Here we are going to provide class 11 Chemistry chapter 3 the atomic structure solved MCQs for Sindh board students that help in their exam.
11 Class Chemistry Chapter 3 Solved MCQs
It can help 1st-year chemistry chapter 3 MCQs for Karachi, Hyderabad, Larkana, and Sukkur Board students in their Sindh Examination.
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1. Properties of waves are
a) Wavelength
b) Wave number
c) Frequency
d) All
Answer: d) All
2. Which one of the following is not the unit of the wave number
a) m-1
b) cm-1
c) mm-2
d) cm
Answer: d) cm
3. The velocity of photon of light is:
a) Equal to square of its amplitude
b) Depends on its source
c) Depends on its way of travelling
d) Independent of its source
Answer: d) Independent of its source
4. The value of Planck’s constant is:
a) 6.62×10-34 J.S
b) 6.62X10-27 J.S
c) 6.62X10-14 J.S
d) 6.62X10-32 J.S
Answer: a) 6.62×10-34 J.S
5. The relation between energy of a photon of light and its frequency was given by:
a) Broglie in his nature of matter
b) Bohr in his model
c) Rutherford in his a-rays scattering experiment
d) Planck in his quantum theory
Answer: d) Planck in his quantum theory
6. On which laws Rutherford’s atomic model was based on:
a) Laws of mass action
b) Laws of motion and gravitation
c) Law of conservation of energy
d) None of the above
Answer: b) Laws of motion and gravitation
7. According to Rutherford’s Model, the revolving electron should not emit the energy continuously.
a) True
b) False
Answer: b) False
8. Rutherford concluded that atoms contain heavy and positively charged parts of the center. And called this center a nucleus.
a) True
b) False
Answer: a) True
9. The wavelength of x-ray emitted from the surface of the metal depends upon:
a) Atomic number of metals
b) Wavelength of x-ray
c) Both of the above
d) None of the above
Answer: a) Atomic number of metals
10. Moseley’s law is the relationship between the __________ of line spectrum of x-ray.
a) Atomic number
b) Frequency
c) Wavelength
d) All of the above
Answer: b) Frequency
11. The atomic number is the number of _________ in the nucleus of an atom.
a) Neutrons
b) Electrons
c) Protons
d) All of the above
Answer: c) Protons
12. The energy levels of H-atom in Bohr model are called:
a) Ground state energy levels
b) Orbits
c) Orbitals
d) Degenerate orbitals
Answer: b) Orbits
13. The value of Bohr radius for 1st orbit of H-atom is:
a) 0.529 x 10-6 cm
b) 0.529 x 10-8 cm
c) 0.529 x 10-19 cm
d) 0.529 x 10-12 cm
Answer: b) 0.529 x 10-8 cm
14. Bohr model of atom explains:
a) Photoelectric effect
b) Stark effect
c) Zeeman effect
d) None
Answer: a) Photoelectric effect
15. According, to the Bohr’s model, the radius of second orbit is:
a) 2 A0
b) 2.1 A0
c) 2.11 x 10-14 m
d) 2.11 x 10-19 m
Answer: b) 2.1 A0
16. When the electron is brought from infinity to the ground state of the hydrogen atom, the energy is:
a) emitted
b) Absorbed
c) Not effected
d) Is influenced by the surrounding
Answer: a) emitted
Conclusion
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