  • 32
  1. _____ is the number of protons or electrons
  • Atomic mass 
  • Atomic number
  • Atom 
  • Neutrons 
  1. Atom is electrically ____
  • negative
  • Positive 
  • consumer
  • Neutral 
  1. The number of protons and the number of electrons are ___ 
  • Opposite 
  • Invisible 
  • Close
  • Equal 
  1. Atomic number is denoted by  _____ 
  • ‘A’
  • ‘K’
  • ‘M’
  • ‘Z’
  1. The sum of the number of protons and number of neutrons
  • Mass number
  • Atomic mass
  • Both of them
  • None of these
  1. Mass number is nearly equal to atomic mass of an atom and is denoted by:
  • ‘A’
  • ‘K’
  • ‘M’
  • ‘Z’
  1. Protons and neutrons reside in the nucleus, thus they are also known as:
  • Element  
  • Nucleus  
  • Neutral 
  • Nucleons  
  1. The combining capacity of the atoms to form molecules either with same or different elements is known as
  • ION
  • Valency 
  • Chemical formula
  • Isotopes 
  1. ____ depends upon the number of electrons present in the outermost shell.
  • ION
  • Valency 
  • Chemical formula
  • Isotopes 
  1. Atoms containing less than four electrons in its outermost shell, its valency is equal to the number of:
  • Electrons present in K-shell
  • Electrons present in valence shell
  • Electrons present in M-shell 
  • Electrons present in L-shell
  1. Sodium has one electron in its outermost shell, so the valency of sodium is:
  • 2
  • 0 
  1. If the outermost shell has more than four electrons, its valency will be equal to 8 minus the number of:
  • Electrons present in K-shell
  • Electrons present in the outermost shell
  • Electrons present in M-shell 
  • Electrons present in L-shell
  1. Chlorine has seven electrons in its outermost shell, so the valency of chlorine is:
  • 1
  • 2 
  1. ____ is a charged particle that is formed by the removal or addition of one or more electrons from an atom or molecule. 
  • ION
  • Valency 
  • Chemical formula
  • Isotopes 
  1. Ions have ____ types:
  • 1
  1. If an electron or more than one electrons are removed from an atom, it become a positive ion which is also known as:
  • Cation 
  • Anion 
  • Valency 
  • Chemical formula
  1. If an electron or more than one electrons are added to an atom, it becomes a negative ion which is also known as:
  • Cation 
  • Anion 
  • Valency 
  • Chemical formula
  1. The representation of a molecule of a compound in the form of symbols is called:
  • Cation 
  • Anion 
  • Valency 
  • Chemical formula
  1. With the help of chemical formula we can find:
  • Name of elements present in the molecule.
  • Number of atoms of each element.
  • Composition of a compound.
  • All of these
  1. Atoms of same element having same number of protons but different number of neutrons are called:
  • ION
  • Valency 
  • Chemical formula
  • Isotopes 
  1. The chemical properties of isotopes are the:
  • Different 
  • Same 
  • Few 
  • Many 
  1. Physical properties of some isotopes may be:
  • Different 
  • Same 
  • Few 
  • Many 
  1. Some isotopes are radioactive i.e they “radiate”:
  • water
  • Energy  
  • Light 
  • Air 
  1. The atoms of same elements which have same atomic number but different mass number are called:
  • ION
  • Valency 
  • Chemical formula
  • Isotopes 
  1. Hydrogen has ____ isotopes:
  • 1
  •  2
  •  3
  •  4
  1. Ordinary naturally occurring hydrogen contains the largest percentage of:
  • Protium “H”
  • Deuterium “D”
  • Tritium “T”
  • None of these
  1. Protium hydrogen has one proton, ____ neutron and one electron.
  • 1
  • 2
  • 3
  • no
  1. Heavy hydrogen is:
  • Protium “H”
  • Deuterium “D”
  • Tritium “T”
  • None of these
  1. Deuterium “D” has one proton, ____ neutron and one electron.
  • 1
  • 2
  • 3
  • no
  1. Radioactive isotope of hydrogen is:
  • Protium “H”
  • Deuterium “D”
  • Tritium “T”
  • None of these
  1. The number of tritium isotope is one in ____ millions.
  • 10
  • 15
  • 20
  • 25
  1. Tritium isotope has one proton, ____ neutron and one electron.
  • 1
  • 2
  • 3
  • no
  1. An isotope of ____ is used as fuel in a nuclear reactor.
  • Cobalt
  • Goiter
  • Carbon
  • Uranium 
  1. An isotope of ____ is used in the treatment of cancer.
  • Cobalt
  • Goiter
  • Carbon
  • Uranium 
  1. For treatment of goiter, an isotope of ____ is used:
  • Cobalt
  • iodine
  • Carbon
  • Uranium
  1. An isotope of ____ is used to determine the age of old material like trees.
  • Cobalt
  • iodine
  • Carbon (C-14)
  • Uranium
  1. ____ isotopes are used to detect the leakage of pipelines.
  • Cobalt
  • iodine
  • Carbon (C-14)
  • Radio 
  1. Atoms of different elements with different atomic numbers but have the same mass number are called:
  • Isobars 
  • Valency 
  • Chemical formula
  • Isotopes 
  1. Law of constant composition was presented by:
  • Sir john Martial
  • Democritus
  • Alfarabi
  • Joseph Proust
  1. Every simple of pure substance always contains same elements in fixed proportion regardless of:
  • Its source and method of preparation
  • Its physical and chemical change
  • Both of the above
  • None of the above
  1. Water always contain:
  • 11.11% hydrogen
  • 88.88% oxygen
  • Both of the above
  • None of the above
  1. Each sample of carbon dioxide contains:
  • 72.72% Oxygen
  • 27.27% carbon
  • Both of the above
  • None of the above
  1. These have same number of protons in each atom but the neutron number can vary:
  • Isotopes 
  • Molecules 
  • Ions
  • Isobars
  1. The particle that carries a negative electrical charge.
  • Proton
  • Neutron 
  • Nucleus
  • Electron
  1. An atom of carbon contains 6 protons and 6 neutrons, its mass number will be
  • 12
  • 6
  • 18
  • 24
  1.  The centre or core of an atom is called:
  • Orbital 
  • Nucleus 
  • Proton 
  • Neutron 
  1. An element has seven electrons in its valence shell. Its valency is:
  • 7
  • 0
  • 1
  • 8

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