These Structure of Atom MCQs with FREE PDF contains most important Questions and Answers on various topic such as

We have the best collection of Structure of Atom MCQs and answer with FREE PDF. These Structure of Atom MCQs will help you to prepare for any competitive exams like: NEET, AIIMS, JEE Mains, JEE Advance, IIT JEE, JIPMER and other Exams at all levels – you just have to practice regularly.

## Structure of Atom MCQs

**1. Thomson discovered that every substance in this universe is made up of ________ from his experiments.**

a) neutrons

b) protons

c) electrons

d) mass

**Answer: **electrons

**2. When cathode rays strike zinc sulfide coating, what did it create?**

a) bright spot

b) blue light

c) uv rays

d) white light

**Answer: **bright spot

**3. ___________ is the lightest and smallest particles that’s obtained from hydrogen(that is a positive ion).**

a) Electron

b) Proton

c) Neutron

d) Particle

**Answer: **Proton

**4. What’s the mass of neutron in terms of electrons mass?**

a) 1838 times of electron’s mass

b) 1/1838 times of electron’s mass

c) 1832 times of electron’s mass

d) 1/1832 times of electron’s mass

**Answer: **1838 times of electron’s mass

**5. Neutrally charged particles are protons.**

a) True

b) False

**Answer: **False

**6. Which of the following may be an incorrect statement regarding cathode ray discharge tube?**

a) Presence of negative charge in cathode rays

b) The magnetic field deflects these rays

c) It needs high voltage

d) Protons are present in cathode rays

**Answer: **Protons are present in cathode rays

**7. Which of the following condition is suitable for cathode ray discharge tube?**

a) Low pressure, high voltage

b) Low pressure, low voltage

c) High pressure, low voltage

d) High pressure, high voltage

**Answer: **Low pressure, high voltage

**8. If the number of protons and neutrons of an element is 13 and 14 respectively, then what’s the atomic number(Z) and mass number(A)?**

a) 13, 13

b) 13, 27

c) 14, 13

d) 27, 14

**Answer: **13, 27

**9. Which of the following is not an isotope of hydrogen?**

a) protium

b) deuterium

c) tritium

d) helium

**Answer: **helium

**10. Chemical properties of an atom are dependent on a number of electrons in that particular atom.**

a) True

b) False

**Answer: **True

**11. Find out the number of neutrons, protons, and electrons of 17Cl37 respectively.**

a) 20, 20, 17

b) 17, 17, 20

c) 20, 17, 17

d) 17, 17, 17

**Answer: **20, 17, 17

**12. ****Gravitational force = Gm**_{1}**m**_{2}**/r**^{2}**.**

_{1}

_{2}

^{2}

a) True

b) False

**Answer: **True

**13. ****Pick out the isobar of **_{18}**Ar**^{40}**.**

_{18}

^{40}

a) _{12}Mg^{24}

b) _{26}Fe^{58}

c) _{19}K^{40}

d) _{28}Ni^{64}

**Answer: **_{19}K^{40}

**14****. What is t****he absolute charge of a proton?**

a) +1.602176×10^{-27}

b) –1.602176×10^{-19}

c) +1.602176×10^{-19}

d) –1.602176×10^{-27}

**Answer: **–1.602176×10^{-19}

**15. Which of the following models are not the same as Thomson Model of Atom?**

a) plum pudding model

b) watermelon model

c) raisin pudding model

d) nuclear model

**Answer: **nuclear model

**15. ________ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface.**

a) Required

b) Activated

c) Threshold

d) Limiting

**Answer: **Threshold

**16. A metal’s work function is 3.8KJ. Photons strike metal’s surface with an energy of 5.2 KJ. what’s the kinetic energy of the emitted electrons?**

a) 3.8 KJ

b) 5.2 KJ

c) 9 KJ

d) 1.4 KJ

**Answer: **1.4 KJ

**17. When an electron jumps from 3rd orbit to 2nd orbit, which series of spectral lines are obtained?**

a) Balmer

b) Lyman

c) Paschen

d) Brackett

**Answer: **Balmer

**18. ****Find out the wavenumber, when an electron jumps from 2**^{nd}** orbit to 1**^{st}**.**

^{nd}

^{st}

a) 82357.75 cm^{-1}

b) 105,677 cm^{-1}

c) 82257.75 cm^{-1}

d) 109,677 cm^{-1}

**Answer: **82257.75 cm^{-1}

**19. The ultraviolet spectral region is obtained in Balmer series.**

a) True

b) False

**Answer: **False

**20. What’s the wavelength for the visible region in electromagnetic radiation?**

a) 400 – 750 nm

b) 400 – 750 mm

c) 400 – 750 μm

d) 400 – 750 pm

**Answer: **400 – 750 nm

**21. Calculate the frequency of the wave whose wavelength is 10nm.**

a) 2 Hz

b) 3 Hz

c) 1 Hz

d) 4 Hz

**Answer: **3 Hz

**22. ****What is ****the wavenumber of violet color?**

a) 25 x 10^{3} mm^{-1}

b) 25 x 10^{3} m^{-1}

c) 25 x 10^{3} cm^{-1}

d) 25 x 10^{3} nm^{-1}

**Answer: **25 x 10^{3} cm^{-1}

**23. Bohr’s model couldn’t explain Zeeman and stark effect.**

a) False

b) True

**Answer: **True

**24. Bohr’s model could not explain the ability of atoms to form molecules by ______**

a) Attraction

b) Physical bonds

c) Chemical bonds

d) Polarity

**Answer: **Chemical bonds

**25. Calculate the wavelength of a photon that traveled from 5th orbit to 2nd orbit.**

a) 434 nm

b) 456 nm

c) 863 nm

d) 268 nm

**Answer: **434 nm

**26. The energy of a hydrogen atom is positive.**

a) True

b) False

**Answer: **False

**27. ****Which of the following is ****the value for Rydberg constant?**

a) 2.95 x 10^{-18} J

b) -2.95 x 10^{-18} J

c) -2.18 x 10^{-18} J

d) 2.18 x 10^{-18} J

**Answer: **-2.18 x 10^{-18} J

**28. Iω = _________**

a) m_{e}v^{2}r

b) m_{e}vr^{2}

c) m_{e}r

d) m_{e}vr

**Answer: **m_{e}vr

**29. Angular momentum of an electron is quantized.**

a) True

b) False

**Answer: **True

**30. ****The energy of 1**^{st}** orbi****t in a hydrogen atom __________**

^{st}

a) 3.18×10^{–12} J

b) –2.18×10^{–18} J

c) –3.18×10^{–18} J

d) 2.18×10^{–18} J

**Answer: **–2.18×10^{–18} J

**31. As per Heisenberg’s principle of uncertainty, the relation between relative momentum and relative position is __________**

a) independent

b) equal

c) directly proportional

d) inversely proportional

**Answer: **inversely proportional

**32. Δx. Δp ≥ h/4π.**

a) True

b) False

**Answer: **True

**33. ****An object has a mass of 6 kg and velocity of 10 m/s. The speed is measured with 5% a****ccuracy, then find out Δx in m.**

a) 0.12676 x 10^{-34}

b) 0.1566 x 10^{-34}

c) 0.176 x 10^{-34}

d) 0.276 x 10^{-34}

**Answer: **0.176 x 10^{-34}

**34. ****If the kinetic energy of an electron ****is 5J. Find out its wavelength.**

a) 0.313 x 10^{15} m/s

b) 3.013 x 10^{15} m/s

c) 3.310 x 10^{15} m/s

d) 3.313 x 10^{15} m/s

**Answer: **3.313 x 10^{15} m/s

**35. If the uncertainties in position and momentum are equal, then the uncertainty in position is given by ____**

a) √h/4π

b) √h4π

c) √h/4

d) √h/π

**Answer: **√h/4π

**36. ****The uncertainty of a ball is given by 0.5A°. Then calcula****te the uncertainty in momentum.**

a) 2.055 x 10^{-24} kgm/s

b) 1.015 x 10^{-24} kgm/s

c) 1.055 x 10^{-24} kgm/s

d) 1.095 x 10^{-24} kgm/s

**Answer: **1.055 x 10^{-24} kgm/s

**37. ****Mass of a photon is given by 3.313 x 10**^{-34}** kg. Find it’s wavelength.**

^{-34}

a) 0.67A°

b) 0.67nm

c) 0.37A°

d) 1.67A°

**Answer: **0.67A°

**38. ****A ball of mass 0.5kg is moving with velocity 6.626 m/s. What****’s the wavelength of that ball?**

a) 1 x 10^{-34} m

b) 2 x 10^{-34} m

c) 2 x 10^{-32} m

d) 2 x 10^{-3} m

**Answer: **2 x 10^{-34} m

**39. How many electrons can exist with the principal quantum number’s value as 4?**

a) 16

b) 4

c) 32

d) 12

**Answer: **32

**40. No two electrons have the same set of all four quantum numbers.**

a) True

b) False

**Answer: **True

**41. According to the Aufbau’s principle, which of the following orbital should be filled first?**

a) 5d

b) 4p

c) 3p

d) 2s

**Answer: **2s

**42. Which of the following set of quantum numbers is not valid?**

a) n = 5, l = 2, m = 0, s = 1/2

b) n = 1, l = 2, m = 0, s = 1/2

c) n = 5, l = 3, m = 2, s = 1/2

d) n = 5, l = 2, m = 0, s = -1/2

**Answer: **n = 1, l = 2, m = 0, s = 1/2

**43. Total number of nodes for 3d orbital is ________**

a) 3

b) 2

c) 1

d) 0

**Answer: **2

**44. What is the magnetic quantum number of the orbital 2pz?**

a) 1

b) ±1

c) -1

d) 0

**Answer: **0

**45. What is the shape the orbital, whose “l” is 1?**

a) Spherical

b) Dumbbell

c) Double dumbbell

d) Complex

**Answer: **Dumbbell

**46. The principal quantum number describes ____**

a) energy and size of the orbit

b) the shape of the orbital

c) spatial orientation of the orbital

d) the spin of the electron

**Answer: **energy and size of the orbit

### Structure of Atom MCQs PDF Download

Categories: Structure of Atom