Atomic Structure – Online MCQs – Physics 10th

1. Consider the species ₁₇Cl³⁵ and ₁₇Cl³⁷ These species have:

the exact number of nucleons

the exact number of protons

the exact mass number

the exact number of neutrons

2. Which one of them are physical properties?

mass and surface area

None of them

volume and density

mass and surface area and volume and density

3. Electrons are bound by a positively charged nucleus with the:

electrostatic force

magnetic force

electrical force

gravitational force

4. An atom usually has:

an equal number of protons as electrons

more number of protons than electrons

equal number of protons as neutrons

a smaller number of protons than electrons

5. Atomic mass (A) of deuterium is:

6. Many essential properties of an isotope depend on its:

atomic number

charge

Both of them

mass

7. Isotopes of an element have:

the same atomic mass but different atomic number

the same atomic number but different numbers of protons

the same atomic number but a different atomic mass

the same atomic mass but different numbers of protons

8. Which atomic particle has a positive charge?

Photon

Neutron

Proton

Electron

9. The atomic number (Z) tells us:

None of them

the number of electrons in that atom

the number of protons in that atom

Both of these

10. The smallest unit of matter is a:

atom

cell

molecule

quark

11. Electron has a:

no charge

negative charge

positive charge

None of them

12. Atomic mass of an element is equal to:

mass of electrons and neutrons

mass of protons and neutrons

mass of protons only

mass of protons and electrons

13. In an atom, the nucleus when compared to the extra-nuclear part, is:

more significant in volume and heavier in mass

smatter in volume and lighter in mass

smatter in volume but heavier in mass

more significant in volume but lighter in mass

14. Isotopes are two or more species of atoms of an element with:

Identical physical a chemical properties

different physical and chemical properties

Identical physical properties but different chemical properties

Identical chemical properties but different physical properties

15. The mass of a neutron is:

slightly lesser than that of a proton

equal to that of a proton

slightly larger than that of a proton

much larger than that of a proton

16. In magnitude, a proton has:

more positive +ve charge that of an electron

an equal positive +ve charge that of an electron

slightly more charge than that of a neutron

Less positive +ve charge that of an electron

17. The neutral atoms of all of the isotopes of the same element have:

different numbers of protons

an exact number of nucleons

exact numbers of neutrons

an exact number of protons

18. The atomic number (Z) of nitrogen is:

19. ₁²H and ₁³H are :

isobars

isotopes

isotones

isochors

20. The symbol denotes the proton number is:

Online MCQs Test | Unit 19 : Atomic Structure | Physics Class 10th | Sindh Board Science Group