Atoms and Molecules English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

10th Standard

    Reg.No. :
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Science

Time : 00:15:00 Hrs
Total Marks : 15

    Part A

    15 x 1 = 15
  1. Th e volume occupied by 4.4 g of CO2 at S.T.P

    (a)

    22.4 litre

    (b)

    2.24 litre

    (c)

    0.24 litre

    (d)

    0.1 litre

  2. Which of the following represents 1 amu?

    (a)

    Mass of a C – 12 atom

    (b)

    Mass of a hydrogen atom

    (c)

    1/12th of the mass of a C – 12 atom

    (d)

    Mass of O – 16 atom

  3. The volume occupied by 1 mole of a diatomic gas at S.T.P is

    (a)

    11.2 litre

    (b)

    5.6 litre

    (c)

    22.4 litre

    (d)

    44.8 litre

  4. 1 mole of any substance contains __________ molecules

    (a)

    6.023 × 1023

    (b)

    6.023 × 1023

    (c)

    3.0115 × 1023

    (d)

    12.046 × 1023

  5. Atoms of different elements with different atomic numbers, but same mass number are known as _________

    (a)

    isobars

    (b)

    isotopes

    (c)

    isotones

    (d)

    isomers

  6. Identify the 'hetero nuclear tri atomic molecule' among the following.

    (a)

    P4

    (b)

    H2SO4

    (c)

    CO2

    (d)

    O3

  7. Which of the following statement regarding an atom is always correct?

    (a)

    An atom has equal number of electrons and protons

    (b)

    An atom has equal number of electrons and neutrons

    (c)

    An atom has equal number of electrons, protons and neutrons

    (d)

    An atom has equal number of protons and neutrons

  8. The atomic number of an element is 12 and its mass number is 24. The number of electrons, protons and neutrons respectively will be

    (a)

    12, 12, 24

    (b)

    24,12,12

    (c)

    12,12,12

    (d)

    12, 24,12

  9. The relative atomic masses of many elements are not whole number because

    (a)

    they are not determined accurately

    (b)

    they exist as isotopes

    (c)

    due to impurities

    (d)

    atoms ionize

  10. The total number of electrons present in 16 g of methane gas is

    (a)

    96.352 x 1023

    (b)

    48.176 x 1023

    (c)

    6.023 X 1023

    (d)

    30.11 x 1023

  11. The number of particles present in one mole of any substance is equal to

    (a)

    6.023 x 1023

    (b)

    60.23 x 1023

    (c)

    6.023 X 1027

    (d)

    60.23 x 1027

  12. The number of molecules in 16.0 g of oxygen is:

    (a)

    6.023 x 1023

    (b)

    6.023 x 10-23

    (c)

    3.01 X 10-23

    (d)

    3.0115 x 1023

  13. Adding electrons to an atom will result in a (an):

    (a)

    Molecule

    (b)

    Anion

    (c)

    Cation

    (d)

    Salt

  14. The total number of atoms represented by the compound CuSO4. 5H2O is

    (a)

    27

    (b)

    21

    (c)

    5

    (d)

    8

  15. How many molecules are present in one gram of hydrogen?

    (a)

    6.023 x 1023

    (b)

    3.0115 x 1023

    (c)

    2.5 X 1023

    (d)

    1.5 x 1023

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